mfd: bd71837: Devicetree bindings for ROHM BD71837 PMIC

* ROHM BD71837 Power Management Integrated Circuit bindings

BD71837MWV is a programmable Power Management IC for powering single-core,

dual-core, and quad-core SoCs such as NXP-i.MX 8M. It is optimized for

low BOM cost and compact solution footprint. It integrates 8 Buck

egulators and 7 LDOs to provide all the power rails required by the SoC and

the commonly used peripherals.

Datasheet for PMIC is available at:

https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e

Required properties:

 - compatible		: Should be "rohm,bd71837".

 - reg			: I2C slave address.

 - interrupt-parent	: Phandle to the parent interrupt controller.

 - interrupts		: The interrupt line the device is connected to.

 - clocks		: The parent clock connected to PMIC. If this is missing

			  32768 KHz clock is assumed.

 - #clock-cells		: Should be 0.

 - regulators:		: List of child nodes that specify the regulators.

			  Please see ../regulator/rohm,bd71837-regulator.txt

Optional properties:

- clock-output-names	: Should contain name for output clock.

Example:

	/* external oscillator node */

	osc: oscillator {

		compatible = "fixed-clock";

		#clock-cells = <1>;

		clock-frequency  = <32768>;

		clock-output-names = "osc";

	};

	pmic: pmic@4b {

		compatible = "rohm,bd71837";

		reg = <0x4b>;

		interrupt-parent = <&gpio1>;

		interrupts = <29 GPIO_ACTIVE_LOW>;

		interrupt-names = "irq";

		#clock-cells = <0>;

		clocks = <&osc 0>;

		clock-output-names = "bd71837-32k-out";

		regulators {

			buck1: BUCK1 {

				regulator-name = "buck1";

				regulator-min-microvolt = <700000>;

				regulator-max-microvolt = <1300000>;

				regulator-boot-on;

				regulator-ramp-delay = <1250>;

			};

		};

	};

	/* Clock consumer node */

	rtc@0 {

		compatible = "company,my-rtc";

		clock-names = "my-clock";

		clocks = <&pmic>;

	};