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

[Manivannan Sadhasivam]

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@xxxxxxxxxx>
---
 .../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";
 
-- 
2.25.1