PLL_FREF_MAX_FREQ
if (parent_rate < PLL_FREF_MIN_FREQ || parent_rate > PLL_FREF_MAX_FREQ)
if (parent_rate < PLL_FREF_MIN_FREQ || parent_rate > PLL_FREF_MAX_FREQ)
if (req->best_parent_rate < PLL_FREF_MIN_FREQ || req->best_parent_rate > PLL_FREF_MAX_FREQ)