regulator: act8865: add device tree binding doc

ACT8865 regulator

-------------------

Required properties:

- compatible: "active-semi,act8865"

- reg: I2C slave address

Any standard regulator properties can be used to configure the single regulator.

The valid names for regulators are:

	DCDC_REG1, DCDC_REG2, DCDC_REG3, LDO_REG1, LDO_REG2, LDO_REG3, LDO_REG4.

Example:

--------

		i2c1: i2c@f0018000 {

			pmic: act8865@5b {

				compatible = "active-semi,act8865";

				reg = <0x5b>;

				status = "disabled";

				regulators {

					vcc_1v8_reg: DCDC_REG1 {

						regulator-name = "VCC_1V8";

						regulator-min-microvolt = <1800000>;

						regulator-max-microvolt = <1800000>;

						regulator-always-on;

					};

					vcc_1v2_reg: DCDC_REG2 {

						regulator-name = "VCC_1V2";

						regulator-min-microvolt = <1100000>;

						regulator-max-microvolt = <1300000>;

						regulator-suspend-mem-microvolt = <1150000>;

						regulator-suspend-standby-microvolt = <1150000>;

						regulator-always-on;

					};

					vcc_3v3_reg: DCDC_REG3 {

						regulator-name = "VCC_3V3";

						regulator-min-microvolt = <3300000>;

						regulator-max-microvolt = <3300000>;

						regulator-always-on;

					};

					vddana_reg: LDO_REG1 {

						regulator-name = "VDDANA";

						regulator-min-microvolt = <3300000>;

						regulator-max-microvolt = <3300000>;

						regulator-always-on;

					};

					vddfuse_reg: LDO_REG2 {

						regulator-name = "FUSE_2V5";

						regulator-min-microvolt = <2500000>;

						regulator-max-microvolt = <2500000>;

					};

				};

			};

		};

This isn't an exhaustive list, but you should add new prefixes to it before

using them to avoid name-space collisions.

active-semi	Active-Semi International Inc

ad	Avionic Design GmbH

adi	Analog Devices, Inc.

aeroflexgaisler	Aeroflex Gaisler AB