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41553f267a
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>
38 lines
938 B
Plaintext
38 lines
938 B
Plaintext
Bindings for a fan connected to the PWM lines
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Required properties:
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- compatible : "pwm-fan"
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- pwms : the PWM that is used to control the PWM fan
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- cooling-levels : PWM duty cycle values in a range from 0 to 255
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which correspond to thermal cooling states
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Example:
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fan0: pwm-fan {
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compatible = "pwm-fan";
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cooling-min-state = <0>;
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cooling-max-state = <3>;
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#cooling-cells = <2>;
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pwms = <&pwm 0 10000 0>;
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cooling-levels = <0 102 170 230>;
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};
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thermal-zones {
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cpu_thermal: cpu-thermal {
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thermal-sensors = <&tmu 0>;
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polling-delay-passive = <0>;
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polling-delay = <0>;
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trips {
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cpu_alert1: cpu-alert1 {
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temperature = <100000>; /* millicelsius */
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hysteresis = <2000>; /* millicelsius */
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type = "passive";
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};
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};
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cooling-maps {
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map0 {
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trip = <&cpu_alert1>;
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cooling-device = <&fan0 0 1>;
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};
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};
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};
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