// Grove I2C ADC
// https://wiki.seeedstudio.com/Grove-I2C_ADC

/dts-v1/;
/plugin/;

/{
	compatible = "brcm,bcm2835";

	// Create a fictitious voltage regulator for the ADC121C021 reference

	fragment@0 {
		target-path = "/";
		__overlay__ {
			Grove3v0: Grove3v0 {
				compatible = "regulator-fixed";
				regulator-name = "Grove3v0";
				regulator-min-microvolt = <3000000>;
				regulator-max-microvolt = <3000000>;
				regulator-always-on;
				status = "okay";
 			};
		};
	};

        // Enable ADC121C021 on I2C1

	fragment@1 {
		target = <&i2c_arm>;
		__overlay__ {
			#address-cells = <1>;
			#size-cells = <0>;
			status = "okay";

			adc121c021: adc121c021@50 {
				compatible = "ti,adc121c";
				reg = <0x50>;
				status = "okay";
				vref-supply = <&Grove3v0>;
			};
		};
	};

	// Define parameters to change the I2C address and to calibrate the
        // ADC121C021 supply & reference voltage

	__overrides__ {
		addr = <&adc121c021>,"reg:0";
		min = <&Grove3v0>, "regulator-min-microvolt:0";
		max = <&Grove3v0>, "regulator-max-microvolt:0";
	};
};