* Hisilicon hi6552 Power Management Integrated Circuit (PMIC)

hi6552 consists of a large and varied group of sub-devices:

Device			 Supply Names	 Description
------			 ------------	 -----------
hi6552-powerkey		:		: Powerkey
hi6552-regulator-pmic	:		: Regulators
hi6552-usbvbus		:		: USB plug detection
hi6552-pmu-rtc		:		: RTC
hi6552-coul		:		: Coulomb

Required properties:
- compatible : Should be "hisilicon,hi6552-pmic-driver"
- reg: Base address of PMIC on hi6220 soc
- #interrupt-cells: Should be 2, is the local IRQ number for hi6552.
- interrupt-controller: hi6552 has internal IRQs (has own IRQ domain).
- pmu_irq_gpio: should be &gpio_pmu_irq_n, is the IRQ gpio of hi6552.

Example:
	pmic: pmic@F8000000 {
                compatible = "hisilicon,hi6552-pmic-driver";
                reg = <0x0 0xF8000000 0x0 0x1000>;
                #interrupt-cells = <2>;
                interrupt-controller;
                pmu_irq_gpio = <&gpio_pmu_irq_n>;
                status = "ok";
                ponkey:ponkey@b1{
                        compatible = "hisilicon,hi6552-powerkey";
                        interrupt-parent = <&pmic>;
                        interrupts = <6 0>, <5 0>, <4 0>;
                        interrupt-names = "down", "up", "hold 1s";
                };
                coul: coul@1 {
                        compatible = "hisilicon,hi6552-coul";
                        interrupt-parent = <&pmic>;
                        interrupts = <24 0>, <25 0>, <26 0>, <27 0>;
                        interrupt-names = "cl_int_i", "cl_out_i", "cl_in_i", "vbat_int_i";
                        battery_product_index = <0>;
                        status = "ok";
                };
                rtc: rtc@1 {
                        compatible = "hisilicon,hi6552-pmu-rtc";
                        interrupt-parent = <&pmic>;
                        interrupts = <20 0>;
                        interrupt-names = "hi6552_pmu_rtc";
                        board_id = <1>;
                };
                usbvbus:usbvbus@b2{
                        compatible = "hisilicon,hi6552-usbvbus";
                        interrupt-parent = <&pmic>;
                        interrupts = <9 0>, <8 0>;
                        interrupt-names = "connect", "disconnect";
                };
		ldo2: regulator@a21 {
                        compatible = "hisilicon,hi6552-regulator-pmic";
                        regulator-name = "ldo2";
                        regulator-min-microvolt = <2500000>;
                        regulator-max-microvolt = <3200000>;
                        hisilicon,valid-modes-mask = <0x02>;
                        hisilicon,valid-ops-mask = <0x01d>;
                        hisilicon,initial-mode = <0x02>;
                        hisilicon,regulator-type = <0x01>;

                        hisilicon,off-on-delay = <120>;
                        hisilicon,ctrl-regs = <0x029 0x02a 0x02b>;
                        hisilicon,ctrl-data = <0x1 0x1>;
                        hisilicon,vset-regs = <0x072>;
                        hisilicon,vset-data = <0 0x3>;
                        hisilicon,regulator-n-vol = <8>;
                        hisilicon,vset-table = <2500000>,<2600000>,<2700000>,<2800000>,<2900000>,<3000000>,<3100000>,<3200000>;
                        hisilicon,num_consumer_supplies = <1>;
                        hisilicon,consumer-supplies = "sensor_analog";
                };
	};