[PATCH v12 19/86] media: v4l: Add V4L2_SUBDEV_ROUTE_FL_STATIC sub-device routing flag

[Sakari Ailus <sakari.ailus@linux.intel.com>]

Add a flag to denote static routes, V4L2_SUBDEV_ROUTE_FL_STATIC. Such
routes cannot be removed as they are related to hardware features.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 .../userspace-api/media/v4l/vidioc-subdev-g-routing.rst     | 6 +++++-
 include/uapi/linux/v4l2-subdev.h                            | 4 ++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst
index 2fd55d875075..e99c83d21165 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-subdev-g-routing.rst
@@ -150,7 +150,11 @@ wants to retrieve the missing routes, it can issue a new
       - 0x0002
       - The route is immutable. Set by the driver. Indicates that the
 	``V4L2_SUBDEV_ROUTE_FL_ACTIVE`` flag of an immutable route may not be
-	unset.
+	unset. Implies ``V4L2_SUBDEV_ROUTE_FL_STATIC``.
+    * - ``V4L2_SUBDEV_ROUTE_FL_STATIC``
+      - 0x0004
+      - The route is static. Set by the driver. Indicates that the route is
+        always present and cannot be removed.
 
 Return Value
 ============
diff --git a/include/uapi/linux/v4l2-subdev.h b/include/uapi/linux/v4l2-subdev.h
index 2be7db814288..477d3ce3ddb4 100644
--- a/include/uapi/linux/v4l2-subdev.h
+++ b/include/uapi/linux/v4l2-subdev.h
@@ -212,6 +212,10 @@ struct v4l2_subdev_capability {
  * unset.
  */
 #define V4L2_SUBDEV_ROUTE_FL_IMMUTABLE		(1U << 1)
+/*
+ * Is the route static? Routes with the STATIC flag are not removable.
+ */
+#define V4L2_SUBDEV_ROUTE_FL_STATIC		(1U << 2)
 
 /**
  * struct v4l2_subdev_route - A route inside a subdev
-- 
2.47.3