[PATCH v1 1/4] arm64: dts: mediatek: cherry: Add platform thermal configuration

[AngeloGioacchino Del Regno]

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.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
 .../boot/dts/mediatek/mt8195-cherry.dtsi      | 124 ++++++++++++++++++
 1 file changed, 124 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
index 24669093fbed..ae2052a7160d 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
@@ -104,6 +104,108 @@ ppvar_sys: regulator-ppvar-sys {
 		regulator-boot-on;
 	};
 
+	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 = <	(-5000) 4241
+						0 4063
+						5000 3856
+						10000 3621
+						15000 3364
+						20000 3091
+						25000 2810
+						30000 2526
+						35000 2247
+						40000 1982
+						45000 1734
+						50000 1507
+						55000 1305
+						60000 1122
+						65000 964
+						70000 827
+						75000 710
+						80000 606
+						85000 519
+						90000 445
+						95000 382
+						100000 330
+						105000 284
+						110000 245
+						115000 213
+						120000 183
+						125000 161>;
+	};
+
+	tboard_thermistor2: thermal-sensor-t2 {
+		compatible = "generic-adc-thermal";
+		#thermal-sensor-cells = <0>;
+		io-channels = <&auxadc 0>;
+		io-channel-names = "sensor-channel";
+		temperature-lookup-table = <	(-5000) 4241
+						0 4063
+						5000 3856
+						10000 3621
+						15000 3364
+						20000 3091
+						25000 2810
+						30000 2526
+						35000 2247
+						40000 1982
+						45000 1734
+						50000 1507
+						55000 1305
+						60000 1122
+						65000 964
+						70000 827
+						75000 710
+						80000 606
+						85000 519
+						90000 445
+						95000 382
+						100000 330
+						105000 284
+						110000 245
+						115000 213
+						120000 183
+						125000 161>;
+	};
+
+	tboard_thermistor3: thermal-sensor-t3 {
+		compatible = "generic-adc-thermal";
+		#thermal-sensor-cells = <0>;
+		io-channels = <&auxadc 0>;
+		io-channel-names = "sensor-channel";
+		temperature-lookup-table = <	(-5000) 4241
+						0 4063
+						5000 3856
+						10000 3621
+						15000 3364
+						20000 3091
+						25000 2810
+						30000 2526
+						35000 2247
+						40000 1982
+						45000 1734
+						50000 1507
+						55000 1305
+						60000 1122
+						65000 964
+						70000 827
+						75000 710
+						80000 606
+						85000 519
+						90000 445
+						95000 382
+						100000 330
+						105000 284
+						110000 245
+						115000 213
+						120000 183
+						125000 161>;
+	};
+
 	usb_vbus: regulator-5v0-usb-vbus {
 		compatible = "regulator-fixed";
 		regulator-name = "usb-vbus";
@@ -243,6 +345,10 @@ &gpu {
 	mali-supply = <&mt6315_7_vbuck1>;
 };
 
+&auxadc {
+	status = "okay";
+};
+
 &i2c0 {
 	status = "okay";
 
@@ -1074,6 +1180,24 @@ mt6315_7_vbuck1: vbuck1 {
 	};
 };
 
+&thermal_zones {
+	ap_ntc1 {
+		polling-delay = <1000>;
+		polling-delay-passive = <0>;
+		thermal-sensors = <&tboard_thermistor1>;
+	};
+	ap_ntc2 {
+		polling-delay = <1000>;
+		polling-delay-passive = <0>;
+		thermal-sensors = <&tboard_thermistor2>;
+	};
+	ap_ntc3 {
+		polling-delay = <1000>;
+		polling-delay-passive = <0>;
+		thermal-sensors = <&tboard_thermistor3>;
+	};
+};
+
 &u3phy0 {
 	status = "okay";
 };
-- 
2.39.2