phy_dump
void phy_dump(void *);
phydata->phy_dump = dump_NS83840;
phydata->phy_dump = dump_ICS1890;
phydata->phy_dump = NULL;
if (phydat->phy_dump)
phydat->phy_dump((struct mii_info *)mac, phy);
phy_genfunc phy_dump; /* how to dump registers this make */