From b84f1c0187653b2a91919624e2da0dab0b036a6f Mon Sep 17 00:00:00 2001
From: Aaron Kling <webgeek1234@gmail.com>
Date: Sun, 27 Apr 2025 15:05:32 -0500
Subject: [PATCH] arm64: tegra: Enable PWM fan on the Jetson TX2 Devkit

This is based on the existing configuration of the Jetson TX2 NX devkit.
The fan and thermal characteristics of the two devkits are similar, so
using the same configuration.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
Link: https://lore.kernel.org/r/20250427-tx2-therm-v1-1-65ddb4314723@gmail.com
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 .../boot/dts/nvidia/tegra186-p2771-0000.dts   | 109 ++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts b/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts
index 15aa49fc4503..a50fd205daa8 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts
+++ b/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts
@@ -2409,6 +2409,10 @@
 		};
 	};
 
+	pwm@c340000 {
+		status = "okay";
+	};
+
 	pcie@10003000 {
 		status = "okay";
 
@@ -2508,6 +2512,16 @@
 		};
 	};
 
+	fan: pwm-fan {
+		compatible = "pwm-fan";
+		pwms = <&pwm4 0 45334>;
+		fan-supply = <&vdd_fan>;
+
+		/* cooling level (0, 1, 2, 3) - pwm inverted */
+		cooling-levels = <255 128 64 0>;
+		#cooling-cells = <2>;
+	};
+
 	vdd_sd: regulator-vdd-sd {
 		compatible = "regulator-fixed";
 		regulator-name = "SD_CARD_SW_PWR";
@@ -2556,6 +2570,17 @@
 		vin-supply = <&vdd_5v0_sys>;
 	};
 
+	vdd_fan: regulator-vdd-fan {
+		compatible = "regulator-fixed";
+		regulator-name = "VDD_FAN";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+
+		gpio = <&exp1 4 GPIO_ACTIVE_LOW>;
+
+		vin-supply = <&vdd_5v0_sys>;
+	};
+
 	sound {
 		compatible = "nvidia,tegra186-audio-graph-card";
 		status = "okay";
@@ -2621,4 +2646,88 @@
 
 		label = "NVIDIA Jetson TX2 APE";
 	};
+
+	thermal-zones {
+		cpu-thermal {
+			polling-delay = <0>;
+			polling-delay-passive = <500>;
+			status = "okay";
+
+			trips {
+				cpu_trip_critical: critical {
+					temperature = <96500>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+
+				cpu_trip_hot: hot {
+					temperature = <79000>;
+					hysteresis = <2000>;
+					type = "hot";
+				};
+
+				cpu_trip_active: active {
+					temperature = <62000>;
+					hysteresis = <2000>;
+					type = "active";
+				};
+
+				cpu_trip_passive: passive {
+					temperature = <45000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+			};
+
+			cooling-maps {
+				map0 {
+					cooling-device = <&fan 3 3>;
+					trip = <&cpu_trip_critical>;
+				};
+
+				map1 {
+					cooling-device = <&fan 2 2>;
+					trip = <&cpu_trip_hot>;
+				};
+
+				map2 {
+					cooling-device = <&fan 1 1>;
+					trip = <&cpu_trip_active>;
+				};
+
+				map3 {
+					cooling-device = <&fan 0 0>;
+					trip = <&cpu_trip_passive>;
+				};
+			};
+		};
+
+		aux-thermal {
+			polling-delay = <0>;
+			polling-delay-passive = <500>;
+			status = "okay";
+
+			trips {
+				aux_alert0: critical {
+					temperature = <90000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+		};
+
+		gpu-thermal {
+			polling-delay = <0>;
+			polling-delay-passive = <500>;
+			status = "okay";
+
+			trips {
+				gpu_alert0: critical {
+					temperature = <99000>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+			};
+		};
+	};
 };
-- 
2.50.1