wm_gmii_i82544_writereg_locked
sc->phy.writereg_locked = wm_gmii_i82544_writereg_locked;
rv = wm_gmii_i82544_writereg_locked(dev, phy, reg & MII_ADDRMASK, val);
static int wm_gmii_i82544_writereg_locked(device_t, int, int, uint16_t);