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| author |   Lukasz Majewski <l.majewski@samsung.com> | 2015-08-17 08:53:47 +0900 |
|---|---|---|
| committer |   Kukjin Kim <kgene@kernel.org> | 2015-09-17 07:48:11 +0900 |
| commit | 41553f267a369f24244867f5d6c8d4df254906b7 (patch) | |
| tree | d3ae8a1912f17e71746851c7fdfb09ec45b58752 /Documentation/devicetree/bindings/hwmon | |
| parent | ARM: dts: add suspend opp to exynos4412 (diff) | |
| download | linux-dev-41553f267a369f24244867f5d6c8d4df254906b7.tar.xz linux-dev-41553f267a369f24244867f5d6c8d4df254906b7.zip | |
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>
Diffstat (limited to 'Documentation/devicetree/bindings/hwmon')
| -rw-r--r-- | Documentation/devicetree/bindings/hwmon/pwm-fan.txt | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt index 610757ce4492..c6d533202d3e 100644 --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt @@ -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>; + }; + }; + }; |