linux-kernel - Re: [PATCH v3 3/6] pinctrl: Make PINCTRL selectable by defconfig/menuconfig

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Message-ID: <20131217001842.GB3840@sonymobile.com>
Date:	Mon, 16 Dec 2013 16:18:43 -0800
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Christian Daudt <bcm@...thebug.org>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Heiko St?bner <heiko@...ech.de>,
	Pawel Moll <pawel.moll@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Sherman Yin <syin@...adcom.com>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
	Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...aro.org>,
	Matt Porter <matt.porter@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 3/6] pinctrl: Make PINCTRL selectable by
 defconfig/menuconfig

On Mon 16 Dec 02:01 PST 2013, Linus Walleij wrote:

> On Thu, Dec 12, 2013 at 10:35 PM, Christian Daudt <bcm@...thebug.org> wrote:
> 
> >  I had requested this from Sherman. The reason is so that pinctrl can
> > be selectable through defconfig, instead of through SoC select
> > statements. And the reason for that is so that, in the future, some of
> > these can be switched into loadable modules (which can't be done from
> > Kconfig). This will become necessary with the move to multiplatform -
> > we won't be able to have everything static anymore.
> 
> Isn't it sufficient to make the pin controller entry tristate rather
> than bool?
> 
> And as mentioned elsewhere this does not at all solve the issue
> that we still need to have all basic IRQchips and timer drivers
> compiled into the kernel.

No matter how we build the individual pinctrl drivers we will always
need the pinctrl framework in a multi-soc zImage; so I can't see that
we gain anything from being able to compile PINCTRL as a module.

I don't like compiling the individual pinctrl drivers as modules, as
it leaves us with a waterfall of PROBE_DEFERRs.

Regards,
Bjorn

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