[media] v4l: Add V4L2_MBUS_FMT_JPEG_1X8 media bus format

Add V4L2_MBUS_FMT_JPEG_1X8 format and the corresponding Docbook
documentation.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 49 insertions, 0 deletions

diff --git a/Documentation/DocBook/v4l/subdev-formats.xml b/Documentation/DocBook/v4l/subdev-formats.xml
index d7ccd25edcc1..a26b10c07857 100644
--- a/Documentation/DocBook/v4l/subdev-formats.xml
+++ b/Documentation/DocBook/v4l/subdev-formats.xml
@@ -2522,5 +2522,51 @@
         </tgroup>
       </table>
     </section>
+
+    <section>
+      <title>JPEG Compressed Formats</title>
+
+      <para>Those data formats consist of an ordered sequence of 8-bit bytes
+        obtained from JPEG compression process. Additionally to the
+        <constant>_JPEG</constant> prefix the format code is made of
+        the following information.
+        <itemizedlist>
+          <listitem>The number of bus samples per entropy encoded byte.</listitem>
+          <listitem>The bus width.</listitem>
+        </itemizedlist>
+
+        <para>For instance, for a JPEG baseline process and an 8-bit bus width
+          the format will be named <constant>V4L2_MBUS_FMT_JPEG_1X8</constant>.
+        </para>
+      </para>
+
+      <para>The following table lists existing JPEG compressed formats.</para>
+
+      <table pgwide="0" frame="none" id="v4l2-mbus-pixelcode-jpeg">
+        <title>JPEG Formats</title>
+        <tgroup cols="3">
+          <colspec colname="id" align="left" />
+          <colspec colname="code" align="left"/>
+          <colspec colname="remarks" align="left"/>
+          <thead>
+            <row>
+              <entry>Identifier</entry>
+              <entry>Code</entry>
+              <entry>Remarks</entry>
+            </row>
+          </thead>
+          <tbody valign="top">
+            <row id="V4L2-MBUS-FMT-JPEG-1X8">
+              <entry>V4L2_MBUS_FMT_JPEG_1X8</entry>
+              <entry>0x4001</entry>
+              <entry>Besides of its usage for the parallel bus this format is
+                recommended for transmission of JPEG data over MIPI CSI bus
+                using the User Defined 8-bit Data types.
+              </entry>
+            </row>
+          </tbody>
+        </tgroup>
+      </table>
+    </section>
   </section>
 </section>
diff --git a/include/linux/v4l2-mediabus.h b/include/linux/v4l2-mediabus.h
index de5c15921025..5ea7f753a348 100644
--- a/include/linux/v4l2-mediabus.h
+++ b/include/linux/v4l2-mediabus.h
@@ -89,6 +89,9 @@ enum v4l2_mbus_pixelcode {
         V4L2_MBUS_FMT_SGBRG12_1X12 = 0x3010,
         V4L2_MBUS_FMT_SGRBG12_1X12 = 0x3011,
         V4L2_MBUS_FMT_SRGGB12_1X12 = 0x3012,
+
+        /* JPEG compressed formats - next is 0x4002 */
+        V4L2_MBUS_FMT_JPEG_1X8 = 0x4001,
 };
 
 /**