ENETC4_PSIPMMR
val = enetc_port_rd(hw, ENETC4_PSIPMMR);
enetc_port_wr(hw, ENETC4_PSIPMMR, 0);
u32 val = enetc_port_rd(hw, ENETC4_PSIPMMR);
enetc_port_wr(hw, ENETC4_PSIPMMR, val);