PLL_DIVR1_MASK
divr1 = FIELD_GET(PLL_DIVR1_MASK, val);
val &= ~(PLL_DIVR1_MASK | PLL_DIVR2_MASK | PLL_DIVQ_MASK);
val |= FIELD_PREP(PLL_DIVR1_MASK, setup->divr1);