linux-kernel - Re: [PATCH v11 2/6] dt-bindings: display/msm: dp-controller: document QCS8300 compatible

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Message-ID: <d8aaff46-9e3b-4b53-a690-351253753edd@oss.qualcomm.com>
Date: Fri, 5 Sep 2025 10:50:33 +0800
From: Yongxing Mou <yongxing.mou@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar
 <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.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>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Bjorn Andersson <andersson@...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
Subject: Re: [PATCH v11 2/6] dt-bindings: display/msm: dp-controller: document
 QCS8300 compatible



On 9/4/2025 9:43 PM, Dmitry Baryshkov wrote:
> On Thu, Sep 04, 2025 at 03:22:37PM +0800, Yongxing Mou wrote:
>> Add compatible string for the DisplayPort controller found on the
>> Qualcomm QCS8300 SoC.
>>
>> The Qualcomm QCS8300 platform comes with one DisplayPort controller
>> that supports 4 MST streams.
>>
>> Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
>> ---
>>   .../bindings/display/msm/dp-controller.yaml        | 22 ++++++++++++++++++++++
>>   1 file changed, 22 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
>> index aeb4e4f36044a0ff1e78ad47b867e232b21df509..ad08fd11588c45698f7e63ecc3218a749fc8ca67 100644
>> --- a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
>> +++ b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
>> @@ -18,6 +18,7 @@ properties:
>>     compatible:
>>       oneOf:
>>         - enum:
>> +          - qcom,qcs8300-dp
> 
> Can we use fallback to qcom,sa8775p-dp instead of declaring a completely
> new one?
> 
I think we can not use fallback to sa8775p, since we don't have DP1 
controller for QCS8300. SA8775P actually have 4 DP controllers (now only 
2 really used). So in the hardware, i think it is different with SA8775P 
and we need a new one.>>             - qcom,sa8775p-dp
>>             - qcom,sc7180-dp
>>             - qcom,sc7280-dp
>> @@ -195,6 +196,7 @@ allOf:
>>             compatible:
>>               contains:
>>                 enum:
>> +                - qcom,qcs8300-dp
>>                   - qcom,sa8775p-dp
>>                   - qcom,x1e80100-dp
>>         then:
>> @@ -295,6 +297,26 @@ allOf:
>>             minItems: 6
>>             maxItems: 8
>>   
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            enum:
>> +              # QCS8300 only has one DP controller that supports 4
>> +              # streams MST.
>> +              - qcom,qcs8300-dp
>> +    then:
>> +      properties:
>> +        reg:
>> +          minItems: 9
>> +          maxItems: 9
>> +        clocks:
>> +          minItems: 8
>> +          maxItems: 8
>> +        clocks-names:
>> +          minItems: 8
>> +          maxItems: 8
>> +
>>   additionalProperties: false
>>   
>>   examples:
>>
>> -- 
>> 2.34.1
>>
>