hwmon: (max6650) Add devicetree support documentation

MikeLooijmans · groeck · commit 88de8e1d43e2 · 2016-09-08T21:34:17.000-07:00
This adds the devicetree binding documentation for the max6650 fan
controller.

Signed-off-by: Mike Looijmans &lt;mike.looijmans@topic.nl&gt;
Acked-by: Rob Herring &lt;robh@kernel.org&gt;
Signed-off-by: Guenter Roeck &lt;linux@roeck-us.net&gt;
diff --git a/Documentation/devicetree/bindings/hwmon/max6650.txt b/Documentation/devicetree/bindings/hwmon/max6650.txt
@@ -0,0 +1,23 @@
+Bindings for MAX6651 and MAX6650 I2C fan controllers
+
+Reference:
+[1]	https://datasheets.maximintegrated.com/en/ds/MAX6650-MAX6651.pdf
+
+Required properties:
+- compatible : One of "maxim,max6650" or "maxim,max6651"
+- reg        : I2C address, one of 0x1b, 0x1f, 0x4b, 0x48.
+
+Optional properties, default is to retain the chip's current setting:
+- maxim,fan-microvolt : The supply voltage of the fan, either 5000000 uV or
+			12000000 uV.
+- maxim,fan-prescale  : Pre-scaling value, as per datasheet [1]. Lower values
+			allow more fine-grained control of slower fans.
+			Valid: 1, 2, 4, 8, 16.
+
+Example:
+	fan-max6650: max6650@1b {
+		reg = <0x1b>;
+		compatible = "maxim,max6650";
+		maxim,fan-microvolt = <12000000>;
+		maxim,fan-prescale = <4>;
+	};
