ARM: dts: twl6030: describe gpadc

tested on Pandaboard ES.
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/twl6030.dtsi

@@ -99,4 +99,10 @@ twl_pwmled: pwmled {
 		compatible = "ti,twl6030-pwmled";
 		#pwm-cells = <2>;
 	};
+
+	gpadc {
+		compatible = "ti,twl6030-gpadc";
+		interrupts = <3>;
+		#io-channel-cells = <1>;
+	};
 };