[media] v4l: Clean up sub-device format documentation

The sub-device format documentation documented scaling configuration through
formats. Instead the compose selection rectangle is elsewhere documented to
be used for the purpose. Remove scaling related part of the documentation.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 63 insertions, 46 deletions

diff --git a/Documentation/DocBook/media/v4l/dev-subdev.xml b/Documentation/DocBook/media/v4l/dev-subdev.xml
index d15aaf83f56f..4f0ba58c9bd9 100644
--- a/Documentation/DocBook/media/v4l/dev-subdev.xml
+++ b/Documentation/DocBook/media/v4l/dev-subdev.xml
@@ -195,53 +195,59 @@
         <title>Sample Pipeline Configuration</title>
         <tgroup cols="3">
           <colspec colname="what"/>
-          <colspec colname="sensor-0" />
-          <colspec colname="frontend-0" />
-          <colspec colname="frontend-1" />
-          <colspec colname="scaler-0" />
-          <colspec colname="scaler-1" />
+          <colspec colname="sensor-0 format" />
+          <colspec colname="frontend-0 format" />
+          <colspec colname="frontend-1 format" />
+          <colspec colname="scaler-0 format" />
+          <colspec colname="scaler-0 compose" />
+          <colspec colname="scaler-1 format" />
           <thead>
             <row>
               <entry></entry>
-              <entry>Sensor/0</entry>
-              <entry>Frontend/0</entry>
-              <entry>Frontend/1</entry>
-              <entry>Scaler/0</entry>
-              <entry>Scaler/1</entry>
+              <entry>Sensor/0 format</entry>
+              <entry>Frontend/0 format</entry>
+              <entry>Frontend/1 format</entry>
+              <entry>Scaler/0 format</entry>
+              <entry>Scaler/0 compose selection rectangle</entry>
+              <entry>Scaler/1 format</entry>
             </row>
           </thead>
           <tbody valign="top">
             <row>
               <entry>Initial state</entry>
-              <entry>2048x1536</entry>
-              <entry>-</entry>
-              <entry>-</entry>
-              <entry>-</entry>
-              <entry>-</entry>
+              <entry>2048x1536/SGRBG8_1X8</entry>
+              <entry>(default)</entry>
+              <entry>(default)</entry>
+              <entry>(default)</entry>
+              <entry>(default)</entry>
+              <entry>(default)</entry>
             </row>
             <row>
-              <entry>Configure frontend input</entry>
-              <entry>2048x1536</entry>
-              <entry><emphasis>2048x1536</emphasis></entry>
-              <entry><emphasis>2046x1534</emphasis></entry>
-              <entry>-</entry>
-              <entry>-</entry>
+              <entry>Configure frontend sink format</entry>
+              <entry>2048x1536/SGRBG8_1X8</entry>
+              <entry><emphasis>2048x1536/SGRBG8_1X8</emphasis></entry>
+              <entry><emphasis>2046x1534/SGRBG8_1X8</emphasis></entry>
+              <entry>(default)</entry>
+              <entry>(default)</entry>
+              <entry>(default)</entry>
             </row>
             <row>
-              <entry>Configure scaler input</entry>
-              <entry>2048x1536</entry>
-              <entry>2048x1536</entry>
-              <entry>2046x1534</entry>
-              <entry><emphasis>2046x1534</emphasis></entry>
-              <entry><emphasis>2046x1534</emphasis></entry>
+              <entry>Configure scaler sink format</entry>
+              <entry>2048x1536/SGRBG8_1X8</entry>
+              <entry>2048x1536/SGRBG8_1X8</entry>
+              <entry>2046x1534/SGRBG8_1X8</entry>
+              <entry><emphasis>2046x1534/SGRBG8_1X8</emphasis></entry>
+              <entry><emphasis>0,0/2046x1534</emphasis></entry>
+              <entry><emphasis>2046x1534/SGRBG8_1X8</emphasis></entry>
             </row>
             <row>
-              <entry>Configure scaler output</entry>
-              <entry>2048x1536</entry>
-              <entry>2048x1536</entry>
-              <entry>2046x1534</entry>
-              <entry>2046x1534</entry>
-              <entry><emphasis>1280x960</emphasis></entry>
+              <entry>Configure scaler sink compose selection</entry>
+              <entry>2048x1536/SGRBG8_1X8</entry>
+              <entry>2048x1536/SGRBG8_1X8</entry>
+              <entry>2046x1534/SGRBG8_1X8</entry>
+              <entry>2046x1534/SGRBG8_1X8</entry>
+              <entry><emphasis>0,0/1280x960</emphasis></entry>
+              <entry><emphasis>1280x960/SGRBG8_1X8</emphasis></entry>
             </row>
           </tbody>
         </tgroup>
@@ -249,19 +255,30 @@
 
       <para>
       <orderedlist>
-        <listitem><para>Initial state. The sensor output is set to its native 3MP
-        resolution. Resolutions on the host frontend and scaler input and output
-        pads are undefined.</para></listitem>
-        <listitem><para>The application configures the frontend input pad resolution to
-        2048x1536. The driver propagates the format to the frontend output pad.
-        Note that the propagated output format can be different, as in this case,
-        than the input format, as the hardware might need to crop pixels (for
-        instance when converting a Bayer filter pattern to RGB or YUV).</para></listitem>
-        <listitem><para>The application configures the scaler input pad resolution to
-        2046x1534 to match the frontend output resolution. The driver propagates
-        the format to the scaler output pad.</para></listitem>
-        <listitem><para>The application configures the scaler output pad resolution to
-        1280x960.</para></listitem>
+        <listitem><para>Initial state. The sensor source pad format is
+        set to its native 3MP size and V4L2_MBUS_FMT_SGRBG8_1X8
+        media bus code. Formats on the host frontend and scaler sink
+        and source pads have the default values, as well as the
+        compose rectangle on the scaler's sink pad.</para></listitem>
+
+        <listitem><para>The application configures the frontend sink
+        pad format's size to 2048x1536 and its media bus code to
+        V4L2_MBUS_FMT_SGRBG_1X8. The driver propagates the format to
+        the frontend source pad.</para></listitem>
+
+        <listitem><para>The application configures the scaler sink pad
+        format's size to 2046x1534 and the media bus code to
+        V4L2_MBUS_FMT_SGRBG_1X8 to match the frontend source size and
+        media bus code. The media bus code on the sink pad is set to
+        V4L2_MBUS_FMT_SGRBG_1X8. The driver propagates the size to the
+        compose selection rectangle on the scaler's sink pad, and the
+        format to the scaler source pad.</para></listitem>
+
+        <listitem><para>The application configures the size of the compose
+        selection rectangle of the scaler's sink pad 1280x960. The driver
+        propagates the size to the scaler's source pad
+        format.</para></listitem>
+
       </orderedlist>
       </para>