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* [PATCH 00/12] Add TOSHIBA TC358764 DSI/LVDS bridge driver
       [not found] <CGME20180528094721eucas1p22b90fd838ce00f029fec7f5241cc06b5@eucas1p2.samsung.com>
@ 2018-05-28  9:47 ` Maciej Purski
       [not found]   ` <CGME20180528094722eucas1p28c087e8b9174e0591bf3cb6526885777@eucas1p2.samsung.com>
                     ` (11 more replies)
  0 siblings, 12 replies; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:47 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

Hi all,

this patchset is a next attempt to add the tc358764 driver.
The previous one can be found here:

https://lists.freedesktop.org/archives/dri-devel/2014-February/053705.html

Back then, TC358764 was added as a panel driver.

The bridge is supposed to be a DSI peripheral. Currently exynos_dsi accepts only panels
as its peripherals. Therefore, some logic in exynos_dsi had to be ammended. That is implemented
in first 4 patches.

Apart from the driver this patchset adds support for BOE HV070WSA-100 panel, which is used by
TC358764 and dts nodes to exynos5250.dtsi and exynos5250-arndale.dtsi.

Best regards,

Maciej Purski

Maciej Purski (12):
  drm/exynos: rename "bridge_node" to "mic_bridge_node"
  drm/exynos: move pm_runtime_get_sync() to exynos_dsi_init()
  drm/exynos: move connector creation to attach callback
  drm/exynos: add non-panel path to exynos_dsi_enable()
  panel/hv070wsa-100: add DT bindings
  drm/panel: add support for BOE HV070WSA-100 panel to simple-panel
  dt-bindings: tc358754: add DT bindings
  drm/bridge: tc358764: Add DSI to LVDS bridge driver
  ARM: dts: exynos5250: add mipi-phy node
  ARM: dts: exynos5250: add DSI node
  ARM: dts: exynos5250-arndale: add display regulators
  ARM: dts: exynos5250-arndale: add dsi and panel nodes

 .../bindings/display/bridge/toshiba,tc358764.txt   |  42 ++
 .../bindings/display/panel/boe,hv070wsa-100.txt    |   7 +
 arch/arm/boot/dts/exynos5250-arndale.dts           |  63 +++
 arch/arm/boot/dts/exynos5250.dtsi                  |  20 +
 drivers/gpu/drm/bridge/Kconfig                     |   7 +
 drivers/gpu/drm/bridge/Makefile                    |   1 +
 drivers/gpu/drm/bridge/tc358764.c                  | 547 +++++++++++++++++++++
 drivers/gpu/drm/exynos/exynos_drm_dsi.c            |  84 ++--
 drivers/gpu/drm/panel/panel-simple.c               |  25 +
 9 files changed, 756 insertions(+), 40 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
 create mode 100644 Documentation/devicetree/bindings/display/panel/boe,hv070wsa-100.txt
 create mode 100644 drivers/gpu/drm/bridge/tc358764.c

-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 01/12] drm/exynos: rename "bridge_node" to "mic_bridge_node"
       [not found]   ` <CGME20180528094722eucas1p28c087e8b9174e0591bf3cb6526885777@eucas1p2.samsung.com>
@ 2018-05-28  9:47     ` Maciej Purski
  0 siblings, 0 replies; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:47 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

When adding support for peripheral out bridges, the "bridge" name
becomes imprecise as it refers to a different device than the
"out_bridge".

Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index eae44fd..9599e6b 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -279,7 +279,7 @@ struct exynos_dsi {
 	struct list_head transfer_list;
 
 	const struct exynos_dsi_driver_data *driver_data;
-	struct device_node *bridge_node;
+	struct device_node *mic_bridge_node;
 };
 
 #define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host)
@@ -1631,7 +1631,7 @@ static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)
 	if (ret < 0)
 		return ret;
 
-	dsi->bridge_node = of_graph_get_remote_node(node, DSI_PORT_IN, 0);
+	dsi->mic_bridge_node = of_graph_get_remote_node(node, DSI_PORT_IN, 0);
 
 	return 0;
 }
@@ -1642,7 +1642,7 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
 	struct drm_encoder *encoder = dev_get_drvdata(dev);
 	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
 	struct drm_device *drm_dev = data;
-	struct drm_bridge *bridge;
+	struct drm_bridge *mic_bridge;
 	int ret;
 
 	drm_encoder_init(drm_dev, encoder, &exynos_dsi_encoder_funcs,
@@ -1661,10 +1661,10 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
 		return ret;
 	}
 
-	if (dsi->bridge_node) {
-		bridge = of_drm_find_bridge(dsi->bridge_node);
-		if (bridge)
-			drm_bridge_attach(encoder, bridge, NULL);
+	if (dsi->mic_bridge_node) {
+		mic_bridge = of_drm_find_bridge(dsi->mic_bridge_node);
+		if (mic_bridge)
+			drm_bridge_attach(encoder, mic_bridge, NULL);
 	}
 
 	return mipi_dsi_host_register(&dsi->dsi_host);
@@ -1783,7 +1783,7 @@ static int exynos_dsi_remove(struct platform_device *pdev)
 {
 	struct exynos_dsi *dsi = platform_get_drvdata(pdev);
 
-	of_node_put(dsi->bridge_node);
+	of_node_put(dsi->mic_bridge_node);
 
 	pm_runtime_disable(&pdev->dev);
 
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 02/12] drm/exynos: move pm_runtime_get_sync() to exynos_dsi_init()
       [not found]   ` <CGME20180528094723eucas1p1776829e0b57d2ec6c4e28be872cf88fc@eucas1p1.samsung.com>
@ 2018-05-28  9:47     ` Maciej Purski
  0 siblings, 0 replies; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:47 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

In order to allow bridge drivers to use DSI transfers in their
pre_enable callbacks, pm_runtime_get_sync() should be performed before
exynos_dsi_enable(). DSIM_STATE_ENABLED flag now should not guard
from calling dsi_host_transfer() before enabling.

Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 9599e6b..94460b0 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1312,6 +1312,7 @@ static int exynos_dsi_init(struct exynos_dsi *dsi)
 {
 	const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
 
+	pm_runtime_get_sync(dsi->dev);
 	exynos_dsi_reset(dsi);
 	exynos_dsi_enable_irq(dsi);
 
@@ -1388,7 +1389,6 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 	ret = drm_panel_prepare(dsi->panel);
 	if (ret < 0) {
 		dsi->state &= ~DSIM_STATE_ENABLED;
-		pm_runtime_put_sync(dsi->dev);
 		return;
 	}
 
@@ -1400,7 +1400,6 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 		dsi->state &= ~DSIM_STATE_ENABLED;
 		exynos_dsi_set_display_enable(dsi, false);
 		drm_panel_unprepare(dsi->panel);
-		pm_runtime_put_sync(dsi->dev);
 		return;
 	}
 
@@ -1566,9 +1565,6 @@ static ssize_t exynos_dsi_host_transfer(struct mipi_dsi_host *host,
 	struct exynos_dsi_transfer xfer;
 	int ret;
 
-	if (!(dsi->state & DSIM_STATE_ENABLED))
-		return -EINVAL;
-
 	if (!(dsi->state & DSIM_STATE_INITIALIZED)) {
 		ret = exynos_dsi_init(dsi);
 		if (ret)
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 03/12] drm/exynos: move connector creation to attach callback
       [not found]   ` <CGME20180528094724eucas1p17a37e06002ed96d97aaca87231f13bbb@eucas1p1.samsung.com>
@ 2018-05-28  9:47     ` Maciej Purski
  0 siblings, 0 replies; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:47 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

The current implementation assumes that the only possible peripheral
device for DSIM is a panel. Using an output bridge should also be
possible.

If an output bridge in available, don't create a new connector.
Instead add bridge to DSIM encdoer in dsi_host_attach().

Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 35 +++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 94460b0..8957faf 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1498,7 +1498,28 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 				  struct mipi_dsi_device *device)
 {
 	struct exynos_dsi *dsi = host_to_dsi(host);
-	struct drm_device *drm = dsi->connector.dev;
+	struct drm_encoder *encoder = &dsi->encoder;
+	struct drm_device *drm = encoder->dev;
+	struct drm_bridge *out_bridge;
+
+	out_bridge  = of_drm_find_bridge(device->dev.of_node);
+	if (out_bridge) {
+		drm_bridge_attach(encoder, out_bridge, NULL);
+	} else {
+		int ret = exynos_dsi_create_connector(encoder);
+
+		if (ret) {
+			DRM_ERROR("failed to create connector ret = %d\n", ret);
+			drm_encoder_cleanup(encoder);
+			return ret;
+		}
+
+		dsi->panel = of_drm_find_panel(device->dev.of_node);
+		if (dsi->panel) {
+			drm_panel_attach(dsi->panel, &dsi->connector);
+			dsi->connector.status = connector_status_connected;
+		}
+	}
 
 	/*
 	 * This is a temporary solution and should be made by more generic way.
@@ -1517,11 +1538,6 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 	dsi->lanes = device->lanes;
 	dsi->format = device->format;
 	dsi->mode_flags = device->mode_flags;
-	dsi->panel = of_drm_find_panel(device->dev.of_node);
-	if (dsi->panel) {
-		drm_panel_attach(dsi->panel, &dsi->connector);
-		dsi->connector.status = connector_status_connected;
-	}
 	exynos_drm_crtc_get_by_type(drm, EXYNOS_DISPLAY_TYPE_LCD)->i80_mode =
 			!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO);
 
@@ -1650,13 +1666,6 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
 	if (ret < 0)
 		return ret;
 
-	ret = exynos_dsi_create_connector(encoder);
-	if (ret) {
-		DRM_ERROR("failed to create connector ret = %d\n", ret);
-		drm_encoder_cleanup(encoder);
-		return ret;
-	}
-
 	if (dsi->mic_bridge_node) {
 		mic_bridge = of_drm_find_bridge(dsi->mic_bridge_node);
 		if (mic_bridge)
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 04/12] drm/exynos: add non-panel path to exynos_dsi_enable()
       [not found]   ` <CGME20180528094725eucas1p2e80e551edb29dd4ab437246f4896d108@eucas1p2.samsung.com>
@ 2018-05-28  9:47     ` Maciej Purski
  0 siblings, 0 replies; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:47 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

As DSIM can now have a bridge connected as a peripheral, it should be
possible to successfully enable exynos_dsi, when there is no panel
provided.

Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 8957faf..7d92e50 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1382,27 +1382,26 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 	if (dsi->state & DSIM_STATE_ENABLED)
 		return;
 
-	pm_runtime_get_sync(dsi->dev);
-
-	dsi->state |= DSIM_STATE_ENABLED;
-
-	ret = drm_panel_prepare(dsi->panel);
-	if (ret < 0) {
-		dsi->state &= ~DSIM_STATE_ENABLED;
-		return;
+	if (dsi->panel) {
+		ret = drm_panel_prepare(dsi->panel);
+		if (ret < 0) {
+			return;
+		}
 	}
 
 	exynos_dsi_set_display_mode(dsi);
 	exynos_dsi_set_display_enable(dsi, true);
 
-	ret = drm_panel_enable(dsi->panel);
-	if (ret < 0) {
-		dsi->state &= ~DSIM_STATE_ENABLED;
-		exynos_dsi_set_display_enable(dsi, false);
-		drm_panel_unprepare(dsi->panel);
-		return;
+	if (dsi->panel) {
+		ret = drm_panel_enable(dsi->panel);
+		if (ret < 0) {
+			exynos_dsi_set_display_enable(dsi, false);
+			drm_panel_unprepare(dsi->panel);
+			return;
+		}
 	}
 
+	dsi->state |= DSIM_STATE_ENABLED;
 	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
 }
 
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 05/12] panel/hv070wsa-100: add DT bindings
       [not found]   ` <CGME20180528094726eucas1p14c9d821881865955a4d8b1735a650c8f@eucas1p1.samsung.com>
@ 2018-05-28  9:47     ` Maciej Purski
  0 siblings, 0 replies; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:47 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

The patch adds bindings to BOE HV070-WSA WSVGA panel.
Bindings are compatible with simple panel bindings.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 .../devicetree/bindings/display/panel/boe,hv070wsa-100.txt         | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/boe,hv070wsa-100.txt

diff --git a/Documentation/devicetree/bindings/display/panel/boe,hv070wsa-100.txt b/Documentation/devicetree/bindings/display/panel/boe,hv070wsa-100.txt
new file mode 100644
index 0000000..bfc20ac
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/boe,hv070wsa-100.txt
@@ -0,0 +1,7 @@
+BOE HV070WSA-100 7.01" WSVGA TFT LCD panel
+
+Required properties:
+- compatible: should be "boe,hv070wsa-100"
+
+This binding is compatible with the simple-panel binding, which is specified
+in simple-panel.txt in this directory.
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 06/12] drm/panel: add support for BOE HV070WSA-100 panel to simple-panel
       [not found]   ` <CGME20180528094727eucas1p272478562b72a95dac2fc1b03be57c514@eucas1p2.samsung.com>
@ 2018-05-28  9:47     ` Maciej Purski
  0 siblings, 0 replies; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:47 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

The patch adds support for BOE HV070WSA-100 WSVGA 7.01 inch panel
in panel-simple driver. The panel is used in Exynos5250-arndale boards.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 drivers/gpu/drm/panel/panel-simple.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index cbf1ab4..d5da58d 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -745,6 +745,28 @@ static const struct panel_desc avic_tm070ddh03 = {
 	},
 };
 
+static const struct drm_display_mode boe_hv070wsa_mode = {
+	.clock = 40800,
+	.hdisplay = 1024,
+	.hsync_start = 1024 + 90,
+	.hsync_end = 1024 + 90 + 90,
+	.htotal = 1024 + 90 + 90 + 90,
+	.vdisplay = 600,
+	.vsync_start = 600 + 3,
+	.vsync_end = 600 + 3 + 4,
+	.vtotal = 600 + 3 + 4 + 3,
+	.vrefresh = 60,
+};
+
+static const struct panel_desc boe_hv070wsa = {
+	.modes = &boe_hv070wsa_mode,
+	.num_modes = 1,
+	.size = {
+		.width = 154,
+		.height = 90,
+	},
+};
+
 static const struct drm_display_mode boe_nv101wxmn51_modes[] = {
 	{
 		.clock = 71900,
@@ -2113,6 +2135,9 @@ static const struct of_device_id platform_of_match[] = {
 		.compatible = "avic,tm070ddh03",
 		.data = &avic_tm070ddh03,
 	}, {
+		.compatible = "boe,hv070wsa-100",
+		.data = &boe_hv070wsa
+	}, {
 		.compatible = "boe,nv101wxmn51",
 		.data = &boe_nv101wxmn51,
 	}, {
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 07/12] dt-bindings: tc358754: add DT bindings
       [not found]   ` <CGME20180528094727eucas1p153b8116120cd2195b15b74776f171cbe@eucas1p1.samsung.com>
@ 2018-05-28  9:47     ` Maciej Purski
  2018-05-28 10:18       ` Laurent Pinchart
  0 siblings, 1 reply; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:47 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

The patch adds bindings to Toshiba DSI/LVDS bridge TC358764.
Bindings describe power supplies, reset gpio and video interfaces.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 .../bindings/display/bridge/toshiba,tc358764.txt   | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt

diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
new file mode 100644
index 0000000..d09bdc2
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
@@ -0,0 +1,42 @@
+TC358764 MIPI-DSI to LVDS panel bridge
+
+Required properties:
+  - compatible: "toshiba,tc358764"
+  - reg: the virtual channel number of a DSI peripheral
+  - vddc-supply: core voltage supply
+  - vddio-supply: I/O voltage supply
+  - vddmipi-supply: MIPI voltage supply
+  - vddlvds133-supply: LVDS1 3.3V voltage supply
+  - vddlvds112-supply: LVDS1 1.2V voltage supply
+  - reset-gpios: a GPIO spec for the reset pin
+
+The device node can contain zero to two 'port' child nodes, each with one
+child
+'endpoint' node, according to the bindings defined in [1].
+The following are properties specific to those nodes.
+
+port:
+  - reg: (required) can be 0 for DSI port or 1 for LVDS port;
+
+[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Example:
+
+	bridge@0 {
+		reg = <0>;
+		compatible = "toshiba,tc358764";
+		vddc-supply = <&vcc_1v2_reg>;
+		vddio-supply = <&vcc_1v8_reg>;
+		vddmipi-supply = <&vcc_1v2_reg>;
+		vddlvds133-supply = <&vcc_3v3_reg>;
+		vddlvds112-supply = <&vcc_1v2_reg>;
+		reset-gpios = <&gpd1 6 GPIO_ACTIVE_LOW>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		port@1 {
+			reg = <1>;
+			lvds_ep: endpoint {
+				remote-endpoint = <&panel_ep>;
+			};
+		};
+	};
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 08/12] drm/bridge: tc358764: Add DSI to LVDS bridge driver
       [not found]   ` <CGME20180528094728eucas1p128e8a44fa6c3bcb29d056a8191c039af@eucas1p1.samsung.com>
@ 2018-05-28  9:47     ` Maciej Purski
  2018-05-28 16:24       ` Randy Dunlap
  2018-05-30  7:45       ` kbuild test robot
  0 siblings, 2 replies; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:47 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

Add a drm_bridge driver for the Toshiba TC358764 DSI to LVDS bridge.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 drivers/gpu/drm/bridge/Kconfig    |   7 +
 drivers/gpu/drm/bridge/Makefile   |   1 +
 drivers/gpu/drm/bridge/tc358764.c | 547 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 555 insertions(+)
 create mode 100644 drivers/gpu/drm/bridge/tc358764.c

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index fa2c799..58e19af 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -110,6 +110,13 @@ config DRM_THINE_THC63LVD1024
 	---help---
 	  Thine THC63LVD1024 LVDS/parallel converter driver.
 
