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

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Message-Id: <201312202158.34805.arnd@arndb.de>
Date:	Fri, 20 Dec 2013 21:58:34 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	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 Friday 20 December 2013, Linus Walleij wrote:
> On Tue, Dec 17, 2013 at 1:18 AM, Bjorn Andersson
> <bjorn.andersson@...ymobile.com> wrote:
> 
> > 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 discussed this matter with Christian on IRC and I believe we could
> basically do "select PINCTRL" on ARCH_MULTIPLATFORM as the
> vast majority of multiplatforms appear to be using this anyway, this
> would make the submenu for pin control pop up in menuconfig
> for this, and make it possible to move different subdrivers to modules
> if desired.
> 
> MULTIPLATFORM does not seem to be about saving footprint bytes
> on a very fine-granular level anyway, more about doing the module
> loading/unloading approach to footprint.

Let's review the list of platforms that don't select PINCTRL. There
are some platforms that are indeed sensitive about memory footprint,
and I promised people that converting to multiplatform won't cause
a significant increase in kernel binary size as long as no other
platforms are enabled.

	Arnd
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