[media] DocBook: Software Defined Radio Interface

Document V4L2 SDR interface.

Cc: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
diff --git a/Documentation/DocBook/media/v4l/io.xml b/Documentation/DocBook/media/v4l/io.xml
index 2c4c068..1fb11e8 100644
--- a/Documentation/DocBook/media/v4l/io.xml
+++ b/Documentation/DocBook/media/v4l/io.xml
@@ -1005,6 +1005,12 @@
 	    <entry>Buffer for video output overlay (OSD), see <xref
 		linkend="osd" />.</entry>
 	  </row>
+	  <row>
+	    <entry><constant>V4L2_BUF_TYPE_SDR_CAPTURE</constant></entry>
+	    <entry>11</entry>
+	    <entry>Buffer for Software Defined Radio (SDR), see <xref
+		linkend="sdr" />.</entry>
+	  </row>
 	</tbody>
       </tgroup>
     </table>