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usr / src / sys / contrib / device-tree / Bindings / hwmon /

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📄 ad741x.txt(238 B)
📄 adc128d818.txt(1.08 KB)
📄 adi,adm1177.yaml(1.82 KB)
📄 adi,axi-fan-control.yaml(1.37 KB)
📄 adi,ltc2947.yaml(3.21 KB)
📄 adm1275.txt(519 B)
📄 ads7828.txt(578 B)
📄 adt7475.yaml(2.26 KB)
📄 apm-xgene-hwmon.txt(387 B)
📄 as370.txt(241 B)
📄 aspeed-pwm-tacho.txt(2.32 KB)
📄 baikal,bt1-pvt.yaml(3.5 KB)
📄 cirrus,lochnagar.yaml(1.05 KB)
📄 dps650ab.txt(242 B)
📄 g762.txt(1.26 KB)
📄 gpio-fan.txt(1.18 KB)
📄 hih6130.txt(308 B)
📄 ibm,cffps1.txt(697 B)
📄 ibmpowernv.txt(564 B)
📄 ina2xx.txt(428 B)
📄 ina3221.txt(1.67 KB)
📄 jc42.txt(984 B)
📄 lm70.txt(369 B)
📄 lm75.txt(639 B)
📄 lm87.txt(810 B)
📄 lm90.txt(1.22 KB)
📄 ltc2978.txt(1.49 KB)
📄 ltc2990.txt(962 B)
📄 ltc4151.txt(356 B)
📄 ltq-cputemp.txt(155 B)
📄 max1619.txt(272 B)
📄 max31785.txt(747 B)
📄 max6650.txt(991 B)
📄 max6697.txt(1.94 KB)
📄 mcp3021.txt(396 B)
📄 microchip,sparx5-temp.yaml(830 B)
📄 npcm750-pwm-fan.txt(2.72 KB)
📄 nsa320-mcu.txt(649 B)
📄 ntc_thermistor.txt(1.11 KB)
📁 pmbus
📄 pwm-fan.txt(1.69 KB)
📄 sht15.txt(476 B)
📄 stts751.txt(292 B)
📄 ti,tmp513.yaml(2.47 KB)
📄 tmp108.txt(405 B)
📄 vexpress.txt(577 B)

Editing: pwm-fan.txt

Bindings for a fan connected to the PWM lines

Required properties:
- compatible	: "pwm-fan"
- pwms		: the PWM that is used to control the PWM fan
- cooling-levels      : PWM duty cycle values in a range from 0 to 255
			which correspond to thermal cooling states

Optional properties:
- fan-supply		: phandle to the regulator that provides power to the fan
- interrupts		: This contains a single interrupt specifier which
			  describes the tachometer output of the fan as an
			  interrupt source. The output signal must generate a
			  defined number of interrupts per fan revolution, which
			  require that it must be self resetting edge interrupts.
			  See interrupt-controller/interrupts.txt for the format.
- pulses-per-revolution : define the tachometer pulses per fan revolution as
			  an integer (default is 2 interrupts per revolution).
			  The value must be greater than zero.

Example:
	fan0: pwm-fan {
		compatible = "pwm-fan";
		#cooling-cells = <2>;
		pwms = <&pwm 0 10000 0>;
		cooling-levels = <0 102 170 230>;
	};

thermal-zones {
		cpu_thermal: cpu-thermal {
			     thermal-sensors = <&tmu 0>;
			     polling-delay-passive = <0>;
			     polling-delay = <0>;
			     trips {
					cpu_alert1: cpu-alert1 {
						    temperature = <100000>; /* millicelsius */
						    hysteresis = <2000>; /* millicelsius */
						    type = "passive";
					};
			     };
			     cooling-maps {
					map0 {
						    trip = <&cpu_alert1>;
						    cooling-device = <&fan0 0 1>;
					};
			     };
		};

Example 2:
	fan0: pwm-fan {
		compatible = "pwm-fan";
		pwms = <&pwm 0 40000 0>;
		fan-supply = <&reg_fan>;
		interrupt-parent = <&gpio5>;
		interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
		pulses-per-revolution = <2>;
	};

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Editing: pwm-fan.txt

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