INV_MPU6050_INTERNAL_FREQ_HZ
timestamp.clock_period = NSEC_PER_SEC / INV_MPU6050_INTERNAL_FREQ_HZ;
return div_u64(value * INV_MPU6050_INTERNAL_FREQ_HZ, freq_div);
value = div_u64(roc * freq_div, convert * INV_MPU6050_INTERNAL_FREQ_HZ);
((INV_MPU6050_INTERNAL_FREQ_HZ / (fifo_rate)) - 1)
(INV_MPU6050_INTERNAL_FREQ_HZ / ((divider) + 1))