ip17x_readphy
data = ip17x_readphy(sc->sc_dev, IP175C_MII_PHY, IP175C_MII_CTL_REG);
data = ip17x_readphy(sc->sc_dev, IP175C_MODE_PHY, IP175C_MODE_REG);
DEVMETHOD(miibus_readreg, ip17x_readphy),
DEVMETHOD(mdio_readreg, ip17x_readphy),
DEVMETHOD(etherswitch_readphyreg, ip17x_readphy),
val = ip17x_readphy(dev, phy, reg);
int ip17x_readphy(device_t, int, int);