arm64: tegra: Add PWM fan for Jetson AGX Orin

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2144639
Depends: https://bugzilla.redhat.com/show_bug.cgi?id=2135064
Tested: Simple boot test and CKI

commit 7a2c613
Author:    Jon Hunter <jonathanh@nvidia.com>
Date:      Wed Oct 19 14:29:03 2022 +0100

    arm64: tegra: Add PWM fan for Jetson AGX Orin

    Add the PWM fan node for the Tegra234 Jetson AGX Orin platform.

    Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
    Signed-off-by: Thierry Reding <treding@nvidia.com>
    (cherry picked from commit 7a2c613)

Signed-off-by: Al Stone <ahs3@redhat.com>

Author: Al Stone

arch/arm64/boot/dts/nvidia/tegra234-p3737-0000+p3701-0000.dts

@@ -2007,6 +2007,12 @@
 			status = "okay";
 		};
 
+		pwm@32a0000 {
+			assigned-clocks = <&bpmp TEGRA234_CLK_PWM3>;
+			assigned-clock-parents = <&bpmp TEGRA234_CLK_PLLP_OUT0>;
+			status = "okay";
+		};
+
 		hda@3510000 {
 			nvidia,model = "NVIDIA Jetson AGX Orin HDA";
 			status = "okay";
@@ -2184,4 +2190,12 @@
 		phy-names = "p2u-0", "p2u-1", "p2u-2", "p2u-3", "p2u-4",
 			    "p2u-5", "p2u-6", "p2u-7";
 	};
+
+	pwm-fan {
+		compatible = "pwm-fan";
+		pwms = <&pwm3 0 45334>;
+
+		cooling-levels = <0 95 178 255>;
+		#cooling-cells = <2>;
+	};
 };