PLL_CFG2_PREDIV
prediv = val & PLL_CFG2_PREDIV;
PHY_WRITE(sc, PLL_CFG2, (inittab->pll_cfg2 & ~PLL_CFG2_PREDIV) | prediv);
for (prediv = 0; prediv <= __SHIFTOUT_MASK(PLL_CFG2_PREDIV); prediv++) {
PHY_SET_CLEAR(sc, PLL_CFG2, __SHIFTIN(best_prediv, PLL_CFG2_PREDIV), PLL_CFG2_PREDIV);