qmk-firmware/keyboards/25keys/zinc/reva/info.json

{
  "keyboard_name": "Zinc rev.A",
  "matrix_pins": {
    "cols": ["F4", "F5", "F6", "F7", "B1", "B3"],
    "rows": ["D4", "C6", "D7", "E6"]
  },
  "diode_direction": "COL2ROW",
  "split": {
    "soft_serial_pin": "D2"
  }
}