meta-openembedded/meta-oe/recipes-support/libusbgx/libusbgx/usbgx.service

[Unit]
Description=Load USB gadget schemas
Requires=sys-kernel-config.mount
After=sys-kernel-config.mount

[Service]
Type=oneshot
ExecStart=/usr/bin/gadget-start

[Install]
WantedBy=usb-gadget.target