PHYCLKRST_FSEL_UTMI
reg &= ~PHYCLKRST_FSEL_UTMI;
reg |= FIELD_PREP(PHYCLKRST_FSEL_UTMI, phy_drd->extrefclk);
reg &= ~(PHYCLKRST_FSEL_UTMI |
reg |= FIELD_PREP(PHYCLKRST_FSEL_UTMI, phy_drd->extrefclk);