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

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Date:   Sat, 11 Feb 2023 12:38:26 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     neil.armstrong@...aro.org,
        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
Subject: Re: [PATCH v3 1/5] dt-bindings: display: msm: dp-controller: document
 SM8450 compatible

On 10/02/2023 16:27, Neil Armstrong wrote:
> 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 ?

Exactly.

What's the trouble with the list Neil created?

Best regards,
Krzysztof