linux-kernel - Re: [PATCH] gpiolib/arches: Centralise bolierplate asm/gpio.h

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Message-ID: <20120206113720.GG3070@opensource.wolfsonmicro.com>
Date:	Mon, 6 Feb 2012 11:37:20 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Sam Ravnborg <sam@...nborg.org>, Guan Xuetao <gxt@...c.pku.edu.cn>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Mike Frysinger <vapier@...too.org>,
	Haavard Skinnemoen <hskinnemoen@...il.com>,
	Hans-Christian Egtvedt <egtvedt@...fundet.no>,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-arch@...r.kernel.org, linux-mips@...ux-mips.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH] gpiolib/arches: Centralise bolierplate asm/gpio.h

On Sat, Feb 04, 2012 at 05:41:15PM +0000, Russell King - ARM Linux wrote:

> What's platform specific about asm/gpio.h is the number of GPIOs in
> the system, and whether it wants to intercept the gpio_xxx() functions
> to provide fast access to on-chip GPIOs.

Plus the fact that it might be a completely non-standard API, and might
totally override the gpiolib implementation.

> What I'd suggest is moving asm-generic/gpio.h to linux/gpiolib.h, and
> making asm-generic/gpio.h include that as a patch until stuff is fixed
> for its new location.  That should result in a proper asm-generic/gpio.h
> being:

> Alternatively, instead of linux/gpiolib.h, put it in linux/gpio.h instead,
> but that gets more icky because of the mess of asm/gpio.h includes (which
> I've been banging on for years about in ARM patches and they're _still_
> coming.)

Yeah, though it is a bit neater if it's all in gpio.h and everyone is
using gpiolib.  Perhaps something like the warnings I added on inclusion
of asm/gpio.h without linux/gpio.h would help, though I certainly
wouldn't expect it to solve anything.

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