[media] DocBook: Mark CROPCAP as optional instead of as compulsory
While the documentation says that VIDIOC_CROPCAP is compulsory for
all video capture and output devices, in practice VIDIOC_CROPCAP is
only implemented for devices that can do cropping and/or scaling.
Update the documentation to no longer require VIDIOC_CROPCAP if the
driver does not support cropping or scaling or non-square pixels.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/Documentation/DocBook/media/v4l/vidioc-cropcap.xml b/Documentation/DocBook/media/v4l/vidioc-cropcap.xml
index 4559c45..bf7cc97 100644
--- a/Documentation/DocBook/media/v4l/vidioc-cropcap.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-cropcap.xml
@@ -59,6 +59,9 @@
switch can occur implicit when switching the video input or
output.</para>
+ <para>This ioctl must be implemented for video capture or output devices that
+support cropping and/or scaling and/or have non-square pixels, and for overlay devices.</para>
+
<table pgwide="1" frame="none" id="v4l2-cropcap">
<title>struct <structname>v4l2_cropcap</structname></title>
<tgroup cols="3">
@@ -70,7 +73,9 @@
<entry>Type of the data stream, set by the application.
Only these types are valid here:
<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant>,
-<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant> and
+<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE</constant>,
+<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant>,
+<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE</constant> and
<constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant>. See <xref linkend="v4l2-buf-type" />.</entry>
</row>
<row>
@@ -154,8 +159,7 @@
<term><errorcode>EINVAL</errorcode></term>
<listitem>
<para>The &v4l2-cropcap; <structfield>type</structfield> is
-invalid. This is not permitted for video capture, output and overlay devices,
-which must support <constant>VIDIOC_CROPCAP</constant>.</para>
+invalid.</para>
</listitem>
</varlistentry>
</variablelist>