MDTOPHY
KASSERT((sc->sc_mdiobits & MDTOPHY) == 0);
if ((sc->sc_mdiobits ^ bits) & MDTOPHY) {
int flags = (bits & MDTOPHY) ? GPIO_PIN_OUTPUT : GPIO_PIN_INPUT;
.mbo_bits[MII_BIT_DIR_HOST_PHY] = MDTOPHY,