dt-bindings: Documentation entry to explain how to use PWM FAN as a cooling device
Explanation of several properties, which allow PWM fan working as a cooling device, have been embraced in this commit. Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Acked-by: Eduardo Valentin <edubezval@gmail.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Kukjin Kim <kgene@kernel.org>hifive-unleashed-5.1
parent
1605b60ad0
commit
41553f267a
|
@ -3,10 +3,35 @@ Bindings for a fan connected to the PWM lines
|
||||||
Required properties:
|
Required properties:
|
||||||
- compatible : "pwm-fan"
|
- compatible : "pwm-fan"
|
||||||
- pwms : the PWM that is used to control the 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
|
||||||
|
|
||||||
Example:
|
Example:
|
||||||
pwm-fan {
|
fan0: pwm-fan {
|
||||||
compatible = "pwm-fan";
|
compatible = "pwm-fan";
|
||||||
status = "okay";
|
cooling-min-state = <0>;
|
||||||
|
cooling-max-state = <3>;
|
||||||
|
#cooling-cells = <2>;
|
||||||
pwms = <&pwm 0 10000 0>;
|
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>;
|
||||||
|
};
|
||||||
|
};
|
||||||
};
|
};
|
||||||
|
|
Loading…
Reference in New Issue