linux-kernel - Re: [PATCH 1/4] ASoC: wm9713: add binding for WM9713 codec

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Date:	Sat, 20 Feb 2016 23:24:02 +0100
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Mark Brown <broonie@...nel.org>
Cc:	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
	patches@...nsource.wolfsonmicro.com
Subject: Re: [PATCH 1/4] ASoC: wm9713: add binding for WM9713 codec

Mark Brown <broonie@...nel.org> writes:

> On Sat, Feb 20, 2016 at 09:32:58PM +0100, Robert Jarzmik wrote:
>> Mark Brown <broonie@...nel.org> writes:
>> > On Sat, Feb 20, 2016 at 07:22:04PM +0100, Robert Jarzmik wrote:
>> I will. By now I fail to see how this will help in the wm9713 probing and
>> detection ...
>
> It will eumerate the AC'97 bus by itself and does not need the CODEC to
> be described.
I think I still don't get it.

So let's rephrase it another way : how will the function wm9713_probe() be
called, ie. what is the possible function backtrace leading to that call ?

>> Until I make the try, here is what I have as a device-tree extract in [1],
>> which is my candidate for sound/soc/pxa/zylonite.c replacement.. If we
>> conclude that wm9713 shouldn't be in device-tree, then I'm curious how the
>> DAI bindings (simple-audio-card,dai-link*) should be handled.
>
> They should be created as a function of enumerating the CODEC.  If you
> use the genric AC'97 stuff it doesn't use ASoC at all and this happens
> as a side effect.
I don't get that either. For me sound/soc/pci/ac97/ac97_codec.c is PCI specific,
not generic, so what is "generic AC'97 stuff" ? I will never be able to use it
as on my platforms CONFIG_PCI=n.

Do you have a devicetree example somewhere, with (ac97 host, audio codec) pair I
can have a look at to understand ?

Cheers.

-- 
Robert