RK816 Power Management Integrated Circuit

Required properties:
- compatible: "rockchip,rk816"
- reg: I2C slave address
- interrupt-parent: The parent interrupt controller.
- interrupts: the interrupt outputs of the controller.
- #clock-cells: from common clock binding; shall be set to 1 (multiple clock
  outputs).

Optional properties:
- clock-output-names: From common clock binding to override the
  default output clock name
- rockchip,system-power-controller: Telling whether or not this pmic is controlling
  the system power.
- gpio-controller: Specifies that the node is a gpio controller when you attempt to
  use the TS pin of RK816 by GPIO general interface.
- #gpio-cells: Should be two. The first cell is the GPIO number and the second cell
  is used to specify the GPIO polarity.
- wakeup-source: Flag to indicate this device can wake system (suspend/resume)
- vcc1-supply:  The input supply for DCDC_REG1
- vcc2-supply:  The input supply for DCDC_REG2
- vcc3-supply:  The input supply for DCDC_REG3
- vcc4-supply:  The input supply for DCDC_REG4
- vcc5-supply:  The input supply for LDO_REG1, LDO_REG2, LDO_REG3
- vcc6-supply:  The input supply for LDO_REG4, LDO_REG5, LDO_REG6

- regulator-initial-mode: default mode to set on startup
- regulator-initial-mode is set as:
	REGULATOR_MODE_FAST			0x1
	REGULATOR_MODE_NORMAL			0x2
Regulators: All the regulators of RK816 to be instantiated shall be
listed in a child node named 'regulators'. Each regulator is represented
by a child node of the 'regulators' node.

	regulator-name {
		/* standard regulator bindings here */
	};

Following regulators of the RK816 PMIC block are supported. Note that
the 'n' in regulator name, as in DCDC_REGn or LDOn, represents the DCDC or LDO
number as described in RK816 datasheet.

	- DCDC_REGn
		- valid values for n are 1 to 4.
	- LDO_REGn
		- valid values for n are 1 to 6.

Standard regulator bindings are used inside regulator subnodes. Check
  Documentation/devicetree/bindings/regulator/regulator.txt
for more details

Gpio, Rtc, Pwrkey: the node are represented like below. When you attempt to enable
  the module, setting the "status" to be "okay", otherwise "disabled".

		rtc {
			status = "okay";
		};

		pwrkey {
			status = "okay";
		};

		gpio {
			status = "okay";
		};

Example:
	rk816: pmic@1a {
		compatible = "rockchip,rk816";
		status = "disabled";
		reg = <0x1a>;
		clock-output-names = "xin32k", "wifibt_32kin";
		interrupt-parent = <&gpio0>;
		interrupts = <1 IRQ_TYPE_LEVEL_LOW>;
		pinctrl-names = "default";
		pinctrl-0 = <&pmic_int>;
		rockchip,system-power-controller;
		wakeup-source;
		#clock-cells = <1>;
		gpio-controller;
		#gpio-cells = <2>;

		vcc1-supply = <&vcc_sys>;
		vcc2-supply = <&vcc_sys>;
		vcc3-supply = <&vcc_sys>;
		vcc4-supply = <&vcc_sys>;
		vcc5-supply = <&vcc_sys>;
		vcc6-supply = <&vcc_sys>;

		rtc {
			status = "okay";
		};

		pwrkey {
			status = "okay";
		};

		gpio {
			status = "okay";
		};

		regulators {
			vdd_cpu: DCDC_REG1 {
				regulator-name = "vdd_logic";
				regulator-always-on;
				regulator-boot-on;
				regulator-min-microvolt = <750000>;
				regulator-max-microvolt = <1450000>;
				regulator-ramp-delay = <6001>;
				regulator-initial-mode = <1>;
				regulator-state-mem {
					regulator-off-in-suspend;
				};
			};
			vdd_gpu: DCDC_REG2 {
				regulator-name = "vdd_gpu";
				regulator-always-on;
				regulator-boot-on;
				regulator-min-microvolt = <800000>;
				regulator-max-microvolt = <1250000>;
				regulator-ramp-delay = <6001>;
				regulator-initial-mode = <1>;
				regulator-state-mem {
					regulator-on-in-suspend;
					regulator-suspend-microvolt = <1000000>;
				};
			};

			vcc_ddr: DCDC_REG3 {
				regulator-always-on;
				regulator-boot-on;
				regulator-name = "vcc_ddr";
				regulator-initial-mode = <1>;
				regulator-state-mem {
					regulator-on-in-suspend;
				};
			};

			vcc33_io: DCDC_REG4 {
				regulator-always-on;
				regulator-boot-on;
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
				regulator-name = "vcc33_io";
				regulator-initial-mode = <1>;
				regulator-state-mem {
					regulator-on-in-suspend;
					regulator-suspend-microvolt = <3300000>;
				};
			};

			vccio_pmu: LDO_REG1 {
				regulator-always-on;
				regulator-boot-on;
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
				regulator-name = "vccio_pmu";
				regulator-state-mem {
					regulator-on-in-suspend;
					regulator-suspend-microvolt = <3300000>;
				};
			};

			vcc_tp: LDO_REG2 {
				regulator-always-on;
				regulator-boot-on;
				regulator-min-microvolt = <3300000>;
				regulator-max-microvolt = <3300000>;
				regulator-name = "vcc_tp";
				regulator-state-mem {
					regulator-off-in-suspend;
				};
			};

			vdd_10: LDO_REG3 {
				regulator-always-on;
				regulator-boot-on;
				regulator-min-microvolt = <1000000>;
				regulator-max-microvolt = <1000000>;
				regulator-name = "vdd_10";
				regulator-state-mem {
					regulator-on-in-suspend;
					regulator-suspend-microvolt = <1000000>;
				};
			};

			vcc18_lcd: LDO_REG4 {
				regulator-always-on;
				regulator-boot-on;
				regulator-min-microvolt = <1800000>;
				regulator-max-microvolt = <1800000>;
				regulator-name = "vcc18_lcd";
				regulator-state-mem {
					regulator-on-in-suspend;
					regulator-suspend-microvolt = <1800000>;
				};
			};

			vccio_sd: LDO_REG5 {
				regulator-always-on;
				regulator-boot-on;
				regulator-min-microvolt = <1800000>;
				regulator-max-microvolt = <3300000>;
				regulator-name = "vccio_sd";
				regulator-state-mem {
					regulator-on-in-suspend;
					regulator-suspend-microvolt = <3300000>;
				};
			};

			vdd10_lcd: LDO_REG6 {
				regulator-always-on;
				regulator-boot-on;
				regulator-min-microvolt = <1000000>;
				regulator-max-microvolt = <1000000>;
				regulator-name = "vdd10_lcd";
				regulator-state-mem {
					regulator-on-in-suspend;
					regulator-suspend-microvolt = <1000000>;
				};
			};

		};
	};