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

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Message-ID: <CACRpkdYh3bZLodeNYubu_WQ-O=5My0Jt=b3g2GT3Mvy2XZMrLg@mail.gmail.com>
Date:	Mon, 27 Oct 2014 17:52:04 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Soren Brinkmann <soren.brinkmann@...inx.com>
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 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...

Yours,
Linus Walleij
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