media: vimc: stream: add missing function documentation

	return -EINVAL;

}

/*

 * vimc_streamer_thread - process frames through the pipeline

 *

 * @data:	vimc_stream struct of the current stream

 *

 * From the source to the sink, gets a frame from each subdevice and send to

 * the next one of the pipeline at a fixed framerate.

 */

static int vimc_streamer_thread(void *data)

{

	struct vimc_stream *stream = data;

	return 0;

}

/*

 * vimc_streamer_s_stream - start/stop the streaming on the media pipeline

 *

 * @stream:	the pointer to the stream structure of the current stream

 * @ved:	pointer to the vimc entity of the entity of the stream

 * @enable:	flag to determine if stream should start/stop

 *

 * When starting, check if there is no stream->kthread allocated. This should

 * indicate that a stream is already running. Then, it initializes

 * the pipeline, creates and runs a kthread to consume buffers through the

 * pipeline.

 * When stopping, analogously check if there is a stream running, stop

 * the thread and terminates the pipeline.

 */

int vimc_streamer_s_stream(struct vimc_stream *stream,

			   struct vimc_ent_device *ved,

			   int enable)