From b603d035b1faca7763fad8debab95e333f01ab7e Mon Sep 17 00:00:00 2001
From: Aaron Kling <webgeek1234@gmail.com>
Date: Fri, 9 May 2025 00:26:26 -0500
Subject: [PATCH] arm64: tegra: Enable PWM fan on P2894

This is based on 6f78a94, which enabled added the fan and thermal zones
for the Jetson Nano Devkit. The fan and thermal characteristics of the
two devices are similar, so using the same configuration.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
---
 .../arm64/boot/dts/nvidia/tegra210-p2894.dtsi | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2894.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2894.dtsi
index 34808dc33bb4..186d712a132d 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210-p2894.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p2894.dtsi
@@ -1825,6 +1825,18 @@
 		method = "smc";
 	};
 
+	fan: pwm-fan {
+		compatible = "pwm-fan";
+		pwms = <&pwm 3 65536>;
+		fan-supply = <&vdd_fan>;
+		interrupt-parent = <&gpio>;
+		interrupts = <TEGRA_GPIO(G, 0) IRQ_TYPE_EDGE_RISING>;
+
+		/* cooling level (0, 1, 2, 3) - pwm inverted */
+		cooling-levels = <255 128 64 0>;
+		#cooling-cells = <2>;
+	};
+
 	battery_reg: regulator-vdd-ac-bat {
 		compatible = "regulator-fixed";
 		regulator-name = "vdd-ac-bat";
@@ -2031,4 +2043,56 @@
 		regulator-enable-ramp-delay = <2000>;
 		regulator-settling-time-us = <160>;
 	};
+
+	thermal-zones {
+		cpu-thermal {
+			trips {
+				cpu_trip_critical: critical {
+					temperature = <96500>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+
+				cpu_trip_hot: hot {
+					temperature = <70000>;
+					hysteresis = <2000>;
+					type = "hot";
+				};
+
+				cpu_trip_active: active {
+					temperature = <50000>;
+					hysteresis = <2000>;
+					type = "active";
+				};
+
+				cpu_trip_passive: passive {
+					temperature = <30000>;
+					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>;
+				};
+			};
+		};
+	};
 };