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

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Message-ID: <85ff0eb2-d942-4f85-8f1d-c5982bd31bec@mailbox.org>
Date: Thu, 15 Jan 2026 20:20:03 +0100
From: Marek Vasut <marek.vasut@...lbox.org>
To: Rob Herring <robh@...nel.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 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 ?

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 ?