68 lines
1.9 KiB
Plaintext
68 lines
1.9 KiB
Plaintext
|
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 an interrupt specifier for each fan
|
||
|
|
tachometer output connected to 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 number of pulses per fan revolution for
|
||
|
|
each tachometer input 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 = <®_fan>;
|
||
|
|
interrupt-parent = <&gpio5>;
|
||
|
|
interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
|
||
|
|
pulses-per-revolution = <2>;
|
||
|
|
};
|
||
|
|
|
||
|
|
Example 3:
|
||
|
|
fan0: pwm-fan {
|
||
|
|
compatible = "pwm-fan";
|
||
|
|
pwms = <&pwm1 0 25000 0>;
|
||
|
|
interrupts-extended = <&gpio1 1 IRQ_TYPE_EDGE_FALLING>,
|
||
|
|
<&gpio2 5 IRQ_TYPE_EDGE_FALLING>;
|
||
|
|
pulses-per-revolution = <2>, <1>;
|
||
|
|
};
|