linux-kernel - Re: [MeeGo-Dev][PATCH] Topcliff: Update PCH

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Message-ID: <20100928041217.GA8882@opensource.wolfsonmicro.com>
Date:	Mon, 27 Sep 2010 21:12:18 -0700
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Masayuki Ohtake <masa-korg@....okisemi.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Alek Du <alek.du@...el.com>,
	Richard R.$B‹K.(Bfors 
	<richard.rojfors@...ean-labs.com>,
	Mike Frysinger <vapier@...too.org>, meego-dev@...go.com,
	ML linux-kernel <linux-kernel@...r.kernel.org>,
	"Wang, Qi" <qi.wang@...el.com>, andrew.chih.howe.khor@...el.com,
	gregkh@...e.de, "Wang, Yong Y" <yong.y.wang@...el.com>,
	Tomoya MORINAGA <morinaga526@....okisemi.com>
Subject: Re: [MeeGo-Dev][PATCH] Topcliff: Update PCH_GPIO driver to 2.6.35

On Tue, Sep 28, 2010 at 12:21:10PM +0900, Masayuki Ohtake wrote:

> > You should be implementing support for the device using the
> > standard interfaces used by the other GPIO drivers in kernel.

> I don't understand how userspace accesses to the driver.
> Let me know how to ? sysfs only ?

sysfs, though at least as often another driver in the kernel will
interact with the GPIOs.  Search the kernel for users of the gpiolib
APIs.
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