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

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Message-ID: <7d2554e2-bc69-48c3-89c7-deb701d8a12b@mailbox.org>
Date: Sat, 17 Jan 2026 01:05:24 +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 1/16/26 4:26 AM, Rob Herring wrote:
> 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"?
It could, but then, if I am already patching that panel-simple driver, I 
can also simply include the timings in it, just like many other panels do.