linux-kernel - Re: [PATCH 3/3] gpio: lib-sysfs: Add 'wakeup' attribute

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Message-ID: <CACRpkda14yOtM=sfsiy2vajd-u-+YbkXZAADQLVNurM4TdCDeQ@mail.gmail.com>
Date:	Thu, 4 Sep 2014 18:29:32 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Soren Brinkmann <soren.brinkmann@...inx.com>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	Michal Simek <michal.simek@...inx.com>,
	Harini Katakam <harinik@...inx.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Ezra Savard <ezras@...inx.com>
Subject: Re: [PATCH 3/3] gpio: lib-sysfs: Add 'wakeup' attribute

On Fri, Aug 29, 2014 at 7:58 PM, 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>

While I do see the utility of this patch, any kind of interrupt and
related handling in userspace makes me super-stressed and
nervous.

I need wide consent for this and please post this patch separately
from the zynq-related patches.

Yours,
Linus Walleij
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