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 <sylvester.nawrocki@xxxxxxxxx>
---
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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