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MAX77620 Power management IC from Maxim Semiconductor.

Required properties:
-------------------
- compatible: Must be one of
		"maxim,max77620"
		"maxim,max20024"
		"maxim,max77663"
- reg: I2C device address.

Optional properties:
-------------------
- interrupts:		The interrupt on the parent the controller is
			connected to.
- interrupt-controller: Marks the device node as an interrupt controller.
- #interrupt-cells:	is <2> and their usage is compliant to the 2 cells
			variant of <../interrupt-controller/interrupts.txt>
			IRQ numbers for different interrupt source of MAX77620
			are defined at dt-bindings/mfd/max77620.h.

- system-power-controller: Indicates that this PMIC is controlling the
			   system power, see [1] for more details.

[1] Documentation/devicetree/bindings/power/power-controller.txt

Optional subnodes and their properties:
=======================================

Flexible power sequence configurations:
--------------------------------------
The Flexible Power Sequencer (FPS) allows each regulator to power up under
hardware or software control. Additionally, each regulator can power on
independently or among a group of other regulators with an adjustable power-up
and power-down delays (sequencing). GPIO1, GPIO2, and GPIO3 can be programmed
to be part of a sequence allowing external regulators to be sequenced along
with internal regulators. 32KHz clock can be programmed to be part of a
sequence.

The flexible sequencing structure consists of two hardware enable inputs
(EN0, EN1), and 3 master sequencing timers called FPS0, FPS1 and FPS2.
Each master sequencing timer is programmable through its configuration
register to have a hardware enable source (EN1 or EN2) or a software enable
source (SW). When enabled/disabled, the master sequencing timer generates
eight sequencing events on different time periods called slots. The time
period between each event is programmable within the configuration register.
Each regulator, GPIO1, GPIO2, GPIO3, and 32KHz clock has a flexible power
sequence slave register which allows its enable source to be specified as
a flexible power sequencer timer or a software bit. When a FPS source of
regulators, GPIOs and clocks specifies the enable source to be a flexible
power sequencer, the power up and power down delays can be specified in
the regulators, GPIOs and clocks flexible power sequencer configuration
registers.

When FPS event cleared (set to LOW), regulators, GPIOs and 32KHz
clock are set into following state at the sequencing event that
corresponds to its flexible sequencer configuration register.
	Sleep state: 			In this state, regulators, GPIOs
					and 32KHz clock get disabled at
					the sequencing event.
	Global Low Power Mode (GLPM):	In this state, regulators are set in
					low power mode at the sequencing event.

The configuration parameters of FPS is provided through sub-node "fps"
and their child for FPS specific. The child node name for FPS are "fps0",
"fps1", and "fps2" for FPS0, FPS1 and FPS2 respectively.

The FPS configurations like FPS source, power up and power down slots for
regulators, GPIOs and 32kHz clocks are provided in their respective
configuration nodes which is explained in respective sub-system DT
binding document.

There is need for different FPS configuration parameters based on system
state like when system state changed from active to suspend or active to
power off (shutdown).

Optional properties:
-------------------
-maxim,fps-event-source:		u32, FPS event source like external
					hardware input to PMIC i.e. EN0, EN1 or
					software (SW).
					The macros are defined on
						dt-bindings/mfd/max77620.h
					for different control source.
					- MAX77620_FPS_EVENT_SRC_EN0
						for hardware input pin EN0.
					- MAX77620_FPS_EVENT_SRC_EN1
						for hardware input pin EN1.
					- MAX77620_FPS_EVENT_SRC_SW
						for software control.

-maxim,shutdown-fps-time-period-us:	u32, FPS time period in microseconds
					when system enters in to shutdown
					state.

-maxim,suspend-fps-time-period-us:	u32, FPS time period in microseconds
					when system enters in to suspend state.

-maxim,device-state-on-disabled-event:	u32, describe the PMIC state when FPS
					event cleared (set to LOW) whether it
					should go to sleep state or low-power
					state. Following are valid values:
					- MAX77620_FPS_INACTIVE_STATE_SLEEP
						to set the PMIC state to sleep.
					- MAX77620_FPS_INACTIVE_STATE_LOW_POWER
						to set the PMIC state to low
						power.
					Absence of this property or other value
					will not change device state when FPS
					event get cleared.

Here supported time periods by device in microseconds are as follows:
MAX77620 supports 40, 80, 160, 320, 640, 1280, 2560 and 5120 microseconds.
MAX20024 supports 20, 40, 80, 160, 320, 640, 1280 and 2540 microseconds.
MAX77663 supports 20, 40, 80, 160, 320, 640, 1280 and 2540 microseconds.

-maxim,power-ok-control: configure map power ok bit
			1: Enables POK(Power OK) to control nRST_IO and GPIO1
			POK function.
			0: Disables POK control.
			if property missing, do not configure MPOK bit.
			If POK mapping is enabled for GPIO1/nRST_IO then,
			GPIO1/nRST_IO pins are HIGH only if all rails
			that have POK control enabled are HIGH.
			If any of the rails goes down(which are enabled for POK
			control) then, GPIO1/nRST_IO goes LOW.
			this property is valid for max20024 only.

For DT binding details of different sub modules like GPIO, pincontrol,
regulator, power, please refer respective device-tree binding document
under their respective sub-system directories.

Example:
--------
#include <dt-bindings/mfd/max77620.h>

max77620@3c {
	compatible = "maxim,max77620";
	reg = <0x3c>;

	interrupt-parent = <&intc>;
	interrupts = <0 86 IRQ_TYPE_NONE>;

	interrupt-controller;
	#interrupt-cells = <2>;

	fps {
		fps0 {
			maxim,shutdown-fps-time-period-us = <1280>;
			maxim,fps-event-source = <MAX77620_FPS_EVENT_SRC_EN1>;
		};

		fps1 {
			maxim,shutdown-fps-time-period-us = <1280>;
			maxim,fps-event-source = <MAX77620_FPS_EVENT_SRC_EN0>;
		};

		fps2 {
			maxim,shutdown-fps-time-period-us = <1280>;
			maxim,fps-event-source = <MAX77620_FPS_EVENT_SRC_SW>;
		};
	};
};