mfd: DT bindings for the palmas family MFD

* palmas device tree bindings

The TI palmas family current members :-

twl6035 (palmas)

twl6037 (palmas)

tps65913 (palmas)

tps65914 (palmas)

Required properties:

- compatible : Should be from the list

  ti,twl6035

  ti,twl6036

  ti,twl6037

  ti,tps65913

  ti,tps65914

  ti,tps80036

and also the generic series names

  ti,palmas

- interrupt-controller : palmas has its own internal IRQs

- #interrupt-cells : should be set to 2 for IRQ number and flags

  The first cell is the IRQ number.

  The second cell is the flags, encoded as the trigger masks from

  Documentation/devicetree/bindings/interrupts.txt

- interrupt-parent : The parent interrupt controller.

Optional properties:

  ti,mux-padX : set the pad register X (1-2) to the correct muxing for the

		hardware, if not set will use muxing in OTP.

Example:

palmas {

	compatible = "ti,twl6035", "ti,palmas";

	reg = <0x48>

	interrupt-parent = <&intc>;

	interrupt-controller;

	#interrupt-cells = <2>;

	ti,mux-pad1 = <0>;

	ti,mux-pad2 = <0>;

	#address-cells = <1>;

	#size-cells = <0>;

	pmic {

		compatible = "ti,twl6035-pmic", "ti,palmas-pmic";

		....

	};

}

* palmas regulator IP block devicetree bindings

Required properties:

- compatible : Should be from the list

  ti,twl6035-pmic

  ti,twl6036-pmic

  ti,twl6037-pmic

  ti,tps65913-pmic

  ti,tps65914-pmic

and also the generic series names

  ti,palmas-pmic

- interrupt-parent : The parent interrupt controller which is palmas.

- interrupts : The interrupt number and the type which can be looked up here:

	       arch/arm/boot/dts/include/dt-bindings/interrupt-controller/irq.h

- interrupts-name: The names of the individual interrupts.

Optional properties:

- ti,ldo6-vibrator : ldo6 is in vibrator mode

Optional nodes:

- regulators : Must contain a sub-node per regulator from the list below.

	       Each sub-node should contain the constraints and initialization

	       information for that regulator. See regulator.txt for a

	       description of standard properties for these sub-nodes.

	       Additional custom properties  are listed below.

	       For ti,palmas-pmic - smps12, smps123, smps3 depending on OTP,

	       smps45, smps457, smps7 depending on variant, smps6, smps[8-10],

	       ldo[1-9], ldoln, ldousb.

	       Optional sub-node properties:

	       ti,warm-reset - maintain voltage during warm reset(boolean)

	       ti,roof-floor - control voltage selection by pin(boolean)

	       ti,sleep-mode - mode to adopt in pmic sleep 0 - off, 1 - auto,

	       2 - eco, 3 - forced pwm

	       ti,tstep - slope control 0 - Jump, 1 10mV/us, 2 5mV/us, 3 2.5mV/us

	       ti,smps-range - OTP has the wrong range set for the hardware so override

	       0 - low range, 1 - high range.

Example:

#include <dt-bindings/interrupt-controller/irq.h>

pmic {

	compatible = "ti,twl6035-pmic", "ti,palmas-pmic";

	interrupt-parent = <&palmas>;

	interrupts = <14 IRQ_TYPE_NONE>;

	interrupts-name = "short-irq";

	ti,ldo6-vibrator;

	regulators {

		smps12_reg : smps12 {

			regulator-name = "smps12";

			regulator-min-microvolt = < 600000>;

			regulator-max-microvolt = <1500000>;

			regulator-always-on;

			regulator-boot-on;

			ti,warm-reset;

			ti,roof-floor;

			ti,mode-sleep = <0>;

			ti,tstep = <0>;

			ti,smps-range = <1>;

		};

		ldo1_reg: ldo1 {

			regulator-name = "ldo1";

			regulator-min-microvolt = <2800000>;

			regulator-max-microvolt = <2800000>;

		};

	};

};