iio: imu: st_lsm6dsx: add hw timestamp support
Introduce hw timestamp support instead of compute sample timestamps according to interrupt rate and configured watermark. LSM6DSx based devices are able to queue in hw FIFO the time reference of data sampling Signed-off-by: NLorenzo Bianconi <lorenzo.bianconi@redhat.com> Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>
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