twl4030_charger: Add devicetree support

This allows the charger to be enabled with devicetree, and allows the
parameters for charging the backup battery to be set.

Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Kumar Gala <galak@codeaurora.org>
Acked-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>

arch/arm/boot/dts/twl4030.dtsi

@@ -19,6 +19,12 @@
 		interrupts = <11>;
 	};
 
+	charger: bci {
+		compatible = "ti,twl4030-bci";
+		interrupts = <9>, <2>;
+		bci3v1-supply = <&vusb3v1>;
+	};
+
 	watchdog {
 		compatible = "ti,twl4030-wdt";
 	};