PLL_CFG2
PHY_READ(sc, PLL_CFG1), PHY_READ(sc, PLL_CFG2), PHY_READ(sc, PLL_CFG3));
val = PHY_READ(sc, PLL_CFG2);
PHY_WRITE(sc, PLL_CFG2, (inittab->pll_cfg2 & ~PLL_CFG2_PREDIV) | prediv);
PHY_SET_CLEAR(sc, PLL_CFG2, __SHIFTIN(best_prediv, PLL_CFG2_PREDIV), PLL_CFG2_PREDIV);