[PATCH 1/4] arm64: tegra: Add PWM fan on Jetson AGX Orin DevKit

[Thierry Reding]

From: Thierry Reding <treding@xxxxxxxxxx>

Without a PWM fan device node to actively control the PWM, the fan will
either stop or run at full speed, depending on the state of the PWM when
the controller's clock gets turned off during boot.

One is bad for the system's lifetime and the other is very annoying for
anyone in close proximity to the device, so add the PWM fan in device
tree to fix this.

Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
 arch/arm64/boot/dts/nvidia/tegra264-p4071-0000+p3834.dtsi | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra264-p4071-0000+p3834.dtsi b/arch/arm64/boot/dts/nvidia/tegra264-p4071-0000+p3834.dtsi
index 45f8df9bbfd6..4550e843f513 100644
--- a/arch/arm64/boot/dts/nvidia/tegra264-p4071-0000+p3834.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra264-p4071-0000+p3834.dtsi
@@ -9,4 +9,17 @@ aliases {
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
+
+	bus@0 {
+		pwm@c6a0000 {
+			status = "okay";
+		};
+	};
+
+	fan: pwm-fan {
+		compatible = "pwm-fan";
+		cooling-levels = <77 102 140 192 255>;
+		pwms = <&pwm4 0 40000>;
+		#cooling-cells = <2>;
+	};
 };

-- 
2.55.0