ARM: dts: rza2mevb: Add input switch

Add support for input switch SW3 on the Renesas RZ/A2M EVB
development board.

Note that this uses the IRQ interrupt, as the RZ/A2 GPIO controller
does not include interrupt support

Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r7s9210-rza2mevb.dts

@@ -9,6 +9,7 @@
 /dts-v1/;
 #include "r7s9210.dtsi"
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/pinctrl/r7s9210-pinctrl.h>
 
 / {
@@ -26,6 +27,21 @@
 		stdout-path = "serial0:115200n8";
 	};
 
+	keyboard {
+		compatible = "gpio-keys";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&keyboard_pins>;
+
+		key-3 {
+			interrupt-parent = <&irqc>;
+			interrupts = <0 IRQ_TYPE_EDGE_BOTH>;
+			linux,code = <KEY_3>;
+			label = "SW3";
+			wakeup-source;
+		};
+	};
+
 	lbsc {
 		#address-cells = <1>;
 		#size-cells = <1>;
@@ -121,6 +137,10 @@
 			 <RZA2_PINMUX(PORTL, 1, 5)>; /* IRQ5 */
 	};
 
+	keyboard_pins: keyboard {
+		pinmux = <RZA2_PINMUX(PORTJ, 1, 6)>;	/* IRQ0 */
+	};
+
 	/* Serial Console */
 	scif4_pins: serial4 {
 		pinmux = <RZA2_PINMUX(PORT9, 0, 4)>,	/* TxD4 */