arm64: dts: renesas: rzg3s-smarc: Add gpio keys

RZ SMARC Carrier II board has 3 user buttons called USER_SW1, USER_SW2,
USER_SW3. Add a DT node in device tree to propertly instantiate the
gpio-keys driver for these buttons.
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20231227130810.2744550-1-claudiu.beznea.uj@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/rzg3s-smarc.dtsi

@@ -6,6 +6,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/pinctrl/rzg2l-pinctrl.h>
 
 / {
@@ -14,6 +15,37 @@ aliases {
 		mmc1 = &sdhi1;
 	};
 
+	keys {
+		compatible = "gpio-keys";
+
+		key-1 {
+			interrupts = <RZG2L_GPIO(18, 0) IRQ_TYPE_EDGE_FALLING>;
+			interrupt-parent = <&pinctrl>;
+			linux,code = <KEY_1>;
+			label = "USER_SW1";
+			wakeup-source;
+			debounce-interval = <20>;
+		};
+
+		key-2 {
+			interrupts = <RZG2L_GPIO(0, 1) IRQ_TYPE_EDGE_FALLING>;
+			interrupt-parent = <&pinctrl>;
+			linux,code = <KEY_2>;
+			label = "USER_SW2";
+			wakeup-source;
+			debounce-interval = <20>;
+		};
+
+		key-3 {
+			interrupts = <RZG2L_GPIO(0, 3) IRQ_TYPE_EDGE_FALLING>;
+			interrupt-parent = <&pinctrl>;
+			linux,code = <KEY_3>;
+			label = "USER_SW3";
+			wakeup-source;
+			debounce-interval = <20>;
+		};
+	};
+
 	vcc_sdhi1: regulator-vcc-sdhi1 {
 		compatible = "regulator-fixed";
 		regulator-name = "SDHI1 Vcc";
@@ -35,6 +67,27 @@ vccq_sdhi1: regulator-vccq-sdhi1 {
 };
 
 &pinctrl {
+	key-1-gpio-hog {
+		gpio-hog;
+		gpios = <RZG2L_GPIO(18, 0) GPIO_ACTIVE_LOW>;
+		input;
+		line-name = "key-1-gpio-irq";
+	};
+
+	key-2-gpio-hog {
+		gpio-hog;
+		gpios = <RZG2L_GPIO(0, 1) GPIO_ACTIVE_LOW>;
+		input;
+		line-name = "key-2-gpio-irq";
+	};
+
+	key-3-gpio-hog {
+		gpio-hog;
+		gpios = <RZG2L_GPIO(0, 3) GPIO_ACTIVE_LOW>;
+		input;
+		line-name = "key-3-gpio-irq";
+	};
+
 	scif0_pins: scif0 {
 		pinmux = <RZG2L_PORT_PINMUX(6, 3, 1)>, /* RXD */
 			 <RZG2L_PORT_PINMUX(6, 4, 1)>; /* TXD */