[RFC 05/11] v4l: subdev: add V4L2_SUBDEV_ROUTE_FL_SOURCE

[Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>]

Add route flag to indicate that the route is a source route. This means
that the route does not lead anywhere, and the sink_pad and sink_stream
should not be used.

A sensor which provides multiple streams should implement get_routing
and use the flag to mark the routes as sources.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 include/uapi/linux/v4l2-subdev.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/uapi/linux/v4l2-subdev.h b/include/uapi/linux/v4l2-subdev.h
index 45c01799e2cd..f20491e1f53f 100644
--- a/include/uapi/linux/v4l2-subdev.h
+++ b/include/uapi/linux/v4l2-subdev.h
@@ -200,6 +200,13 @@ struct v4l2_subdev_capability {
  */
 #define V4L2_SUBDEV_ROUTE_FL_IMMUTABLE		BIT(1)
 
+/**
+ * Is the route a source endpoint? A source endpoint route doesn't come
+ * from "anywhere", and the sink_pad and sink_stream fields are unused.
+ * Set by the driver.
+ */
+#define V4L2_SUBDEV_ROUTE_FL_SOURCE		BIT(2)
+
 /**
  * struct v4l2_subdev_route - A route inside a subdev
  *
-- 
2.25.1