linux-kernel - Re: [GIT PULL] omap changes for v2.6.39 merge window

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Date:	Sat, 2 Apr 2011 03:59:02 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Nicolas Pitre <nico@...xnic.net>
Cc:	Arnd Bergmann <arnd@...db.de>, Detlef Vollmann <dv@...lmann.ch>,
	Ingo Molnar <mingo@...e.hu>, david@...g.hm,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>,
	Catalin Marinas <catalin.marinas@....com>,
	lkml <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	David Brown <davidb@...eaurora.org>,
	linux-omap@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [GIT PULL] omap changes for v2.6.39 merge window

On Fri, Apr 01, 2011 at 03:54:47PM -0400, Nicolas Pitre wrote:

> 1) GPIO drivers

>    As Linus observed, in the majority of the cases GPIOs are accessed 
>    through simple memory-mapped registers.  Some have absolute state 
>    registers, the others have separate clear/set registers.  Suffice to 
>    create two generic GPIO drivers each covering those two common cases, 
>    and those generic drivers would simply register with the higher level 
>    gpiolib code, and all the board code would have to do is to provide 
>    the data for those GPIOs (register offsets, number of GPIOs, etc.).  
>    Whether this data eventually comes from DT is an orthogonal issue.

For this case we actually already have the basic_mmio_gpio driver in
tree, we should be pushing for wider usage of that.
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