From 01f11ffdfd909e870c3863af60875e8de328790a Mon Sep 17 00:00:00 2001
From: Aaron Kling <webgeek1234@gmail.com>
Date: Thu, 1 May 2025 17:32:23 -0500
Subject: [PATCH] arm64: tegra: Enable PWM fan on the Jetson TX1 Devkit

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 devkits are similar, so using the same configuration.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>
Link: https://lore.kernel.org/r/20250501-tx1-therm-v2-1-abdb1922c001@gmail.com
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 .../arm64/boot/dts/nvidia/tegra210-p2597.dtsi | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi b/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi
index 83ed6ac2a8d8..584461f3a619 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p2597.dtsi
@@ -1623,6 +1623,18 @@
 		};
 	};
 
+	fan: pwm-fan {
+		compatible = "pwm-fan";
+		pwms = <&pwm 3 45334>;
+		fan-supply = <&vdd_fan>;
+		interrupt-parent = <&gpio>;
+		interrupts = <TEGRA_GPIO(K, 7) IRQ_TYPE_EDGE_RISING>;
+
+		/* cooling level (0, 1, 2, 3) - pwm inverted */
+		cooling-levels = <255 128 64 0>;
+		#cooling-cells = <2>;
+	};
+
 	vdd_sys_mux: regulator-vdd-sys-mux {
 		compatible = "regulator-fixed";
 		regulator-name = "VDD_SYS_MUX";
@@ -1778,4 +1790,67 @@
 		enable-active-high;
 		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>;
+
+		regulator-enable-ramp-delay = <284>;
+	};
+
+	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>;
+				};
+			};
+		};
+	};
 };
-- 
2.50.1