+config DRM_TOSHIBA_TC358764
+	tristate "TC358764 DSI/LVDS bridge"
+	depends on DRM && DRM_PANEL
+	depends on OF
+	select DRM_MIPI_DSI
+	select VIDEOMODE_HELPERS
+
 config DRM_TOSHIBA_TC358767
 	tristate "Toshiba TC358767 eDP bridge"
 	depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 35f88d4..bf7c0ce 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o
 obj-$(CONFIG_DRM_SII902X) += sii902x.o
 obj-$(CONFIG_DRM_SII9234) += sii9234.o
 obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
+obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
 obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
 obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
 obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
diff --git a/drivers/gpu/drm/bridge/tc358764.c b/drivers/gpu/drm/bridge/tc358764.c
new file mode 100644
index 0000000..0bd520a
--- /dev/null
+++ b/drivers/gpu/drm/bridge/tc358764.c
@@ -0,0 +1,547 @@
+/*
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd
+ *
+ * Authors:
+ *	Andrzej Hajda <a.hajda@samsung.com>
+ *	Maciej Purski <m.purski@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.
+ *
+ */
+
+#include <drm/drm_atomic_helper.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+
+#include <linux/gpio/consumer.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#define FLD_MASK(start, end)    (((1 << ((start) - (end) + 1)) - 1) << (end))
+#define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
+
+/* PPI layer registers */
+#define PPI_STARTPPI		0x0104 /* START control bit */
+#define PPI_LPTXTIMECNT		0x0114 /* LPTX timing signal */
+#define PPI_LANEENABLE		0x0134 /* Enables each lane */
+#define PPI_TX_RX_TA		0x013C /* BTA timing parameters */
+#define PPI_D0S_CLRSIPOCOUNT	0x0164 /* Assertion timer for Lane 0 */
+#define PPI_D1S_CLRSIPOCOUNT	0x0168 /* Assertion timer for Lane 1 */
+#define PPI_D2S_CLRSIPOCOUNT	0x016C /* Assertion timer for Lane 2 */
+#define PPI_D3S_CLRSIPOCOUNT	0x0170 /* Assertion timer for Lane 3 */
+#define PPI_START_FUNCTION	1
+
+/* DSI layer registers */
+#define DSI_STARTDSI		0x0204 /* START control bit of DSI-TX */
+#define DSI_LANEENABLE		0x0210 /* Enables each lane */
+#define DSI_RX_START		1
+
+/* Video path registers */
+#define VP_CTRL			0x0450 /* Video Path Control */
+#define VP_CTRL_MSF(v)		FLD_VAL(v, 0, 0) /* Magic square in RGB666 */
+#define VP_CTRL_VTGEN(v)	FLD_VAL(v, 4, 4) /* Use chip clock for timing */
+#define VP_CTRL_EVTMODE(v)	FLD_VAL(v, 5, 5) /* Event mode */
+#define VP_CTRL_RGB888(v)	FLD_VAL(v, 8, 8) /* RGB888 mode */
+#define VP_CTRL_VSDELAY(v)	FLD_VAL(v, 31, 20) /* VSYNC delay */
+#define VP_CTRL_HSPOL		BIT(17) /* Polarity of HSYNC signal */
+#define VP_CTRL_DEPOL		BIT(18) /* Polarity of DE signal */
+#define VP_CTRL_VSPOL		BIT(19) /* Polarity of VSYNC signal */
+#define VP_HTIM1		0x0454 /* Horizontal Timing Control 1 */
+#define VP_HTIM1_HBP(v)		FLD_VAL(v, 24, 16)
+#define VP_HTIM1_HSYNC(v)	FLD_VAL(v, 8, 0)
+#define VP_HTIM2		0x0458 /* Horizontal Timing Control 2 */
+#define VP_HTIM2_HFP(v)		FLD_VAL(v, 24, 16)
+#define VP_HTIM2_HACT(v)	FLD_VAL(v, 10, 0)
+#define VP_VTIM1		0x045C /* Vertical Timing Control 1 */
+#define VP_VTIM1_VBP(v)		FLD_VAL(v, 23, 16)
+#define VP_VTIM1_VSYNC(v)	FLD_VAL(v, 7, 0)
+#define VP_VTIM2		0x0460 /* Vertical Timing Control 2 */
+#define VP_VTIM2_VFP(v)		FLD_VAL(v, 23, 16)
+#define VP_VTIM2_VACT(v)	FLD_VAL(v, 10, 0)
+#define VP_VFUEN		0x0464 /* Video Frame Timing Update Enable */
+
+/* LVDS registers */
+#define LV_MX0003		0x0480 /* Mux input bit 0 to 3 */
+#define LV_MX0407		0x0484 /* Mux input bit 4 to 7 */
+#define LV_MX0811		0x0488 /* Mux input bit 8 to 11 */
+#define LV_MX1215		0x048C /* Mux input bit 12 to 15 */
+#define LV_MX1619		0x0490 /* Mux input bit 16 to 19 */
+#define LV_MX2023		0x0494 /* Mux input bit 20 to 23 */
+#define LV_MX2427		0x0498 /* Mux input bit 24 to 27 */
+#define LV_MX(b0, b1, b2, b3)	(FLD_VAL(b0, 4, 0) | FLD_VAL(b1, 12, 8) | \
+				FLD_VAL(b2, 20, 16) | FLD_VAL(b3, 28, 24))
+
+/* Input bit numbers used in mux registers */
+enum {
+	LVI_R0,
+	LVI_R1,
+	LVI_R2,
+	LVI_R3,
+	LVI_R4,
+	LVI_R5,
+	LVI_R6,
+	LVI_R7,
+	LVI_G0,
+	LVI_G1,
+	LVI_G2,
+	LVI_G3,
+	LVI_G4,
+	LVI_G5,
+	LVI_G6,
+	LVI_G7,
+	LVI_B0,
+	LVI_B1,
+	LVI_B2,
+	LVI_B3,
+	LVI_B4,
+	LVI_B5,
+	LVI_B6,
+	LVI_B7,
+	LVI_HS,
+	LVI_VS,
+	LVI_DE,
+	LVI_L0
+};
+
+#define LV_CFG			0x049C /* LVDS Configuration */
+#define LV_PHY0			0x04A0 /* LVDS PHY 0 */
+#define LV_PHY0_RST(v)		FLD_VAL(v, 22, 22) /* PHY reset */
+#define LV_PHY0_IS(v)		FLD_VAL(v, 15, 14)
+#define LV_PHY0_ND(v)		FLD_VAL(v, 4, 0) /* Frequency range select */
+#define LV_PHY0_PRBS_ON(v)	FLD_VAL(v, 20, 16) /* Clock/Data Flag pins */
+
+/* System registers */
+#define SYS_RST			0x0504 /* System Reset */
+#define SYS_ID			0x0580 /* System ID */
+
+#define SYS_RST_I2CS		BIT(0) /* Reset I2C-Slave controller */
+#define SYS_RST_I2CM		BIT(1) /* Reset I2C-Master controller */
+#define SYS_RST_LCD		BIT(2) /* Reset LCD controller */
+#define SYS_RST_BM		BIT(3) /* Reset Bus Management controller */
+#define SYS_RST_DSIRX		BIT(4) /* Reset DSI-RX and App controller */
+#define SYS_RST_REG		BIT(5) /* Reset Register module */
+
+#define LPX_PERIOD		2
+#define TTA_SURE		3
+#define TTA_GET			0x20000
+
+/* Lane enable PPI and DSI register bits */
+#define LANEENABLE_CLEN		BIT(0)
+#define LANEENABLE_L0EN		BIT(1)
+#define LANEENABLE_L1EN		BIT(2)
+#define LANEENABLE_L2EN		BIT(3)
+#define LANEENABLE_L3EN		BIT(4)
+
+/* LVCFG fields */
+#define LV_CFG_LVEN		BIT(0)
+#define LV_CFG_LVDLINK		BIT(1)
+#define LV_CFG_CLKPOL1		BIT(2)
+#define LV_CFG_CLKPOL2		BIT(3)
+
+
+static const char * const tc358764_supplies[] = {
+	"vddc", "vddio", "vddmipi", "vddlvds133", "vddlvds112"
+};
+
+struct tc358764 {
+	struct device *dev;
+	struct drm_bridge bridge;
+	struct drm_connector connector;
+	struct regulator_bulk_data supplies[ARRAY_SIZE(tc358764_supplies)];
+	struct gpio_desc *gpio_reset;
+
+	struct drm_panel *panel;
+};
+
+int tc358764_read(struct tc358764 *ctx, u16 addr, u32 *val)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+	const struct mipi_dsi_host_ops *ops = dsi->host->ops;
+	struct mipi_dsi_msg msg = {
+		.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM,
+		.channel = dsi->channel,
+		.flags = MIPI_DSI_MSG_USE_LPM,
+		.tx_buf = &addr,
+		.tx_len = 2,
+		.rx_buf = val,
+		.rx_len = 4
+	};
+	ssize_t ret;
+
+	if (!ops || !ops->transfer)
+		return -EINVAL;
+
+	addr = cpu_to_le16(addr);
+
+	ret = ops->transfer(dsi->host, &msg);
+	if (ret >= 0)
+		*val = le32_to_cpu(*val);
+
+	dev_dbg(ctx->dev, "read: %d, addr: %d\n", addr, *val);
+
+	return ret;
+}
+
+int tc358764_write(struct tc358764 *ctx, u16 addr, u32 val)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+	const struct mipi_dsi_host_ops *ops = dsi->host->ops;
+	u8 data[6];
+	int ret;
+	struct mipi_dsi_msg msg = {
+		.type = MIPI_DSI_GENERIC_LONG_WRITE,
+		.channel = dsi->channel,
+		.flags = MIPI_DSI_MSG_USE_LPM | MIPI_DSI_MSG_REQ_ACK,
+		.tx_buf = data,
+		.tx_len = 6
+	};
+
+	if (!ops || !ops->transfer)
+		return -EINVAL;
+
+	data[0] = addr;
+	data[1] = addr >> 8;
+	data[2] = val;
+	data[3] = val >> 8;
+	data[4] = val >> 16;
+	data[5] = val >> 24;
+
+	ret = ops->transfer(dsi->host, &msg);
+
+	return ret;
+}
+
+static inline struct tc358764 *bridge_to_tc358764(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct tc358764, bridge);
+}
+
+static inline
+struct tc358764 *connector_to_tc358764(struct drm_connector *connector)
+{
+	return container_of(connector, struct tc358764, connector);
+}
+
+static int tc358764_init(struct tc358764 *ctx)
+{
+	u32 v = 0;
+
+	tc358764_read(ctx, SYS_ID, &v);
+	dev_info(ctx->dev, "ID: %#x\n", v);
+
+	/* configure PPI counters */
+	tc358764_write(ctx, PPI_TX_RX_TA, TTA_GET | TTA_SURE);
+	tc358764_write(ctx, PPI_LPTXTIMECNT, LPX_PERIOD);
+	tc358764_write(ctx, PPI_D0S_CLRSIPOCOUNT, 5);
+	tc358764_write(ctx, PPI_D1S_CLRSIPOCOUNT, 5);
+	tc358764_write(ctx, PPI_D2S_CLRSIPOCOUNT, 5);
+	tc358764_write(ctx, PPI_D3S_CLRSIPOCOUNT, 5);
+
+	/* enable four data lanes and clock lane */
+	tc358764_write(ctx, PPI_LANEENABLE, LANEENABLE_L3EN | LANEENABLE_L2EN |
+		       LANEENABLE_L1EN | LANEENABLE_L0EN | LANEENABLE_CLEN);
+	tc358764_write(ctx, DSI_LANEENABLE, LANEENABLE_L3EN | LANEENABLE_L2EN |
+		       LANEENABLE_L1EN | LANEENABLE_L0EN | LANEENABLE_CLEN);
+
+	/* start */
+	tc358764_write(ctx, PPI_STARTPPI, PPI_START_FUNCTION);
+	tc358764_write(ctx, DSI_STARTDSI, DSI_RX_START);
+
+	/* configure video path */
+	tc358764_write(ctx, VP_CTRL, VP_CTRL_VSDELAY(15) | VP_CTRL_RGB888(1) |
+		       VP_CTRL_EVTMODE(1) | VP_CTRL_HSPOL | VP_CTRL_VSPOL);
+
+	/* reset PHY */
+	tc358764_write(ctx, LV_PHY0, LV_PHY0_RST(1) |
+		       LV_PHY0_PRBS_ON(4) | LV_PHY0_IS(2) | LV_PHY0_ND(6));
+	tc358764_write(ctx, LV_PHY0, LV_PHY0_PRBS_ON(4) | LV_PHY0_IS(2) | LV_PHY0_ND(6));
+
+	/* reset bridge */
+	tc358764_write(ctx, SYS_RST, SYS_RST_LCD);
+
+	/* set bit order */
+	tc358764_write(ctx, LV_MX0003, LV_MX(LVI_R0, LVI_R1, LVI_R2, LVI_R3));
+	tc358764_write(ctx, LV_MX0407, LV_MX(LVI_R4, LVI_R7, LVI_R5, LVI_G0));
+	tc358764_write(ctx, LV_MX0811, LV_MX(LVI_G1, LVI_G2, LVI_G6, LVI_G7));
+	tc358764_write(ctx, LV_MX1215, LV_MX(LVI_G3, LVI_G4, LVI_G5, LVI_B0));
+	tc358764_write(ctx, LV_MX1619, LV_MX(LVI_B6, LVI_B7, LVI_B1, LVI_B2));
+	tc358764_write(ctx, LV_MX2023, LV_MX(LVI_B3, LVI_B4, LVI_B5, LVI_L0));
+	tc358764_write(ctx, LV_MX2427, LV_MX(LVI_HS, LVI_VS, LVI_DE, LVI_R6));
+	tc358764_write(ctx, LV_CFG, LV_CFG_CLKPOL2 | LV_CFG_CLKPOL1 |
+		       LV_CFG_LVEN);
+
+	return 0;
+}
+
+static void tc358764_reset(struct tc358764 *ctx)
+{
+	msleep(20);
+	gpiod_set_value(ctx->gpio_reset, 0);
+	msleep(20);
+	gpiod_set_value(ctx->gpio_reset, 1);
+	msleep(40);
+}
+
+static void tc358764_poweroff(struct tc358764 *ctx)
+{
+	int ret;
+
+	tc358764_reset(ctx);
+
+	drm_panel_disable(ctx->panel);
+	msleep(40);
+
+	ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0)
+		dev_err(ctx->dev, "error disabling regulators (%d)\n", ret);
+}
+
+static int tc358764_get_modes(struct drm_connector *connector)
+{
+	struct tc358764 *ctx = connector_to_tc358764(connector);
+
+	if (ctx->panel && ctx->panel->funcs && ctx->panel->funcs->get_modes)
+		return ctx->panel->funcs->get_modes(ctx->panel);
+
+	return 0;
+}
+
+static const
+struct drm_connector_helper_funcs tc358764_connector_helper_funcs = {
+	.get_modes = tc358764_get_modes,
+};
+
+static const struct drm_connector_funcs tc358764_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static void tc358764_disable(struct drm_bridge *bridge)
+{
+	struct tc358764 *ctx = bridge_to_tc358764(bridge);
+
+	tc358764_poweroff(ctx);
+}
+
+static void tc358764_pre_enable(struct drm_bridge *bridge)
+{
+	struct tc358764 *ctx = bridge_to_tc358764(bridge);
+	int ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies),
+					ctx->supplies);
+	if (ret < 0)
+		dev_err(ctx->dev, "error enabling regulators (%d)\n", ret);
+
+	tc358764_reset(ctx);
+	tc358764_init(ctx);
+}
+
+static void tc358764_enable(struct drm_bridge *bridge)
+{
+	struct tc358764 *ctx = bridge_to_tc358764(bridge);
+	int ret;
+
+	drm_panel_prepare(ctx->panel);
+
+	ret = drm_panel_enable(ctx->panel);
+	if (ret < 0)
+		pr_err("panel enable failed\n");
+
+	msleep(40);
+}
+
+static int tc358764_attach(struct drm_bridge *bridge)
+{
+	struct tc358764 *ctx = bridge_to_tc358764(bridge);
+	struct drm_device *drm = bridge->dev;
+	int ret;
+
+	if (!bridge->encoder) {
+		DRM_ERROR("Encoder not found\n");
+		return -ENODEV;
+	}
+
+	ctx->connector.polled = DRM_CONNECTOR_POLL_HPD;
+	ret = drm_connector_init(drm, &ctx->connector,
+				 &tc358764_connector_funcs,
+				 DRM_MODE_CONNECTOR_LVDS);
+	if (ret) {
+		DRM_ERROR("Failed to initialize connector\n");
+		return ret;
+	}
+
+	drm_connector_helper_add(&ctx->connector,
+				 &tc358764_connector_helper_funcs);
+
+	drm_mode_connector_attach_encoder(&ctx->connector, bridge->encoder);
+
+	if (ctx->panel)
+		drm_panel_attach(ctx->panel, &ctx->connector);
+
+	drm_atomic_helper_connector_reset(&ctx->connector);
+	drm_connector_register(&ctx->connector);
+
+	return 0;
+}
+
+static const struct drm_bridge_funcs tc358764_bridge_funcs = {
+	.disable = tc358764_disable,
+	.enable = tc358764_enable,
+	.pre_enable = tc358764_pre_enable,
+	.attach = tc358764_attach,
+};
+
+static struct device_node *tc358764_of_find_panel_node(struct device *dev)
+{
+	struct device_node *np, *ep;
+
+	ep = of_graph_get_endpoint_by_regs(dev->of_node, 1, 0);
+	if (!ep) {
+		pr_err("faile to get endpoint\n");
+		return NULL;
+	}
+
+	np = of_graph_get_remote_port_parent(ep);
+
+	return np;
+}
+
+static int tc358764_parse_dt(struct tc358764 *ctx)
+{
+	struct device *dev = ctx->dev;
+	struct device_node *np = dev->of_node;
+	struct device_node *lvds;
+
+	ctx->gpio_reset = devm_gpiod_get_from_of_node(dev, np, "reset", 0,
+						      GPIOD_OUT_LOW,
+						      "tc358764-reset");
+	if (IS_ERR(ctx->gpio_reset)) {
+		dev_err(dev, "no reset GPIO pin provided\n");
+		return PTR_ERR(ctx->gpio_reset);
+	}
+
+	lvds = tc358764_of_find_panel_node(ctx->dev);
+	if (!lvds) {
+		dev_err(dev, "cannot find panel node\n");
+		return -EINVAL;
+	}
+
+	ctx->panel = of_drm_find_panel(lvds);
+	if (!ctx->panel) {
+		dev_err(dev, "panel not registered\n");
+		return -EPROBE_DEFER;
+	}
+
+	return 0;
+}
+
+static int tc358764_configure_regulators(struct tc358764 *ctx)
+{
+	int i, ret;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->supplies); ++i)
+		ctx->supplies[i].supply = tc358764_supplies[i];
+
+	ret = devm_regulator_bulk_get(ctx->dev, ARRAY_SIZE(ctx->supplies),
+				      ctx->supplies);
+	if (ret < 0)
+		dev_err(ctx->dev, "failed to get regulators: %d\n", ret);
+
+	return ret;
+}
+
+static int tc358764_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct tc358764 *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(struct tc358764), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	ctx->dev = dev;
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST
+		| MIPI_DSI_MODE_VIDEO_AUTO_VERT;
+
+	ret = tc358764_parse_dt(ctx);
+	if (ret < 0)
+		return ret;
+
+	ret = tc358764_configure_regulators(ctx);
+	if (ret < 0)
+		return ret;
+
+	ctx->bridge.funcs = &tc358764_bridge_funcs;
+	ctx->bridge.of_node = dev->of_node;
+
+	drm_bridge_add(&ctx->bridge);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		drm_bridge_remove(&ctx->bridge);
+		dev_err(dev, "failed to attach dsi\n");
+	}
+
+	return ret;
+}
+
+static int tc358764_remove(struct mipi_dsi_device *dsi)
+{
+	struct tc358764 *ctx = mipi_dsi_get_drvdata(dsi);
+
+	tc358764_poweroff(ctx);
+
+	mipi_dsi_detach(dsi);
+	drm_bridge_remove(&ctx->bridge);
+
+	return 0;
+}
+
+static const struct of_device_id tc358764_of_match[] = {
+	{ .compatible = "toshiba,tc358764" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tc358764_of_match);
+
+static struct mipi_dsi_driver tc358764_driver = {
+	.probe = tc358764_probe,
+	.remove = tc358764_remove,
+	.driver = {
+		.name = "tc358764",
+		.owner = THIS_MODULE,
+		.of_match_table = tc358764_of_match,
+	},
+};
+module_mipi_dsi_driver(tc358764_driver);
+
+MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
+MODULE_AUTHOR("Maciej Purski <m.purski@samsung.com>");
+MODULE_DESCRIPTION("MIPI-DSI based Driver for TC358764 DSI/LVDS Bridge");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 09/12] ARM: dts: exynos5250: add mipi-phy node
       [not found]   ` <CGME20180528094729eucas1p1cc26ea191a4ee1ba9daa06fae93037bf@eucas1p1.samsung.com>
@ 2018-05-28  9:47     ` Maciej Purski
  2018-05-28 16:24       ` Krzysztof Kozlowski
  0 siblings, 1 reply; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:47 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

