LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Pratyush Yadav <p.yadav@ti.com>
To: Vinod Koul <vkoul@kernel.org>
Cc: Nikhil Devshatwar <nikhil.nd@ti.com>,
	Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Pratyush Yadav <p.yadav@ti.com>,
	Chunfeng Yun <chunfeng.yun@mediatek.com>,
	Kishon Vijay Abraham I <kishon@ti.com>,
	Peter Chen <peter.chen@nxp.com>, <linux-kernel@vger.kernel.org>,
	<linux-phy@lists.infradead.org>
Subject: [PATCH v3 2/7] phy: cdns-dphy: Prepare for Rx support
Date: Fri, 25 Jun 2021 00:11:03 +0530	[thread overview]
Message-ID: <20210624184108.21312-3-p.yadav@ti.com> (raw)
In-Reply-To: <20210624184108.21312-1-p.yadav@ti.com>

The Rx programming sequence differs from the Tx programming sequence.
Currently only Tx mode is supported. Move all the Tx related parts into
a set of Tx-specific hooks that are then called by the main PHY
framework hooks. This way when Rx support is added all that is needed to
be done is to plug in the Rx hooks.

The clocks "psm" and "pll_ref" are not used by the Rx path so make them
optional in the probe and then check if they exist in the power_on()
hook.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---

(no changes since v1)

 drivers/phy/cadence/cdns-dphy.c | 140 ++++++++++++++++++++++++--------
 1 file changed, 104 insertions(+), 36 deletions(-)

diff --git a/drivers/phy/cadence/cdns-dphy.c b/drivers/phy/cadence/cdns-dphy.c
index ba042e39cfaf..8656f2102a91 100644
--- a/drivers/phy/cadence/cdns-dphy.c
+++ b/drivers/phy/cadence/cdns-dphy.c
@@ -75,6 +75,11 @@ struct cdns_dphy;
 struct cdns_dphy_ops {
 	int (*probe)(struct cdns_dphy *dphy);
 	void (*remove)(struct cdns_dphy *dphy);
+	int (*power_on)(struct cdns_dphy *dphy);
+	int (*power_off)(struct cdns_dphy *dphy);
+	int (*validate)(struct cdns_dphy *dphy, enum phy_mode mode, int submode,
+			union phy_configure_opts *opts);
+	int (*configure)(struct cdns_dphy *dphy, union phy_configure_opts *opts);
 	void (*set_psm_div)(struct cdns_dphy *dphy, u8 div);
 	void (*set_clk_lane_cfg)(struct cdns_dphy *dphy,
 				 enum cdns_dphy_clk_lane_cfg cfg);
@@ -86,12 +91,18 @@ struct cdns_dphy_ops {
 struct cdns_dphy {
 	struct cdns_dphy_cfg cfg;
 	void __iomem *regs;
+	struct device *dev;
 	struct clk *psm_clk;
 	struct clk *pll_ref_clk;
 	const struct cdns_dphy_ops *ops;
 	struct phy *phy;
 };
 
+struct cdns_dphy_driver_data {
+	const struct cdns_dphy_ops *tx;
+	const struct cdns_dphy_ops *rx;
+};
+
 static int cdns_dsi_get_dphy_pll_cfg(struct cdns_dphy *dphy,
 				     struct cdns_dphy_cfg *cfg,
 				     struct phy_configure_opts_mipi_dphy *opts,
@@ -199,20 +210,9 @@ static void cdns_dphy_ref_set_psm_div(struct cdns_dphy *dphy, u8 div)
 	       dphy->regs + DPHY_PSM_CFG);
 }
 
-/*
- * This is the reference implementation of DPHY hooks. Specific integration of
- * this IP may have to re-implement some of them depending on how they decided
- * to wire things in the SoC.
- */
-static const struct cdns_dphy_ops ref_dphy_ops = {
-	.get_wakeup_time_ns = cdns_dphy_ref_get_wakeup_time_ns,
-	.set_pll_cfg = cdns_dphy_ref_set_pll_cfg,
-	.set_psm_div = cdns_dphy_ref_set_psm_div,
-};
-
-static int cdns_dphy_config_from_opts(struct phy *phy,
-				      struct phy_configure_opts_mipi_dphy *opts,
-				      struct cdns_dphy_cfg *cfg)
+static int cdns_dphy_tx_config_from_opts(struct phy *phy,
+					 struct phy_configure_opts_mipi_dphy *opts,
+					 struct cdns_dphy_cfg *cfg)
 {
 	struct cdns_dphy *dphy = phy_get_drvdata(phy);
 	unsigned int dsi_hfp_ext = 0;
@@ -232,24 +232,13 @@ static int cdns_dphy_config_from_opts(struct phy *phy,
 	return 0;
 }
 
