linux-kernel - [PATCH v2 12/12] arm64: dts: qcom: sc8280xp-x13s: Add thermal zone support

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Date:   Sat, 29 Oct 2022 10:44:49 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     andersson@...nel.org
Cc:     konrad.dybcio@...ainline.org, 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,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v2 12/12] arm64: dts: qcom: sc8280xp-x13s: Add thermal zone support

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 throttle down to keep the
temperature at a sane level.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 .../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 ca77c19c6d0d..96e2fa72f782 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";
 
-- 
2.25.1