hwmon: (mcp3021) add devicetree bindings documentation

Document the devicetree bindings for the Microchip MCP3021/3221.

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/Documentation/devicetree/bindings/hwmon/mcp3021.txt b/Documentation/devicetree/bindings/hwmon/mcp3021.txt
new file mode 100644 (file)
index 0000000..294318b
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/mcp3021.txt
@@ -0,0 +1,21 @@
+mcp3021 properties
+
+Required properties:
+- compatible: Must be one of the following:
+       - "microchip,mcp3021" for mcp3021
+       - "microchip,mcp3221" for mcp3221
+- reg: I2C address
+
+Optional properties:
+
+- reference-voltage-microvolt
+       Reference voltage in microvolt (uV)
+
+Example:
+
+mcp3021@4d {
+       compatible = "microchip,mcp3021";
+       reg = <0x4d>;
+
+       reference-voltage-microvolt = <4500000>; /* 4.5 V */
+};