TX_SC_FLT_MAC_CFG
nxp_c45_macsec_read(phydev, TX_SC_FLT_MAC_CFG(tx_flt_base), ®);
nxp_c45_macsec_write(phydev, TX_SC_FLT_MAC_CFG(tx_flt_base), reg);
nxp_c45_macsec_read(phydev, TX_SC_FLT_MAC_CFG(tx_flt_base), ®);
nxp_c45_macsec_write(phydev, TX_SC_FLT_MAC_CFG(tx_flt_base), reg);