boards: others: neorv32: add GPIO buttons

Add buttons connected via GPIOs 0 to 3 for the NEORV32 MinimalBoot and
UP5Kdemo board variants.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

Author: henrikbrixandersen

boards/others/neorv32/neorv32_neorv32_minimalboot.dts

@@ -8,6 +8,7 @@
 
 #include <neorv32.dtsi>
 #include <mem.h>
+#include <zephyr/dt-bindings/input/input-event-codes.h>
 
 / {
 	model = "NEORV32 MinimalBoot";
@@ -21,6 +22,10 @@
 		pwm-led0 = &pwm_led0;
 		pwm-led1 = &pwm_led1;
 		pwm-led2 = &pwm_led2;
+		sw0 = &btn0;
+		sw1 = &btn1;
+		sw3 = &btn2;
+		sw4 = &btn3;
 	};
 
 	chosen {
@@ -55,6 +60,34 @@
 		};
 	};
 
+	gpio_keys {
+		compatible = "gpio-keys";
+
+		btn0: btn0 {
+			label = "BTN0";
+			gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+
+		btn1: btn1 {
+			label = "BTN1";
+			gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+			zephyr,code = <INPUT_KEY_1>;
+		};
+
+		btn2: btn2 {
+			label = "BTN2";
+			gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+			zephyr,code = <INPUT_KEY_2>;
+		};
+
+		btn3: btn3 {
+			label = "BTN3";
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+			zephyr,code = <INPUT_KEY_3>;
+		};
+	};
+
 	pwmleds {
 		compatible = "pwm-leds";
 

boards/others/neorv32/neorv32_neorv32_up5kdemo.dts

@@ -8,6 +8,7 @@
 
 #include <neorv32.dtsi>
 #include <mem.h>
+#include <zephyr/dt-bindings/input/input-event-codes.h>
 
 / {
 	model = "NEORV32 UP5KDemo";
@@ -21,6 +22,10 @@
 		pwm-led0 = &pwm_led0;
 		pwm-led1 = &pwm_led1;
 		pwm-led2 = &pwm_led2;
+		sw0 = &btn0;
+		sw1 = &btn1;
+		sw3 = &btn2;
+		sw4 = &btn3;
 	};
 
 	chosen {
@@ -55,6 +60,34 @@
 		};
 	};
 
+	gpio_keys {
+		compatible = "gpio-keys";
+
+		btn0: btn0 {
+			label = "BTN0";
+			gpios = <&gpio 0 GPIO_ACTIVE_LOW>;
+			zephyr,code = <INPUT_KEY_0>;
+		};
+
+		btn1: btn1 {
+			label = "BTN1";
+			gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+			zephyr,code = <INPUT_KEY_1>;
+		};
+
+		btn2: btn2 {
+			label = "BTN2";
+			gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+			zephyr,code = <INPUT_KEY_2>;
+		};
+
+		btn3: btn3 {
+			label = "BTN3";
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+			zephyr,code = <INPUT_KEY_3>;
+		};
+	};
+
 	pwmleds {
 		compatible = "pwm-leds";