Maxim MAX77802 multi-function device

The Maxim MAX77802 is a Power Management IC (PMIC) that contains 10 high
efficiency Buck regulators, 32 Low-DropOut (LDO) regulators used to power
up application processors and peripherals, a 2-channel 32kHz clock outputs,
a Real-Time-Clock (RTC) and a I2C interface to program the individual
regulators, clocks outputs and the RTC.

Bindings for the built-in 32k clock generator block and
regulators are defined in ../clk/maxim,max77802.txt and
../regulator/max77802.txt respectively.

Required properties:
- compatible		: Must be "maxim,max77802"
- reg			: Specifies the I2C slave address of PMIC block.
- interrupts		: I2C device IRQ line connected to the main SoC.
- interrupt-parent	: The parent interrupt controller.

Example:

	max77802: pmic@09 {
		compatible = "maxim,max77802";
		interrupt-parent = <&intc>;
		interrupts = <26 IRQ_TYPE_NONE>;
		reg = <0x09>;
	};

Add DT binding for Maxim MAX77802 IC
mfd: Add DT binding for Maxim MAX77802 IC

The MAX77802 is a chip that contains regulators, 2 32kHz clocks,
a RTC and an I2C interface to program the individual components.

The are already DT bindings for the regulators and clocks and
these reference to a bindings/mfd/max77802.txt file, that didn't
exist, for the details about the PMIC.

Signed-off-by: Javier Martinez Canillas <828c1a17681e8566a17a1a4801ea67306010b273@osg.samsung.com>
Reviewed-by: Krzysztof Kozlowski <1a8531307367602b8284517edb33d53d54e5ce8e@samsung.com>
Signed-off-by: Lee Jones <630e34333487a351a857f6b705e04d30b37c1629@linaro.org>
