ARM: tegra: colibri_t20: iris: add gpio wakeup key

Add SODIMM pin 45 as GPIO wakeup key.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra20-colibri-iris.dts

 // SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
+#include <dt-bindings/input/input.h>
 #include "tegra20-colibri.dtsi"
 
 / {
@@ -177,6 +178,18 @@ backlight: backlight {
 		pwms = <&pwm 0 5000000>; /* PWM<A> */
 	};
 
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		wakeup {
+			label = "SODIMM pin 45 wakeup";
+			gpios = <&gpio TEGRA_GPIO(V, 3) GPIO_ACTIVE_HIGH>;
+			linux,code = <KEY_WAKEUP>;
+			debounce-interval = <10>;
+			wakeup-source;
+		};
+	};
+
 	panel: panel {
 		/*
 		 * edt,et057090dhu: EDT 5.7" LCD TFT