The patch adds phy node, required by MIPI devices.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 arch/arm/boot/dts/exynos5250.dtsi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi
index 2daf505..a63b655 100644
--- a/arch/arm/boot/dts/exynos5250.dtsi
+++ b/arch/arm/boot/dts/exynos5250.dtsi
@@ -733,6 +733,12 @@
 			#phy-cells = <0>;
 		};
 
+		mipi_phy: video-phy@10040710 {
+			compatible = "samsung,s5pv210-mipi-video-phy";
+			#phy-cells = <1>;
+			syscon = <&pmu_system_controller>;
+		};
+
 		adc: adc@12d10000 {
 			compatible = "samsung,exynos-adc-v1";
 			reg = <0x12D10000 0x100>;
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 10/12] ARM: dts: exynos5250: add DSI node
       [not found]   ` <CGME20180528095444eucas1p222e4054b8fb8997258182e501f37a10b@eucas1p2.samsung.com>
@ 2018-05-28  9:54     ` Maciej Purski
  2018-05-28 16:36       ` Krzysztof Kozlowski
  0 siblings, 1 reply; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:54 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

The patch adds common part of DSI node for Exynos5250 platforms.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 arch/arm/boot/dts/exynos5250.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi
index a63b655..7403b96 100644
--- a/arch/arm/boot/dts/exynos5250.dtsi
+++ b/arch/arm/boot/dts/exynos5250.dtsi
@@ -739,6 +739,20 @@
 			syscon = <&pmu_system_controller>;
 		};
 
+		dsi_0: dsi@14500000 {
+			compatible = "samsung,exynos4210-mipi-dsi";
+			reg = <0x14500000 0x10000>;
+			interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>;
+			samsung,power-domain = <&pd_disp1>;
+			phys = <&mipi_phy 3>;
+			phy-names = "dsim";
+			clocks = <&clock CLK_DSIM0>, <&clock CLK_SCLK_MIPI1>;
+			clock-names = "bus_clk", "sclk_mipi";
+			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
 		adc: adc@12d10000 {
 			compatible = "samsung,exynos-adc-v1";
 			reg = <0x12D10000 0x100>;
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 11/12] ARM: dts: exynos5250-arndale: add display regulators
       [not found]   ` <CGME20180528095523eucas1p1039e1b62aaef415b66d6f62e86dbef93@eucas1p1.samsung.com>
@ 2018-05-28  9:55     ` Maciej Purski
  0 siblings, 0 replies; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:55 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

The patch adds fixed regulators used by DSI/LVDS bridge
and panel. Regulators are named according to schematics.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 arch/arm/boot/dts/exynos5250-arndale.dts | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5250-arndale.dts b/arch/arm/boot/dts/exynos5250-arndale.dts
index 7a8a5c5..80221fa 100644
--- a/arch/arm/boot/dts/exynos5250-arndale.dts
+++ b/arch/arm/boot/dts/exynos5250-arndale.dts
@@ -97,6 +97,30 @@
 			reg = <2>;
 			regulator-name = "hdmi-en";
 		};
+
+		vcc_1v2_reg: regulator@3 {
+			compatible = "regulator-fixed";
+			reg = <3>;
+			regulator-name = "VCC_1V2";
+			regulator-min-microvolt = <1200000>;
+			regulator-max-microvolt = <1200000>;
+		};
+
+		vcc_1v8_reg: regulator@4 {
+			compatible = "regulator-fixed";
+			reg = <4>;
+			regulator-name = "VCC_1V8";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+		};
+
+		vcc_3v3_reg: regulator@5 {
+			compatible = "regulator-fixed";
+			reg = <5>;
+			regulator-name = "VCC_3V3";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
 	};
 
 	fixed-rate-clocks {
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* [PATCH 12/12] ARM: dts: exynos5250-arndale: add dsi and panel nodes
       [not found]   ` <CGME20180528095555eucas1p2fb61f362a3aa2d0082b8c4001b17f176@eucas1p2.samsung.com>
@ 2018-05-28  9:55     ` Maciej Purski
  2018-05-28 16:41       ` Krzysztof Kozlowski
  0 siblings, 1 reply; 24+ messages in thread
From: Maciej Purski @ 2018-05-28  9:55 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz,
	Maciej Purski

The patch adds bridge and panel nodes.
It adds also DSI properties specific for arndale board.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Maciej Purski <m.purski@samsung.com>
---
 arch/arm/boot/dts/exynos5250-arndale.dts | 39 ++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5250-arndale.dts b/arch/arm/boot/dts/exynos5250-arndale.dts
index 80221fa..6f0b1c4 100644
--- a/arch/arm/boot/dts/exynos5250-arndale.dts
+++ b/arch/arm/boot/dts/exynos5250-arndale.dts
@@ -71,6 +71,17 @@
 		};
 	};
 
+	panel: panel {
+		compatible = "boe,hv070wsa-100";
+		power-supply = <&vcc_3v3_reg>;
+		enable-gpios = <&gpd1 3 GPIO_ACTIVE_HIGH>;
+		port {
+			panel_ep: endpoint {
+				remote-endpoint = <&bridge_out_ep>;
+			};
+		};
+	};
+
 	regulators {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -476,6 +487,34 @@
 	};
 };
 
+&dsi_0 {
+	vddcore-supply = <&ldo8_reg>;
+	vddio-supply = <&ldo10_reg>;
+	samsung,pll-clock-frequency = <24000000>;
+	samsung,burst-clock-frequency = <320000000>;
+	samsung,esc-clock-frequency = <10000000>;
+	status = "okay";
+
+	bridge@0 {
+		reg = <0>;
+		compatible = "toshiba,tc358764";
+		vddc-supply = <&vcc_1v2_reg>;
+		vddio-supply = <&vcc_1v8_reg>;
+		vddmipi-supply = <&vcc_1v2_reg>;
+		vddlvds133-supply = <&vcc_3v3_reg>;
+		vddlvds112-supply = <&vcc_1v2_reg>;
+		reset-gpios = <&gpd1 6 GPIO_ACTIVE_LOW>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+		port@1 {
+			reg = <1>;
+			bridge_out_ep: endpoint {
+				remote-endpoint = <&panel_ep>;
+			};
+		};
+	};
+};
+
 &i2c_2 {
 	status = "okay";
 	/* used by HDMI DDC */
-- 
2.7.4

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 07/12] dt-bindings: tc358754: add DT bindings
  2018-05-28  9:47     ` [PATCH 07/12] dt-bindings: tc358754: add DT bindings Maciej Purski
@ 2018-05-28 10:18       ` Laurent Pinchart
  2018-05-30  9:59         ` Andrzej Hajda
  0 siblings, 1 reply; 24+ messages in thread
From: Laurent Pinchart @ 2018-05-28 10:18 UTC (permalink / raw)
  To: Maciej Purski
  Cc: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree,
	dri-devel, David Airlie, Rob Herring, Mark Rutland,
	Thierry Reding, Kukjin Kim, Krzysztof Kozlowski, Archit Taneja,
	Andrzej Hajda, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz

Hi Maciej,

Thank you for the patch.

On Monday, 28 May 2018 12:47:11 EEST Maciej Purski wrote:
> The patch adds bindings to Toshiba DSI/LVDS bridge TC358764.
> Bindings describe power supplies, reset gpio and video interfaces.
> 
> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
> Signed-off-by: Maciej Purski <m.purski@samsung.com>
> ---
>  .../bindings/display/bridge/toshiba,tc358764.txt   | 42 +++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> 
> diff --git
> a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt new
> file mode 100644
> index 0000000..d09bdc2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> @@ -0,0 +1,42 @@
> +TC358764 MIPI-DSI to LVDS panel bridge
> +
> +Required properties:
> +  - compatible: "toshiba,tc358764"
> +  - reg: the virtual channel number of a DSI peripheral
> +  - vddc-supply: core voltage supply
> +  - vddio-supply: I/O voltage supply
> +  - vddmipi-supply: MIPI voltage supply
> +  - vddlvds133-supply: LVDS1 3.3V voltage supply
> +  - vddlvds112-supply: LVDS1 1.2V voltage supply

That's a lot of power supplies. Could some of them be merged together ? See 
https://patchwork.freedesktop.org/patch/216058/ for an earlier discussion on 
the same subject.

