Documents the devicetree bindings for the Microchip MCP3021/3221.

Signed-off-by: Clemens Gruber <[email protected]>
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 Documentation/devicetree/bindings/hwmon/mcp3021.txt | 21 +++++++++++++++++++++
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 create mode 100644 Documentation/devicetree/bindings/hwmon/mcp3021.txt

diff --git a/Documentation/devicetree/bindings/hwmon/mcp3021.txt 
b/Documentation/devicetree/bindings/hwmon/mcp3021.txt
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+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
+       Reference voltage in millivolt (mV)
+
+Example:
+
+mcp3021@4d {
+       compatible = "microchip,mcp3021";
+       reg = <0x4d>;
+
+       reference-voltage = <4500>; /* 4.5 V */
+};
-- 
2.10.0

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