linux-kernel - [PATCH v10 04/11] drm/bridge: aux: Add drm_aux_bridge_register_from

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Message-Id: <20251120022343.250-5-kernel@airkyi.com>
Date: Thu, 20 Nov 2025 10:23:36 +0800
From: Chaoyi Chen <kernel@...kyi.com>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Peter Chen <hzpeterchen@...il.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Sandy Huang <hjc@...k-chips.com>,
	Andy Yan <andy.yan@...k-chips.com>,
	Yubing Zhang <yubing.zhang@...k-chips.com>,
	Frank Wang <frank.wang@...k-chips.com>,
	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>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Amit Sunil Dhamne <amitsd@...gle.com>,
	Chaoyi Chen <chaoyi.chen@...k-chips.com>,
	Dragan Simic <dsimic@...jaro.org>,
	Johan Jonker <jbx6244@...il.com>,
	Diederik de Haas <didi.debian@...ow.org>,
	Peter Robinson <pbrobinson@...il.com>
Cc: linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-phy@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH v10 04/11] drm/bridge: aux: Add drm_aux_bridge_register_from_node()

From: Chaoyi Chen <chaoyi.chen@...k-chips.com>

The drm_aux_bridge_register() uses the device->of_node as the
bridge->of_node.

This patch adds drm_aux_bridge_register_from_node() to allow
specifying the of_node corresponding to the bridge.

Signed-off-by: Chaoyi Chen <chaoyi.chen@...k-chips.com>
---
 drivers/gpu/drm/bridge/aux-bridge.c | 24 ++++++++++++++++++++++--
 include/drm/bridge/aux-bridge.h     |  6 ++++++
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/aux-bridge.c b/drivers/gpu/drm/bridge/aux-bridge.c
index b3e4cdff61d6..52dff4601c2d 100644
--- a/drivers/gpu/drm/bridge/aux-bridge.c
+++ b/drivers/gpu/drm/bridge/aux-bridge.c
@@ -35,6 +35,7 @@ static void drm_aux_bridge_unregister_adev(void *_adev)
 /**
  * drm_aux_bridge_register - Create a simple bridge device to link the chain
  * @parent: device instance providing this bridge
+ * @np: device node pointer corresponding to this bridge instance
  *
  * Creates a simple DRM bridge that doesn't implement any drm_bridge
  * operations. Such bridges merely fill a place in the bridge chain linking
@@ -42,7 +43,7 @@ static void drm_aux_bridge_unregister_adev(void *_adev)
  *
  * Return: zero on success, negative error code on failure
  */
-int drm_aux_bridge_register(struct device *parent)
+int drm_aux_bridge_register_from_node(struct device *parent, struct device_node *np)
 {
 	struct auxiliary_device *adev;
 	int ret;
@@ -62,7 +63,10 @@ int drm_aux_bridge_register(struct device *parent)
 	adev->dev.parent = parent;
 	adev->dev.release = drm_aux_bridge_release;
 
-	device_set_of_node_from_dev(&adev->dev, parent);
+	if (np)
+		device_set_node(&adev->dev, of_fwnode_handle(np));
+	else
+		device_set_of_node_from_dev(&adev->dev, parent);
 
 	ret = auxiliary_device_init(adev);
 	if (ret) {
@@ -80,6 +84,22 @@ int drm_aux_bridge_register(struct device *parent)
 
 	return devm_add_action_or_reset(parent, drm_aux_bridge_unregister_adev, adev);
 }
+EXPORT_SYMBOL_GPL(drm_aux_bridge_register_from_node);
+
+/**
+ * drm_aux_bridge_register - Create a simple bridge device to link the chain
+ * @parent: device instance providing this bridge
+ *
+ * Creates a simple DRM bridge that doesn't implement any drm_bridge
+ * operations. Such bridges merely fill a place in the bridge chain linking
+ * surrounding DRM bridges.
+ *
+ * Return: zero on success, negative error code on failure
+ */
+int drm_aux_bridge_register(struct device *parent)
+{
+	return drm_aux_bridge_register_from_node(parent, NULL);
+}
 EXPORT_SYMBOL_GPL(drm_aux_bridge_register);
 
 struct drm_aux_bridge_data {
diff --git a/include/drm/bridge/aux-bridge.h b/include/drm/bridge/aux-bridge.h
index c2f5a855512f..7dd1f17a1354 100644
--- a/include/drm/bridge/aux-bridge.h
+++ b/include/drm/bridge/aux-bridge.h
@@ -13,11 +13,17 @@ struct auxiliary_device;
 
 #if IS_ENABLED(CONFIG_DRM_AUX_BRIDGE)
 int drm_aux_bridge_register(struct device *parent);
+int drm_aux_bridge_register_from_node(struct device *parent, struct device_node *np);
 #else
 static inline int drm_aux_bridge_register(struct device *parent)
 {
 	return 0;
 }
+
+static inline int drm_aux_bridge_register_from_node(struct device *parent, struct device_node *np)
+{
+	return 0;
+}
 #endif
 
 #if IS_ENABLED(CONFIG_DRM_AUX_HPD_BRIDGE)
-- 
2.51.1