Tweak to use a chosen node for kscan device.

boards/shields/petejohanson_handwire/petejohanson_handwire.overlay

@@ -3,6 +3,7 @@
 / {
 	chosen {
 		zmk,keymap = &keymap0;
+		zmk,kscan = &kscan0;
 	};
 
 	layers {
@@ -10,7 +11,11 @@
 
 		default: layer_0 {
 			label = "Default";
-			keys = <KC_A KC_B KC_C KC_D>;
+			keys =
+	<
+	KC_A KC_B
+	KC_C KC_D
+	>;
 		};
 
 		lower: layer_1 {
@@ -31,9 +36,9 @@
 		layers = <&default &lower &raise>;
 	};
 
-	kscan {
+	kscan0: kscan {
 		compatible = "gpio-kscan";
-		label = "Handwired GPIO KSCAN matrix";
+		label = "KSCAN";
 
 		diode-direction = "row2col";
 		row-gpios = <&arduino_header 8 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,

src/main.c

@@ -8,14 +8,16 @@
 #include <device.h>
 #include <devicetree.h>
 
+#include "zmk.h"
 #include "kscan.h"
 #include "usb_hid.h"
 
+#define ZMK_KSCAN_DEV DT_LABEL(ZMK_MATRIX_NODE_ID)
 void main(void)
 {
 	printk("Welcome to ZMK!\n");
 
-	if (zmk_kscan_init(CONFIG_KSCAN_MATRIX_DEV_NAME) != 0) {
+	if (zmk_kscan_init(ZMK_KSCAN_DEV) != 0) {
 		printk("Keyboard Scan Init Failed\n");
 		return;
 	}

src/zmk.h

@@ -1,8 +1,8 @@
 #ifndef ZMK_H
 #define ZMK_H
 
-#define __ZMK_MATRIX_NODE_ID DT_PATH(kscan)
-#define ZMK_MATRIX_ROWS DT_PROP_LEN(__ZMK_MATRIX_NODE_ID,row_gpios)
-#define ZMK_MATRIX_COLS DT_PROP_LEN(__ZMK_MATRIX_NODE_ID,col_gpios)
+#define ZMK_MATRIX_NODE_ID DT_CHOSEN(zmk_kscan)
+#define ZMK_MATRIX_ROWS DT_PROP_LEN(ZMK_MATRIX_NODE_ID,row_gpios)
+#define ZMK_MATRIX_COLS DT_PROP_LEN(ZMK_MATRIX_NODE_ID,col_gpios)
 
 #endif