Add ut22

config/boards/shields/ut22/Kconfig.defconfig

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+# SPDX-License-Identifier: MIT
+
+if SHIELD_UT22
+
+config ZMK_KEYBOARD_NAME
+    default "ut22"
+
+endif

config/boards/shields/ut22/Kconfig.shield

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+config SHIELD_UT22
+    def_bool $(shields_list_contains,ut22)

config/boards/shields/ut22/ut22.keymap

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+/*
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "../../../ut22.keymap"

config/boards/shields/ut22/ut22.overlay

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+#include <dt-bindings/zmk/matrix_transform.h>
+
+/ {
+    chosen {
+        zmk,kscan = &default_kscan;
+        zmk,matrix_transform = &default_transform;
+    };
+
+    default_kscan: kscan {
+        compatible = "zmk,kscan-gpio-matrix";
+        label = "default_kscan";
+        diode-direction = "col2row";
+        col-gpios
+            = <&pro_micro 15 GPIO_ACTIVE_HIGH> // COL0
+            , <&pro_micro 14 GPIO_ACTIVE_HIGH> // COL1
+            , <&pro_micro 16 GPIO_ACTIVE_HIGH> // COL2
+            , <&pro_micro 10 GPIO_ACTIVE_HIGH> // COL3
+        ;
+        row-gpios
+            = <&pro_micro 4 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)> // ROW0
+            , <&pro_micro 5 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)> // ROW1
+            , <&pro_micro 6 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)> // ROW2
+            , <&pro_micro 7 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)> // ROW3
+            , <&pro_micro 8 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)> // ROW4
+            , <&pro_micro 9 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)> // ROW5
+        ;
+
+    };
+
+    default_transform: matrix_transform {
+        compatible = "zmk,matrix-transform";
+        columns = <4>;
+        rows = <6>;
+
+        map = <
+            RC(0,0) RC(0,1) RC(0,2) RC(0,3) RC(3,3) RC(3,2) RC(3,1) RC(3,0)
+            RC(1,0) RC(1,1) RC(1,2) RC(1,3) RC(4,3) RC(4,2) RC(4,1) RC(4,0)
+            RC(2,0)         RC(2,2) RC(2,3) RC(5,3) RC(5,2)         RC(5,0)
+
+        >;
+    };
+};

config/ut22.conf

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+# --- TAIPO SETTINGS ---
+
+# the number of combos that can be active at the same time. Default 4.
+CONFIG_ZMK_COMBO_MAX_PRESSED_COMBOS=8
+
+# the maximum number of combos that can be active on a key position. Defaults to 5.
+# (So you can have 5 separate combos that use position 3 for example)
+CONFIG_ZMK_COMBO_MAX_COMBOS_PER_KEY=16
+
+# the maximum number of keys that need to be pressed to activate a combo. Default 4. 
+# If you want a combo that triggers when pressing 5 keys, you'd set this to 5 for example.
+CONFIG_ZMK_COMBO_MAX_KEYS_PER_COMBO=8