PMU_BUSY_CYCLES_NORM_MAX
norm = PMU_BUSY_CYCLES_NORM_MAX;
norm = PMU_BUSY_CYCLES_NORM_MAX;
norm = (u32)div64_u64(busy_cycles * PMU_BUSY_CYCLES_NORM_MAX,
gdevfreq->busy_time = div_u64(gdevfreq->total_time * norm, PMU_BUSY_CYCLES_NORM_MAX);