linux-kernel - Re: [PATCH v6 1/4] dt-bindings: display: msm: Add SM6150 DisplayPort controller

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Message-ID: <f34c6aaa-f3c6-4171-89e4-9f44da9a6a94@oss.qualcomm.com>
Date: Tue, 28 Oct 2025 13:16:36 +0800
From: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar
 <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        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>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        fange.zhang@....qualcomm.com, yongxing.mou@....qualcomm.com,
        li.liu@....qualcomm.com
Subject: Re: [PATCH v6 1/4] dt-bindings: display: msm: Add SM6150 DisplayPort
 controller


On 10/28/2025 2:54 AM, Bjorn Andersson wrote:
> On Fri, Oct 24, 2025 at 01:21:01PM +0800, Xiangxu Yin via B4 Relay wrote:
>> From: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
>>
>> SM6150 uses the same DisplayPort controller as SM8150, which is already
>> compatible with SM8350. Add the SM6150-specific compatible string and
>> update the binding example accordingly.
>>
>> Signed-off-by: Xiangxu Yin <xiangxu.yin@....qualcomm.com>
>> ---
>>  .../devicetree/bindings/display/msm/qcom,sm6150-mdss.yaml      | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/msm/qcom,sm6150-mdss.yaml b/Documentation/devicetree/bindings/display/msm/qcom,sm6150-mdss.yaml
>> index 9ac24f99d3ada1c197c9654dc9babebccae972ed..ba0dea2edea98cee0826cf38b3f33361666e004a 100644
>> --- a/Documentation/devicetree/bindings/display/msm/qcom,sm6150-mdss.yaml
>> +++ b/Documentation/devicetree/bindings/display/msm/qcom,sm6150-mdss.yaml
>> @@ -51,6 +51,16 @@ patternProperties:
>>        compatible:
>>          const: qcom,sm6150-dpu
>>  
>> +  "^displayport-controller@[0-9a-f]+$":
>> +    type: object
>> +    additionalProperties: true
>> +    properties:
>> +      compatible:
>> +        items:
>> +          - const: qcom,sm6150-dp
>> +          - const: qcom,sm8150-dp
> Perhaps I'm missing something, but if sm6150-dp is the same controller
> as sm8150-dp, which is the same controller as sm8350-dp...doesn't that
> imply that sm6150-dp is the same as sm8350-dp and we could not mention
> the sm8150-dp here?
>
> Regards,
> Bjorn


I have discussed this with Dmitry in message-id 
<20250916-add-dp-controller-support-for-sm6150-v3-1-dd60ebbd101e@....qualcomm.com>
SM6150 uses the same controller IP as SM8150 and should fall back to sm8350 for
consistency.

And when running CHECK_DTBS, I encountered DTS compatible warnings, which is
why all three compatibles are listed.


>> +          - const: qcom,sm8350-dp
>> +
>>    "^dsi@[0-9a-f]+$":
>>      type: object
>>      additionalProperties: true
>>
>> -- 
>> 2.34.1
>>
>>