arm64: dts: rockchip: add fan support to rock-5a

Add the necessary DT changes for the Rock 5A board to enable support for
the PWM controlled heat sink fan.
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20230710165228.105983-14-sebastian.reichel@collabora.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts

@@ -47,6 +47,14 @@ io-led {
 		};
 	};
 
+	fan: pwm-fan {
+		compatible = "pwm-fan";
+		cooling-levels = <0 95 145 195 255>;
+		fan-supply = <&vcc_5v0>;
+		pwms = <&pwm3 0 50000 0>;
+		#cooling-cells = <2>;
+	};
+
 	vcc12v_dcin: vcc12v-dcin-regulator {
 		compatible = "regulator-fixed";
 		regulator-name = "vcc12v_dcin";
@@ -286,6 +294,12 @@ rtl8211f_rst: rtl8211f-rst {
 	};
 };
 
+&pwm3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pwm3m1_pins>;
+	status = "okay";
+};
+
 &saradc {
 	vref-supply = <&avcc_1v8_s0>;
 	status = "okay";