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[PATCH 09/15] media: fe_property_parameters.rst: better document bandwidth

From Mauro Carvalho Chehab <mchehab@s-opensource.com>
Newsgroups linux.kernel
Subject [PATCH 09/15] media: fe_property_parameters.rst: better document bandwidth
Date 2017-09-01 01:50 +0200
Message-ID <ukHnH-41L-7@gated-at.bofh.it> (permalink)
References <ukHnH-41L-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

Use a table to document the supported bandwidths. That makes
it clearer to readers.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
---
 .../media/uapi/dvb/fe_property_parameters.rst      | 44 +++++++++++++---------
 1 file changed, 26 insertions(+), 18 deletions(-)

diff --git a/Documentation/media/uapi/dvb/fe_property_parameters.rst b/Documentation/media/uapi/dvb/fe_property_parameters.rst
index e085e84fef38..49470f7dda02 100644
--- a/Documentation/media/uapi/dvb/fe_property_parameters.rst
+++ b/Documentation/media/uapi/dvb/fe_property_parameters.rst
@@ -116,30 +116,38 @@ Should be set only for terrestrial delivery systems.
 Possible values: ``1712000``, ``5000000``, ``6000000``, ``7000000``,
 ``8000000``, ``10000000``.
 
+======================= =======================================================
+Terrestrial Standard	Possible values for bandwidth
+======================= =======================================================
+ATSC (version 1)	No need to set. It is always 6MHz.
+DMTB			No need to set. It is always 8MHz.
+DVB-T			6MHz, 7MHz and 8MHz.
+DVB-T2			1.172 MHz, 5MHz, 6MHz, 7MHz, 8MHz and 10MHz
+ISDB-T			5MHz, 6MHz, 7MHz and 8MHz, although most places
+			use 6MHz.
+======================= =======================================================
+
+
 .. note::
 
-  #. DVB-T supports 6, 7 and 8MHz.
 
-  #. DVB-T2 supports 1.172, 5, 6, 7, 8 and 10MHz.
+  #. For ISDB-Tsb, the bandwidth can vary depending on the number of
+     connected segments.
 
-  #. ISDB-T supports 5MHz, 6MHz, 7MHz and 8MHz, although most
-     places use 6MHz.
-
-  #. On DVB-C and DVB-S/S2, the bandwidth depends on the symbol rate.
-     So, the Kernel will silently ignore setting :ref:`DTV-BANDWIDTH-HZ`.
-
-  #. For DVB-C and DVB-S/S2, the Kernel will return an estimation of the
-     bandwidth, calculated from :ref:`DTV-SYMBOL-RATE` and from
-     the rolloff, with is fixed for DVB-C and DVB-S.
-
-  #. For DVB-S2, the bandwidth estimation will use :ref:`DTV-ROLLOFF`.
-
-  #. For ISDB-Tsb, it can vary depending on the number of connected
-     segments.
-
-  #. Bandwidth in ISDB-Tsb can be easily derived from other parameters
+     It can be easily derived from other parameters
      (DTV_ISDBT_SB_SEGMENT_IDX, DTV_ISDBT_SB_SEGMENT_COUNT).
 
+  #. On Satellite and Cable delivery systems, the bandwidth depends on
+     the symbol rate. So, the Kernel will silently ignore any setting
+     :ref:`DTV-BANDWIDTH-HZ`. I will however fill it back with a
+     bandwidth estimation.
+
+     Such bandwidth estimation takes into account the symbol rate set with
+     :ref:`DTV-SYMBOL-RATE`, and the rolloff factor, with is fixed for
+     DVB-C and DVB-S.
+
+     For DVB-S2, the rolloff should also be set via :ref:`DTV-ROLLOFF`.
+
 
 .. _DTV-INVERSION:
 
-- 
2.13.5

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[PATCH 00/15] Improve DVB documentation and reduce its gap Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 01:50 +0200
  [PATCH 13/15] media: dmx.h: get rid of GET_DMX_EVENT Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 01:50 +0200
  [PATCH 06/15] media: dvb/frontend.h: document the uAPI file Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 01:50 +0200
  [PATCH 09/15] media: fe_property_parameters.rst: better document bandwidth Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 01:50 +0200
  [PATCH 02/15] media: dvb/intro: update references for TV standards Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 01:50 +0200
  [PATCH 11/15] media: dmx.h: get rid of DMX_GET_CAPS Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 01:50 +0200
  [PATCH 05/15] media: dvb/frontend.h: move out a private internal structure Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 02:00 +0200
  [PATCH 04/15] media: dvb/intro: adjust the notices about optional hardware Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 02:00 +0200
  [PATCH 12/15] media: dmx.h: get rid of DMX_SET_SOURCE Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 02:00 +0200
    Re: [PATCH 12/15] media: dmx.h: get rid of DMX_SET_SOURCE Honza Petrouš <jpetrous@gmail.com> - 2017-09-01 08:30 +0200
      Re: [PATCH 12/15] media: dmx.h: get rid of DMX_SET_SOURCE Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 11:40 +0200
        Re: [PATCH 12/15] media: dmx.h: get rid of DMX_SET_SOURCE Honza Petrouš <jpetrous@gmail.com> - 2017-09-01 12:00 +0200
          Re: [PATCH 12/15] media: dmx.h: get rid of DMX_SET_SOURCE Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 12:50 +0200
            Re: [PATCH 12/15] media: dmx.h: get rid of DMX_SET_SOURCE Honza Petrouš <jpetrous@gmail.com> - 2017-09-01 13:20 +0200
              Re: [PATCH 12/15] media: dmx.h: get rid of DMX_SET_SOURCE Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 15:10 +0200
  [PATCH 14/15] media: dmx.h: add kernel-doc markups and use it at Documentation/ Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 02:00 +0200
  [PATCH 15/15] media: net.rst: Fix the level of a section of the net chapter Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 02:00 +0200
  [PATCH 08/15] media: fe_property_parameters.rst: better define properties usage Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 02:00 +0200
  [PATCH 10/15] media: dmx.h: get rid of unused DMX_KERNEL_CLIENT Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 02:00 +0200
  [PATCH 01/15] media: dvb/intro: use the term Digital TV to refer to the system Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 02:00 +0200
  [PATCH 03/15] media: dvb/intro: update the history part of the document Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 02:00 +0200
  Re: [PATCH 00/15] Improve DVB documentation and reduce its gap Honza Petrouš <jpetrous@gmail.com> - 2017-09-01 10:50 +0200
    Re: [PATCH 00/15] Improve DVB documentation and reduce its gap Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-09-01 11:40 +0200
      Re: [PATCH 00/15] Improve DVB documentation and reduce its gap Soeren Moch <smoch@web.de> - 2017-09-04 03:00 +0200
        Re: [PATCH 00/15] Improve DVB documentation and reduce its gap Mauro Carvalho Chehab <mchehab@infradead.org> - 2017-09-04 13:40 +0200
          Re: [PATCH 00/15] Improve DVB documentation and reduce its gap Soeren Moch <smoch@web.de> - 2017-09-09 15:00 +0200

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