> +  - reset-gpios: a GPIO spec for the reset pin
> +
> +The device node can contain zero to two 'port' child nodes, each with one
> +child
> +'endpoint' node, according to the bindings defined in [1].
> +The following are properties specific to those nodes.
> +
> +port:
> +  - reg: (required) can be 0 for DSI port or 1 for LVDS port;

This seems pretty vague to me. It could be read as meaning that ports are 
completely optional, and that the port number you list can be used, but that 
something else could be used to.

Let's make the port nodes mandatory. I propose the following.

Required nodes:

The TC358764 has DSI and LVDS ports whose connections are described using the 
OF graph bindings defined in Documentation/devicetree/bindings/graph.txt. The 
device node must contain one 'port' child node per DSI and LVDS port. The port 
nodes are numbered as follows.

  Port                  Number
-------------------------------------------------------------------
  DSI Input             0
  LVDS Output           1

Each port node must contain endpoint nodes describing the hardware 
connections.

> +[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
> +
> +Example:
> +
> +	bridge@0 {
> +		reg = <0>;
> +		compatible = "toshiba,tc358764";
> +		vddc-supply = <&vcc_1v2_reg>;
> +		vddio-supply = <&vcc_1v8_reg>;
> +		vddmipi-supply = <&vcc_1v2_reg>;
> +		vddlvds133-supply = <&vcc_3v3_reg>;
> +		vddlvds112-supply = <&vcc_1v2_reg>;
> +		reset-gpios = <&gpd1 6 GPIO_ACTIVE_LOW>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		port@1 {
> +			reg = <1>;
> +			lvds_ep: endpoint {
> +				remote-endpoint = <&panel_ep>;
> +			};
> +		};
> +	};

-- 
Regards,

Laurent Pinchart

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 09/12] ARM: dts: exynos5250: add mipi-phy node
  2018-05-28  9:47     ` [PATCH 09/12] ARM: dts: exynos5250: add mipi-phy node Maciej Purski
@ 2018-05-28 16:24       ` Krzysztof Kozlowski
  0 siblings, 0 replies; 24+ messages in thread
From: Krzysztof Kozlowski @ 2018-05-28 16:24 UTC (permalink / raw)
  To: Maciej Purski
  Cc: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree,
	dri-devel, David Airlie, Rob Herring, Mark Rutland,
	Thierry Reding, Kukjin Kim, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz

On Mon, May 28, 2018 at 11:47 AM, Maciej Purski <m.purski@samsung.com> wrote:
> The patch adds phy node, required by MIPI devices.
>
> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
> Signed-off-by: Maciej Purski <m.purski@samsung.com>

This have pretty small changes since original Andrzej's patch so
probably Andrzej's authorship should be preserved.

> ---
>  arch/arm/boot/dts/exynos5250.dtsi | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi
> index 2daf505..a63b655 100644
> --- a/arch/arm/boot/dts/exynos5250.dtsi
> +++ b/arch/arm/boot/dts/exynos5250.dtsi
> @@ -733,6 +733,12 @@
>                         #phy-cells = <0>;
>                 };
>
> +               mipi_phy: video-phy@10040710 {
> +                       compatible = "samsung,s5pv210-mipi-video-phy";

No DTC warnings (make dtbs W=1)? reg is missing so DTC should complain.

Best regards,
Krzysztof

> +                       #phy-cells = <1>;
> +                       syscon = <&pmu_system_controller>;
> +               };
> +
>                 adc: adc@12d10000 {
>                         compatible = "samsung,exynos-adc-v1";
>                         reg = <0x12D10000 0x100>;
> --
> 2.7.4
>

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 08/12] drm/bridge: tc358764: Add DSI to LVDS bridge driver
  2018-05-28  9:47     ` [PATCH 08/12] drm/bridge: tc358764: Add DSI to LVDS bridge driver Maciej Purski
@ 2018-05-28 16:24       ` Randy Dunlap
  2018-05-30  7:45       ` kbuild test robot
  1 sibling, 0 replies; 24+ messages in thread
From: Randy Dunlap @ 2018-05-28 16:24 UTC (permalink / raw)
  To: Maciej Purski, linux-kernel, linux-arm-kernel, linux-samsung-soc,
	devicetree, dri-devel
  Cc: David Airlie, Rob Herring, Mark Rutland, Thierry Reding,
	Kukjin Kim, Krzysztof Kozlowski, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz

On 05/28/2018 02:47 AM, Maciej Purski wrote:
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index fa2c799..58e19af 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -110,6 +110,13 @@ config DRM_THINE_THC63LVD1024
>  	---help---
>  	  Thine THC63LVD1024 LVDS/parallel converter driver.
>  
> +config DRM_TOSHIBA_TC358764
> +	tristate "TC358764 DSI/LVDS bridge"
> +	depends on DRM && DRM_PANEL
> +	depends on OF
> +	select DRM_MIPI_DSI
> +	select VIDEOMODE_HELPERS
> +

Kconfig symbols with "prompt strings" should also have help text.

I expected checkpatch to catch that, but I tested it and there was no warning
from checkpatch about help text.  OTOH, there was a warning that there are
2 lines in this patch that end with whitespace, so that should be fixed.

Did you use checkpatch (scripts/checkpatch.pl)?

>  config DRM_TOSHIBA_TC358767
>  	tristate "Toshiba TC358767 eDP bridge"
>  	depends on OF

thanks,
-- 
~Randy

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 10/12] ARM: dts: exynos5250: add DSI node
  2018-05-28  9:54     ` [PATCH 10/12] ARM: dts: exynos5250: add DSI node Maciej Purski
@ 2018-05-28 16:36       ` Krzysztof Kozlowski
  0 siblings, 0 replies; 24+ messages in thread
From: Krzysztof Kozlowski @ 2018-05-28 16:36 UTC (permalink / raw)
  To: Maciej Purski
  Cc: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree,
	dri-devel, David Airlie, Rob Herring, Mark Rutland,
	Thierry Reding, Kukjin Kim, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz

On Mon, May 28, 2018 at 11:54 AM, Maciej Purski <m.purski@samsung.com> wrote:
> The patch adds common part of DSI node for Exynos5250 platforms.
>
> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
> Signed-off-by: Maciej Purski <m.purski@samsung.com>
> ---
>  arch/arm/boot/dts/exynos5250.dtsi | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)


This should be squashed with previous patch because it is logically
the same feature. The purpose of PHY is this DSI node so splitting it
is slightly too much.

Best regards,
Krzysztof

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 12/12] ARM: dts: exynos5250-arndale: add dsi and panel nodes
  2018-05-28  9:55     ` [PATCH 12/12] ARM: dts: exynos5250-arndale: add dsi and panel nodes Maciej Purski
@ 2018-05-28 16:41       ` Krzysztof Kozlowski
  0 siblings, 0 replies; 24+ messages in thread
From: Krzysztof Kozlowski @ 2018-05-28 16:41 UTC (permalink / raw)
  To: Maciej Purski
  Cc: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree,
	dri-devel, David Airlie, Rob Herring, Mark Rutland,
	Thierry Reding, Kukjin Kim, Archit Taneja, Andrzej Hajda,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz

On Mon, May 28, 2018 at 11:55 AM, Maciej Purski <m.purski@samsung.com> wrote:
> The patch adds bridge and panel nodes.
> It adds also DSI properties specific for arndale board.
>
> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
> Signed-off-by: Maciej Purski <m.purski@samsung.com>
> ---
>  arch/arm/boot/dts/exynos5250-arndale.dts | 39 ++++++++++++++++++++++++++++++++
>  1 file changed, 39 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos5250-arndale.dts b/arch/arm/boot/dts/exynos5250-arndale.dts
> index 80221fa..6f0b1c4 100644
> --- a/arch/arm/boot/dts/exynos5250-arndale.dts
> +++ b/arch/arm/boot/dts/exynos5250-arndale.dts
> @@ -71,6 +71,17 @@
>                 };
>         };
>
> +       panel: panel {
> +               compatible = "boe,hv070wsa-100";
> +               power-supply = <&vcc_3v3_reg>;
> +               enable-gpios = <&gpd1 3 GPIO_ACTIVE_HIGH>;
> +               port {
> +                       panel_ep: endpoint {
> +                               remote-endpoint = <&bridge_out_ep>;
> +                       };
> +               };
> +       };
> +
>         regulators {
>                 compatible = "simple-bus";
>                 #address-cells = <1>;
> @@ -476,6 +487,34 @@
>         };
>  };
>
> +&dsi_0 {

Please put the node alphabetically, so before &dp.

Also this patch should be squashed with previous one (regulators),
because adding non-controllable fixed regulators on its own does not
bring benefits. Linux will not disable them. You added these
regulators for the bridge below. Without the bridge, their existence
does not have much sense.

Best regards,
Krzysztof

> +       vddcore-supply = <&ldo8_reg>;
> +       vddio-supply = <&ldo10_reg>;
> +       samsung,pll-clock-frequency = <24000000>;
> +       samsung,burst-clock-frequency = <320000000>;
> +       samsung,esc-clock-frequency = <10000000>;
> +       status = "okay";
> +
> +       bridge@0 {
> +               reg = <0>;
> +               compatible = "toshiba,tc358764";
> +               vddc-supply = <&vcc_1v2_reg>;
> +               vddio-supply = <&vcc_1v8_reg>;
> +               vddmipi-supply = <&vcc_1v2_reg>;
> +               vddlvds133-supply = <&vcc_3v3_reg>;
> +               vddlvds112-supply = <&vcc_1v2_reg>;
> +               reset-gpios = <&gpd1 6 GPIO_ACTIVE_LOW>;
> +               #address-cells = <1>;
> +               #size-cells = <0>;
> +               port@1 {
> +                       reg = <1>;
> +                       bridge_out_ep: endpoint {
> +                               remote-endpoint = <&panel_ep>;
> +                       };
> +               };
> +       };
> +};
> +
>  &i2c_2 {
>         status = "okay";
>         /* used by HDMI DDC */
> --
> 2.7.4
>

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 08/12] drm/bridge: tc358764: Add DSI to LVDS bridge driver
  2018-05-28  9:47     ` [PATCH 08/12] drm/bridge: tc358764: Add DSI to LVDS bridge driver Maciej Purski
  2018-05-28 16:24       ` Randy Dunlap
@ 2018-05-30  7:45       ` kbuild test robot
  2018-05-30  8:27         ` Andrzej Hajda
  1 sibling, 1 reply; 24+ messages in thread
From: kbuild test robot @ 2018-05-30  7:45 UTC (permalink / raw)
  To: Maciej Purski
  Cc: kbuild-all, linux-kernel, linux-arm-kernel, linux-samsung-soc,
	devicetree, dri-devel, David Airlie, Rob Herring, Mark Rutland,
	Thierry Reding, Kukjin Kim, Krzysztof Kozlowski, Archit Taneja,
	Andrzej Hajda, Laurent Pinchart, Inki Dae, Joonyoung Shim,
	Seung-Woo Kim, Kyungmin Park, Marek Szyprowski,
	Bartlomiej Zolnierkiewicz, Maciej Purski

Hi Maciej,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20180517]
[cannot apply to drm-exynos/exynos-drm/for-next robh/for-next drm/drm-next v4.17-rc6 v4.17-rc5 v4.17-rc4 v4.17-rc7]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Maciej-Purski/Add-TOSHIBA-TC358764-DSI-LVDS-bridge-driver/20180530-011258
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/gpu/drm/bridge/tc358764.c:193:14: sparse: incorrect type in assignment (different base types) @@    expected unsigned short [unsigned] [addressable] [usertype] addr @@    got ed] [addressable] [usertype] addr @@
   drivers/gpu/drm/bridge/tc358764.c:193:14:    expected unsigned short [unsigned] [addressable] [usertype] addr
   drivers/gpu/drm/bridge/tc358764.c:193:14:    got restricted __le16 [usertype] <noident>
>> drivers/gpu/drm/bridge/tc358764.c:197:24: sparse: cast to restricted __le32
>> drivers/gpu/drm/bridge/tc358764.c:175:5: sparse: symbol 'tc358764_read' was not declared. Should it be static?
>> drivers/gpu/drm/bridge/tc358764.c:204:5: sparse: symbol 'tc358764_write' was not declared. Should it be static?

