linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sc8280xp: Introduce additional tsens instances

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Message-ID: <ZbPfeq6ElA3vMf_O@hovoldconsulting.com>
Date: Fri, 26 Jan 2024 17:36:10 +0100
From: Johan Hovold <johan@...nel.org>
To: Bjorn Andersson <quic_bjorande@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: qcom: sc8280xp: Introduce additional
 tsens instances

On Fri, Jan 26, 2024 at 07:12:45AM -0800, Bjorn Andersson wrote:
> The SC8280XP contains two additional tsens instances, providing among
> other things thermal measurements for the GPU.
> 
> Add these and a GPU thermal-zone.
> 
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
> Changes in v2:
> - Drop TM/SROT comments
> - Remove polling delays, rely on interrupts
> - Link to v1: https://lore.kernel.org/r/20240118-sc8280xp-tsens2_3-v1-1-e86bce14f6bf@quicinc.com
> ---
>  arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 37 ++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> index febf28356ff8..7bfbb1bd8f4a 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> @@ -4033,6 +4033,28 @@ tsens1: thermal-sensor@...5000 {
>  			#thermal-sensor-cells = <1>;
>  		};
>  
> +		tsens2: thermal-sensor@...1000 {
> +			compatible = "qcom,sc8280xp-tsens", "qcom,tsens-v2";
> +			reg = <0 0x0c251000 0 0x1ff>,
> +			      <0 0x0c224000 0 0x8>;
> +			#qcom,sensors = <11>;
> +			interrupts-extended = <&pdc 122 IRQ_TYPE_LEVEL_HIGH>,
> +					      <&pdc 124 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-names = "uplow", "critical";
> +			#thermal-sensor-cells = <1>;
> +		};
> +
> +		tsens3: thermal-sensor@...2000 {
> +			compatible = "qcom,sc8280xp-tsens", "qcom,tsens-v2";
> +			reg = <0 0x0c252000 0 0x1ff>,
> +			      <0 0x0c225000 0 0x8>;
> +			#qcom,sensors = <5>;
> +			interrupts-extended = <&pdc 123 IRQ_TYPE_LEVEL_HIGH>,
> +					      <&pdc 125 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-names = "uplow", "critical";
> +			#thermal-sensor-cells = <1>;
> +		};

These should go before tsens0 based on the unit address.

> +
>  		aoss_qmp: power-management@...0000 {
>  			compatible = "qcom,sc8280xp-aoss-qmp", "qcom,aoss-qmp";
>  			reg = <0 0x0c300000 0 0x400>;
> @@ -5212,6 +5234,21 @@ cpu-crit {
>  			};
>  		};
>  
> +		gpu-thermal {
> +			polling-delay-passive = <0>;
> +			polling-delay = <0>;
> +
> +			thermal-sensors = <&tsens2 2>;
> +
> +			trips {
> +				cpu-crit {
> +					temperature = <110000>;
> +					hysteresis = <1000>;
> +					type = "critical";
> +				};
> +			};
> +		};

Shall you submit a follow-on patch to set the polling delays to zero
for the other thermal zones (cpu, cluster, mem) so that we don't poll
for those?

Looks good to me otherwise: 

Reviewed-by: Johan Hovold <johan+linaro@...nel.org>

Johan