-static int cdns_dphy_validate(struct phy *phy, enum phy_mode mode, int submode,
-			      union phy_configure_opts *opts)
+static int cdns_dphy_tx_configure(struct cdns_dphy *dphy,
+				  union phy_configure_opts *opts)
 {
 	struct cdns_dphy_cfg cfg = { 0 };
-
-	if (mode != PHY_MODE_MIPI_DPHY)
-		return -EINVAL;
-
-	return cdns_dphy_config_from_opts(phy, &opts->mipi_dphy, &cfg);
-}
-
-static int cdns_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
-{
-	struct cdns_dphy *dphy = phy_get_drvdata(phy);
-	struct cdns_dphy_cfg cfg = { 0 };
 	int ret;
 
-	ret = cdns_dphy_config_from_opts(phy, &opts->mipi_dphy, &cfg);
+	ret = cdns_dphy_tx_config_from_opts(dphy->phy, &opts->mipi_dphy, &cfg);
 	if (ret)
 		return ret;
 
@@ -279,9 +268,21 @@ static int cdns_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
 	return 0;
 }
 
-static int cdns_dphy_power_on(struct phy *phy)
+static int cdns_dphy_tx_validate(struct cdns_dphy *dphy, enum phy_mode mode,
+				 int submode, union phy_configure_opts *opts)
 {
-	struct cdns_dphy *dphy = phy_get_drvdata(phy);
+	struct cdns_dphy_cfg cfg = { 0 };
+
+	if (submode != PHY_MIPI_DPHY_SUBMODE_TX)
+		return -EINVAL;
+
+	return cdns_dphy_tx_config_from_opts(dphy->phy, &opts->mipi_dphy, &cfg);
+}
+
+static int cdns_dphy_tx_power_on(struct cdns_dphy *dphy)
+{
+	if (!dphy->psm_clk || !dphy->pll_ref_clk)
+		return -EINVAL;
 
 	clk_prepare_enable(dphy->psm_clk);
 	clk_prepare_enable(dphy->pll_ref_clk);
@@ -293,16 +294,77 @@ static int cdns_dphy_power_on(struct phy *phy)
 	return 0;
 }
 
-static int cdns_dphy_power_off(struct phy *phy)
+static int cdns_dphy_tx_power_off(struct cdns_dphy *dphy)
 {
-	struct cdns_dphy *dphy = phy_get_drvdata(phy);
-
 	clk_disable_unprepare(dphy->pll_ref_clk);
 	clk_disable_unprepare(dphy->psm_clk);
 
 	return 0;
 }
 
+static const struct cdns_dphy_ops tx_ref_dphy_ops = {
+	.power_on = cdns_dphy_tx_power_on,
+	.power_off = cdns_dphy_tx_power_off,
+	.validate = cdns_dphy_tx_validate,
+	.configure = cdns_dphy_tx_configure,
+	.get_wakeup_time_ns = cdns_dphy_ref_get_wakeup_time_ns,
+	.set_pll_cfg = cdns_dphy_ref_set_pll_cfg,
+	.set_psm_div = cdns_dphy_ref_set_psm_div,
+};
+
+/*
+ * This is the reference implementation of DPHY hooks. Specific integration of
+ * this IP may have to re-implement some of them depending on how they decided
+ * to wire things in the SoC.
+ */
+static const struct cdns_dphy_driver_data ref_dphy_ops = {
+	.tx = &tx_ref_dphy_ops,
+};
+
+static int cdns_dphy_validate(struct phy *phy, enum phy_mode mode, int submode,
+			      union phy_configure_opts *opts)
+{
+	struct cdns_dphy *dphy = phy_get_drvdata(phy);
+
+	if (mode != PHY_MODE_MIPI_DPHY)
+		return -EINVAL;
+
+	if (dphy->ops->validate)
+		return dphy->ops->validate(dphy, mode, submode, opts);
+
+	return 0;
+}
+
+static int cdns_dphy_power_on(struct phy *phy)
+{
+	struct cdns_dphy *dphy = phy_get_drvdata(phy);
+
+	if (dphy->ops->power_on)
+		return dphy->ops->power_on(dphy);
+
+	return 0;
+}
+
+static int cdns_dphy_power_off(struct phy *phy)
+{
+	struct cdns_dphy *dphy = phy_get_drvdata(phy);
+
+	if (dphy->ops->power_off)
+		return dphy->ops->power_off(dphy);
+
+	return 0;
+}
+
+static int cdns_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
+{
+	struct cdns_dphy *dphy = phy_get_drvdata(phy);
+
+	if (dphy->ops->configure)
+		return dphy->ops->configure(dphy, opts);
+
+	return 0;
+}
+
 static const struct phy_ops cdns_dphy_ops = {
 	.configure	= cdns_dphy_configure,
 	.validate	= cdns_dphy_validate,
@@ -314,14 +376,20 @@ static int cdns_dphy_probe(struct platform_device *pdev)
 {
 	struct phy_provider *phy_provider;
 	struct cdns_dphy *dphy;
+	const struct cdns_dphy_driver_data *ddata;
 	int ret;
 
