STC311x Fuel Gauge device

STC311x FG provides interface to clients to read properties related
to the battery. Its main function is to retrieve the State of Charge (SOC),
a 0-100 percentage representing the amount of charge left in the battery.

- compatible
	Usage:		Required
	Value:		<string>
	Definition:	Must be  "st,stc311x" for the driver.

- reg
	Usage:		Required
	Value:		<u32>
	Definition:	The device 7-bit I2C address.

- st,float-voltage-mv
	Usage:		Required
	Value type:	<u32> in mV.
	Definition:	Float Voltage in mV - the maximum voltage up to which
			the battery is charged.

- st,rsense-mohm
	Usage:		Required
	Value type:	<u32> in mohm.
	Definition:	Current sense resistance value.

- st,nom-capacity-mah
	Usage:		Required
	Value type:	<u32> in mah.
	Definition:	This specifies nominal capacity of battery.

- st,rbatt-mohm
	Usage:		Required
	Value type:	<u32> in mohm.
	Definition:	This specifies battery internal resistance.

- st,ocv-tbl
	Usage:		Required
	Value type:	<u16 array> in mV.
	Definition:	This specifies an array of battery open circuit voltages at
			different SOC points.

- st,soc-tbl
	Usage:		Required
	Value type:	<u8 array>.
	Definition:	This specifies an array of SOC points associated with
			OCV table.

- st,vmtemp-tbl
	Usage:		Required
	Value type:	<u16 array>
	Definition:	This specifies an array of VCNF compensation table at
			different temperatures.

- st,temp-tbl
	Usage:		Required
	Value type:	<s16 array in DeciDegC>
	Definition:	This specifies an array of temperature points used in
			vtemp table and adaptive capacity tables.

- st,cutoff-voltage-mv
	Usage:		Optional
	Value type:	<u32> in mV
	Definition:	This is the minimum allowed system voltage. The FG
			will report SOC = 0 at this volatge. This value is
			also used to configure alarm voltage threshold.
			If not specified default value is set to 3400mV.

- st,alarm-soc
	Usage:		Optional
	Value type:	<u32> in %
	Definition:	This is the alarm SOC threshold.
			If not specified default value is set to 10%.

- st,term-current-ma
	Usage:		Optional
	Value type:	<u32> in mA
	Definition:	This is the maximum current threshold limit used to
			decide end of charge.
			If not specified value is set to

- st,relax-current-ma
	Usage:		Optional
	Value type:	<u32> in mA
	Definition:	This is the current threshold to decide automatic mode
			switch between voltage and moxec mode.
			If not specified value is set to

- st,adaptive-capacity-tbl
	Usage:		Optional
	Value type:	<u16 array, each element is in 0.1%>
	Definition:	This table specifies capacity degradation with
			temperature.

- st,force-voltage-mode
	Usage:		Optional
	Value type:	Boolean
	Definition:	This is to force FG always in low power voltage mode.

- st,enable-soc-correction
	Usage:		Optional
	Value type:	Boolean
	Definition:	This is to enable soc correction algorithm.

-st,empty-soc-uv
	Usage:		Optional
	Value type:	<u32> in uV
	Definition:	This is the battery voltage threshold to reporting 0%
			SOC. If this property is present then 'qcom,fg-adc_tm'
			and 'qcom,fg-vadc' are required properties.

-qcom,fg-adc_tm
	Usage:		Optional
	Value type:	<phandle>
	Definition:	ADC_TM device's phandle to receive notifications when
			battery voltage crosses configured thresholds.

- qcom,fg-vadc
	Usage:		Optional
	Value type:	<phandle>
	Definition:	VADC device's phandle to read battery voltage using
			ADC channel.

Example:
	st-fg@70 {
		compatible = "st,stc3117";
		reg = <0x70>;

		st,rbatt-mohm = <210>;
		st,nom-capacity-mah = <1500>;
		st,rsense-mohm = <10>;
		st,float-voltage-mv = <4200>;

		st,alarm-soc = <10>;
		st,alarm-voltage-mv = <3400>;

		st,term-current-ma = <150>;
		st,relax-current-ma = <200>;

		st,adaptive-capacity-tbl = /bits/ 16 <0 0 0 5 13 42 71>;
		st,ocv-tbl = /bits/ 16 <3300 3528 3667 3731 3753 3765 3772
					3792 3827 3900 3929 3957 3513 4072
					4167>;
		st,soc-tbl = /bits/ 8 <0 3 6 10 15 20 25 30 40 50 60 65
					70 80 90 100>;
		st,vmtemp-tbl = /bits/ 16 <85 90 100 160 320 440 840>
		st,temp-tbl = /bits/ 16 <60 40 25 10 0 (-10) (-20)>;

		st,empty-soc-uv = <3300000>;
		qcom,fg-vadc = <&pm8916_vadc>;
		qcom,fg-adc_tm = <&pm8916_adc_tm>;
	};