linux-kernel - Re: [PATCH V4] Docs/sound: Update codec-to-codec documentation

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Message-ID: <CABCoZhCapQBCj=UJ78XWtzier5m34zX+bwSo4bPxEVkOdZSxRA@mail.gmail.com>
Date: Sun, 10 Nov 2024 13:30:12 -0800
From: anish kumar <yesanishhere@...il.com>
To: Bagas Sanjaya <bagasdotme@...il.com>
Cc: lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz, tiwai@...e.com, 
	corbet@....net, linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org, 
	linux-doc@...r.kernel.org
Subject: Re: [PATCH V4] Docs/sound: Update codec-to-codec documentation

On Thu, Oct 31, 2024 at 7:13 PM Bagas Sanjaya <bagasdotme@...il.com> wrote:
>
> On Thu, Oct 31, 2024 at 02:14:11PM -0700, anish kumar wrote:
> > Updated documentation to provide more details
> > for codec-to-codec connection especially around
> > the scenarios and DAPM core details for C2C
> > creation.
> "Describe in more detail codec-to-codec connection, especially on
> use cases and DAPM core details for C2C creation."

Sorry, I like the way it is written.
> > +An ALSA-based audio system typically involves playback and capture
> > +functionality, where users may require audio file playback through
> > +speakers or recording from microphones. However, certain systems
> > +necessitate audio data routing directly between components, such as FM
> > +radio to speakers, without CPU involvement. For such scenarios, ASoC(
> > +ALSA system on chip) provides a mechanism known as codec-to-codec (C2C)
> "For such scenarios, ASoC (ALSA system on chip) ..."
> > +connections, leveraging the Dynamic Audio Power Management (DAPM)
> > +framework to facilitate direct data transfers between codecs.
> > <snipped>...
> > +To better understand the configuration inspired by the setup found in
> > +``sound/soc/samsung/speyside.c``, here are several key points:
> > +
> > +1. The presence of ``c2c_params`` informs the DAPM core that the DAI link
> > +   represents a C2C connection.
> > +
> > +2. ``c2c_params`` can be an array, and ``num_c2c_params`` defines the size
> > +   of this array.
> > +
> > +3. If ``num_c2c_params`` is 1:
> > +
> > +   - The C2C DAI is configured with the provided ``snd_soc_pcm_stream``
> > +     parameters.
> > +
> > +4. If ``num_c2c_params`` is greater than 1:
> > +
> > +   - A kcontrol is created, allowing the user to select the index of the
> > +     ``c2c_params`` array to be used.
>
> I guess #3 and #4 can be combined, i.e. "If ``num_c2c_params`` is 1, ...;
> otherwise if ``num_c2c_params`` is greater than 1, ...".

I like it this way.
>
> Thanks.
>
> --
> An old man doll... just what I always wanted! - Clara