linux-kernel - Re: [PATCH v4 12/12] arm64: dts: qcom: sc8280xp-x13s: Add thermal zone support

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Date:   Thu, 3 Nov 2022 21:11:25 +0100
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        andersson@...nel.org
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        johan+linaro@...nel.org, quic_jprakash@...cinc.com,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, steev@...i.org
Subject: Re: [PATCH v4 12/12] arm64: dts: qcom: sc8280xp-x13s: Add thermal
 zone support


On 03/11/2022 10:58, Manivannan Sadhasivam wrote:
> Add thermal zone support by making use of the thermistor SYS_THERM6.
> Based on experiments, this thermistor seems to reflect the actual
> surface temperature of the laptop.
>
> For the cooling device, all BIG CPU cores are throttled down to keep the
> temperature at a sane level.
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---

Taking into account your explanations from our thread on v2,


Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>


Konrad

>   .../qcom/sc8280xp-lenovo-thinkpad-x13s.dts    | 46 +++++++++++++++++++
>   1 file changed, 46 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> index bdaacf1abf9f..60dbc736f4d7 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> @@ -29,6 +29,52 @@ backlight {
>   		pinctrl-0 = <&edp_bl_en>, <&edp_bl_pwm>;
>   	};
>   
> +	thermal-zones {
> +		skin-temp-thermal {
> +			polling-delay-passive = <250>;
> +			polling-delay = <0>;
> +			thermal-sensors = <&pmk8280_adc_tm 5>;
> +
> +			trips {
> +				skin_temp_alert0: trip-point0 {
> +					temperature = <55000>;
> +					hysteresis = <1000>;
> +					type = "passive";
> +				};
> +
> +				skin_temp_alert1: trip-point1 {
> +					temperature = <58000>;
> +					hysteresis = <1000>;
> +					type = "passive";
> +				};
> +
> +				skin-temp-crit {
> +					temperature = <73000>;
> +					hysteresis = <1000>;
> +					type = "critical";
> +				};
> +			};
> +
> +			cooling-maps {
> +				map0 {
> +					trip = <&skin_temp_alert0>;
> +					cooling-device = <&CPU4 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +							 <&CPU5 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +							 <&CPU6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +							 <&CPU7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +				};
> +
> +				map1 {
> +					trip = <&skin_temp_alert1>;
> +					cooling-device = <&CPU4 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +							 <&CPU5 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +							 <&CPU6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +							 <&CPU7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +				};
> +			};
> +		};
> +	};
> +
>   	vreg_edp_bl: regulator-edp-bl {
>   		compatible = "regulator-fixed";
>