dt-bindings: power: supply: Add DT bindings for max77650

Battery charger driver for MAX77650 PMIC from Maxim Integrated.

This module is part of the MAX77650 MFD device. For more details

see Documentation/devicetree/bindings/mfd/max77650.txt.

The charger is represented as a sub-node of the PMIC node on the device tree.

Required properties:

--------------------

- compatible:		Must be "maxim,max77650-charger"

Optional properties:

--------------------

- input-voltage-min-microvolt:	Minimum CHGIN regulation voltage. Must be one

				of: 4000000, 4100000, 4200000, 4300000,

				4400000, 4500000, 4600000, 4700000.

- input-current-limit-microamp:	CHGIN input current limit (in microamps). Must

				be one of: 95000, 190000, 285000, 380000,

				475000.

Example:

--------

	charger {

		compatible = "maxim,max77650-charger";

		input-voltage-min-microvolt = <4200000>;

		input-current-limit-microamp = <285000>;

	};