[PATCH v10 14/16] v4l: introduce the fences capability

[Ezequiel Garcia]

From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxx>

Drivers capable of using fences (vb2 drivers) should report the
V4L2_CAP_FENCES to userspace, so add this flag to the uapi.

v2: minor doc/english fix (Hans Verkuil)

Signed-off-by: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxx>
---
 Documentation/media/uapi/v4l/vidioc-querycap.rst | 3 +++
 include/uapi/linux/videodev2.h                   | 1 +
 2 files changed, 4 insertions(+)

diff --git a/Documentation/media/uapi/v4l/vidioc-querycap.rst b/Documentation/media/uapi/v4l/vidioc-querycap.rst
index 66fb1b3d6e6e..df3ad57f07a3 100644
--- a/Documentation/media/uapi/v4l/vidioc-querycap.rst
+++ b/Documentation/media/uapi/v4l/vidioc-querycap.rst
@@ -254,6 +254,9 @@ specification the ioctl returns an ``EINVAL`` error code.
     * - ``V4L2_CAP_TOUCH``
       - 0x10000000
       - This is a touch device.
+    * - ``V4L2_CAP_FENCES``
+      - 0x20000000
+      - The device supports explicit synchronization.
     * - ``V4L2_CAP_DEVICE_CAPS``
       - 0x80000000
       - The driver fills the ``device_caps`` field. This capability can
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 1f18dc68ecab..cab35fca7c7f 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -460,6 +460,7 @@ struct v4l2_capability {
 #define V4L2_CAP_STREAMING              0x04000000  /* streaming I/O ioctls */
 
 #define V4L2_CAP_TOUCH                  0x10000000  /* Is a touch device */
+#define V4L2_CAP_FENCES                 0x20000000  /* Supports explicit synchronization */
 
 #define V4L2_CAP_DEVICE_CAPS            0x80000000  /* sets device capabilities field */
 
-- 
2.16.3