int (*mdio_read) (struct net_device *dev, int mii_id, int reg);
void (*mdio_write) (struct net_device *dev, int mii_id, int reg, int val);
int (*mdio_read) (struct net_device *dev, int mii_id, int reg);
void (*mdio_write) (struct net_device *dev, int mii_id, int reg, int val);