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From: David Brownell <david-b@pacbell.net>
To: Jani Nikula <ext-jani.1.nikula@nokia.com>
Subject: Re: [PATCH v2] gpiolib: allow poll(2) on gpio value
Date: Thu, 2 Jul 2009 15:16:17 -0700
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Cc: Daniel =?iso-8859-1?q?Gl=F6ckner?= <dg@emlix.com>,
       Ben Nizette <bn@niasdigital.com>, linux-kernel@vger.kernel.org
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On Thursday 02 July 2009, Jani Nikula wrote:
> I'm trying to say that if you call gpio_export() to create a sysfs
> node, a subsequent poll() in user space won't work because there is no
> irq set up, and sysfs_notify_dirent() won't be called. The patch
> doesn't provide an interface for setting that up from kernel after
> gpio_export() call - it's only possible to set up edge triggering and
> sysfs notify by writing to the "edge" node from user space.

OK, now I understand.  :)

Yeah, that seems fixable in followups.
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