LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Maxime Ripard <maxime@cerno.tech>
To: Jonas Karlman <jonas@kwiboo.se>, Sam Ravnborg <sam@ravnborg.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Daniel Vetter <daniel.vetter@intel.com>,
	David Airlie <airlied@linux.ie>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Maxime Ripard <maxime@cerno.tech>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Robert Foss <robert.foss@linaro.org>,
	Andrzej Hajda <a.hajda@samsung.com>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: [PATCH v3 3/8] drm/mipi-dsi: Create devm device registration
Date: Mon, 23 Aug 2021 10:47:18 +0200	[thread overview]
Message-ID: <20210823084723.1493908-4-maxime@cerno.tech> (raw)
In-Reply-To: <20210823084723.1493908-1-maxime@cerno.tech>

Devices that take their data through the MIPI-DSI bus but are controlled
through a secondary bus like I2C have to register a secondary device on
the MIPI-DSI bus through the mipi_dsi_device_register_full() function.

At removal or when an error occurs, that device needs to be removed
through a call to mipi_dsi_device_unregister().

Let's create a device-managed variant of the registration function that
will automatically unregister the device at unbind.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 46 ++++++++++++++++++++++++++++++++++
 include/drm/drm_mipi_dsi.h     |  3 +++
 2 files changed, 49 insertions(+)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 5dd475e82995..ddf67463eaa1 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -246,6 +246,52 @@ void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi)
 }
 EXPORT_SYMBOL(mipi_dsi_device_unregister);
 
+static void devm_mipi_dsi_device_unregister(void *arg)
+{
+	struct mipi_dsi_device *dsi = arg;
+
+	mipi_dsi_device_unregister(dsi);
+}
+
+/**
+ * devm_mipi_dsi_device_register_full - create a managed MIPI DSI device
+ * @dev: device to tie the MIPI-DSI device lifetime to
+ * @host: DSI host to which this device is connected
+ * @info: pointer to template containing DSI device information
+ *
+ * Create a MIPI DSI device by using the device information provided by
+ * mipi_dsi_device_info template
+ *
+ * This is the managed version of mipi_dsi_device_register_full() which
+ * automatically calls mipi_dsi_device_unregister() when @dev is
+ * unbound.
+ *
+ * Returns:
+ * A pointer to the newly created MIPI DSI device, or, a pointer encoded
+ * with an error
+ */
+struct mipi_dsi_device *
+devm_mipi_dsi_device_register_full(struct device *dev,
+				   struct mipi_dsi_host *host,
+				   const struct mipi_dsi_device_info *info)
+{
+	struct mipi_dsi_device *dsi;
+	int ret;
+
+	dsi = mipi_dsi_device_register_full(host, info);
+	if (IS_ERR(dsi))
+		return dsi;
+
+	ret = devm_add_action_or_reset(dev,
+				       devm_mipi_dsi_device_unregister,
+				       dsi);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return dsi;
+}
+EXPORT_SYMBOL_GPL(devm_mipi_dsi_device_register_full);
+
 static DEFINE_MUTEX(host_lock);
 static LIST_HEAD(host_list);
 
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index af7ba8071eb0..d0032e435e08 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -227,6 +227,9 @@ struct mipi_dsi_device *
 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
 			      const struct mipi_dsi_device_info *info);
 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi);
+struct mipi_dsi_device *
+devm_mipi_dsi_device_register_full(struct device *dev, struct mipi_dsi_host *host,
+				   const struct mipi_dsi_device_info *info);
 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
 int mipi_dsi_attach(struct mipi_dsi_device *dsi);
 int mipi_dsi_detach(struct mipi_dsi_device *dsi);
-- 
2.31.1


  parent reply	other threads:[~2021-08-23  8:49 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-23  8:47 [PATCH v3 0/8] drm/bridge: Make panel and bridge probe order consistent Maxime Ripard
2021-08-23  8:47 ` [PATCH v3 1/8] drm/bridge: Add documentation sections Maxime Ripard
2021-08-24  8:06   ` Andrzej Hajda
2021-08-23  8:47 ` [PATCH v3 2/8] drm/bridge: Document the probe issue with MIPI-DSI bridges Maxime Ripard
2021-08-23 16:32   ` Andrzej Hajda
2021-08-26  8:56     ` Maxime Ripard
2021-08-23  8:47 ` Maxime Ripard [this message]
2021-08-24 13:03   ` [PATCH v3 3/8] drm/mipi-dsi: Create devm device registration Andrzej Hajda
2021-08-23  8:47 ` [PATCH v3 4/8] drm/mipi-dsi: Create devm device attachment Maxime Ripard
2021-08-24 13:04   ` Andrzej Hajda
2021-08-23  8:47 ` [PATCH v3 5/8] drm/bridge: ps8640: Switch to devm MIPI-DSI helpers Maxime Ripard
2021-08-23  8:47 ` [PATCH v3 6/8] drm/bridge: ps8640: Register and attach our DSI device at probe Maxime Ripard
2021-08-24 13:14   ` Andrzej Hajda
2021-08-23  8:47 ` [PATCH v3 7/8] drm/bridge: sn65dsi83: Switch to devm MIPI-DSI helpers Maxime Ripard
2021-08-23  8:47 ` [PATCH v3 8/8] drm/bridge: sn65dsi83: Register and attach our DSI device at probe Maxime Ripard

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=20210823084723.1493908-4-maxime@cerno.tech \
    --to=maxime@cerno.tech \
    --cc=Laurent.pinchart@ideasonboard.com \
    --cc=a.hajda@samsung.com \
    --cc=airlied@linux.ie \
    --cc=daniel.vetter@intel.com \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=jernej.skrabec@gmail.com \
    --cc=jonas@kwiboo.se \
    --cc=linux-kernel@vger.kernel.org \
    --cc=maarten.lankhorst@linux.intel.com \
    --cc=narmstrong@baylibre.com \
    --cc=robert.foss@linaro.org \
    --cc=sam@ravnborg.org \
    --cc=thierry.reding@gmail.com \
    --cc=tzimmermann@suse.de \
    --subject='Re: [PATCH v3 3/8] drm/mipi-dsi: Create devm device registration' \
    /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).