Re: [PATCH v10 04/11] drm/bridge: aux: Add drm_aux_bridge_register_from_node()

[Neil Armstrong <neil.armstrong@linaro.org>]

On 11/20/25 03:23, Chaoyi Chen wrote:
> From: Chaoyi Chen <chaoyi.chen@rock-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@rock-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)

Looks fine:
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>