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.majew...@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
Changes for v4:
- None
Changes for v5:
- Move thermal-zones description to example section
- Extending example section
---
.../devicetree/bindings/hwmon/pwm-fan.txt | 25 +++++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
index 610757c..645251b 100644
--- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
+++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
@@ -3,10 +3,33 @@ 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";
pwms = <&pwm 0 10000 0>;
+ cooling-levels = <0 102 170 230>;
+ };
+
+ thermal-zones {
+ cpu_thermal: cpu-thermal {
+ cooling-min-state = <0>;
+ cooling-max-state = <3>;
+ #cooling-cells = <2>;
+ trips {
+ cpu_alert1: cpu-alert1 {
+ temperature = <100000>; /* millicelsius */
+ hysteresis = <2000>; /* millicelsius */
+ type = "passive";
+ };
+ };
+ cooling-maps {
+ map0 {
+ trip = <&cpu_alert1>;
+ cooling-device = <&fan0 0 1>;
+ };
+ };
};
--
2.0.0.rc2
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