Re: [PATCH v4 01/14] dt-bindings: display/msm: gpu: Document GMU wrapper-equipped A6xx

[Krzysztof Kozlowski]

On 14/03/2023 16:28, Konrad Dybcio wrote:
> The "GMU Wrapper" is Qualcomm's name for "let's treat the GPU blocks
> we'd normally assign to the GMU as if they were a part of the GMU, even
> though they are not". It's a (good) software representation of the GMU_CX
> and GMU_GX register spaces within the GPUSS that helps us programatically
> treat these de-facto GMU-less parts in a way that's very similar to their
> GMU-equipped cousins, massively saving up on code duplication.
> 
> The "wrapper" register space was specifically designed to mimic the layout
> of a real GMU, though it rather obviously does not have the M3 core et al.
> 
> 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@xxxxxxxxxx>
> ---
>  .../devicetree/bindings/display/msm/gpu.yaml       | 57 ++++++++++++++++++----
>  1 file changed, 48 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/gpu.yaml b/Documentation/devicetree/bindings/display/msm/gpu.yaml
> index d4191cca71fb..ac1a9bce2042 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
> @@ -157,16 +154,58 @@ allOf:
>        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

Since you require fixed number of clocks, you also need:

clocks:
  minItems: 6
  maxItems: 6

Best regards,
Krzysztof