boards: renesas ra: Make ek_ra4m3 manually testable using push buttons

Add port IRQ's, `gpio-keys` for board push buttons and proper aliases in
order to make GPIO IRQs manually testable (eg. using sample/basic/buttons)

Only ioport0 port IRQs are provided for now, as those connected to board
physical buttons.

Signed-off-by: Piotr Rak <[email protected]>

Author: piotrrak

boards/renesas/ek_ra4m3/ek_ra4m3.dts

@@ -7,16 +7,18 @@
 /dts-v1/;
 
 #include <zephyr/dt-bindings/gpio/gpio.h>
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
 #include "ek_ra4m3_common.dtsi"
 
 / {
-	model = "Renesas ek-ra4m3 board";
+	model = "Renesas EK-RA4M3 board";
 
 	chosen {
 		zephyr,sram = &sram0;
-                zephyr,flash = &flash0;
-                zephyr,code-partition = &code_partition;
-        };
+		zephyr,flash = &flash0;
+		zephyr,code-partition = &code_partition;
+	};
 
 	leds {
 		compatible = "gpio-leds";
@@ -32,14 +34,32 @@
 			gpios = <&ioport4 0 GPIO_ACTIVE_HIGH>;
 			label = "LED3 (Red)";
 		};
-        };
+	};
+
+	buttons {
+		compatible = "gpio-keys";
+
+		button0: button_0 {
+			gpios = <&ioport0 5 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "Push button switch 0";
+			zephyr,code = <INPUT_KEY_0>;
+		};
+		button1: button_1 {
+			gpios = <&ioport0 6 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "Push button switch 1";
+			zephyr,code = <INPUT_KEY_1>;
+		};
+	};
 
 	aliases {
 		led0 = &led_0;
+		led1 = &led_1;
 		led-blue = &led_0;
 		led-green = &led_1;
 		led-red = &led_2;
-        };
+		sw0 = &button0;
+		sw1 = &button1;
+	};
 };
 
 &flash0 {
@@ -52,14 +72,18 @@
 			label = "code";
 			reg = <0x00000000 0x4C000>;
 			read-only;
-                };
-        };
+		};
+	};
 };
 
 &fcu {
 	status = "okay";
 };
 
+&ioport0 {
+	status = "okay";
+};
+
 &ioport4 {
 	status = "okay";
 };

dts/arm/renesas/ra/ra4m-cm33-common.dtsi

@@ -34,6 +34,28 @@
 			compatible = "renesas,ra-gpio";
 			reg = <0x40080000 0x20>;
 
+			interrupts = <RA_ICU_IRQ_UNSPECIFIED 0 RA_ICU_PORT_IRQ6>,
+				     <RA_ICU_IRQ_UNSPECIFIED 0 RA_ICU_PORT_IRQ7>,
+				     <RA_ICU_IRQ_UNSPECIFIED 0 RA_ICU_PORT_IRQ8>,
+				     <RA_ICU_IRQ_UNSPECIFIED 0 RA_ICU_PORT_IRQ9>,
+				     <RA_ICU_IRQ_UNSPECIFIED 0 RA_ICU_PORT_IRQ10>,
+				     <RA_ICU_IRQ_UNSPECIFIED 0 RA_ICU_PORT_IRQ11>,
+				     <RA_ICU_IRQ_UNSPECIFIED 0 RA_ICU_PORT_IRQ12>,
+				     <RA_ICU_IRQ_UNSPECIFIED 0 RA_ICU_PORT_IRQ13>;
+
+			interrupt-names = "port-irq6", "port-irq7", "port-irq8",
+					  "port-irq9", "port-irq10", "port-irq11",
+					  "port-irq12" , "port-irq13";
+
+			port-irq6-pins = <0>;
+			port-irq7-pins = <1>;
+			port-irq8-pins = <2>;
+			port-irq9-pins = <4>;
+			port-irq10-pins = <5>;
+			port-irq11-pins = <6>;
+			port-irq12-pins = <8>;
+			port-irq13-pins = <9>;
+
 			gpio-controller;
 			#gpio-cells = <2>;
 			ngpios = <16>;