linux-kernel - Re: [alsa-devel] [PATCH 0/2] soundwire: fix Kconfig select/depend issues

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Date:   Fri, 12 Apr 2019 15:27:48 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, vkoul@...nel.org, gregkh@...uxfoundation.org,
        liam.r.girdwood@...ux.intel.com, jank@...ence.com, joe@...ches.com
Subject: Re: [alsa-devel] [PATCH 0/2] soundwire: fix Kconfig select/depend
 issues

On Fri, Apr 12, 2019 at 09:17:35AM -0500, Pierre-Louis Bossart wrote:
> On 4/12/19 5:06 AM, Srinivas Kandagatla wrote:
> > On 11/04/2019 20:28, Pierre-Louis Bossart wrote:

> > > 0-day/Kbuild starts complaining about missed module dependencies and
> > > compilation issues. Since codecs and soc drivers need to be compilable
> > > independently, let's fix this using the following model:

> > > SOUNDWIRE_INTEL ---- select -----------
> > >                                        |
> > >                       v
> > > REGMAP_SOUNDWIRE --- select ---> SOUNDWIRE_BUS

> > Last time when I looked at this, Kconfig symbols SOUNDWIRE_BUS and
> > SOUNDWIRE looked totally redundant and bit over done.

> > Removing SOUNDWIRE_BUS Kconfig did clean it up and made it bit more
> > align with others

> Good point, but no. This is intentional and follows the Kconfig pattern
> pattern described by Takashi at https://lkml.org/lkml/2017/11/17/47

> yes, this SOUNDWIRE is overkill for now, but let's assume there is a second
> non-intel implementation (which I understand as very likely given all the
> threads on ARM64 support). In that case you'd really want a top-level
> selector option that has no actual compilation impact - not used in any
> Makefile or code - but enables the sub-options and let users/distros select
> the platforms they care about.

I don't understand what you're saying here - what is the intended
difference between SOUNDWIRE and SOUNDWIRE_BUS?  Having the separate
option for _INTEL for your controller makes sense but otherwise the
normal pattern for a bus would be that you'd have the root config
option for the bus (which would enable the core code for the bus) and
then everything else is hidden behind that.

> 
> SOUNDWIRE_BUS is really the lowest-common denominator that will be used by
> all drivers at the end.
> 
> > regarding REGMAP_SOUNDWIRE, It should be selected by the codec/soundwire
> > slave drivers isn't it?
> 
> yes, that was the intent.
> Thanks
> -Pierre

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