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From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
To:     matthias.bgg@gmail.com
Cc:     robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, kernel@collabora.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
Subject: [PATCH 1/5] arm64: dts: mediatek: cherry: Add platform thermal configuration
Date:   Thu, 20 Apr 2023 11:44:29 +0200
Message-Id: <20230420094433.42794-2-angelogioacchino.delregno@collabora.com>
In-Reply-To: <20230420094433.42794-1-angelogioacchino.delregno@collabora.com>
References: <20230420094433.42794-1-angelogioacchino.delregno@collabora.com>
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Precedence: bulk

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@collabora.com>
---
 .../boot/dts/mediatek/mt8195-cherry.dtsi      | 105 ++++++++++++++++++
 1 file changed, 105 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
index 8ac80a136c37..0820e9ba3829 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
@@ -114,6 +114,77 @@ 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";
@@ -260,6 +331,10 @@ &gpu {
 	mali-supply = <&mt6315_7_vbuck1>;
 };
 
+&auxadc {
+	status = "okay";
+};
+
 &i2c0 {
 	status = "okay";
 
@@ -1098,6 +1173,36 @@ mt6315_7_vbuck1: vbuck1 {
 	};
 };
 
+&thermal_zones {
+	soc_area_ntc {
+		polling-delay = <1000>;
+		polling-delay-passive = <250>;
+		thermal-sensors = <&tboard_thermistor1>;
+
+		trips {
+			trip-crit {
+				temperature = <95000>;
+				hysteresis = <2000>;
+				type = "critical";
+			};
+		};
+	};
+
+	pmic_area_ntc {
+		polling-delay = <1000>;
+		polling-delay-passive = <0>;
+		thermal-sensors = <&tboard_thermistor2>;
+
+		trips {
+			trip-crit {
+				temperature = <95000>;
+				hysteresis = <2000>;
+				type = "critical";
+			};
+		};
+	};
+};
+
 &u3phy0 {
 	status = "okay";
 };
-- 
2.40.0