linux-kernel - Re: [PATCH v3 1/5] dt-bindings: display: msm: dp-controller: document SM8450 compatible

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Date:   Fri, 10 Feb 2023 16:27:29 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v3 1/5] dt-bindings: display: msm: dp-controller: document
 SM8450 compatible

On 10/02/2023 16:16, Dmitry Baryshkov wrote:
> On 10/02/2023 16:44, Neil Armstrong wrote:
>> The SM8450 & SM350 shares the same DT TX IP version, use the
>> SM8350 compatible as fallback for SM8450.
>>
>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
>> ---
>>   .../bindings/display/msm/dp-controller.yaml        | 25 +++++++++++++---------
>>   1 file changed, 15 insertions(+), 10 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
>> index 0e8d8df686dc..f0c2237d5f82 100644
>> --- a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
>> +++ b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
>> @@ -15,16 +15,21 @@ description: |
>>   properties:
>>     compatible:
>> -    enum:
>> -      - qcom,sc7180-dp
>> -      - qcom,sc7280-dp
>> -      - qcom,sc7280-edp
>> -      - qcom,sc8180x-dp
>> -      - qcom,sc8180x-edp
>> -      - qcom,sc8280xp-dp
>> -      - qcom,sc8280xp-edp
>> -      - qcom,sdm845-dp
>> -      - qcom,sm8350-dp
>> +    oneOf:
>> +      - enum:
>> +          - qcom,sc7180-dp
>> +          - qcom,sc7280-dp
>> +          - qcom,sc7280-edp
>> +          - qcom,sc8180x-dp
>> +          - qcom,sc8180x-edp
>> +          - qcom,sc8280xp-dp
>> +          - qcom,sc8280xp-edp
>> +          - qcom,sdm845-dp
>> +          - qcom,sm8350-dp
>> +      - items:
>> +          - enum:
>> +              - qcom,sm8450-dp
>> +          - const: qcom,sm8350-dp
> 
> Neil, Krzysztof, I'm not convinced that this is worth all the troubles. I think it would be easier to have a flat list of compatibles and handle all the differences inside the driver. For example, for sdm845 we simply reused sc7180 config internally, while keeping separate compatible strings.

Sure, but the doc reports the SM8350, SM8450 and SM550 has the exact same IP version, isn't fallback for that cat ?

> 
>>     reg:
>>       minItems: 4
>>
>