[media] doc_rst: media: New SDR formats PC16, PC18 & PC20

This patch adds documentation for the three new SDR formats

V4L2_SDR_FMT_PCU16BE
V4L2_SDR_FMT_PCU18BE
V4L2_SDR_FMT_PCU20BE

Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/v4l/pixfmt-sdr-pcu16be.rst

@@ -0,0 +1,55 @@
+.. -*- coding: utf-8; mode: rst -*-
+
+.. _V4L2-SDR-FMT-PCU16BE:
+
+******************************
+V4L2_SDR_FMT_PCU16BE ('PC16')
+******************************
+
+Planar complex unsigned 16-bit big endian IQ sample
+
+Description
+===========
+
+This format contains a sequence of complex number samples. Each complex
+number consist of two parts called In-phase and Quadrature (IQ). Both I
+and Q are represented as a 16 bit unsigned big endian number stored in
+32 bit space. The remaining unused bits within the 32 bit space will be
+padded with 0. I value starts first and Q value starts at an offset
+equalling half of the buffer size (i.e.) offset = buffersize/2. Out of
+the 16 bits, bit 15:2 (14 bit) is data and bit 1:0 (2 bit) can be any
+value.
+
+**Byte Order.**
+Each cell is one byte.
+
+.. flat-table::
+    :header-rows:  1
+    :stub-columns: 0
+
+    * -  Offset:
+      -  Byte B0
+      -  Byte B1
+      -  Byte B2
+      -  Byte B3
+    * -  start + 0:
+      -  I'\ :sub:`0[13:6]`
+      -  I'\ :sub:`0[5:0]; B1[1:0]=pad`
+      -  pad
+      -  pad
+    * -  start + 4:
+      -  I'\ :sub:`1[13:6]`
+      -  I'\ :sub:`1[5:0]; B1[1:0]=pad`
+      -  pad
+      -  pad
+    * -  ...
+    * - start + offset:
+      -  Q'\ :sub:`0[13:6]`
+      -  Q'\ :sub:`0[5:0]; B1[1:0]=pad`
+      -  pad
+      -  pad
+    * - start + offset + 4:
+      -  Q'\ :sub:`1[13:6]`
+      -  Q'\ :sub:`1[5:0]; B1[1:0]=pad`
+      -  pad
+      -  pad

Documentation/media/uapi/v4l/pixfmt-sdr-pcu18be.rst

@@ -0,0 +1,55 @@
+.. -*- coding: utf-8; mode: rst -*-
+
+.. _V4L2-SDR-FMT-PCU18BE:
+
+******************************
+V4L2_SDR_FMT_PCU18BE ('PC18')
+******************************
+
+Planar complex unsigned 18-bit big endian IQ sample
+
+Description
+===========
+
+This format contains a sequence of complex number samples. Each complex
+number consist of two parts called In-phase and Quadrature (IQ). Both I
+and Q are represented as a 18 bit unsigned big endian number stored in
+32 bit space. The remaining unused bits within the 32 bit space will be
+padded with 0. I value starts first and Q value starts at an offset
+equalling half of the buffer size (i.e.) offset = buffersize/2. Out of
+the 18 bits, bit 17:2 (16 bit) is data and bit 1:0 (2 bit) can be any
+value.
+
+**Byte Order.**
+Each cell is one byte.
+
+.. flat-table::
+    :header-rows:  1
+    :stub-columns: 0
+
+    * -  Offset:
+      -  Byte B0
+      -  Byte B1
+      -  Byte B2
+      -  Byte B3
+    * -  start + 0:
+      -  I'\ :sub:`0[17:10]`
+      -  I'\ :sub:`0[9:2]`
+      -  I'\ :sub:`0[1:0]; B2[5:0]=pad`
+      -  pad
+    * -  start + 4:
+      -  I'\ :sub:`1[17:10]`
+      -  I'\ :sub:`1[9:2]`
+      -  I'\ :sub:`1[1:0]; B2[5:0]=pad`
+      -  pad
+    * -  ...
+    * - start + offset:
+      -  Q'\ :sub:`0[17:10]`
+      -  Q'\ :sub:`0[9:2]`
+      -  Q'\ :sub:`0[1:0]; B2[5:0]=pad`
+      -  pad
+    * - start + offset + 4:
+      -  Q'\ :sub:`1[17:10]`
+      -  Q'\ :sub:`1[9:2]`
+      -  Q'\ :sub:`1[1:0]; B2[5:0]=pad`
+      -  pad

Documentation/media/uapi/v4l/pixfmt-sdr-pcu20be.rst

@@ -0,0 +1,54 @@
+.. -*- coding: utf-8; mode: rst -*-
+.. _V4L2-SDR-FMT-PCU20BE:
+
+******************************
+V4L2_SDR_FMT_PCU20BE ('PC20')
+******************************
+
+Planar complex unsigned 20-bit big endian IQ sample
+
+Description
+===========
+
+This format contains a sequence of complex number samples. Each complex
+number consist of two parts called In-phase and Quadrature (IQ). Both I
+and Q are represented as a 20 bit unsigned big endian number stored in
+32 bit space. The remaining unused bits within the 32 bit space will be
+padded with 0. I value starts first and Q value starts at an offset
+equalling half of the buffer size (i.e.) offset = buffersize/2. Out of
+the 20 bits, bit 19:2 (18 bit) is data and bit 1:0 (2 bit) can be any
+value.
+
+**Byte Order.**
+Each cell is one byte.
+
+.. flat-table::
+    :header-rows:  1
+    :stub-columns: 0
+
+    * -  Offset:
+      -  Byte B0
+      -  Byte B1
+      -  Byte B2
+      -  Byte B3
+    * -  start + 0:
+      -  I'\ :sub:`0[19:12]`
+      -  I'\ :sub:`0[11:4]`
+      -  I'\ :sub:`0[3:0]; B2[3:0]=pad`
+      -  pad
+    * -  start + 4:
+      -  I'\ :sub:`1[19:12]`
+      -  I'\ :sub:`1[11:4]`
+      -  I'\ :sub:`1[3:0]; B2[3:0]=pad`
+      -  pad
+    * -  ...
+    * - start + offset:
+      -  Q'\ :sub:`0[19:12]`
+      -  Q'\ :sub:`0[11:4]`
+      -  Q'\ :sub:`0[3:0]; B2[3:0]=pad`
+      -  pad
+    * - start + offset + 4:
+      -  Q'\ :sub:`1[19:12]`
+      -  Q'\ :sub:`1[11:4]`
+      -  Q'\ :sub:`1[3:0]; B2[3:0]=pad`
+      -  pad

Documentation/media/uapi/v4l/sdr-formats.rst

@@ -17,3 +17,6 @@ These formats are used for :ref:`SDR <sdr>` interface only.
     pixfmt-sdr-cs08
     pixfmt-sdr-cs14le
     pixfmt-sdr-ru12le
+    pixfmt-sdr-pcu16be
+    pixfmt-sdr-pcu18be
+    pixfmt-sdr-pcu20be