linux-kernel - Re: [PATCH v3 03/12] dt-bindings: display/msm: sc7180-dpu: Describe SM6350 and SM6375

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Message-ID: <faa64d3d-48bd-b6db-535e-05d6d50aebd7@linaro.org>
Date:   Mon, 8 May 2023 10:38:47 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        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>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.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, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux.dev
Subject: Re: [PATCH v3 03/12] dt-bindings: display/msm: sc7180-dpu: Describe
 SM6350 and SM6375



On 7.05.2023 10:14, Krzysztof Kozlowski wrote:
> On 05/05/2023 23:40, Konrad Dybcio wrote:
>> SC7180, SM6350 and SM6375 use a rather similar hw setup for DPU, with
>> the main exception being that the last one requires an additional
>> throttle clock.
>>
>> It is not well understood yet, but failing to toggle it on makes the
>> display hardware stall and not output any frames.
>>
>> Document SM6350 and SM6375 DPU.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  .../bindings/display/msm/qcom,sc7180-dpu.yaml      | 23 +++++++++++++++++++++-
>>  1 file changed, 22 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/display/msm/qcom,sc7180-dpu.yaml b/Documentation/devicetree/bindings/display/msm/qcom,sc7180-dpu.yaml
>> index 1fb8321d9ee8..630b11480496 100644
>> --- a/Documentation/devicetree/bindings/display/msm/qcom,sc7180-dpu.yaml
>> +++ b/Documentation/devicetree/bindings/display/msm/qcom,sc7180-dpu.yaml
>> @@ -13,7 +13,10 @@ $ref: /schemas/display/msm/dpu-common.yaml#
>>  
>>  properties:
>>    compatible:
>> -    const: qcom,sc7180-dpu
>> +    enum:
>> +      - qcom,sc7180-dpu
>> +      - qcom,sm6350-dpu
>> +      - qcom,sm6375-dpu
>>  
>>    reg:
>>      items:
>> @@ -26,6 +29,7 @@ properties:
>>        - const: vbif
>>  
>>    clocks:
>> +    minItems: 6
>>      items:
>>        - description: Display hf axi clock
>>        - description: Display ahb clock
>> @@ -33,8 +37,10 @@ properties:
>>        - description: Display lut clock
>>        - description: Display core clock
>>        - description: Display vsync clock
>> +      - description: Display core throttle clock
>>  
>>    clock-names:
>> +    minItems: 6
>>      items:
>>        - const: bus
>>        - const: iface
>> @@ -42,6 +48,7 @@ properties:
>>        - const: lut
>>        - const: core
>>        - const: vsync
>> +      - const: throttle
>>  
>>  required:
>>    - compatible
>> @@ -52,6 +59,20 @@ required:
>>  
>>  unevaluatedProperties: false
>>  
>> +allOf:
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          const: qcom,sm6375-dpu
> 
> And the two other variants? Is the clock valid there or not? If not
> really, then you should have else: with maxItems: 6.
Oh right!

> 
>> +
>> +    then:
>> +      properties:
>> +        clocks:
>> +          minItems: 7
>> +
>> +        clock-names:
>> +          minItems: 7
> 
> If there is going new version - put allOf: before
> unevaluatedProperties:. Otherwise it is fine.
Thanks!

Konrad
> 
>> +
>>  examples:
>>    - |
>>      #include <dt-bindings/clock/qcom,dispcc-sc7180.h>
>>
> 
> Best regards,
> Krzysztof
>