MAC_EXT_PHY0_ADDR
reg &= ~(MAC_EXT_PHY1_ADDR | MAC_EXT_PHY0_ADDR);
reg |= FIELD_PREP(MAC_EXT_PHY1_ADDR, 31) | FIELD_PREP(MAC_EXT_PHY0_ADDR, 31);
reg &= ~MAC_EXT_PHY0_ADDR;
reg |= FIELD_PREP(MAC_EXT_PHY0_ADDR, addr);
reg &= ~MAC_EXT_PHY0_ADDR;
reg |= FIELD_PREP(MAC_EXT_PHY0_ADDR, 31);