@@ -3,10 +3,30 @@ 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
+
+Thorough description of the following bindings:
+ cooling-min-state = <0>;
+ cooling-max-state = <3>;
+ #cooling-cells = <2>;
+ thermal-zone {
+ cpu_thermal: cpu-thermal {
+ cooling-maps {
+ map0 {
+ trip = <&cpu_alert1>;
+ cooling-device = <&fan0 0 1>;
+ };
+ };
+ };
+
+for PWM FAN used as cooling device can be found at:
+./Documentation/devicetree/bindings/thermal/thermal.txt
Example:
pwm-fan {
compatible = "pwm-fan";
status = "okay";
pwms = <&pwm 0 10000 0>;
+ cooling-levels = <0 102 170 230>;
};
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> --- Changes for v2: - Rename cooling-pwm-values to cooling-levels - Remove default-pulse-width property and stick to default hwmon policy Changes for v3: - Changing commit title from "hwmon: dts: Doc:" to "Documentation: dts" - Remove unnecessary properties - Set maximal cooling level to 230 instead of 255 --- Documentation/devicetree/bindings/hwmon/pwm-fan.txt | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)