linux-kernel - Re: [PATCH v2 2/6] dt-bindings: display/msm: gpu: Document A612 GPU

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Message-ID: <20251110-wise-lurking-roadrunner-f0cec3@kuoka>
Date: Mon, 10 Nov 2025 08:48:40 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Akhil P Oommen <akhilpo@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>, 
	Konrad Dybcio <konradybcio@...nel.org>, Dmitry Baryshkov <lumag@...nel.org>, 
	Abhinav Kumar <abhinav.kumar@...ux.dev>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, Jessica Zhang <jesszhan0024@...il.com>, 
	Dan Carpenter <dan.carpenter@...aro.org>, linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/6] dt-bindings: display/msm: gpu: Document A612 GPU

On Fri, Nov 07, 2025 at 02:20:07AM +0530, Akhil P Oommen wrote:
> A612 GPU has a new IP called RGMU (Reduced Graphics Management Unit)
> which replaces GMU. But it doesn't do clock or voltage scaling. So we
> need the gpu core clock in the GPU node along with the power domain to
> do clock and voltage scaling from the kernel. Update the bindings to
> describe this GPU.
> 
> Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
> ---
>  .../devicetree/bindings/display/msm/gpu.yaml       | 32 ++++++++++++++++++++--
>  1 file changed, 30 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/gpu.yaml b/Documentation/devicetree/bindings/display/msm/gpu.yaml
> index 826aafdcc20b..a6bbc88e6a24 100644
> --- a/Documentation/devicetree/bindings/display/msm/gpu.yaml
> +++ b/Documentation/devicetree/bindings/display/msm/gpu.yaml
> @@ -45,11 +45,11 @@ properties:
>            - const: amd,imageon
>  
>    clocks:
> -    minItems: 2
> +    minItems: 1
>      maxItems: 7
>  
>    clock-names:
> -    minItems: 2
> +    minItems: 1
>      maxItems: 7
>  
>    reg:
> @@ -387,6 +387,34 @@ allOf:
>        required:
>          - clocks
>          - clock-names
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: qcom,adreno-612.0
> +    then:
> +      properties:
> +        clocks:
> +          items:
> +            - description: GPU Core clock
> +
> +        clock-names:
> +          items:
> +            - const: core
> +
> +        reg:
> +          items:
> +            - description: GPU Reg memory
> +
> +        reg-names:
> +          items:
> +            - const: kgsl_3d0_reg_memory

What happened with the second entry? Please describe the hardware
COMPLETELY (see writing bindings doc).

Best regards,
Krzysztof