riscv: dts: thead: lpi4a: enable pwm fan

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>

arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts

@@ -37,6 +37,58 @@
 		stdout-path = "serial0:115200n8";
 	};
 
+	fan: pwm-fan {
+		compatible = "pwm-fan";
+		#cooling-cells = <2>;
+		pwms = <&pwm 1 10000000 0>;
+		cooling-levels = <0 66 196 255>;
+	};
+
+	thermal-zones {
+		cpu-thermal {
+			polling-delay = <1000>;
+			polling-delay-passive = <1000>;
+			thermal-sensors = <&pvt 0>;
+
+			trips {
+				trip_active0: active-0 {
+					temperature = <39000>;
+					hysteresis = <5000>;
+					type = "active";
+				};
+
+				trip_active1: active-1 {
+					temperature = <50000>;
+					hysteresis = <5000>;
+					type = "active";
+				};
+
+				trip_active2: active-2 {
+					temperature = <60000>;
+					hysteresis = <5000>;
+					type = "active";
+				};
+			};
+
+			cooling-maps {
+				map-active-0 {
+					cooling-device = <&fan 1 1>;
+					trip = <&trip_active0>;
+				};
+
+				map-active-1 {
+					cooling-device = <&fan 2 2>;
+					trip = <&trip_active1>;
+				};
+
+				map-active-2 {
+					cooling-device = <&fan 3 3>;
+					trip = <&trip_active2>;
+				};
+			};
+		};
+	};
+
 	hub_5v: regulator-hub_5v {
 		compatible = "regulator-fixed";
 		regulator-name = "HUB_5V";