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    Subject[PATCH v8 11/13] [media] v4l: introduce the fences capability
    Date
    From: Gustavo Padovan <gustavo.padovan@collabora.com>

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

    Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
    ---
    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..414016065309 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 support 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 2d424aebdd1e..db58204e346e 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 */

    --
    2.14.3
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