RPi Fan Control overlay

rpi-poe-overlay.dts

/*
 * Overlay for the Raspberry Pi POE HAT.
 */
/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2708";

	fragment@0 {
		target-path = "/";
		__overlay__ {
			fan0: rpi-poe-fan@0 {
				compatible = "raspberrypi,rpi-poe-fan";
				firmware = <&firmware>;
				cooling-min-state = <0>;
				cooling-max-state = <2>;
				#cooling-cells = <2>;
				cooling-levels = <0 150 255>;
				status = "okay";
			};
		};
	};

	fragment@1 {
		target = <&cpu_thermal>;
		__overlay__ {
			trips {
				trip0: trip0 {
					temperature = <75000>;
					hysteresis = <25000>;
					type = "active";
				};
				trip1: trip1 {

					temperature = <80000>;
					hysteresis = <5000>;
					type = "active";
				};
			};
			cooling-maps {
				map0 {
					trip = <&trip0>;
					cooling-device = <&fan0 0 1>;
				};
				map1 {
					trip = <&trip1>;
					cooling-device = <&fan0 1 2>;
				};
			};
		};
	};

	fragment@2 {
		target-path = "/__overrides__";
		__overlay__ {
			poe_fan_temp0 =		<&trip0>,"temperature:0";
			poe_fan_temp0_hyst =	<&trip0>,"hysteresis:0";
			poe_fan_temp1 =		<&trip1>,"temperature:0";
			poe_fan_temp1_hyst =	<&trip1>,"hysteresis:0";
		};
	};
};