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Subject[PATCH v2 11/27] media: fe_property_parameters.rst: better document bandwidth
Date
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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