arm64: dts: qcom: sc7180: coachz: Add thermal config for skin temperature

Add ADC and thermal monitor configuration for skin temperature,
plus a thermal zone that monitors the skin temperature and uses
the big cores as cooling devices.

CoachZ rev1 is stuffed with an incompatible thermistor for the
skin temperature, disable the thermal zone for rev1 to avoid
the use of bogus temperature values.
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Link: https://lore.kernel.org/r/20210414111007.v1.1.I1a438604a79025307f177347d45815987b105cb5@changeidSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz-r1.dts

@@ -23,6 +23,15 @@ &charger_thermal {
 	status = "disabled";
 };
 
+/*
+ * CoachZ rev1 is stuffed with a 47k NTC as thermistor for skin temperature,
+ * which currently is not supported by the PM6150 ADC driver. Disable the
+ * skin temperature thermal zone to avoid using bogus temperature values.
+ */
+&skin_temp_thermal {
+	status = "disabled";
+};
+
 &tlmm {
 	gpio-line-names = "HUB_RST_L",
 			  "AP_RAM_ID0",

arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz.dtsi

@@ -25,6 +25,50 @@ adau7002: audio-codec-1 {
 		IOVDD-supply = <&pp1800_l15a>;
 		#sound-dai-cells = <0>;
 	};
+
+	thermal-zones {
+		skin_temp_thermal: skin-temp-thermal {
+			polling-delay-passive = <250>;
+			polling-delay = <0>;
+
+			thermal-sensors = <&pm6150_adc_tm 1>;
+			sustainable-power = <814>;
+
+			trips {
+				skin_temp_alert0: trip-point0 {
+					temperature = <42000>;
+					hysteresis = <1000>;
+					type = "passive";
+				};
+
+				skin_temp_alert1: trip-point1 {
+					temperature = <45000>;
+					hysteresis = <1000>;
+					type = "passive";
+				};
+
+				skin-temp-crit {
+					temperature = <60000>;
+					hysteresis = <1000>;
+					type = "critical";
+				};
+			};
+
+			cooling-maps {
+				map0 {
+					trip = <&skin_temp_alert0>;
+					cooling-device = <&CPU6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&CPU7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+
+				map1 {
+					trip = <&skin_temp_alert1>;
+					cooling-device = <&CPU6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
+							 <&CPU7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+				};
+			};
+		};
+	};
 };
 
 &ap_spi_fp {
@@ -77,6 +121,25 @@ &panel {
 	compatible = "boe,nv110wtm-n61";
 };
 
+&pm6150_adc {
+	skin-temp-thermistor@4e {
+		reg = <ADC5_AMUX_THM2_100K_PU>;
+		qcom,ratiometric;
+		qcom,hw-settle-time = <200>;
+	};
+};
+
+&pm6150_adc_tm {
+	status = "okay";
+
+	skin-temp-thermistor@1 {
+		reg = <1>;
+		io-channels = <&pm6150_adc ADC5_AMUX_THM2_100K_PU>;
+		qcom,ratiometric;
+		qcom,hw-settle-time-us = <200>;
+	};
+};
+
 &pp3300_dx_edp {
 	gpio = <&tlmm 67 GPIO_ACTIVE_HIGH>;
 };