ARM: dts: alt: Add SW2 as GPIO keys

SW2 on Alt is connected as on Lager board. So, use the same GPIO
settings.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20210525091512.29119-1-wsa+renesas@sang-engineering.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm/boot/dts/r8a7794-alt.dts

@@ -8,6 +8,7 @@
 /dts-v1/;
 #include "r8a7794.dtsi"
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 
 / {
 	model = "Alt";
@@ -94,6 +95,42 @@ lbsc {
 		#size-cells = <1>;
 	};
 
+	keyboard {
+		compatible = "gpio-keys";
+
+		pinctrl-0 = <&keyboard_pins>;
+		pinctrl-names = "default";
+
+		one {
+			linux,code = <KEY_1>;
+			label = "SW2-1";
+			wakeup-source;
+			debounce-interval = <20>;
+			gpios = <&gpio3 9 GPIO_ACTIVE_LOW>;
+		};
+		two {
+			linux,code = <KEY_2>;
+			label = "SW2-2";
+			wakeup-source;
+			debounce-interval = <20>;
+			gpios = <&gpio3 10 GPIO_ACTIVE_LOW>;
+		};
+		three {
+			linux,code = <KEY_3>;
+			label = "SW2-3";
+			wakeup-source;
+			debounce-interval = <20>;
+			gpios = <&gpio3 11 GPIO_ACTIVE_LOW>;
+		};
+		four {
+			linux,code = <KEY_4>;
+			label = "SW2-4";
+			wakeup-source;
+			debounce-interval = <20>;
+			gpios = <&gpio3 12 GPIO_ACTIVE_LOW>;
+		};
+	};
+
 	vga-encoder {
 		compatible = "adi,adv7123";
 
@@ -319,6 +356,11 @@ usb1_pins: usb1 {
 		groups = "usb1";
 		function = "usb1";
 	};
+
+	keyboard_pins: keyboard {
+		pins = "GP_3_9", "GP_3_10", "GP_3_11", "GP_3_12";
+		bias-pull-up;
+	};
 };
 
 &cmt0 {