linux-kernel - Re: [PATCH v3 01/15] dt-bindings: display/msm: gpu: Document GMU wrapper-equipped A6xx

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Message-ID: <a28c4e67-78b4-21b5-7094-9953316576b2@linaro.org>
Date:   Fri, 24 Feb 2023 12:51:22 +0100
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>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>
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, Rob Clark <robdclark@...omium.org>
Subject: Re: [PATCH v3 01/15] dt-bindings: display/msm: gpu: Document GMU
 wrapper-equipped A6xx



On 24.02.2023 12:17, Krzysztof Kozlowski wrote:
> On 23/02/2023 13:06, Konrad Dybcio wrote:
>> GMU wrapper-equipped A6xx GPUs require clocks and clock-names to be
>> specified under the GPU node, just like their older cousins.
>> Account for that.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  .../devicetree/bindings/display/msm/gpu.yaml       | 63 ++++++++++++++++++----
>>  1 file changed, 53 insertions(+), 10 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/display/msm/gpu.yaml b/Documentation/devicetree/bindings/display/msm/gpu.yaml
>> index d4191cca71fb..e6d3160601bc 100644
>> --- a/Documentation/devicetree/bindings/display/msm/gpu.yaml
>> +++ b/Documentation/devicetree/bindings/display/msm/gpu.yaml
>> @@ -36,10 +36,7 @@ properties:
>>  
>>    reg-names:
>>      minItems: 1
>> -    items:
>> -      - const: kgsl_3d0_reg_memory
>> -      - const: cx_mem
>> -      - const: cx_dbgc
>> +    maxItems: 3
>>  
>>    interrupts:
>>      maxItems: 1
>> @@ -147,26 +144,72 @@ allOf:
>>                  description: GPU Alternative Memory Interface clock
>>                - const: gfx3d
>>                  description: GPU 3D engine clock
>> +              - const: gmu
>> +                description: CX GMU clock
>>                - const: rbbmtimer
>>                  description: GPU RBBM Timer for Adreno 5xx series
>>                - const: rbcpr
>>                  description: GPU RB Core Power Reduction clock
>> +              - const: xo
>> +                description: GPUCC clocksource clock
>>            minItems: 2
>> -          maxItems: 7
>> +          maxItems: 9
> 
> Your commit says A6xx but this is a3-5xx. I don't understand this change.
Right, it's a leftover unrelated hunk. I'll remove it.

> 
>>  
>>        required:
>>          - clocks
>>          - clock-names
>> +
>>    - if:
>>        properties:
>>          compatible:
>>            contains:
>> -            pattern: '^qcom,adreno-6[0-9][0-9]\.[0-9]$'
>> -
>> -    then: # Since Adreno 6xx series clocks should be defined in GMU
>> +            enum:
>> +              - qcom,adreno-610.0
>> +              - qcom,adreno-619.1
>> +    then:
>>        properties:
>> -        clocks: false
>> -        clock-names: false
>> +        clock-names:
>> +          items:
>> +            - const: core
>> +              description: GPU Core clock
>> +            - const: iface
>> +              description: GPU Interface clock
>> +            - const: mem_iface
>> +              description: GPU Memory Interface clock
>> +            - const: alt_mem_iface
>> +              description: GPU Alternative Memory Interface clock
>> +            - const: gmu
>> +              description: CX GMU clock
>> +            - const: xo
>> +              description: GPUCC clocksource clock
>> +
>> +        reg-names:
>> +          minItems: 1
>> +          items:
>> +            - const: kgsl_3d0_reg_memory
>> +            - const: cx_dbgc
>> +
>> +      required:
>> +        - clocks
>> +        - clock-names
>> +    else:
>> +      if:
>> +        properties:
>> +          compatible:
>> +            contains:
>> +              pattern: '^qcom,adreno-6[0-9][0-9]\.[0-9]$'
>> +
>> +      then: # Starting with A6xx, the clocks are usually defined in the GMU node
> 
> The comment is not accurate anymore.
I'll argue the semantics, they are still "usually" defined
in the GMU node..

Konrad
> 
> 
> Best regards,
> Krzysztof
>