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Dialog Semiconductor DA9150 Combined Charger/Fuel-Gauge MFD bindings

DA9150 consists of a group of sub-devices:

Device			 Description
------			 -----------
da9150-gpadc		: General Purpose ADC
da9150-charger		: Battery Charger
da9150-fg		: Battery Fuel-Gauge

======

Required properties:
- compatible : Should be "dlg,da9150"
- reg: Specifies the I2C slave address
- interrupts: IRQ line info for da9150 chip.
- interrupt-controller: da9150 has internal IRQs (own IRQ domain).
  (See ../interrupt-controller/interrupts.txt for
   further information relating to interrupt properties)

Sub-devices:
- da9150-gpadc: See ../iio/adc/da9150-gpadc.txt
- da9150-charger: See ../power/da9150-charger.txt
- da9150-fg: See ../power/da9150-fg.txt

Example:

	charger_fg: da9150@58 {
		compatible = "dlg,da9150";
		reg = <0x58>;
		interrupt-parent = <&gpio6>;
		interrupts = <11 IRQ_TYPE_LEVEL_LOW>;
		interrupt-controller;

		gpadc: da9150-gpadc {
			compatible = "dlg,da9150-gpadc";
			#io-channel-cells = <1>;
		};

		charger {
			compatible = "dlg,da9150-charger";

			io-channels = <&gpadc 0>,
				      <&gpadc 2>,
				      <&gpadc 8>,
				      <&gpadc 5>;
			io-channel-names = "CHAN_IBUS",
					   "CHAN_VBUS",
					   "CHAN_TJUNC",
					   "CHAN_VBAT";
		};

		fuel-gauge {
			compatible = "dlg,da9150-fuel-gauge";

			dlg,update-interval = <10000>;
			dlg,warn-soc-level = /bits/ 8 <15>;
			dlg,crit-soc-level = /bits/ 8 <5>
		};
	};