linux-kernel - Re: [PATCH 1/2] dt-bindings: display: panel: Fork Waveshare panels into separate document

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Message-ID: <CAL_Jsq+ELqDhPHeSL=Hybaihmj3QbXt3VmrJ2tC8iXvdoVFNfQ@mail.gmail.com>
Date: Thu, 15 Jan 2026 21:26:42 -0600
From: Rob Herring <robh@...nel.org>
To: Marek Vasut <marek.vasut@...lbox.org>
Cc: linux-arm-kernel@...ts.infradead.org, Conor Dooley <conor+dt@...nel.org>, 
	David Airlie <airlied@...il.com>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	Jessica Zhang <jesszhan0024@...il.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Magnus Damm <magnus.damm@...il.com>, 
	Maxime Ripard <mripard@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>, 
	Sam Ravnborg <sam@...nborg.org>, Simona Vetter <simona@...ll.ch>, 
	Thierry Reding <thierry.reding@...il.com>, Thomas Zimmermann <tzimmermann@...e.de>, 
	devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: display: panel: Fork Waveshare panels
 into separate document

On Thu, Jan 15, 2026 at 1:20 PM Marek Vasut <marek.vasut@...lbox.org> wrote:
>
> On 1/15/26 6:40 PM, Rob Herring wrote:
> > On Tue, Jan 13, 2026 at 01:05:30AM +0100, Marek Vasut wrote:
> >> Move the Waveshare panels description into separate document, so they
> >> can be properly described with compatible = "waveshare,...", "panel-dpi"
> >> and attached to "waveshare,dsi2dpi" bridge.
> >
> > But why do we need "panel-dpi"? Adding that requires changing a DT.
> > Can't you make the kernel handle these compatible strings as a
> > "panel-dpi" without the compatible?
> I can, but wouldn't we then miss the more specific compatible strings in
> the DT ?
>
> compatible = "waveshare,13.3inch-panel", "panel-dpi";
>               ^^^^^^^^^^^^^^^^^^^^^^^^^^
>               this ... would be removed. Do we want that ?

No, drop "panel-dpi". Or really, don't add it.

>
> The other option would be to add the timings into panel-simple driver,
> then we wouldn't have to change the bindings at all. Maybe that would be
> preferable ?

Why can't the "panel-dpi" driver match to"waveshare,13.3inch-panel"?

Rob