linux-kernel - Re: [RFC PATCH v2 0/7] AC97 device/driver model revamp

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Date:   Wed, 24 Aug 2016 12:39:53 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:     Takashi Iwai <tiwai@...e.com>, Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, patches@...nsource.wolfsonmicro.com
Subject: Re: [RFC PATCH v2 0/7] AC97 device/driver model revamp

On Tue, Aug 23, 2016 at 06:39:35PM +0200, Robert Jarzmik wrote:

> In the old ac97 bus, the match function was always returning "true", and the
> driver did probe. With this new implementation, the ac97 is discovered and
> sound/soc/codecs/wm9713.c#wm9713_ac97_probe() is called. I don't export
> ac97_bus_type (nor want to do it), and only _one_ device is created upon
> discovery, while the wm97xx-core.c would benefic a second ac97 device.

> I'm wondering how to work around this :
>  - either I add a wm97xx-ts ac97 device in wm9713_ac97_probe()
>  - or I add a platform device in wm9713_ac97_probe() and add a new
>    platform_driver in wm97xx-core ...
>  - or something smarter

That device really should be a MFD.

> What's behind this question is : should I keep to my initial solution of 1 ac97
> device discovered is bound on the ac97 to _at most_ 1 ac97 driver, or is there a
> know smart way to have several drivers for one device (that sounds a bit heretic
> regarding my understanding of the device/driver model but who knows ...) ?

MFDs are how we do multiple drivers per device.

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