qmk_firmware/keyboards/smithrune/iron165r2/f072/info.json

{
    "backlight": {
        "pin": "A6",
        "levels": 20,
        "breathing": true
    },
    "rgblight": {
        "led_count": 22
    },
    "ws2812": {
        "pin": "B15"
    },
    "processor": "STM32F072",
    "bootloader": "stm32-dfu"
}