[PATCH v2.1 1/4] media: Add pad flag MEDIA_PAD_FL_MUST_CONNECT

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Pads that set this flag must be connected by an active link for the entity
to stream.

Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxx>
Acked-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
---
 Documentation/DocBook/media/v4l/media-ioc-enum-links.xml |   10 ++++++++++
 include/uapi/linux/media.h                               |    1 +
 2 files changed, 11 insertions(+)

diff --git a/Documentation/DocBook/media/v4l/media-ioc-enum-links.xml b/Documentation/DocBook/media/v4l/media-ioc-enum-links.xml
index 355df43..e357dc9 100644
--- a/Documentation/DocBook/media/v4l/media-ioc-enum-links.xml
+++ b/Documentation/DocBook/media/v4l/media-ioc-enum-links.xml
@@ -134,6 +134,16 @@
 	    <entry>Output pad, relative to the entity. Output pads source data
 	    and are origins of links.</entry>
 	  </row>
+	  <row>
+	    <entry><constant>MEDIA_PAD_FL_MUST_CONNECT</constant></entry>
+	    <entry>If this flag is set and the pad is linked to any other
+	    pad, then at least one of those links must be enabled for the
+	    entity to be able to stream. There could be temporary reasons
+	    (e.g. device configuration dependent) for the pad to need
+	    enabled links even when this flag isn't set; the absence of the
+	    flag doesn't imply there is none. The flag has no effect on pads
+	    without connected links.</entry>
+	  </row>
 	</tbody>
       </tgroup>
     </table>
diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
index ed49574..d847c76 100644
--- a/include/uapi/linux/media.h
+++ b/include/uapi/linux/media.h
@@ -98,6 +98,7 @@ struct media_entity_desc {
 
 #define MEDIA_PAD_FL_SINK		(1 << 0)
 #define MEDIA_PAD_FL_SOURCE		(1 << 1)
+#define MEDIA_PAD_FL_MUST_CONNECT	(1 << 2)
 
 struct media_pad_desc {
 	__u32 entity;		/* entity ID */
-- 
1.7.10.4

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