linux-kernel - [PATCH 02/26] drm/bridge: deprecate of_drm_find

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Message-Id: <20251119-drm-bridge-alloc-getput-drm_of_find_bridge-v1-2-0db98a7fe474@bootlin.com>
Date: Wed, 19 Nov 2025 14:05:33 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
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 Jonathan Corbet <corbet@....net>, Alexey Brodkin <abrodkin@...opsys.com>, 
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 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, 
 Adrien Grassein <adrien.grassein@...il.com>, 
 Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>, 
 Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>, 
 Kieran Bingham <kieran.bingham+renesas@...asonboard.com>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Magnus Damm <magnus.damm@...il.com>, Kevin Hilman <khilman@...libre.com>, 
 Jerome Brunet <jbrunet@...libre.com>, 
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>, 
 Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
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 Anitha Chrisanthus <anitha.chrisanthus@...el.com>, 
 Edmund Dea <edmund.j.dea@...el.com>, Inki Dae <inki.dae@...sung.com>, 
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 Kyungmin Park <kyungmin.park@...sung.com>, 
 Krzysztof Kozlowski <krzk@...nel.org>, 
 Alim Akhtar <alim.akhtar@...sung.com>
Cc: Hui Pu <Hui.Pu@...ealthcare.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-renesas-soc@...r.kernel.org, 
 linux-amlogic@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 linux-samsung-soc@...r.kernel.org, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH 02/26] drm/bridge: deprecate of_drm_find_bridge()

of_drm_find_bridge() does not increment the returned bridge
refcount. drm_of_find_bridge() is to be used as a replacement.

Suggested-by: Maxime Ripard <mripard@...nel.org>
Link: https://lore.kernel.org/dri-devel/20250319-stylish-lime-mongoose-0a18ad@houat/
Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---
 drivers/gpu/drm/drm_bridge.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index d98a7b4a83c0..6debbf20aaa8 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -299,7 +299,7 @@ EXPORT_SYMBOL(__devm_drm_bridge_alloc);
  * @bridge: bridge control structure
  *
  * Add the given bridge to the global list of bridges, where they can be
- * found by users via of_drm_find_bridge().
+ * found by users via drm_of_find_bridge().
  *
  * The bridge to be added must have been allocated by
  * devm_drm_bridge_alloc().
@@ -360,7 +360,7 @@ EXPORT_SYMBOL(devm_drm_bridge_add);
  * @bridge: bridge control structure
  *
  * Remove the given bridge from the global list of registered bridges, so
- * it won't be found by users via of_drm_find_bridge(), and add it to the
+ * it won't be found by users via drm_of_find_bridge(), and add it to the
  * lingering bridge list, to keep track of it until its allocated memory is
  * eventually freed.
  */
@@ -1452,6 +1452,9 @@ EXPORT_SYMBOL(drm_of_find_bridge);
  *
  * @np: device node
  *
+ * This function is deprecated. Use drm_of_find_bridge() instead for proper
+ * refcounting.
+ *
  * RETURNS:
  * drm_bridge control struct on success, NULL on failure
  */

-- 
2.51.1