Mediatek MT6397 Regulator Driver

Required properties:
- compatible: "mediatek,mt6397-regulator"
- mt6397regulator: List of regulators provided by this controller. It is named
  according to its regulator type, buck_<name> and ldo_<name>.
  The definition for each of these nodes is defined using the standard binding
  for regulators at Documentation/devicetree/bindings/regulator/regulator.txt.

The valid names for regulators are::
BUCK:
  buck_vpca15, buck_vpca7, buck_vsramca15, buck_vsramca7, buck_vcore, buck_vgpu,
  buck_vdrm, buck_vio18
LDO:
  ldo_vtcxo, ldo_va28, ldo_vcama, ldo_vio28, ldo_vusb, ldo_vmc, ldo_vmch,
  ldo_vemc3v3, ldo_vgp1, ldo_vgp2, ldo_vgp3, ldo_vgp4, ldo_vgp5, ldo_vgp6,
  ldo_vibr

Example:
	pmic {
		compatible = "mediatek,mt6397";

		mt6397regulator: mt6397regulator {
			compatible = "mediatek,mt6397-regulator";

			mt6397_vpca15_reg: buck_vpca15 {
				regulator-compatible = "buck_vpca15";
				regulator-name = "vpca15";
				regulator-min-microvolt = < 850000>;
				regulator-max-microvolt = <1350000>;
				regulator-ramp-delay = <12500>;
				regulator-enable-ramp-delay = <200>;
			};

			mt6397_vpca7_reg: buck_vpca7 {
				regulator-compatible = "buck_vpca7";
				regulator-name = "vpca7";
				regulator-min-microvolt = < 850000>;
				regulator-max-microvolt = <1350000>;
				regulator-ramp-delay = <12500>;
				regulator-enable-ramp-delay = <115>;
			};

			mt6397_vsramca15_reg: buck_vsramca15 {
				regulator-compatible = "buck_vsramca15";
				regulator-name = "vsramca15";
				regulator-min-microvolt = < 850000>;
				regulator-max-microvolt = <1350000>;
				regulator-ramp-delay = <12500>;
				regulator-enable-ramp-delay = <115>;

			};

			mt6397_vsramca7_reg: buck_vsramca7 {
				regulator-compatible = "buck_vsramca7";
				regulator-name = "vsramca7";
				regulator-min-microvolt = < 850000>;
				regulator-max-microvolt = <1350000>;
				regulator-ramp-delay = <12500>;
				regulator-enable-ramp-delay = <115>;

			};

			mt6397_vcore_reg: buck_vcore {
				regulator-compatible = "buck_vcore";
				regulator-name = "vcore";
				regulator-min-microvolt = < 850000>;
				regulator-max-microvolt = <1350000>;
				regulator-ramp-delay = <12500>;
				regulator-enable-ramp-delay = <115>;
			};

			mt6397_vgpu_reg: buck_vgpu {
				regulator-compatible = "buck_vgpu";
				regulator-name = "vgpu";
				regulator-min-microvolt = < 700000>;
				regulator-max-microvolt = <1350000>;
				regulator-ramp-delay = <12500>;
				regulator-enable-ramp-delay = <115>;
			};

			mt6397_vdrm_reg: buck_vdrm {
				regulator-compatible = "buck_vdrm";
				regulator-name = "vdrm";
				regulator-min-microvolt = < 800000>;
				regulator-max-microvolt = <1400000>;
				regulator-ramp-delay = <12500>;
				regulator-enable-ramp-delay = <500>;
			};

			mt6397_vio18_reg: buck_vio18 {
				regulator-compatible = "buck_vio18";
				regulator-name = "vio18";
				regulator-min-microvolt = <1500000>;
				regulator-max-microvolt = <2120000>;
				regulator-ramp-delay = <12500>;
				regulator-enable-ramp-delay = <500>;
			};

			mt6397_vtcxo_reg: ldo_vtcxo {
				regulator-compatible = "ldo_vtcxo";
				regulator-name = "vtcxo";
				regulator-min-microvolt = <2800000>;
				regulator-max-microvolt = <2800000>;
				regulator-enable-ramp-delay = <90>;
			};

			mt6397_va28_reg: ldo_va28 {
				regulator-compatible = "ldo_va28";
				regulator-name = "va28";
				/* fixed output 2.8 V */
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vcama_reg: ldo_vcama {
				regulator-compatible = "ldo_vcama";
				regulator-name = "vcama";
				regulator-min-microvolt = <1500000>;
				regulator-max-microvolt = <2800000>;
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vio28_reg: ldo_vio28 {
				regulator-compatible = "ldo_vio28";
				regulator-name = "vio28";
				/* fixed output 2.8 V */
				regulator-enable-ramp-delay = <240>;
			};

			mt6397_usb_reg: ldo_vusb {
				regulator-compatible = "ldo_vusb";
				regulator-name = "vusb";
				/* fixed output 3.3 V */
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vmc_reg: ldo_vmc {
				regulator-compatible = "ldo_vmc";
				regulator-name = "vmc";
				regulator-min-microvolt = <1800000>;
				regulator-max-microvolt = <3300000>;
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vmch_reg: ldo_vmch {
				regulator-compatible = "ldo_vmch";
				regulator-name = "vmch";
				regulator-min-microvolt = <3000000>;
				regulator-max-microvolt = <3300000>;
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vemc_3v3_reg: ldo_vemc3v3 {
				regulator-compatible = "ldo_vemc3v3";
				regulator-name = "vemc_3v3";
				regulator-min-microvolt = <3000000>;
				regulator-max-microvolt = <3300000>;
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vgp1_reg: ldo_vgp1 {
				regulator-compatible = "ldo_vgp1";
				regulator-name = "vcamd";
				regulator-min-microvolt = <1220000>;
				regulator-max-microvolt = <3300000>;
				regulator-enable-ramp-delay = <240>;
			};

			mt6397_vgp2_reg: ldo_vgp2 {
				egulator-compatible = "ldo_vgp2";
				regulator-name = "vcamio";
				regulator-min-microvolt = <1000000>;
				regulator-max-microvolt = <3300000>;
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vgp3_reg: ldo_vgp3 {
				regulator-compatible = "ldo_vgp3";
				regulator-name = "vcamaf";
				regulator-min-microvolt = <1200000>;
				regulator-max-microvolt = <3300000>;
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vgp4_reg: ldo_vgp4 {
				regulator-compatible = "ldo_vgp4";
				regulator-name = "vgp4";
				regulator-min-microvolt = <1200000>;
				regulator-max-microvolt = <3300000>;
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vgp5_reg: ldo_vgp5 {
				regulator-compatible = "ldo_vgp5";
				regulator-name = "vgp5";
				regulator-min-microvolt = <1200000>;
				regulator-max-microvolt = <3000000>;
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vgp6_reg: ldo_vgp6 {
				regulator-compatible = "ldo_vgp6";
				regulator-name = "vgp6";
				regulator-min-microvolt = <1200000>;
				regulator-max-microvolt = <3300000>;
				regulator-enable-ramp-delay = <218>;
			};

			mt6397_vibr_reg: ldo_vibr {
				regulator-compatible = "ldo_vibr";
				regulator-name = "vibr";
				regulator-min-microvolt = <1200000>;
				regulator-max-microvolt = <3300000>;
				regulator-enable-ramp-delay = <218>;
			};
		};
	};