Re: [PATCH v6 5/8] dt-bindings: gpu: img,powervr-rogue: Add TH1520 GPU compatible

[Matt Coster <Matt.Coster@imgtec.com>]

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On 23/06/2025 12:42, Michal Wilczynski wrote:
> Update the img,powervr-rogue.yaml to include the T-HEAD TH1520 SoC's
> specific GPU compatible string.
> 
> The thead,th1520-gpu compatible, along with its full chain
> img,img-bxm-4-64, and img,img-rogue, is added to the
> list of recognized GPU types.
> 
> The power-domains property requirement for img,img-bxm-4-64 is also
> ensured by adding it to the relevant allOf condition.
> 
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
> Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>
> ---
>  Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
> index 4450e2e73b3ccf74d29f0e31e2e6687d7cbe5d65..9b241a0c1f5941dc58a1e23970f6d3773d427c22 100644
> --- a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
> +++ b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
> @@ -21,6 +21,11 @@ properties:
>            # work with newer dts.
>            - const: img,img-axe
>            - const: img,img-rogue
> +      - items:
> +          - enum:
> +              - thead,th1520-gpu
> +          - const: img,img-bxm-4-64
> +          - const: img,img-rogue
>        - items:
>            - enum:
>                - ti,j721s2-gpu
> @@ -93,7 +98,9 @@ allOf:
>        properties:
>          compatible:
>            contains:
> -            const: img,img-axe-1-16m
> +            enum:
> +              - img,img-axe-1-16m
> +              - img,img-bxm-4-64

This isn't right – BXM-4-64 has two power domains like BXS-4-64. I don't
really know what the right way to handle that in devicetree is given the
TH1520 appears to expose only a top-level domain for the entire GPU, but
there are definitely two separate domains underneath that as far as the
GPU is concerned (see the attached snippet from integration guide).

Since power nodes are ref-counted anyway, do we just use the same node
for both domains and let the driver up/down-count it twice?

Cheers,
Matt

>      then:
>        properties:
>          power-domains:
> 


-- 
Matt Coster
E: matt.coster@imgtec.com

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