measure_clock
int (*measure_clock)(struct adf_accel_dev *accel_dev);
ret = measure_clock(accel_dev, &freq);
if (hw_data->measure_clock)
hw_data->measure_clock(accel_dev);
hw_data->measure_clock = measure_clock;
hw_data->measure_clock = measure_clock;
hw_data->measure_clock = measure_clock;
hw_data->measure_clock = measure_clock;
hw_data->measure_clock = measure_clock;