adding default_transform to dongle overlay

Author: Linusoderlind

config/boards/shields/totem/totem_dongle.overlay

@@ -11,4 +11,41 @@
         rows = <0>;
         events = <0>;
     };
+};
+
+/ {
+    chosen {
+        zmk,kscan = &kscan0;
+        zmk,matrix_transform = &default_transform;
+    };
+
+    default_transform: keymap_transform_0 {
+        compatible = "zmk,matrix-transform";
+        columns = <10>;
+        rows = <4>;
+//             | SW01  | SW02  | SW03  | SW04  | SW05  |  | SW05  | SW04  | SW03  | SW02  | SW01  |
+//             | SW06  | SW07  | SW08  | SW09  | SW10  |  | SW10  | SW09  | SW08  | SW07  | SW06  | 
+//      | SW16 | SW11  | SW12  | SW13  | SW14  | SW15  |  | SW15  | SW14  | SW13  | SW12  | SW11  | SW16  |
+//                             | SW17  | SW18  | SW19  |  | SW19  | SW18  | SW17  | 
+        map = <
+                RC(0,0) RC(0,1) RC(0,2) RC(0,3) RC(0,4)    RC(0,5) RC(0,6) RC(0,7) RC(0,8) RC(0,9)
+                RC(1,0) RC(1,1) RC(1,2) RC(1,3) RC(1,4)    RC(1,5) RC(1,6) RC(1,7) RC(1,8) RC(1,9)
+        RC(3,0) RC(2,0) RC(2,1) RC(2,2) RC(2,3) RC(2,4)    RC(2,5) RC(2,6) RC(2,7) RC(2,8) RC(2,9) RC(3,9)
+                                RC(3,2) RC(3,3) RC(3,4)    RC(3,5) RC(3,6) RC(3,7)         
+        >;
+    };
+
+
+    kscan0: kscan_0 {
+        compatible = "zmk,kscan-gpio-matrix";
+        label = "KSCAN";
+        
+        diode-direction = "col2row"; 
+        row-gpios
+            = <&xiao_d 0 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+            , <&xiao_d 1 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+            , <&xiao_d 2 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+            , <&xiao_d 3 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+            ;
+    };
 };