linux-kernel - Re: [PATCH v2 1/2] ALSA: docs: Add Marian M2 driver documentation

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Message-ID: <cfd84f9f-a549-a90d-5a24-b4f36ab085df@gmail.com>
Date:   Tue, 19 Sep 2023 12:49:49 +0400
From:   Ivan Orlov <ivan.orlov0322@...il.com>
To:     Jonathan Corbet <corbet@....net>, perex@...ex.cz, tiwai@...e.com
Cc:     alsa-devel@...a-project.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org
Subject: Re: [PATCH v2 1/2] ALSA: docs: Add Marian M2 driver documentation

On 9/19/23 11:57, Jonathan Corbet wrote:
> Ivan Orlov <ivan.orlov0322@...il.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@...il.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@...il.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

Hi Jonathan,

Thank you for the review, I'll rewrite the documentation so it will 
follow the 80-column rule. Also, in the next version I will use the 
literal blocks.

Thanks again!

--
Kind regards,
Ivan Orlov