linux-kernel - Re: [PATCH v7 15/16] dt-bindings: display: mediatek: split: add compatible for MT8195

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Message-ID: <b1f42bab-7670-c099-8c7a-882f7268b358@collabora.com>
Date:   Mon, 16 Oct 2023 10:01:17 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Moudy Ho <moudy.ho@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v7 15/16] dt-bindings: display: mediatek: split: add
 compatible for MT8195

Il 13/10/23 08:52, Krzysztof Kozlowski ha scritto:
> On 12/10/2023 10:40, Moudy Ho wrote:
>> Add compatible string and GCE property for MT8195 SPLIT, of
>> which is operated by MDP3.
>>
>> Signed-off-by: Moudy Ho <moudy.ho@...iatek.com>
> 
> 
>> +allOf:
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            const: mediatek,mt8195-mdp3-split
>> +
>> +    then:
>> +      required:
>> +        - mediatek,gce-client-reg
> 
> else:
>    mediatek,gce-client-reg: false
> 
> 

Technically, all of the display components do support GCE, using it is
a matter of preference, so disallowing gce-client-reg on anything that
is not mt8195-mdp3-split is *technically* wrong, as much as not having
that from the beginning was also technically wrong... :-)

P.S.: The driver for the display split component doesn't use GCE yet,
only mdp3 for now, but again, it's the driver - while the HW is actually
capable of using that

Cheers,
Angelo

>> +
>>   additionalProperties: false
>>   
>>   examples:
> 
> Best regards,
> Krzysztof
>