vim +193 drivers/gpu/drm/bridge/tc358764.c

   174	
 > 175	int tc358764_read(struct tc358764 *ctx, u16 addr, u32 *val)
   176	{
   177		struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
   178		const struct mipi_dsi_host_ops *ops = dsi->host->ops;
   179		struct mipi_dsi_msg msg = {
   180			.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM,
   181			.channel = dsi->channel,
   182			.flags = MIPI_DSI_MSG_USE_LPM,
   183			.tx_buf = &addr,
   184			.tx_len = 2,
   185			.rx_buf = val,
   186			.rx_len = 4
   187		};
   188		ssize_t ret;
   189	
   190		if (!ops || !ops->transfer)
   191			return -EINVAL;
   192	
 > 193		addr = cpu_to_le16(addr);
   194	
   195		ret = ops->transfer(dsi->host, &msg);
   196		if (ret >= 0)
 > 197			*val = le32_to_cpu(*val);
   198	
   199		dev_dbg(ctx->dev, "read: %d, addr: %d\n", addr, *val);
   200	
   201		return ret;
   202	}
   203	
 > 204	int tc358764_write(struct tc358764 *ctx, u16 addr, u32 val)
   205	{
   206		struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
   207		const struct mipi_dsi_host_ops *ops = dsi->host->ops;
   208		u8 data[6];
   209		int ret;
   210		struct mipi_dsi_msg msg = {
   211			.type = MIPI_DSI_GENERIC_LONG_WRITE,
   212			.channel = dsi->channel,
   213			.flags = MIPI_DSI_MSG_USE_LPM | MIPI_DSI_MSG_REQ_ACK,
   214			.tx_buf = data,
   215			.tx_len = 6
   216		};
   217	
   218		if (!ops || !ops->transfer)
   219			return -EINVAL;
   220	
   221		data[0] = addr;
   222		data[1] = addr >> 8;
   223		data[2] = val;
   224		data[3] = val >> 8;
   225		data[4] = val >> 16;
   226		data[5] = val >> 24;
   227	
   228		ret = ops->transfer(dsi->host, &msg);
   229	
   230		return ret;
   231	}
   232	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 08/12] drm/bridge: tc358764: Add DSI to LVDS bridge driver
  2018-05-30  7:45       ` kbuild test robot
@ 2018-05-30  8:27         ` Andrzej Hajda
  0 siblings, 0 replies; 24+ messages in thread
From: Andrzej Hajda @ 2018-05-30  8:27 UTC (permalink / raw)
  To: kbuild test robot, Maciej Purski
  Cc: kbuild-all, linux-kernel, linux-arm-kernel, linux-samsung-soc,
	devicetree, dri-devel, David Airlie, Rob Herring, Mark Rutland,
	Thierry Reding, Kukjin Kim, Krzysztof Kozlowski, Archit Taneja,
	Laurent Pinchart, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, Marek Szyprowski, Bartlomiej Zolnierkiewicz

Hi Maciej,


On 30.05.2018 09:45, kbuild test robot wrote:
> Hi Maciej,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on next-20180517]
> [cannot apply to drm-exynos/exynos-drm/for-next robh/for-next drm/drm-next v4.17-rc6 v4.17-rc5 v4.17-rc4 v4.17-rc7]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url:    https://github.com/0day-ci/linux/commits/Maciej-Purski/Add-TOSHIBA-TC358764-DSI-LVDS-bridge-driver/20180530-011258
> reproduce:
>         # apt-get install sparse
>         make ARCH=x86_64 allmodconfig
>         make C=1 CF=-D__CHECK_ENDIAN__
>
>
> sparse warnings: (new ones prefixed by >>)
>
>>> drivers/gpu/drm/bridge/tc358764.c:193:14: sparse: incorrect type in assignment (different base types) @@    expected unsigned short [unsigned] [addressable] [usertype] addr @@    got ed] [addressable] [usertype] addr @@
>    drivers/gpu/drm/bridge/tc358764.c:193:14:    expected unsigned short [unsigned] [addressable] [usertype] addr
>    drivers/gpu/drm/bridge/tc358764.c:193:14:    got restricted __le16 [usertype] <noident>
>>> drivers/gpu/drm/bridge/tc358764.c:197:24: sparse: cast to restricted __le32
>>> drivers/gpu/drm/bridge/tc358764.c:175:5: sparse: symbol 'tc358764_read' was not declared. Should it be static?
>>> drivers/gpu/drm/bridge/tc358764.c:204:5: sparse: symbol 'tc358764_write' was not declared. Should it be static?
> vim +193 drivers/gpu/drm/bridge/tc358764.c
>
>    174	
>  > 175	int tc358764_read(struct tc358764 *ctx, u16 addr, u32 *val)

add static

>    176	{
>    177		struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>    178		const struct mipi_dsi_host_ops *ops = dsi->host->ops;
>    179		struct mipi_dsi_msg msg = {
>    180			.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM,
>    181			.channel = dsi->channel,
>    182			.flags = MIPI_DSI_MSG_USE_LPM,
>    183			.tx_buf = &addr,
>    184			.tx_len = 2,
>    185			.rx_buf = val,
>    186			.rx_len = 4
>    187		};
>    188		ssize_t ret;
>    189	
>    190		if (!ops || !ops->transfer)
>    191			return -EINVAL;
>    192	
>  > 193		addr = cpu_to_le16(addr);

It should be changed to:

cpu_to_le16s(&addr);

>    194	
>    195		ret = ops->transfer(dsi->host, &msg);
>    196		if (ret >= 0)
>  > 197			*val = le32_to_cpu(*val);

le32_to_cpus(val);

>    198	
>    199		dev_dbg(ctx->dev, "read: %d, addr: %d\n", addr, *val);
>    200	
>    201		return ret;
>    202	}
>    203	
>  > 204	int tc358764_write(struct tc358764 *ctx, u16 addr, u32 val)

add static


Regards
Andrzej

>    205	{
>    206		struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>    207		const struct mipi_dsi_host_ops *ops = dsi->host->ops;
>    208		u8 data[6];
>    209		int ret;
>    210		struct mipi_dsi_msg msg = {
>    211			.type = MIPI_DSI_GENERIC_LONG_WRITE,
>    212			.channel = dsi->channel,
>    213			.flags = MIPI_DSI_MSG_USE_LPM | MIPI_DSI_MSG_REQ_ACK,
>    214			.tx_buf = data,
>    215			.tx_len = 6
>    216		};
>    217	
>    218		if (!ops || !ops->transfer)
>    219			return -EINVAL;
>    220	
>    221		data[0] = addr;
>    222		data[1] = addr >> 8;
>    223		data[2] = val;
>    224		data[3] = val >> 8;
>    225		data[4] = val >> 16;
>    226		data[5] = val >> 24;
>    227	
>    228		ret = ops->transfer(dsi->host, &msg);
>    229	
>    230		return ret;
>    231	}
>    232	
>
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
>
>
>

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 07/12] dt-bindings: tc358754: add DT bindings
  2018-05-28 10:18       ` Laurent Pinchart
@ 2018-05-30  9:59         ` Andrzej Hajda
  2018-05-30 12:35           ` Laurent Pinchart
  0 siblings, 1 reply; 24+ messages in thread
From: Andrzej Hajda @ 2018-05-30  9:59 UTC (permalink / raw)
  To: Laurent Pinchart, Maciej Purski
  Cc: linux-kernel, linux-arm-kernel, linux-samsung-soc, devicetree,
	dri-devel, David Airlie, Rob Herring, Mark Rutland,
	Thierry Reding, Kukjin Kim, Krzysztof Kozlowski, Archit Taneja,
	Inki Dae, Joonyoung Shim, Seung-Woo Kim, Kyungmin Park,
	Marek Szyprowski, Bartlomiej Zolnierkiewicz

On 28.05.2018 12:18, Laurent Pinchart wrote:
> Hi Maciej,
>
> Thank you for the patch.
>
> On Monday, 28 May 2018 12:47:11 EEST Maciej Purski wrote:
>> The patch adds bindings to Toshiba DSI/LVDS bridge TC358764.
>> Bindings describe power supplies, reset gpio and video interfaces.
>>
>> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
>> Signed-off-by: Maciej Purski <m.purski@samsung.com>
>> ---
>>  .../bindings/display/bridge/toshiba,tc358764.txt   | 42 +++++++++++++++++++
>>  1 file changed, 42 insertions(+)
>>  create mode 100644
>> Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
>>
>> diff --git
>> a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
>> b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt new
>> file mode 100644
>> index 0000000..d09bdc2
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
>> @@ -0,0 +1,42 @@
>> +TC358764 MIPI-DSI to LVDS panel bridge
>> +
>> +Required properties:
>> +  - compatible: "toshiba,tc358764"
>> +  - reg: the virtual channel number of a DSI peripheral
>> +  - vddc-supply: core voltage supply
>> +  - vddio-supply: I/O voltage supply
>> +  - vddmipi-supply: MIPI voltage supply
>> +  - vddlvds133-supply: LVDS1 3.3V voltage supply
>> +  - vddlvds112-supply: LVDS1 1.2V voltage supply
> That's a lot of power supplies. Could some of them be merged together ? See 
> https://patchwork.freedesktop.org/patch/216058/ for an earlier discussion on 
> the same subject.

Specs says about 3 supply voltage values:
- 1.2V - digital core, DSI-RX PHY
- 1.8-3.3V - digital I/O
- 3.3V - LVDS-TX PHY

So I guess it should be minimal number of supplies. Natural candidates:

- vddc-supply: core voltage supply, 1.2V
- vddio-supply: I/O voltage supply, 1.8V or 3.3V
- vddlvds-supply: LVDS1/2 voltage supply, 3.3V

I have changed name of the latest supply to be more consistent with
other supplies, and changed 1.8-3.3 (which incorrectly suggest voltage
range), to more precise voltage alternative.


>
>> +  - reset-gpios: a GPIO spec for the reset pin
>> +
>> +The device node can contain zero to two 'port' child nodes, each with one
>> +child
>> +'endpoint' node, according to the bindings defined in [1].
>> +The following are properties specific to those nodes.
>> +
>> +port:
>> +  - reg: (required) can be 0 for DSI port or 1 for LVDS port;
> This seems pretty vague to me. It could be read as meaning that ports are 
> completely optional, and that the port number you list can be used, but that 
> something else could be used to.
>
> Let's make the port nodes mandatory. I propose the following.
>
> Required nodes:
>
> The TC358764 has DSI and LVDS ports whose connections are described using the 
> OF graph bindings defined in Documentation/devicetree/bindings/graph.txt. The 
> device node must contain one 'port' child node per DSI and LVDS port. The port 
> nodes are numbered as follows.
>
>   Port                  Number
> -------------------------------------------------------------------
>   DSI Input             0
>   LVDS Output           1
>
> Each port node must contain endpoint nodes describing the hardware 
> connections.

Since the bridge is controlled via DSI bus, DSI input port is not necessary.

