ARM: dts: imx6sx: enable snvs power key

enable snvs ONOFF power key support
Signed-off-by: Frank Li <Frank.Li@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx6sx.dtsi

@@ -8,6 +8,7 @@
 
 #include <dt-bindings/clock/imx6sx-clock.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include "imx6sx-pinfunc.h"
 #include "skeleton.dtsi"
@@ -678,6 +679,14 @@ snvs_poweroff: snvs-poweroff@38 {
 					reg = <0x38 0x4>;
 					status = "disabled";
 				};
+
+				snvs_pwrkey: snvs-powerkey {
+					compatible = "fsl,sec-v4.0-pwrkey";
+					regmap = <&snvs>;
+					interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
+					linux,keycode = <KEY_POWER>;
+					wakeup;
+				};
 			};
 
 			epit1: epit@020d0000 {