PLL_DIVR2_MASK
divr2 = FIELD_GET(PLL_DIVR2_MASK, val);
val &= ~(PLL_DIVR1_MASK | PLL_DIVR2_MASK | PLL_DIVQ_MASK);
val |= FIELD_PREP(PLL_DIVR2_MASK, setup->divr2);