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Added timestamp channel. With this change, each sample has a timestamp. This timestamp can be from the sensor hub when present or local kernel timestamp. HID sensors can send timestamp with input data using usage id HID_USAGE_SENSOR_TIME_TIMESTAMP. This timestamp value is converted to nano seconds before pushing this sample to the iio core. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>