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

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Date:   Fri, 24 Feb 2023 12:17:55 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...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 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.

>  
>        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.


Best regards,
Krzysztof