linux-kernel - Re: [PATCH v5] dt-bindings: gpu: mali-utgard: Add the #cooling-cells property

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Date:   Wed, 15 Apr 2020 09:52:27 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        robh+dt@...nel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Cc:     linux-amlogic@...ts.infradead.org, Qiang Yu <yuq825@...il.com>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v5] dt-bindings: gpu: mali-utgard: Add the #cooling-cells
 property

On 11/04/2020 18:57, Martin Blumenstingl wrote:
> The GPU can be one of the big heat sources on a SoC. Allow the
> "#cooling-cells" property to be specified for ARM Mali Utgard GPUs so
> the GPU clock speeds (and voltages) can be reduced to prevent a SoC from
> overheating.
> 
> Reviewed-by: Qiang Yu <yuq825@...il.com>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> ---
> Changes since v4 at [0]:
> - Added Qiang's Reviewed-by (many thanks)
> - re-send because I missed the devicetree mailing list in v4
> 
> 
> [0] https://patchwork.kernel.org/patch/11448013/
> 
> 
>  Documentation/devicetree/bindings/gpu/arm,mali-utgard.yaml | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-utgard.yaml b/Documentation/devicetree/bindings/gpu/arm,mali-utgard.yaml
> index f5401cc8de4a..4869258daadb 100644
> --- a/Documentation/devicetree/bindings/gpu/arm,mali-utgard.yaml
> +++ b/Documentation/devicetree/bindings/gpu/arm,mali-utgard.yaml
> @@ -107,6 +107,9 @@ properties:
>  
>    operating-points-v2: true
>  
> +  "#cooling-cells":
> +    const: 2
> +
>  required:
>    - compatible
>    - reg
> @@ -164,6 +167,7 @@ examples:
>        clocks = <&ccu 1>, <&ccu 2>;
>        clock-names = "bus", "core";
>        resets = <&ccu 1>;
> +      #cooling-cells = <2>;
>      };
>  
>  ...
> 

Reviewed-by: Neil Armstrong <narmstrong@...libre.com>