[media] dvbdev: create links on devices with multiple frontends

Devices like mxl111sf-based WinTV Aero-m have multiple
frontends, all linked on the same demod. Currently, the
dvb_create_graph() function is not smart enough to create
multiple links. Fix it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/media/dvb-core/dvbdev.h b/drivers/media/dvb-core/dvbdev.h
index b622d6a3b95e..d7c67baa885e 100644
--- a/drivers/media/dvb-core/dvbdev.h
+++ b/drivers/media/dvb-core/dvbdev.h
@@ -225,6 +225,13 @@ void dvb_unregister_device(struct dvb_device *dvbdev);
  *
  * @adap:			pointer to struct dvb_adapter
  * @create_rf_connector:	if true, it creates the RF connector too
+ *
+ * This function checks all DVB-related functions at the media controller
+ * entities and creates the needed links for the media graph. It is
+ * capable of working with multiple tuners or multiple frontends, but it
+ * won't create links if the device has multiple tuners and multiple frontends
+ * or if the device has multiple muxes. In such case, the caller driver should
+ * manually create the remaining links.
  */
 __must_check int dvb_create_media_graph(struct dvb_adapter *adap,
 					bool create_rf_connector);