MDIO_CTRL_TX_OP_S
#define MDIO_CTRL_TX_OP_M (0x3 << MDIO_CTRL_TX_OP_S)
#define MDIO_CTRL_TX_OP_READ (0x2 << MDIO_CTRL_TX_OP_S)
#define MDIO_CTRL_TX_OP_WRITE (0x1 << MDIO_CTRL_TX_OP_S)