linux-kernel - Re: [alsa-devel] [PATCH 1/2] regmap: soundwire: fix Kconfig select/depend issue

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Date:   Sun, 14 Apr 2019 15:50:07 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Mark Brown <broonie@...nel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, liam.r.girdwood@...ux.intel.com,
        jank@...ence.com, joe@...ches.com, srinivas.kandagatla@...aro.org,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [alsa-devel] [PATCH 1/2] regmap: soundwire: fix Kconfig
 select/depend issue

On 12-04-19, 16:21, Takashi Iwai wrote:
> On Fri, 12 Apr 2019 16:18:41 +0200,
> Mark Brown wrote:
> > 
> > On Fri, Apr 12, 2019 at 09:07:41AM -0500, Pierre-Louis Bossart wrote:
> > 
> > >  config CODEC_XYX_SDW
> > > 	 tristate "XYZ SDW Codec"
> > >          depends on SOUNDWIRE
> > >          select REGMAP_SOUNDWIRE
> > 
> > That looks good.
> > 
> > >  config REGMAP_SOUNDWIRE
> > >          select SOUNDWIRE_BUS
> > 
> > > it'd follow the typical pattern seen in sound/soc/codecs/Kconfig:
> > 
> > IIRC the select here won't actually do anything.
> 
> I thought it'd do select SOUNDWIRE_BUS.  The depends-on here would be
> ignored instead.

yeah this all is bit complicated and should not be so. As Srini pointed
out, we have two symbols, SOUNDWIRE as a menuconfig item which enables
the subsystem and then SOUNDWIRE_BUS which compiles in the code.

Unfortunately I dont seem to recall the advantages of this approach so
it might be easier to drop SOUNDWIRE_BUS and then let codecs do select
REGMAP_SOUNDWIRE and depends on SOUNDWIRE

Thanks
-- 
~Vinod