* Microchip mcp3421/2/3/4/6/7/8 chip family (ADC)

Required properties:
 - compatible: Should be
	"microchip,mcp3421" or
	"microchip,mcp3422" or
	"microchip,mcp3423" or
	"microchip,mcp3424" or
	"microchip,mcp3426" or
	"microchip,mcp3427" or
	"microchip,mcp3428"
 - reg: I2C address for the device

Example:
adc@0 {
	compatible = "microchip,mcp3424";
	reg = <0x68>;
};