Regards
Andrzej


>
>> +[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
>> +
>> +Example:
>> +
>> +	bridge@0 {
>> +		reg = <0>;
>> +		compatible = "toshiba,tc358764";
>> +		vddc-supply = <&vcc_1v2_reg>;
>> +		vddio-supply = <&vcc_1v8_reg>;
>> +		vddmipi-supply = <&vcc_1v2_reg>;
>> +		vddlvds133-supply = <&vcc_3v3_reg>;
>> +		vddlvds112-supply = <&vcc_1v2_reg>;
>> +		reset-gpios = <&gpd1 6 GPIO_ACTIVE_LOW>;
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +		port@1 {
>> +			reg = <1>;
>> +			lvds_ep: endpoint {
>> +				remote-endpoint = <&panel_ep>;
>> +			};
>> +		};
>> +	};

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 07/12] dt-bindings: tc358754: add DT bindings
  2018-05-30  9:59         ` Andrzej Hajda
@ 2018-05-30 12:35           ` Laurent Pinchart
  2018-05-30 13:07             ` Andrzej Hajda
  0 siblings, 1 reply; 24+ messages in thread
From: Laurent Pinchart @ 2018-05-30 12:35 UTC (permalink / raw)
  To: Andrzej Hajda
  Cc: Maciej Purski, linux-kernel, linux-arm-kernel, linux-samsung-soc,
	devicetree, dri-devel, David Airlie, Rob Herring, Mark Rutland,
	Thierry Reding, Kukjin Kim, Krzysztof Kozlowski, Archit Taneja,
	Inki Dae, Joonyoung Shim, Seung-Woo Kim, Kyungmin Park,
	Marek Szyprowski, Bartlomiej Zolnierkiewicz

Hi Andrzej,

On Wednesday, 30 May 2018 12:59:12 EEST Andrzej Hajda wrote:
> On 28.05.2018 12:18, Laurent Pinchart wrote:
> > On Monday, 28 May 2018 12:47:11 EEST Maciej Purski wrote:
> >> The patch adds bindings to Toshiba DSI/LVDS bridge TC358764.
> >> Bindings describe power supplies, reset gpio and video interfaces.
> >> 
> >> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
> >> Signed-off-by: Maciej Purski <m.purski@samsung.com>
> >> ---
> >> 
> >>  .../bindings/display/bridge/toshiba,tc358764.txt   | 42 ++++++++++++++++
> >>  1 file changed, 42 insertions(+)
> >>  create mode 100644
> >> 
> >> Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> >> 
> >> diff --git
> >> a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> >> b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> >> new
> >> file mode 100644
> >> index 0000000..d09bdc2
> >> --- /dev/null
> >> +++
> >> b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> >> @@ -0,0 +1,42 @@
> >> +TC358764 MIPI-DSI to LVDS panel bridge
> >> +
> >> +Required properties:
> >> +  - compatible: "toshiba,tc358764"
> >> +  - reg: the virtual channel number of a DSI peripheral
> >> +  - vddc-supply: core voltage supply
> >> +  - vddio-supply: I/O voltage supply
> >> +  - vddmipi-supply: MIPI voltage supply
> >> +  - vddlvds133-supply: LVDS1 3.3V voltage supply
> >> +  - vddlvds112-supply: LVDS1 1.2V voltage supply
> > 
> > That's a lot of power supplies. Could some of them be merged together ?
> > See https://patchwork.freedesktop.org/patch/216058/ for an earlier
> > discussion on the same subject.
> 
> Specs says about 3 supply voltage values:
> - 1.2V - digital core, DSI-RX PHY
> - 1.8-3.3V - digital I/O
> - 3.3V - LVDS-TX PHY
> 
> So I guess it should be minimal number of supplies. Natural candidates:
> 
> - vddc-supply: core voltage supply, 1.2V
> - vddio-supply: I/O voltage supply, 1.8V or 3.3V
> - vddlvds-supply: LVDS1/2 voltage supply, 3.3V
> 
> I have changed name of the latest supply to be more consistent with
> other supplies, and changed 1.8-3.3 (which incorrectly suggest voltage
> range), to more precise voltage alternative.

This looks fine to me.

> >> +  - reset-gpios: a GPIO spec for the reset pin
> >> +
> >> +The device node can contain zero to two 'port' child nodes, each with
> >> one
> >> +child
> >> +'endpoint' node, according to the bindings defined in [1].
> >> +The following are properties specific to those nodes.
> >> +
> >> +port:
> >> +  - reg: (required) can be 0 for DSI port or 1 for LVDS port;
> > 
> > This seems pretty vague to me. It could be read as meaning that ports are
> > completely optional, and that the port number you list can be used, but
> > that something else could be used to.
> > 
> > Let's make the port nodes mandatory. I propose the following.
> > 
> > Required nodes:
> > 
> > The TC358764 has DSI and LVDS ports whose connections are described using
> > the OF graph bindings defined in
> > Documentation/devicetree/bindings/graph.txt. The device node must contain
> > one 'port' child node per DSI and LVDS port. The port nodes are numbered
> > as follows.
> > 
> >   Port                  Number
> > -------------------------------------------------------------------
> >   DSI Input             0
> >   LVDS Output           1
> > 
> > Each port node must contain endpoint nodes describing the hardware
> > connections.
> 
> Since the bridge is controlled via DSI bus, DSI input port is not necessary.

I don't agree with this. Regardless of how the bridge is controlled, I think 
we should always use ports to describe the data connections. Otherwise it 
would get more complicated for display controller drivers to use different 
types of bridges.

> >> +[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
> >> +
> >> +Example:
> >> +
> >> +	bridge@0 {
> >> +		reg = <0>;
> >> +		compatible = "toshiba,tc358764";
> >> +		vddc-supply = <&vcc_1v2_reg>;
> >> +		vddio-supply = <&vcc_1v8_reg>;
> >> +		vddmipi-supply = <&vcc_1v2_reg>;
> >> +		vddlvds133-supply = <&vcc_3v3_reg>;
> >> +		vddlvds112-supply = <&vcc_1v2_reg>;
> >> +		reset-gpios = <&gpd1 6 GPIO_ACTIVE_LOW>;
> >> +		#address-cells = <1>;
> >> +		#size-cells = <0>;
> >> +		port@1 {
> >> +			reg = <1>;
> >> +			lvds_ep: endpoint {
> >> +				remote-endpoint = <&panel_ep>;
> >> +			};
> >> +		};
> >> +	};

-- 
Regards,

Laurent Pinchart

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 07/12] dt-bindings: tc358754: add DT bindings
  2018-05-30 12:35           ` Laurent Pinchart
@ 2018-05-30 13:07             ` Andrzej Hajda
  2018-05-30 13:20               ` Laurent Pinchart
  0 siblings, 1 reply; 24+ messages in thread
From: Andrzej Hajda @ 2018-05-30 13:07 UTC (permalink / raw)
  To: Laurent Pinchart
  Cc: Maciej Purski, linux-kernel, linux-arm-kernel, linux-samsung-soc,
	devicetree, dri-devel, David Airlie, Rob Herring, Mark Rutland,
	Thierry Reding, Kukjin Kim, Krzysztof Kozlowski, Archit Taneja,
	Inki Dae, Joonyoung Shim, Seung-Woo Kim, Kyungmin Park,
	Marek Szyprowski, Bartlomiej Zolnierkiewicz

On 30.05.2018 14:35, Laurent Pinchart wrote:
> Hi Andrzej,
>
> On Wednesday, 30 May 2018 12:59:12 EEST Andrzej Hajda wrote:
>> On 28.05.2018 12:18, Laurent Pinchart wrote:
>>> On Monday, 28 May 2018 12:47:11 EEST Maciej Purski wrote:
>>>> The patch adds bindings to Toshiba DSI/LVDS bridge TC358764.
>>>> Bindings describe power supplies, reset gpio and video interfaces.
>>>>
>>>> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
>>>> Signed-off-by: Maciej Purski <m.purski@samsung.com>
>>>> ---
>>>>
>>>>  .../bindings/display/bridge/toshiba,tc358764.txt   | 42 ++++++++++++++++
>>>>  1 file changed, 42 insertions(+)
>>>>  create mode 100644
>>>>
>>>> Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
>>>>
>>>> diff --git
>>>> a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
>>>> b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
>>>> new
>>>> file mode 100644
>>>> index 0000000..d09bdc2
>>>> --- /dev/null
>>>> +++
>>>> b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
>>>> @@ -0,0 +1,42 @@
>>>> +TC358764 MIPI-DSI to LVDS panel bridge
>>>> +
>>>> +Required properties:
>>>> +  - compatible: "toshiba,tc358764"
>>>> +  - reg: the virtual channel number of a DSI peripheral
>>>> +  - vddc-supply: core voltage supply
>>>> +  - vddio-supply: I/O voltage supply
>>>> +  - vddmipi-supply: MIPI voltage supply
>>>> +  - vddlvds133-supply: LVDS1 3.3V voltage supply
>>>> +  - vddlvds112-supply: LVDS1 1.2V voltage supply
>>> That's a lot of power supplies. Could some of them be merged together ?
>>> See https://patchwork.freedesktop.org/patch/216058/ for an earlier
>>> discussion on the same subject.
>> Specs says about 3 supply voltage values:
>> - 1.2V - digital core, DSI-RX PHY
>> - 1.8-3.3V - digital I/O
>> - 3.3V - LVDS-TX PHY
>>
>> So I guess it should be minimal number of supplies. Natural candidates:
>>
>> - vddc-supply: core voltage supply, 1.2V
>> - vddio-supply: I/O voltage supply, 1.8V or 3.3V
>> - vddlvds-supply: LVDS1/2 voltage supply, 3.3V
>>
>> I have changed name of the latest supply to be more consistent with
>> other supplies, and changed 1.8-3.3 (which incorrectly suggest voltage
>> range), to more precise voltage alternative.
> This looks fine to me.
>
>>>> +  - reset-gpios: a GPIO spec for the reset pin
>>>> +
>>>> +The device node can contain zero to two 'port' child nodes, each with
>>>> one
>>>> +child
>>>> +'endpoint' node, according to the bindings defined in [1].
>>>> +The following are properties specific to those nodes.
>>>> +
>>>> +port:
>>>> +  - reg: (required) can be 0 for DSI port or 1 for LVDS port;
>>> This seems pretty vague to me. It could be read as meaning that ports are
>>> completely optional, and that the port number you list can be used, but
>>> that something else could be used to.
>>>
>>> Let's make the port nodes mandatory. I propose the following.
>>>
>>> Required nodes:
>>>
>>> The TC358764 has DSI and LVDS ports whose connections are described using
>>> the OF graph bindings defined in
>>> Documentation/devicetree/bindings/graph.txt. The device node must contain
>>> one 'port' child node per DSI and LVDS port. The port nodes are numbered
>>> as follows.
>>>
>>>   Port                  Number
>>> -------------------------------------------------------------------
>>>   DSI Input             0
>>>   LVDS Output           1
>>>
>>> Each port node must contain endpoint nodes describing the hardware
>>> connections.
>> Since the bridge is controlled via DSI bus, DSI input port is not necessary.
> I don't agree with this. Regardless of how the bridge is controlled, I think 
> we should always use ports to describe the data connections. Otherwise it 
> would get more complicated for display controller drivers to use different 
> types of bridges.


It was discussed already, and DT guideline is to skip graphs in simple
case of parent/child nodes, see for example [1].

