![](https://secure.gravatar.com/avatar/21e064954b6d53c5819350c0fc675be0.jpg?s=120&d=mm&r=g)
Ivan Orlov ivan.orlov0322@gmail.com writes:
Add documentation for the new MARIAN Seraph M2 sound card. It covers current development status, available controls of the card and information about the integrated loopback.
Signed-off-by: Ivan Orlov ivan.orlov0322@gmail.com
V1 -> V2:
- Remove redundant documentation fix from the next patch in the series
One quick comment below...
Documentation/sound/cards/index.rst | 1 + Documentation/sound/cards/marian-m2.rst | 104 ++++++++++++++++++++++++ 2 files changed, 105 insertions(+) create mode 100644 Documentation/sound/cards/marian-m2.rst
diff --git a/Documentation/sound/cards/index.rst b/Documentation/sound/cards/index.rst index e68bbb13c384..e873592d8d00 100644 --- a/Documentation/sound/cards/index.rst +++ b/Documentation/sound/cards/index.rst @@ -19,3 +19,4 @@ Card-Specific Information serial-u16550 img-spdif-in pcmtest
- marian-m2
diff --git a/Documentation/sound/cards/marian-m2.rst b/Documentation/sound/cards/marian-m2.rst new file mode 100644 index 000000000000..bf12445e20d7 --- /dev/null +++ b/Documentation/sound/cards/marian-m2.rst @@ -0,0 +1,104 @@ +.. SPDX-License-Identifier: GPL-2.0
+======================= +MARIAN Seraph M2 Driver +=======================
+Sep 18, 2023
+Ivan Orlov ivan.orlov0322@gmail.com
+STATE OF DEVELOPMENT +====================
+This driver is based on the driver written by Florian Faber in 2012, which seemed to work fine. +However, the initial code contained multiple issues, which had to be solved before sending the +driver upstream.
Sticking to the 80-column limit is best for documentation, especially when there is no reason to go over it.
+The vendor lost the full documentation, so what we have here was recovered from drafts and found +after experiments with the card.
+What seems to be working fine: +- Playback and capture for all supported rates +- Integrated loopback (with some exceptions, see below)
+MEMORY MODEL +============
+The hardware requires one huge contiguous DMA space to be allocated. After allocation, the bus address of +this buffer should be written to the hardware register.
+We can split this space into two parts: the first one contains samples for capture, another one contains +play samples:
+CAPTURE_CH_0, CAPTURE_CH_1, ..., CAPTURE_CH_127 | PLAY_CH_0, PLAY_CH_1, ..., PLAY_CH_127
You should really use literal blocks for this (and a lot that follows) or it won't render the way you want in HTML. The simplest way to do that is to use a double colon ("...samples::") and to indent the literal text.
(OK, two comments, sorry about the off-by-one...:)
Thanks,
jon