PLL_MFN_MASK
mfn = FIELD_GET(PLL_MFN_MASK, pll_numerator);
writel_relaxed(FIELD_PREP(PLL_MFN_MASK, rate->mfn), pll->base + PLL_NUMERATOR);
ana_mfn = FIELD_GET(PLL_MFN_MASK, ana_mfn);