ROHM BD71837 Power Management Integrated Circuit (PMIC) regulator bindings

Required properties:
 - regulator-name: should be "buck1", ..., "buck8" and "ldo1", ..., "ldo7"

List of regulators provided by this controller. BD71837 regulators node
should be sub node of the BD71837 MFD node. See BD71837 MFD bindings at
Documentation/devicetree/bindings/mfd/rohm,bd71837-pmic.txt
Regulator nodes should be named to BUCK_<number> and LDO_<number>. The
definition for each of these nodes is defined using the standard
binding for regulators at
Documentation/devicetree/bindings/regulator/regulator.txt.
Note that if BD71837 starts at RUN state you probably want to use
regulator-boot-on at least for BUCK6 and BUCK7 so that those are not
disabled by driver at startup. LDO5 and LDO6 are supplied by those and
if they are disabled at startup the voltage monitoring for LDO5/LDO6 will
cause PMIC to reset.

The valid names for regulator nodes are:
BUCK1, BUCK2, BUCK3, BUCK4, BUCK5, BUCK6, BUCK7, BUCK8
LDO1, LDO2, LDO3, LDO4, LDO5, LDO6, LDO7

Optional properties:
- Any optional property defined in bindings/regulator/regulator.txt

Example:
regulators {
	buck1: BUCK1 {
		regulator-name = "buck1";
		regulator-min-microvolt = <700000>;
		regulator-max-microvolt = <1300000>;
		regulator-boot-on;
		regulator-ramp-delay = <1250>;
	};
	buck2: BUCK2 {
		regulator-name = "buck2";
		regulator-min-microvolt = <700000>;
		regulator-max-microvolt = <1300000>;
		regulator-boot-on;
		regulator-always-on;
		regulator-ramp-delay = <1250>;
	};
	buck3: BUCK3 {
		regulator-name = "buck3";
		regulator-min-microvolt = <700000>;
		regulator-max-microvolt = <1300000>;
		regulator-boot-on;
	};
	buck4: BUCK4 {
		regulator-name = "buck4";
		regulator-min-microvolt = <700000>;
		regulator-max-microvolt = <1300000>;
		regulator-boot-on;
	};
	buck5: BUCK5 {
		regulator-name = "buck5";
		regulator-min-microvolt = <700000>;
		regulator-max-microvolt = <1350000>;
		regulator-boot-on;
	};
	buck6: BUCK6 {
		regulator-name = "buck6";
		regulator-min-microvolt = <3000000>;
		regulator-max-microvolt = <3300000>;
		regulator-boot-on;
	};
	buck7: BUCK7 {
		regulator-name = "buck7";
		regulator-min-microvolt = <1605000>;
		regulator-max-microvolt = <1995000>;
		regulator-boot-on;
	};
	buck8: BUCK8 {
		regulator-name = "buck8";
		regulator-min-microvolt = <800000>;
		regulator-max-microvolt = <1400000>;
	};

	ldo1: LDO1 {
		regulator-name = "ldo1";
		regulator-min-microvolt = <3000000>;
		regulator-max-microvolt = <3300000>;
		regulator-boot-on;
	};
	ldo2: LDO2 {
		regulator-name = "ldo2";
		regulator-min-microvolt = <900000>;
		regulator-max-microvolt = <900000>;
		regulator-boot-on;
	};
	ldo3: LDO3 {
		regulator-name = "ldo3";
		regulator-min-microvolt = <1800000>;
		regulator-max-microvolt = <3300000>;
	};
	ldo4: LDO4 {
		regulator-name = "ldo4";
		regulator-min-microvolt = <900000>;
		regulator-max-microvolt = <1800000>;
	};
	ldo5: LDO5 {
		regulator-name = "ldo5";
		regulator-min-microvolt = <1800000>;
		regulator-max-microvolt = <3300000>;
	};
	ldo6: LDO6 {
		regulator-name = "ldo6";
		regulator-min-microvolt = <900000>;
		regulator-max-microvolt = <1800000>;
	};
	ldo7_reg: LDO7 {
		regulator-name = "ldo7";
		regulator-min-microvolt = <1800000>;
		regulator-max-microvolt = <3300000>;
	};
};