linux-kernel - Re: [v3,3/3] dt-bindings: drm/msm/gpu: Add cooling device support

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Date:   Wed, 28 Oct 2020 17:49:49 -0700
From:   mka@...omium.org
To:     Akhil P Oommen <akhilpo@...eaurora.org>
Cc:     freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dianders@...omium.org, dri-devel@...edesktop.org
Subject: Re: [v3,3/3] dt-bindings: drm/msm/gpu: Add cooling device support

On Wed, Oct 28, 2020 at 07:09:54PM +0530, Akhil P Oommen wrote:
> Add cooling device support to gpu. A cooling device is bound to a
> thermal zone to allow thermal mitigation.
> 
> Signed-off-by: Akhil P Oommen <akhilpo@...eaurora.org>
> ---
>  Documentation/devicetree/bindings/display/msm/gpu.txt | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/gpu.txt b/Documentation/devicetree/bindings/display/msm/gpu.txt
> index 1af0ff1..090dcb3 100644
> --- a/Documentation/devicetree/bindings/display/msm/gpu.txt
> +++ b/Documentation/devicetree/bindings/display/msm/gpu.txt
> @@ -39,6 +39,10 @@ Required properties:
>          a4xx Snapdragon SoCs. See
>          Documentation/devicetree/bindings/sram/qcom,ocmem.yaml.
>  
> +Optional properties:
> +- #cooling-cells: The value must be 2. For details, please refer
> +	Documentation/devicetree/bindings/thermal/thermal-cooling-devices.yaml.
> +
>  Example 3xx/4xx:
>  
>  / {
> @@ -61,6 +65,7 @@ Example 3xx/4xx:
>  		power-domains = <&mmcc OXILICX_GDSC>;
>  		operating-points-v2 = <&gpu_opp_table>;
>  		iommus = <&gpu_iommu 0>;
> +		#cooling-cells = <2>;
>  	};
>  
>  	gpu_sram: ocmem@...00000 {
> @@ -98,6 +103,8 @@ Example a6xx (with GMU):
>  		reg = <0x5000000 0x40000>, <0x509e000 0x10>;
>  		reg-names = "kgsl_3d0_reg_memory", "cx_mem";
>  
> +		#cooling-cells = <2>;
> +
>  		/*
>  		 * Look ma, no clocks! The GPU clocks and power are
>  		 * controlled entirely by the GMU

Reviewed-by: Matthias Kaehlcke <mka@...omium.org>