linux-kernel - Re: [PATCH] drm/bridge: Mark the of_node of the aux bridge device as reused

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Message-ID: <ZxE42DvdBwrOnaEa@hovoldconsulting.com>
Date: Thu, 17 Oct 2024 18:18:32 +0200
From: Johan Hovold <johan@...nel.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: 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>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: Mark the of_node of the aux bridge device as
 reused

On Thu, Oct 17, 2024 at 06:35:26PM +0300, Abel Vesa wrote:
> There are some cases where sharing the of_node renders different resources
> providers confused about the same resource being shared by two different
> devices.

Can you be more specific about what type of issue you are trying to
avoid here? Is it due to pinctrl for example?

> Avoid that by marking the of_node as reused since the aux bridge
> device is reusing the parent of_node.
>
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
>  drivers/gpu/drm/bridge/aux-bridge.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/bridge/aux-bridge.c b/drivers/gpu/drm/bridge/aux-bridge.c
> index b29980f95379ec7af873ed6e0fb79a9abb663c7b..ec3299ae49d6abdb75ee98acfe0682f1acc459f8 100644
> --- a/drivers/gpu/drm/bridge/aux-bridge.c
> +++ b/drivers/gpu/drm/bridge/aux-bridge.c
> @@ -60,6 +60,7 @@ int drm_aux_bridge_register(struct device *parent)
>  	adev->dev.parent = parent;
>  	adev->dev.of_node = of_node_get(parent->of_node);
>  	adev->dev.release = drm_aux_bridge_release;
> +	adev->dev.of_node_reused = true;

Please use the intended device_set_of_node_from_dev() helper for this.
  
>  	ret = auxiliary_device_init(adev);
>  	if (ret) {

Johan