[1]: https://marc.info/?l=dri-devel&m=148354108702517&w=2

Regards
Andrzej

>>>> +[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
>>>> +
>>>> +Example:
>>>> +
>>>> +	bridge@0 {
>>>> +		reg = <0>;
>>>> +		compatible = "toshiba,tc358764";
>>>> +		vddc-supply = <&vcc_1v2_reg>;
>>>> +		vddio-supply = <&vcc_1v8_reg>;
>>>> +		vddmipi-supply = <&vcc_1v2_reg>;
>>>> +		vddlvds133-supply = <&vcc_3v3_reg>;
>>>> +		vddlvds112-supply = <&vcc_1v2_reg>;
>>>> +		reset-gpios = <&gpd1 6 GPIO_ACTIVE_LOW>;
>>>> +		#address-cells = <1>;
>>>> +		#size-cells = <0>;
>>>> +		port@1 {
>>>> +			reg = <1>;
>>>> +			lvds_ep: endpoint {
>>>> +				remote-endpoint = <&panel_ep>;
>>>> +			};
>>>> +		};
>>>> +	};

^ permalink raw reply	[flat|nested] 24+ messages in thread

* Re: [PATCH 07/12] dt-bindings: tc358754: add DT bindings
  2018-05-30 13:07             ` Andrzej Hajda
@ 2018-05-30 13:20               ` Laurent Pinchart
  0 siblings, 0 replies; 24+ messages in thread
From: Laurent Pinchart @ 2018-05-30 13:20 UTC (permalink / raw)
  To: Andrzej Hajda
  Cc: Maciej Purski, linux-kernel, linux-arm-kernel, linux-samsung-soc,
	devicetree, dri-devel, David Airlie, Rob Herring, Mark Rutland,
	Thierry Reding, Kukjin Kim, Krzysztof Kozlowski, Archit Taneja,
	Inki Dae, Joonyoung Shim, Seung-Woo Kim, Kyungmin Park,
	Marek Szyprowski, Bartlomiej Zolnierkiewicz

Hi Andrzej,

On Wednesday, 30 May 2018 16:07:29 EEST Andrzej Hajda wrote:
> On 30.05.2018 14:35, Laurent Pinchart wrote:
> > On Wednesday, 30 May 2018 12:59:12 EEST Andrzej Hajda wrote:
> >> On 28.05.2018 12:18, Laurent Pinchart wrote:
> >>> On Monday, 28 May 2018 12:47:11 EEST Maciej Purski wrote:
> >>>> The patch adds bindings to Toshiba DSI/LVDS bridge TC358764.
> >>>> Bindings describe power supplies, reset gpio and video interfaces.
> >>>> 
> >>>> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
> >>>> Signed-off-by: Maciej Purski <m.purski@samsung.com>
> >>>> ---
> >>>> 
> >>>>  .../bindings/display/bridge/toshiba,tc358764.txt   | 42
> >>>>  ++++++++++++++++
> >>>>  1 file changed, 42 insertions(+)
> >>>>  create mode 100644
> >>>> 
> >>>> Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> >>>> 
> >>>> diff --git
> >>>> a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> >>>> b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> >>>> new
> >>>> file mode 100644
> >>>> index 0000000..d09bdc2
> >>>> --- /dev/null
> >>>> +++
> >>>> b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358764.txt
> >>>> @@ -0,0 +1,42 @@
> >>>> +TC358764 MIPI-DSI to LVDS panel bridge
> >>>> +
> >>>> +Required properties:
> >>>> +  - compatible: "toshiba,tc358764"
> >>>> +  - reg: the virtual channel number of a DSI peripheral
> >>>> +  - vddc-supply: core voltage supply
> >>>> +  - vddio-supply: I/O voltage supply
> >>>> +  - vddmipi-supply: MIPI voltage supply
> >>>> +  - vddlvds133-supply: LVDS1 3.3V voltage supply
> >>>> +  - vddlvds112-supply: LVDS1 1.2V voltage supply
> >>> 
> >>> That's a lot of power supplies. Could some of them be merged together ?
> >>> See https://patchwork.freedesktop.org/patch/216058/ for an earlier
> >>> discussion on the same subject.
> >> 
> >> Specs says about 3 supply voltage values:
> >> - 1.2V - digital core, DSI-RX PHY
> >> - 1.8-3.3V - digital I/O
> >> - 3.3V - LVDS-TX PHY
> >> 
> >> So I guess it should be minimal number of supplies. Natural candidates:
> >> 
> >> - vddc-supply: core voltage supply, 1.2V
> >> - vddio-supply: I/O voltage supply, 1.8V or 3.3V
> >> - vddlvds-supply: LVDS1/2 voltage supply, 3.3V
> >> 
> >> I have changed name of the latest supply to be more consistent with
> >> other supplies, and changed 1.8-3.3 (which incorrectly suggest voltage
> >> range), to more precise voltage alternative.
> > 
> > This looks fine to me.
> > 
> >>>> +  - reset-gpios: a GPIO spec for the reset pin
> >>>> +
> >>>> +The device node can contain zero to two 'port' child nodes, each with
> >>>> one
> >>>> +child
> >>>> +'endpoint' node, according to the bindings defined in [1].
> >>>> +The following are properties specific to those nodes.
> >>>> +
> >>>> +port:
> >>>> +  - reg: (required) can be 0 for DSI port or 1 for LVDS port;
> >>> 
> >>> This seems pretty vague to me. It could be read as meaning that ports
> >>> are
> >>> completely optional, and that the port number you list can be used, but
> >>> that something else could be used to.
> >>> 
> >>> Let's make the port nodes mandatory. I propose the following.
> >>> 
> >>> Required nodes:
> >>> 
> >>> The TC358764 has DSI and LVDS ports whose connections are described
> >>> using
> >>> the OF graph bindings defined in
> >>> Documentation/devicetree/bindings/graph.txt. The device node must
> >>> contain
> >>> one 'port' child node per DSI and LVDS port. The port nodes are numbered
> >>> as follows.
> >>> 
> >>>   Port                  Number
> >>> 
> >>> -------------------------------------------------------------------
> >>> 
> >>>   DSI Input             0
> >>>   LVDS Output           1
> >>> 
> >>> Each port node must contain endpoint nodes describing the hardware
> >>> connections.
> >> 
> >> Since the bridge is controlled via DSI bus, DSI input port is not
> >> necessary.
> > 
> > I don't agree with this. Regardless of how the bridge is controlled, I
> > think we should always use ports to describe the data connections.
> > Otherwise it would get more complicated for display controller drivers to
> > use different types of bridges.
> 
> It was discussed already, and DT guideline is to skip graphs in simple
> case of parent/child nodes, see for example [1].
> 
> [1]: https://marc.info/?l=dri-devel&m=148354108702517&w=2

That's when the child as no other connection at all. I don't think it makes 
sense to mix description of connections through parent/child relationships and 
through ports for a single device.

And that being said, I don't agree with Rob's comment there. Having two 
different methods to describe connections means that you have to implement 
them both in all display controller drivers (and even all bridge drivers in 
the case of chained bridges). That's an extra complexity that can easily be 
avoided by standardizing DT bindings.

I also wonder whether Rob's position hasn't been reconsidered since then; I 
vaguely recalled another more recent discussion on this topic. I'm a bit too 
busy now to try and dig it up now I'm afraid :-/

> >>>> +[1]: Documentation/devicetree/bindings/media/video-interfaces.txt
> >>>> +
> >>>> +Example:
> >>>> +
> >>>> +	bridge@0 {
> >>>> +		reg = <0>;
> >>>> +		compatible = "toshiba,tc358764";
> >>>> +		vddc-supply = <&vcc_1v2_reg>;
> >>>> +		vddio-supply = <&vcc_1v8_reg>;
> >>>> +		vddmipi-supply = <&vcc_1v2_reg>;
> >>>> +		vddlvds133-supply = <&vcc_3v3_reg>;
> >>>> +		vddlvds112-supply = <&vcc_1v2_reg>;
> >>>> +		reset-gpios = <&gpd1 6 GPIO_ACTIVE_LOW>;
> >>>> +		#address-cells = <1>;
> >>>> +		#size-cells = <0>;
> >>>> +		port@1 {
> >>>> +			reg = <1>;
> >>>> +			lvds_ep: endpoint {
> >>>> +				remote-endpoint = <&panel_ep>;
> >>>> +			};
> >>>> +		};
> >>>> +	};

-- 
Regards,

Laurent Pinchart

^ permalink raw reply	[flat|nested] 24+ messages in thread

end of thread, other threads:[~2018-05-30 13:20 UTC | newest]

Thread overview: 24+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
     [not found] <CGME20180528094721eucas1p22b90fd838ce00f029fec7f5241cc06b5@eucas1p2.samsung.com>
2018-05-28  9:47 ` [PATCH 00/12] Add TOSHIBA TC358764 DSI/LVDS bridge driver Maciej Purski
     [not found]   ` <CGME20180528094722eucas1p28c087e8b9174e0591bf3cb6526885777@eucas1p2.samsung.com>
2018-05-28  9:47     ` [PATCH 01/12] drm/exynos: rename "bridge_node" to "mic_bridge_node" Maciej Purski
     [not found]   ` <CGME20180528094723eucas1p1776829e0b57d2ec6c4e28be872cf88fc@eucas1p1.samsung.com>
2018-05-28  9:47     ` [PATCH 02/12] drm/exynos: move pm_runtime_get_sync() to exynos_dsi_init() Maciej Purski
     [not found]   ` <CGME20180528094724eucas1p17a37e06002ed96d97aaca87231f13bbb@eucas1p1.samsung.com>
2018-05-28  9:47     ` [PATCH 03/12] drm/exynos: move connector creation to attach callback Maciej Purski
     [not found]   ` <CGME20180528094725eucas1p2e80e551edb29dd4ab437246f4896d108@eucas1p2.samsung.com>
2018-05-28  9:47     ` [PATCH 04/12] drm/exynos: add non-panel path to exynos_dsi_enable() Maciej Purski
     [not found]   ` <CGME20180528094726eucas1p14c9d821881865955a4d8b1735a650c8f@eucas1p1.samsung.com>
2018-05-28  9:47     ` [PATCH 05/12] panel/hv070wsa-100: add DT bindings Maciej Purski
     [not found]   ` <CGME20180528094727eucas1p272478562b72a95dac2fc1b03be57c514@eucas1p2.samsung.com>
2018-05-28  9:47     ` [PATCH 06/12] drm/panel: add support for BOE HV070WSA-100 panel to simple-panel Maciej Purski
     [not found]   ` <CGME20180528094727eucas1p153b8116120cd2195b15b74776f171cbe@eucas1p1.samsung.com>
2018-05-28  9:47     ` [PATCH 07/12] dt-bindings: tc358754: add DT bindings Maciej Purski
2018-05-28 10:18       ` Laurent Pinchart
2018-05-30  9:59         ` Andrzej Hajda
2018-05-30 12:35           ` Laurent Pinchart
2018-05-30 13:07             ` Andrzej Hajda
2018-05-30 13:20               ` Laurent Pinchart
     [not found]   ` <CGME20180528094728eucas1p128e8a44fa6c3bcb29d056a8191c039af@eucas1p1.samsung.com>
2018-05-28  9:47     ` [PATCH 08/12] drm/bridge: tc358764: Add DSI to LVDS bridge driver Maciej Purski
2018-05-28 16:24       ` Randy Dunlap
2018-05-30  7:45       ` kbuild test robot
2018-05-30  8:27         ` Andrzej Hajda
     [not found]   ` <CGME20180528094729eucas1p1cc26ea191a4ee1ba9daa06fae93037bf@eucas1p1.samsung.com>
2018-05-28  9:47     ` [PATCH 09/12] ARM: dts: exynos5250: add mipi-phy node Maciej Purski
2018-05-28 16:24       ` Krzysztof Kozlowski
     [not found]   ` <CGME20180528095444eucas1p222e4054b8fb8997258182e501f37a10b@eucas1p2.samsung.com>
2018-05-28  9:54     ` [PATCH 10/12] ARM: dts: exynos5250: add DSI node Maciej Purski
2018-05-28 16:36       ` Krzysztof Kozlowski
     [not found]   ` <CGME20180528095523eucas1p1039e1b62aaef415b66d6f62e86dbef93@eucas1p1.samsung.com>
2018-05-28  9:55     ` [PATCH 11/12] ARM: dts: exynos5250-arndale: add display regulators Maciej Purski
     [not found]   ` <CGME20180528095555eucas1p2fb61f362a3aa2d0082b8c4001b17f176@eucas1p2.samsung.com>
2018-05-28  9:55     ` [PATCH 12/12] ARM: dts: exynos5250-arndale: add dsi and panel nodes Maciej Purski
2018-05-28 16:41       ` Krzysztof Kozlowski

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