Regulator DT binding for MAX77620 Power management IC from Maxim Semiconductor.

Device has multiple DCDC(sd[0-3] and LDOs(ldo[0-8]). The input supply
of these regulators are defined under parent device node.
Details of regulator properties are defined as child node under
sub-node "regulators" which is child node of device node.

Please refer file <Documentation/devicetree/bindings/regulator/regulator.txt>
for common regulator bindings used by client.

Following are properties of parent node related to regulators.

Optional properties:
-------------------
The input supply of regulators are the optional properties on the
parent device node. The input supply of these regulators are provided
through following properties:
in-sd0-supply:		Input supply for SD0, INA-SD0 or INB-SD0 pins.
in-sd1-supply:		Input supply for SD1.
in-sd2-supply:		Input supply for SD2.
in-sd3-supply:		Input supply for SD3.
in-ldo0-1-supply:	Input supply for LDO0 and LDO1.
in-ldo2-supply:		Input supply for LDO2.
in-ldo3-5-supply:	Input supply for LDO3 and LDO5
in-ldo4-6-supply:	Input supply for LDO4 and LDO6.
in-ldo7-8-supply:	Input supply for LDO7 and LDO8.

Optional sub nodes for regulators under "regulators" subnode:
------------------------------------------------------------
The subnodes name is the name of regulator and it must be one of:
	sd[0-3], ldo[0-8]

Each sub-node should contain the constraints and initialization
information for that regulator. The definition for each of these
nodes is defined using the standard binding for regulators found at
<Documentation/devicetree/bindings/regulator/regulator.txt>.

Theres are also additional properties for SD/LDOs. These additional properties
are required to configure FPS configuration parameters for SDs and LDOs.
Please refer <devicetree/bindings/mfd/max77620.txt> for more detail of Flexible
Power Sequence (FPS).
Following are additional properties:

- maxim,active-fps-source:		FPS source for the regulators to get
					enabled/disabled when system is in
					active state.  Valid values are:
					- MAX77620_FPS_SRC_0,
						FPS source is FPS0.
					- MAX77620_FPS_SRC_1,
						FPS source is FPS1
					- MAX77620_FPS_SRC_2 and
						FPS source is FPS2
					- MAX77620_FPS_SRC_NONE.
						Regulator is not controlled
						by FPS events and it gets
						enabled/disabled by register
						access.
					Absence of this property will leave
					the FPS configuration register for that
					regulator to default configuration.

- maxim,active-fps-power-up-slot:	Sequencing event slot number on which
					the regulator get enabled when
					master FPS input event set to HIGH.
					Valid values are 0 to 7.
					This is applicable if FPS source is
					selected as FPS0, FPS1 or FPS2.
			
- maxim,active-fps-power-down-slot:	Sequencing event slot number on which
					the regulator get disabled when master
					FPS input event set to LOW.
					Valid values are 0 to 7.
					This is applicable if FPS source is
					selected as FPS0, FPS1 or FPS2.
			
- maxim,suspend-fps-source:		This is same as property
					"maxim,active-fps-source" but value
					get configured when system enters in
					to suspend state.

- maxim,suspend-fps-power-up-slot:	This is same as property
					"maxim,active-fps-power-up-slot" but
					this value get configured into FPS
					configuration register when system
					enters into suspend.
					This is applicable if suspend state
					FPS source is selected as FPS0, FPS1 or

- maxim,suspend-fps-power-down-slot:	This is same as property
					"maxim,active-fps-power-down-slot" but
					this value get configured into FPS
					configuration register when system
					enters into suspend.
					This is applicable if suspend state
					FPS source is selected as FPS0, FPS1 or
					FPS2.

Example:
--------
#include <dt-bindings/mfd/max77620.h>
...
max77620@3c {
	in-ldo0-1-supply = <&max77620_sd2>;
	in-ldo7-8-supply = <&max77620_sd2>;
	regulators {
		sd0 {
			regulator-name = "vdd-core";
			regulator-min-microvolt = <600000>;
			regulator-max-microvolt = <1400000>;
			regulator-boot-on;
			regulator-always-on;
			maxim,active-fps-source = <MAX77620_FPS_SRC_1>;
		};

		sd1 {
			regulator-name = "vddio-ddr";
			regulator-min-microvolt = <1200000>;
			regulator-max-microvolt = <1200000>;
			regulator-always-on;
			regulator-boot-on;
			maxim,active-fps-source = <MAX77620_FPS_SRC_0>;
		};

		sd2 {
			regulator-name = "vdd-pre-reg";
			regulator-min-microvolt = <1350000>;
			regulator-max-microvolt = <1350000>;
		};

		sd3 {
			regulator-name = "vdd-1v8";
			regulator-min-microvolt = <1800000>;
			regulator-max-microvolt = <1800000>;
			regulator-always-on;
			regulator-boot-on;
		};

		ldo0 {
			regulator-name = "avdd-sys";
			regulator-min-microvolt = <1200000>;
			regulator-max-microvolt = <1200000>;
			regulator-always-on;
			regulator-boot-on;
		};

		ldo1 {
			regulator-name = "vdd-pex";
			regulator-min-microvolt = <1050000>;
			regulator-max-microvolt = <1050000>;
		};

		ldo2 {
			regulator-name = "vddio-sdmmc3";
			regulator-min-microvolt = <1800000>;
			regulator-max-microvolt = <3300000>;
		};

		ldo3 {
			regulator-name = "vdd-cam-hv";
			regulator-min-microvolt = <2800000>;
			regulator-max-microvolt = <2800000>;
		};

		ldo4 {
			regulator-name = "vdd-rtc";
			regulator-min-microvolt = <1250000>;
			regulator-max-microvolt = <1250000>;
			regulator-always-on;
			regulator-boot-on;
		};

		ldo5 {
			regulator-name = "avdd-ts-hv";
			regulator-min-microvolt = <3000000>;
			regulator-max-microvolt = <3000000>;
		};

		ldo6 {
			regulator-name = "vdd-ts";
			regulator-min-microvolt = <1800000>;
			regulator-max-microvolt = <1800000>;
			regulator-always-on;
			regulator-boot-on;
		};

		ldo7 {
			regulator-name = "vdd-gen-pll-edp";
			regulator-min-microvolt = <1050000>;
			regulator-max-microvolt = <1050000>;
			regulator-always-on;
			regulator-boot-on;
		};

		ldo8 {
			regulator-name = "vdd-hdmi-dp";
			regulator-min-microvolt = <1050000>;
			regulator-max-microvolt = <1050000>;
		};
	};
};