[libcamera-devel] [PATCH v4 4/5] libcamera: properties: Provide a Devices camera property

[Kieran Bingham]

Provide a new Camera property that allows pipeline handlers to list any
kernel device used to operate the camera. This allows other frameworks
and daemons such as PipeWire to better understand the resources consumed
by a Camera and consider ignoring those resources when enumerating
camera devices on a system.

Tested-by: Ashok Sidipotu <ashok.sidipotu at collabora.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi at ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham at ideasonboard.com>

---
v4:
 - Report that different cameras may report identical devices
 - Rename to SystemDevices

Signed-off-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
---
 src/libcamera/property_ids.yaml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/libcamera/property_ids.yaml b/src/libcamera/property_ids.yaml
index cb55e0ed2283..ef1dfd322db1 100644
--- a/src/libcamera/property_ids.yaml
+++ b/src/libcamera/property_ids.yaml
@@ -690,6 +690,15 @@ controls:
         that is twice that of the full resolution mode. This value will be valid
         after the configure method has returned successfully.
 
+  - SystemDevices:
+      type: int64_t
+      size: [n]
+      description: |
+        A list of integer values of type dev_t denoting major and minor device
+        number of the underlying devices used in the operation of this camera.
+
+        Different cameras may report identical devices.
+
   # ----------------------------------------------------------------------------
   # Draft properties section
 
-- 
2.34.1