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Although the driver allows frequencies between 4 and 1000 Hz, only the frequencies advertised in the available frequencies file are backed properly by a low-pass filter to prevent aliasing, so it's best to use them. Since this is not obvious to the user, add a comment explaining what's going on. Signed-off-by: Martin Kelly <mkelly@xevo.com> Acked-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>