bq2477x charger
~~~~~~~~~~~~~~~

Required properties :
 - compatible : should contain "ti,bq2477x".
 - ti,dac-ichg : Charge current that must be programmed
 - ti,dac-v : The maximum charge voltage that must be programmed
 - ti,dac-minsv : The minimum System voltage that must be programmed
 - ti,dac-iin : The input current that must be programmed
 - ti,wdt-refresh-timeout : watch dog timer that must be programmed
 - charger-detect-gpio : the GPIO used for AC adapter detection
 - ti,charger-detect-gpio-active-low : The flag that determines if AC adapter
	presence is indicated by active low. Set this to 1 if active low
	indicates adapter is present, else 0.

Example:

	bq2477x@6a {
		compatible = "ti,bq2477x";
		reg = <0x6a>;
		ti,dac-ichg = <2240>;
		ti,dac-v = <9008>;
		ti,dac-minsv = <4608>;
		ti,dac-iin = <4992>;
		ti,wdt-refresh-timeout = <40>;
		charger-detect-gpio = <&gpio 85 0>;
		ti,charger-detect-gpio-active-low = <1>;
	 };
