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

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Message-ID: <CABCoZhCfdJWG-Apvm32sRzHrYh3YDT03SAONeNCiwXm_gtVqrw@mail.gmail.com>
Date: Thu, 5 Dec 2024 12:34:20 -0800
From: anish kumar <yesanishhere@...il.com>
To: Charles Keepax <ckeepax@...nsource.cirrus.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, Bagas Sanjaya <bagasdotme@...il.com>
Subject: Re: [PATCH V4] Docs/sound: Update codec-to-codec documentation

Hello Charles,

Wondering if the latest version works for you?

On Mon, Nov 11, 2024 at 5:17 PM anish kumar <yesanishhere@...il.com> wrote:
>
> On Mon, Nov 11, 2024 at 4:54 PM Bagas Sanjaya <bagasdotme@...il.com> wrote:
> >
> > On Sun, Nov 10, 2024 at 01:30:12PM -0800, anish kumar wrote:
> > > 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.
> >
> > What do you mean?
> >
> > > > > +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.
> >
> > Sorry again but what do you mean? Keep it as-is?
>
> Yes it is more developer friendly.
> >
> > Confused...
> >
> > --
> > An old man doll... just what I always wanted! - Clara