linux-kernel - Re: [PATCH] mfd: Combine MFD_SUPPORT and MFD

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Date:	Fri, 02 Sep 2011 14:54:55 +0300
From:	Luciano Coelho <coelho@...com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Randy Dunlap <rdunlap@...otime.net>, matti.j.aaltonen@...ia.com,
	johannes@...solutions.net, linux-kernel@...r.kernel.org,
	sameo@...ux.intel.com, mchehab@...radead.org,
	linux-media@...r.kernel.org, linux-omap@...r.kernel.org,
	Jean Delvare <khali@...ux-fr.org>,
	Tony Lindgren <tony@...mide.com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH] mfd: Combine MFD_SUPPORT and MFD_CORE

On Wed, 2011-08-31 at 18:49 +0200, Arnd Bergmann wrote: 
> On Monday 29 August 2011, Luciano Coelho wrote:
> > From: Randy Dunlap <rdunlap@...otime.net>
> > 
> > Combine MFD_SUPPORT (which only enabled the remainder of the MFD
> > menu) and MFD_CORE.  This allows other drivers to select MFD_CORE
> > without needing to also select MFD_SUPPORT, which fixes some
> > kconfig unmet dependency warnings.  Modeled after I2C kconfig.
> > 
> > [Forward-ported to 3.1-rc4.  This fixes a warning when some drivers,
> > such as RADIO_WL1273, are selected, but MFD_SUPPORT is not. -- Luca]
> > 
> > Signed-off-by: Randy Dunlap <rdunlap@...otime.net>
> > Reported-by: Johannes Berg <johannes@...solutions.net>
> > Cc: Jean Delvare <khali@...ux-fr.org>
> > Cc: Tony Lindgren <tony@...mide.com>
> > Cc: Grant Likely <grant.likely@...retlab.ca>
> > Signed-off-by: Luciano Coelho <coelho@...com>
> > ---
> > 
> > I guess this should fix the problem.  I've simple forward-ported
> > Randy's patch to the latest mainline kernel.  I don't know via which
> > tree this should go in, though.
> > 
> > NOTE: I have not tested this very thoroughly.  But at least
> > omap2plus stuff seems to work okay with this change.  MFD_SUPPORT is
> > also selected by a couple of "tile" platforms defconfigs, but I guess
> > the Kconfig system should take care of it.
> 
> Doing this is a good idea, but incidentally I have just spent some time
> with the same problem and ended up with a solution that I like better,
> which is removing CONFIG_MFD_SUPPORT altogether.
> 
> The point is that there is no use enabling MFD_CORE if you don't also
> enable any of the specific drivers. MFD_SUPPORT was added as a 'menuconfig'
> before we had Kconfig warn about broken dependencies, so everything was
> fine. Since Kconfig now issues the warnings, I think it would be better
> to just turn the MFD menu into a plain 'menu' and remove all the
> 'depends on MFD_SUPPORT' and 'select MFD_SUPPORT' lines from the other
> Kconfig files.

Yes, this makes sense.  I think your solution is indeed cleaner.  If you
want to send it it's fine with me.  I don't really have any preference,
I just wanted to clean a problem that was reported to me. ;)

If you send your changes, my patch can be ignored, otherwise, I can send
a v2 with the changes Jean proposed.


-- 
Cheers,
Luca.

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