diff --git a/Documentation/userspace-api/media/v4l/async.rst b/Documentation/userspace-api/media/v4l/async.rst
deleted file mode 100644
index d6960ff5c382..000000000000
--- a/Documentation/userspace-api/media/v4l/async.rst
+++ /dev/null
@@ -1,9 +0,0 @@
-.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
-
-.. _async:
-
-****************
-Asynchronous I/O
-****************
-
-This method is not defined yet.
diff --git a/Documentation/userspace-api/media/v4l/dev-raw-vbi.rst b/Documentation/userspace-api/media/v4l/dev-raw-vbi.rst
index 58f97c3a7792..2bec20d87928 100644
--- a/Documentation/userspace-api/media/v4l/dev-raw-vbi.rst
+++ b/Documentation/userspace-api/media/v4l/dev-raw-vbi.rst
@@ -41,7 +41,7 @@ Devices supporting the raw VBI capturing or output API set the
 in the ``capabilities`` field of struct
 :c:type:`v4l2_capability` returned by the
 :ref:`VIDIOC_QUERYCAP` ioctl. At least one of the
-read/write, streaming or asynchronous I/O methods must be supported. VBI
+read/write or streaming I/O methods must be supported. VBI
 devices may or may not have a tuner or modulator.
 
 Supplemental Functions
diff --git a/Documentation/userspace-api/media/v4l/dev-sdr.rst b/Documentation/userspace-api/media/v4l/dev-sdr.rst
index 928884dfe09d..dfdeddbca41f 100644
--- a/Documentation/userspace-api/media/v4l/dev-sdr.rst
+++ b/Documentation/userspace-api/media/v4l/dev-sdr.rst
@@ -34,7 +34,7 @@ Devices supporting the SDR transmitter interface set the
 device has an Digital to Analog Converter (DAC), which is a mandatory
 element for the SDR transmitter.
 
-At least one of the read/write, streaming or asynchronous I/O methods
+At least one of the read/write or streaming I/O methods
 must be supported.
 
 
diff --git a/Documentation/userspace-api/media/v4l/dev-sliced-vbi.rst b/Documentation/userspace-api/media/v4l/dev-sliced-vbi.rst
index 97ec2b115c71..44415822c7c5 100644
--- a/Documentation/userspace-api/media/v4l/dev-sliced-vbi.rst
+++ b/Documentation/userspace-api/media/v4l/dev-sliced-vbi.rst
@@ -36,7 +36,7 @@ Devices supporting the sliced VBI capturing or output API set the
 respectively, in the ``capabilities`` field of struct
 :c:type:`v4l2_capability` returned by the
 :ref:`VIDIOC_QUERYCAP` ioctl. At least one of the
-read/write, streaming or asynchronous :ref:`I/O methods <io>` must be
+read/write or streaming :ref:`I/O methods <io>` must be
 supported. Sliced VBI devices may have a tuner or modulator.
 
 Supplemental Functions
diff --git a/Documentation/userspace-api/media/v4l/hist-v4l2.rst b/Documentation/userspace-api/media/v4l/hist-v4l2.rst
index 28a2750d5c8c..dbc04374dc22 100644
--- a/Documentation/userspace-api/media/v4l/hist-v4l2.rst
+++ b/Documentation/userspace-api/media/v4l/hist-v4l2.rst
@@ -316,7 +316,7 @@ This unnamed version was finally merged into Linux 2.5.46.
     There are new fields to identify the driver, a new RDS device
     function ``V4L2_CAP_RDS_CAPTURE``, the ``V4L2_CAP_AUDIO`` flag
     indicates if the device has any audio connectors, another I/O
-    capability ``V4L2_CAP_ASYNCIO`` can be flagged. In response to these
+    capability V4L2_CAP_ASYNCIO can be flagged. In response to these
     changes the ``type`` field became a bit set and was merged into the
     ``flags`` field. ``V4L2_FLAG_TUNER`` was renamed to
     ``V4L2_CAP_TUNER``, ``V4L2_CAP_VIDEO_OVERLAY`` replaced
diff --git a/Documentation/userspace-api/media/v4l/io.rst b/Documentation/userspace-api/media/v4l/io.rst
index ce0cece6f35f..4b1964df9d73 100644
--- a/Documentation/userspace-api/media/v4l/io.rst
+++ b/Documentation/userspace-api/media/v4l/io.rst
@@ -17,8 +17,7 @@ read or write will fail at any time.
 
 Other methods must be negotiated. To select the streaming I/O method
 with memory mapped or user buffers applications call the
-:ref:`VIDIOC_REQBUFS` ioctl. The asynchronous I/O
-method is not defined yet.
+:ref:`VIDIOC_REQBUFS` ioctl.
 
 Video overlay can be considered another I/O method, although the
 application does not directly receive the image data. It is selected by
@@ -46,6 +45,5 @@ The following sections describe the various I/O methods in more detail.
     mmap
     userp
     dmabuf
-    async
     buffer
     field-order
diff --git a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
index 63e23f6f95ee..6c57b8428356 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
@@ -244,9 +244,6 @@ specification the ioctl returns an ``EINVAL`` error code.
       - 0x01000000
       - The device supports the :c:func:`read()` and/or
 	:c:func:`write()` I/O methods.
-    * - ``V4L2_CAP_ASYNCIO``
-      - 0x02000000
-      - The device supports the :ref:`asynchronous <async>` I/O methods.
     * - ``V4L2_CAP_STREAMING``
       - 0x04000000
       - The device supports the :ref:`streaming <mmap>` I/O method.
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 01e630f2ec78..1af12e5928aa 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -502,7 +502,6 @@ struct v4l2_capability {
 #define V4L2_CAP_META_CAPTURE		0x00800000  /* Is a metadata capture device */
 
 #define V4L2_CAP_READWRITE              0x01000000  /* read/write systemcalls */
-#define V4L2_CAP_ASYNCIO                0x02000000  /* async I/O */
 #define V4L2_CAP_STREAMING              0x04000000  /* streaming I/O ioctls */
 #define V4L2_CAP_META_OUTPUT		0x08000000  /* Is a metadata output device */
 
@@ -2682,6 +2681,7 @@ struct v4l2_create_buffers {
 #ifndef __KERNEL__
 #define V4L2_PIX_FMT_HM12 V4L2_PIX_FMT_NV12_16L16
 #define V4L2_PIX_FMT_SUNXI_TILED_NV12 V4L2_PIX_FMT_NV12_32L32
+#define V4L2_CAP_ASYNCIO 0
 #endif
 
 #endif /* _UAPI__LINUX_VIDEODEV2_H */
