arm64: dts: renesas: r8a779a0: falcon-cpu: Add SW47-SW49 support

Add support for SW47, SW48 and SW49 via "gpio-keys" on the R-Car V3U
Falcon board.
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Link: https://lore.kernel.org/r/20210922201314.3205674-1-kieran.bingham@ideasonboard.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r8a779a0-falcon-cpu.dtsi

@@ -6,6 +6,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/leds/common.h>
 
 #include "r8a779a0.dtsi"
@@ -22,6 +23,37 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
+	keys {
+		compatible = "gpio-keys";
+
+		pinctrl-0 = <&keys_pins>;
+		pinctrl-names = "default";
+
+		key-1 {
+			gpios = <&gpio6 18 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_1>;
+			label = "SW47";
+			wakeup-source;
+			debounce-interval = <20>;
+		};
+
+		key-2 {
+			gpios = <&gpio6 19 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_2>;
+			label = "SW48";
+			wakeup-source;
+			debounce-interval = <20>;
+		};
+
+		key-3 {
+			gpios = <&gpio6 20 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_3>;
+			label = "SW49";
+			wakeup-source;
+			debounce-interval = <20>;
+		};
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -160,6 +192,11 @@ i2c6_pins: i2c6 {
 		function = "i2c6";
 	};
 
+	keys_pins: keys {
+		pins = "GP_6_18", "GP_6_19", "GP_6_20";
+		bias-pull-up;
+	};
+
 	mmc_pins: mmc {
 		groups = "mmc_data8", "mmc_ctrl", "mmc_ds";
 		function = "mmc";