diff mbox series

[v3,2/5] media: docs: Add V4L2_CAP_EDID

Message ID 20220928112147.358745-3-hljunggr@cisco.com (mailing list archive)
State Superseded
Delegated to: Hans Verkuil
Headers
Series Add the cat24c208 EDID EEPROM driver + new EDID capability |

Commit Message

Erling Ljunggren Sept. 28, 2022, 11:21 a.m. UTC 
  Add documentation for the new edid capability.

Signed-off-by: Erling Ljunggren <hljunggr@cisco.com>
---
 Documentation/userspace-api/media/v4l/biblio.rst      | 11 +++++++++++
 .../userspace-api/media/v4l/vidioc-querycap.rst       | 11 +++++++++++
 .../userspace-api/media/videodev2.h.rst.exceptions    |  1 +
 3 files changed, 23 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/userspace-api/media/v4l/biblio.rst b/Documentation/userspace-api/media/v4l/biblio.rst
index 9cd18c153d19..5cbe41877a63 100644
--- a/Documentation/userspace-api/media/v4l/biblio.rst
+++ b/Documentation/userspace-api/media/v4l/biblio.rst
@@ -334,6 +334,17 @@  VESA DMT
 
 :author:    Video Electronics Standards Association (http://www.vesa.org)
 
+.. _vesaeddc:
+
+E-DDC
+====
+
+
+:title:     VESA Enhanced Display Data Channel (E-DDC) Standard
+:subtitle:  Version 1.3
+
+:author:    Video Electronics Standards Association (http://www.vesa.org)
+
 .. _vesaedid:
 
 EDID
diff --git a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
index 6c57b8428356..3d11d86d9cbf 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-querycap.rst
@@ -244,6 +244,17 @@  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_EDID``
+      - 0x02000000
+      - The device stores the EDID for a video input, or retrieves the EDID for a video
+        output. It is a standalone EDID device, so no video streaming etc. will take place.
+
+        For a video input this is typically an eeprom that supports the
+        :ref:`VESA Enhanced Display Data Channel Standard <vesaeddc>`. It can be something
+        else as well, for example a micro controller.
+
+        For a video output this is typically read from an external device such as an
+        HDMI splitter accessed by a serial port.
     * - ``V4L2_CAP_STREAMING``
       - 0x04000000
       - The device supports the :ref:`streaming <mmap>` I/O method.
diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
index 9cbb7a0c354a..b1b1127d278c 100644
--- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
+++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
@@ -185,6 +185,7 @@  replace define V4L2_CAP_META_OUTPUT device-capabilities
 replace define V4L2_CAP_DEVICE_CAPS device-capabilities
 replace define V4L2_CAP_TOUCH device-capabilities
 replace define V4L2_CAP_IO_MC device-capabilities
+replace define V4L2_CAP_EDID device-capabilities
 
 # V4L2 pix flags
 replace define V4L2_PIX_FMT_PRIV_MAGIC :c:type:`v4l2_pix_format`