linux-kernel - Re: [PATCH v2 1/7] dt-bindings: panel: Add Samsung S6E3FC2X01 DDIC with panel

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Message-ID: <74893f76-1b7d-4cfb-ba7a-9fd64427762b@oss.qualcomm.com>
Date: Thu, 9 Oct 2025 10:51:31 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, david@...t.cz
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
        Jessica Zhang <jessica.zhang@....qualcomm.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>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Thierry Reding
 <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Casey Connolly <casey.connolly@...aro.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        phone-devel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] dt-bindings: panel: Add Samsung S6E3FC2X01 DDIC
 with panel

On 10/8/25 8:57 PM, Dmitry Baryshkov wrote:
> On Wed, Oct 08, 2025 at 04:05:28PM +0200, David Heidelberg via B4 Relay wrote:
>> From: David Heidelberg <david@...t.cz>
>>
>> Basic description for S6E3FC2X01 DDIC with attached panel AMS641RW.
>>
>> Samsung AMS641RW is 6.41 inch, 1080x2340 pixels, 19.5:9 ratio panel
>>
>> Signed-off-by: David Heidelberg <david@...t.cz>
>> ---
>>  .../bindings/display/panel/samsung,s6e3fc2x01.yaml | 78 ++++++++++++++++++++++
>>  MAINTAINERS                                        |  5 ++
>>  2 files changed, 83 insertions(+)
>>
> 
> Please also describe, why it's not enough to use defined compatible,
> samsung,s6e3fc2x01. Why do we need a separate schema and can't use the
> panel-simple-dsi.yaml

panel-simple works for 'dumb' (perhaps a harsh word for 'made with
just the in-spec DCS commands in mind') panels, but Samsungs are
widely known to require a ton of vendor magic

Perhaps the original change was made with an "oh it just works
surely there's no drawbacks possible" attitude, as the panel
was left initialized by the bootloader

Konrad