linux-kernel - Re: [PATCH 4/6] drm/mcde: dsi: convert to of_drm_find_and_get

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Message-ID: <CAD++jLmriwfBaMKGP=-pOZyCnHZt78RKKURmOXuyNSTZz5geWQ@mail.gmail.com>
Date: Mon, 19 Jan 2026 09:57:45 +0100
From: Linus Walleij <linusw@...nel.org>
To: Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc: Biju Das <biju.das.jz@...renesas.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>, 
	Anitha Chrisanthus <anitha.chrisanthus@...el.com>, Edmund Dea <edmund.j.dea@...el.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>, 
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, Hui Pu <Hui.Pu@...ealthcare.com>, 
	Ian Ray <ian.ray@...ealthcare.com>, Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
	dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] drm/mcde: dsi: convert to of_drm_find_and_get_bridge()

On Fri, Jan 16, 2026 at 6:33 PM Luca Ceresoli <luca.ceresoli@...tlin.com> wrote:

> of_drm_find_bridge() is deprecated. Move to its replacement
> of_drm_find_and_get_bridge() which gets a bridge reference, and ensure it
> is put when done.
>
> We need to handle the two cases: when a panel is found and when it isn't,
> even though the latter is not supported. So:
>
>  * in case a panel is not found and bridge is, get a reference to the
>    found bridge
>  * in case a panel is found, get a reference to the panel_bridge when it
>    is added, so the following code always get exactly one reference that
>    it needs to put
>
> Finally, use the next_bridge pointer in struct drm_bridge in order to
> simplify putting the reference.
>
> Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>

I do not understand the change as a whole but the approach
looks sane so:
Acked-by: Linus Walleij <linusw@...nel.org>

Yours,
Linus Walleij