arm64: tegra: Add gpio-keys on Jetson Xavier

The power and force recovery buttons found on Jetson Xavier are hooked
up to two Tegra GPIOs. The power button can also function as a wake-up
source.

Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts

@@ -1,6 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
 /dts-v1/;
 
+#include <dt-bindings/input/linux-event-codes.h>
+#include <dt-bindings/input/gpio-keys.h>
+
 #include "tegra194-p2888.dtsi"
 
 / {
@@ -54,6 +57,30 @@
 		#cooling-cells = <2>;
 	};
 
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		force-recovery {
+			label = "Force Recovery";
+			gpios = <&gpio TEGRA194_MAIN_GPIO(G, 0)
+				       GPIO_ACTIVE_LOW>;
+			linux,input-type = <EV_KEY>;
+			linux,code = <BTN_1>;
+			debounce-interval = <10>;
+		};
+
+		power {
+			label = "Power";
+			gpios = <&gpio_aon TEGRA194_AON_GPIO(EE, 4)
+					   GPIO_ACTIVE_LOW>;
+			linux,input-type = <EV_KEY>;
+			linux,code = <KEY_POWER>;
+			debounce-interval = <10>;
+			wakeup-event-action = <EV_ACT_ASSERTED>;
+			wakeup-source;
+		};
+	};
+
 	thermal-zones {
 		cpu {
 			polling-delay = <0>;