linux/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-microvolt
Reference voltage in microvolt (uV)
Example:
mcp3021@4d {
compatible = "microchip,mcp3021";
reg = <0x4d>;
reference-voltage-microvolt = <4500000>; /* 4.5 V */
};