 	dphy = devm_kzalloc(&pdev->dev, sizeof(*dphy), GFP_KERNEL);
 	if (!dphy)
 		return -ENOMEM;
 	dev_set_drvdata(&pdev->dev, dphy);
+	dphy->dev = &pdev->dev;
 
-	dphy->ops = of_device_get_match_data(&pdev->dev);
+	ddata = of_device_get_match_data(&pdev->dev);
+	if (!ddata)
+		return -EINVAL;
+
+	dphy->ops = ddata->tx;
 	if (!dphy->ops)
 		return -EINVAL;
 
@@ -329,11 +397,11 @@ static int cdns_dphy_probe(struct platform_device *pdev)
 	if (IS_ERR(dphy->regs))
 		return PTR_ERR(dphy->regs);
 
-	dphy->psm_clk = devm_clk_get(&pdev->dev, "psm");
+	dphy->psm_clk = devm_clk_get_optional(dphy->dev, "psm");
 	if (IS_ERR(dphy->psm_clk))
 		return PTR_ERR(dphy->psm_clk);
 
-	dphy->pll_ref_clk = devm_clk_get(&pdev->dev, "pll_ref");
+	dphy->pll_ref_clk = devm_clk_get_optional(dphy->dev, "pll_ref");
 	if (IS_ERR(dphy->pll_ref_clk))
 		return PTR_ERR(dphy->pll_ref_clk);
 
-- 
2.30.0


  parent reply	other threads:[~2021-06-24 18:41 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-24 18:41 [PATCH v3 0/7] Rx mode support for Cadence DPHY Pratyush Yadav
2021-06-24 18:41 ` [PATCH v3 1/7] phy: Distinguish between Rx and Tx for MIPI D-PHY with submodes Pratyush Yadav
2021-08-06 11:11   ` Paul Kocialkowski
2021-08-11 17:36     ` Pratyush Yadav
2021-06-24 18:41 ` Pratyush Yadav [this message]
2021-08-06 10:18   ` [PATCH v3 2/7] phy: cdns-dphy: Prepare for Rx support Vinod Koul
2021-08-11 17:39     ` Pratyush Yadav
2021-06-24 18:41 ` [PATCH v3 3/7] phy: cdns-dphy: Allow setting mode Pratyush Yadav
2021-06-24 18:41 ` [PATCH v3 4/7] phy: cdns-dphy: Add Rx support Pratyush Yadav
2021-08-06 11:15   ` Vinod Koul
2021-08-11 17:33     ` Pratyush Yadav
2021-06-24 18:41 ` [PATCH v3 5/7] phy: dt-bindings: Convert Cadence DPHY binding to YAML Pratyush Yadav
2021-06-24 18:41 ` [PATCH v3 6/7] phy: dt-bindings: cdns,dphy: make clocks optional Pratyush Yadav
2021-06-24 18:41 ` [PATCH v3 7/7] phy: dt-bindings: cdns,dphy: add power-domains property Pratyush Yadav

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210624184108.21312-3-p.yadav@ti.com \
    --to=p.yadav@ti.com \
    --cc=chunfeng.yun@mediatek.com \
    --cc=kishon@ti.com \
    --cc=laurent.pinchart@ideasonboard.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-phy@lists.infradead.org \
    --cc=nikhil.nd@ti.com \
    --cc=paul.kocialkowski@bootlin.com \
    --cc=peter.chen@nxp.com \
    --cc=tomi.valkeinen@ideasonboard.com \
    --cc=vigneshr@ti.com \
    --cc=vkoul@kernel.org \
    --subject='Re: [PATCH v3 2/7] phy: cdns-dphy: Prepare for Rx support' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).