3 files changed, 25 insertions, 1 deletions

diff --git a/Documentation/DocBook/media/v4l/compat.xml b/Documentation/DocBook/media/v4l/compat.xml
index ce1004a7da52..91410b6e7e08 100644
--- a/Documentation/DocBook/media/v4l/compat.xml
+++ b/Documentation/DocBook/media/v4l/compat.xml
@@ -2370,6 +2370,14 @@ that used it. It was originally scheduled for removal in 2.6.35.
         </listitem>
       </orderedlist>
     </section>
+    <section>
+      <title>V4L2 in Linux 3.2</title>
+      <orderedlist>
+        <listitem>
+          <para>V4L2_CTRL_FLAG_VOLATILE was added to signal volatile controls to userspace.</para>
+        </listitem>
+      </orderedlist>
+    </section>
 
     <section id="other">
       <title>Relation of V4L2 to other Linux multimedia APIs</title>
diff --git a/Documentation/DocBook/media/v4l/v4l2.xml b/Documentation/DocBook/media/v4l/v4l2.xml
index 0d05e8747c12..40132c277647 100644
--- a/Documentation/DocBook/media/v4l/v4l2.xml
+++ b/Documentation/DocBook/media/v4l/v4l2.xml
@@ -128,6 +128,13 @@ structs, ioctls) must be noted in more detail in the history chapter
 applications. -->
 
       <revision>
+        <revnumber>3.2</revnumber>
+        <date>2011-08-26</date>
+        <authorinitials>hv</authorinitials>
+        <revremark>Added V4L2_CTRL_FLAG_VOLATILE.</revremark>
+      </revision>
+
+      <revision>
         <revnumber>3.1</revnumber>
         <date>2011-06-27</date>
         <authorinitials>mcc, po, hv</authorinitials>
@@ -410,7 +417,7 @@ and discussions on the V4L mailing list.</revremark>
 </partinfo>
 
 <title>Video for Linux Two API Specification</title>
- <subtitle>Revision 3.1</subtitle>
+ <subtitle>Revision 3.2</subtitle>
 
   <chapter id="common">
     &sub-common;
diff --git a/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml b/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml
index 677ea646c29f..0ac0057a51c4 100644
--- a/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml
@@ -406,6 +406,15 @@ flag is typically present for relative controls or action controls where
 writing a value will cause the device to carry out a given action
 (&eg; motor control) but no meaningful value can be returned.</entry>
           </row>
+          <row>
+            <entry><constant>V4L2_CTRL_FLAG_VOLATILE</constant></entry>
+            <entry>0x0080</entry>
+            <entry>This control is volatile, which means that the value of the control
+changes continuously. A typical example would be the current gain value if the device
+is in auto-gain mode. In such a case the hardware calculates the gain value based on
+the lighting conditions which can change over time. Note that setting a new value for
+a volatile control will have no effect. The new value will just be ignored.</entry>
+          </row>
         </tbody>
       </tgroup>
     </table>