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Commit 41553f26 authored by Lukasz Majewski's avatar Lukasz Majewski Committed by Kukjin Kim
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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: default avatarLukasz Majewski <l.majewski@samsung.com>
Acked-by: default avatarEduardo Valentin <edubezval@gmail.com>
Acked-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: default avatarKukjin Kim <kgene@kernel.org>
parent 1605b60a

Documentation/devicetree/bindings/hwmon/pwm-fan.txt

+27 −2
Original line number Diff line number Diff line
@@ -3,10 +3,35 @@ 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



Example:

	pwm-fan {

	fan0: pwm-fan {

		compatible = "pwm-fan";

		status = "okay";

		cooling-min-state = <0>;

		cooling-max-state = <3>;

		#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>;

					};

			     };

		};