linux-kernel - Re: [PATCH v2] gpio: lib-sysfs: Add 'wakeup' attribute

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Date:	Mon, 27 Oct 2014 10:55:50 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Alexandre Courbot <gnurou@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v2] gpio: lib-sysfs: Add 'wakeup' attribute

On Mon, 2014-10-27 at 05:52PM +0100, Linus Walleij wrote:
> On Tue, Oct 14, 2014 at 1:50 AM, Soren Brinkmann
> <soren.brinkmann@...inx.com> wrote:
> 
> > Add an attribute 'wakeup' to the GPIO sysfs interface which allows
> > marking/unmarking a GPIO as wake IRQ.
> > The file 'wakeup' is created in each exported GPIOs directory, if an IRQ
> > is associated with that GPIO and the irqchip implements set_wake().
> > Writing 'enabled' to that file will enable wake for that GPIO, while
> > writing 'disabled' will disable wake.
> > Reading that file will return either 'disabled' or 'enabled' depening on
> > the currently set flag for the GPIO's IRQ.
> >
> > Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> > Reviewed-by: Alexandre Courbot <acourbot@...dia.com>
> > ---
> > v2:
> >  - fix error path to unlock mutex before return
> 
> As you're adding an ABI, you should be patching
> Documentation/ABI/testing/sysfs-gpio and
> Documentation/gpio/sysfs.txt in this patch.
> 
> While I *HATE* the idea of adding IRQ support to userspace
> for GPIOs, this "just" adds the wakeup capacity, so I guess I'm
> OK with it.
> 
> Provided you add it to the ABI doc...

Thanks. I will add some documentation and sent a new patch.

	Thanks,
	Sören
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