* Maxim MAX8973 Voltage Regulator

Required properties:

- compatible:	must be one of following:
			"maxim,max8973"
			"maxim,max77621".
- reg:		the i2c slave address of the regulator. It should be 0x1b.

Any standard regulator properties can be used to configure the single max8973
DCDC.

Optional properties:

-maxim,externally-enable: boolean, externally control the regulator output
		enable/disable.
-maxim,enable-gpio: GPIO for enable control. If the valid GPIO is provided
		then externally enable control will be considered.
-maxim,dvs-gpio: GPIO which is connected to DVS pin of device.
-maxim,dvs-default-state: Default state of GPIO during initialisation.
		1 for HIGH and 0 for LOW.
-maxim,enable-remote-sense: boolean, enable reote sense.
-maxim,enable-falling-slew-rate: boolean, enable falling slew rate.
-maxim,enable-active-discharge: boolean: enable active discharge.
-maxim,enable-frequency-shift: boolean, enable 9% frequency shift.
-maxim,enable-bias-control: boolean, enable bias control. By enabling this
		startup delay can be reduce to 20us from 220us.
-maxim,enable-etr: boolean, enable Enhanced Transient Response.
-maxim,enable-high-etr-sensitivity: boolean, Enhanced transient response
		circuit is enabled and set for high sensitivity. If this
		property is available then etr will be enable default.

Enhanced transient response (ETR) will affect the configuration of CKADV.

Example:

	max8973@1b {
		compatible = "maxim,max8973";
		reg = <0x1b>;

		regulator-min-microvolt = <935000>;
		regulator-max-microvolt = <1200000>;
		regulator-boot-on;
		regulator-always-on;
	};
