ARM: dts: omap3-devkit8000: Add user button support

This patch links the user button to the BTN_EXTRA action.
Signed-off-by: Anthoine Bourgeois <anthoine.bourgeois@gmail.com>
[tony@atomide.com: added missing sign as noted by Anthoine]
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap3-devkit8000.dts

@@ -7,6 +7,8 @@
  */
 /dts-v1/;
 
+#include <dt-bindings/input/input.h>
+
 #include "omap34xx.dtsi"
 / {
 	model = "TimLL OMAP3 Devkit8000";
@@ -54,6 +56,17 @@ sound {
 			"MAINMIC", "Main Mic",
 			"Main Mic", "Mic Bias 1";
 	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+
+		user {
+			label = "user";
+			gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;
+			linux,code = <BTN_EXTRA>;
+			gpio-key,wakeup;
+		};
+	};
 };
 
 &i2c1 {