A2W_PLL_FRAC_BITS
# define A2W_PLL_FRAC_MASK ((1 << A2W_PLL_FRAC_BITS) - 1)
div = (u64)rate << A2W_PLL_FRAC_BITS;
*ndiv = div >> A2W_PLL_FRAC_BITS;
*fdiv = div & ((1 << A2W_PLL_FRAC_BITS) - 1);
rate = (u64)parent_rate * ((ndiv << A2W_PLL_FRAC_BITS) + fdiv);
return rate >> A2W_PLL_FRAC_BITS;