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Subject[PATCH RFC 1/2] dt-bindings: hwmon: Add RPi PoE HAT documentation
Date
From: Serge Schneider <serge@raspberrypi.org>

This patch adds the binding for the fan on the Raspberry Pi Power over
Ethernet HAT.

Signed-off-by: Serge Schneider <serge@raspberrypi.org>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
.../devicetree/bindings/hwmon/rpi-poe-fan.txt | 55 ++++++++++++++++++++++
1 file changed, 55 insertions(+)
create mode 100644 Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt

diff --git a/Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt b/Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt
new file mode 100644
index 0000000..c71f856
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt
@@ -0,0 +1,55 @@
+Bindings for the Raspberry Pi PoE HAT fan
+
+Required properties:
+- compatible : "raspberrypi,rpi-poe-fan"
+- firmware : Reference to the RPi firmware device node
+- 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:
+ fan0: rpi-poe-fan@0 {
+ compatible = "raspberrypi,rpi-poe-fan";
+ firmware = <&firmware>;
+ cooling-min-state = <0>;
+ cooling-max-state = <3>;
+ #cooling-cells = <2>;
+ cooling-levels = <0 50 150 255>;
+ status = "okay";
+ };
+
+ thermal-zones {
+ cpu_thermal: cpu-thermal {
+ trips {
+ threshold: trip-point@0 {
+ temperature = <45000>;
+ hysteresis = <5000>;
+ type = "active";
+ };
+ target: trip-point@1 {
+ temperature = <50000>;
+ hysteresis = <2000>;
+ type = "active";
+ };
+ cpu_hot: cpu_hot@0 {
+ temperature = <55000>;
+ hysteresis = <2000>;
+ type = "active";
+ };
+ };
+ cooling-maps {
+ map0 {
+ trip = <&threshold>;
+ cooling-device = <&fan0 0 1>;
+ };
+ map1 {
+ trip = <&target>;
+ cooling-device = <&fan0 1 2>;
+ };
+ map2 {
+ trip = <&cpu_hot>;
+ cooling-device = <&fan0 2 3>;
+ };
+ };
+ };
+ };
--
2.7.4
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