linux-kernel - Re: [PATCH][GPIO] Add IRQ edge setter to gpiolib

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Date:	Fri, 30 Nov 2012 11:30:21 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Drasko DRASKOVIC <drasko.draskovic@...il.com>,
	linux-kernel@...r.kernel.org
Cc:	linus.walleij@...aro.org
Subject: Re: [PATCH][GPIO] Add IRQ edge setter to gpiolib

On Fri, 5 Oct 2012 14:20:55 +0200, Drasko DRASKOVIC <drasko.draskovic@...il.com> wrote:
> Hi all,
> please find a patch that adds IRQ edge set-up mechanism to sysfs that
> can be called from the kernel.
> 
> This functionality can be very useful for embedded systems, as it
> permits kernel to do GPIO set-up during boot stage. Configuration
> which defines pins behavior is often kept in NVRAM, and during boot
> stage these structures can be parsed and executed by the kernel, so
> that when user processes already find all sysfs environment ready and
> correctly set-up.
> 
> While at the present it is possible to export GPIO pins to sysfs (and
> correct direction / value), it is not possible to export IRQ
> configuration as well, so this must be done in user space (most often
> via command line). this patch implements missing functionality, so
> that  gpio_sysfs_set_edge() function can be called directly from the
> kernel.

This really seems like the wrong place to be doing this. If the GPIO
needs to be used with a particular configuration for an IRQ, then the
device tree or platform data on non-dt should be given that information.
I do not feel good about exporting anonymnous IRQ configuration to
userspace.
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