arm64: dts: mediatek: cherry: Add platform thermal configuration

This platform has three auxiliary NTC thermistors, connected to the
SoC's ADC pins. Enable the auxadc in order to be able to read the
ADC values, add a generic-adc-thermal LUT for each and finally assign
them to the SoC's thermal zones.
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230424112523.1436926-2-angelogioacchino.delregno@collabora.com

arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi

@@ -127,6 +127,77 @@ ppvar_sys: regulator-ppvar-sys {
 		regulator-boot-on;
 	};
 
+	/* Murata NCP03WF104F05RL */
+	tboard_thermistor1: thermal-sensor-t1 {
+		compatible = "generic-adc-thermal";
+		#thermal-sensor-cells = <0>;
+		io-channels = <&auxadc 0>;
+		io-channel-names = "sensor-channel";
+		temperature-lookup-table = <	(-10000) 1553
+						(-5000) 1485
+						0 1406
+						5000 1317
+						10000 1219
+						15000 1115
+						20000 1007
+						25000 900
+						30000 796
+						35000 697
+						40000 605
+						45000 523
+						50000 449
+						55000 384
+						60000 327
+						65000 279
+						70000 237
+						75000 202
+						80000 172
+						85000 147
+						90000 125
+						95000 107
+						100000 92
+						105000 79
+						110000 68
+						115000 59
+						120000 51
+						125000 44>;
+	};
+
+	tboard_thermistor2: thermal-sensor-t2 {
+		compatible = "generic-adc-thermal";
+		#thermal-sensor-cells = <0>;
+		io-channels = <&auxadc 1>;
+		io-channel-names = "sensor-channel";
+		temperature-lookup-table = <	(-10000) 1553
+						(-5000) 1485
+						0 1406
+						5000 1317
+						10000 1219
+						15000 1115
+						20000 1007
+						25000 900
+						30000 796
+						35000 697
+						40000 605
+						45000 523
+						50000 449
+						55000 384
+						60000 327
+						65000 279
+						70000 237
+						75000 202
+						80000 172
+						85000 147
+						90000 125
+						95000 107
+						100000 92
+						105000 79
+						110000 68
+						115000 59
+						120000 51
+						125000 44>;
+	};
+
 	usb_vbus: regulator-5v0-usb-vbus {
 		compatible = "regulator-fixed";
 		regulator-name = "usb-vbus";
@@ -189,6 +260,10 @@ &afe {
 	memory-region = <&afe_mem>;
 };
 
+&auxadc {
+	status = "okay";
+};
+
 &dp_intf0 {
 	status = "okay";
 
@@ -1160,6 +1235,36 @@ mt6315_7_vbuck1: vbuck1 {
 	};
 };
 
+&thermal_zones {
+	soc-area-thermal {
+		polling-delay = <1000>;
+		polling-delay-passive = <250>;
+		thermal-sensors = <&tboard_thermistor1>;
+
+		trips {
+			trip-crit {
+				temperature = <84000>;
+				hysteresis = <1000>;
+				type = "critical";
+			};
+		};
+	};
+
+	pmic-area-thermal {
+		polling-delay = <1000>;
+		polling-delay-passive = <0>;
+		thermal-sensors = <&tboard_thermistor2>;
+
+		trips {
+			trip-crit {
+				temperature = <84000>;
+				hysteresis = <1000>;
+				type = "critical";
+			};
+		};
+	};
+};
+
 &u3phy0 {
 	status = "okay";
 };