radio_attach_mi
radio_attach_mi(&bktr_hw_if, bktr, &bktr->bktr_dev);
radio_attach_mi(&fmsradio_hw_if, sc, &sc->sc_dev);
struct device *radio_attach_mi(const struct radio_hw_if *, void *,
sc->sc_child = radio_attach_mi(&udsbr_hw_if, sc, &sc->sc_dev);