linux-kernel - Re: [RESEND RFC PATCH 1/2] gpio: Add isr property of gpio pins

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Message-ID: <CACRpkdbQztU14hY60HPv78TjVWVLx6RBzrFQqddVfNv3cj142g@mail.gmail.com>
Date:	Fri, 11 Dec 2015 13:43:31 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Peter Rosin <peda@...ator.liu.se>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Peter Rosin <peda@...ntia.se>
Subject: Re: [RESEND RFC PATCH 1/2] gpio: Add isr property of gpio pins

On Tue, Dec 8, 2015 at 4:20 AM, Peter Rosin <peda@...ator.liu.se> wrote:

> From: Peter Rosin <peda@...ntia.se>
>
> Adds the possibility to read the interrupt status register bit for the
> gpio pin. Expose the bit as an isr file in sysfs.
>
> Signed-off-by: Peter Rosin <peda@...ntia.se>

NACK. We have frozen the sysfs ABI and we are working on a
character device to replace it for userspace access, see:
http://marc.info/?l=linux-gpio&m=144550276512673&w=2

Second question is *WHY* you want this crazy thing? Userspace
should want *events* from a file descriptor, like IIO does it for
example (on top of a proper chardev), not polling a register to
figure out if an IRQ occurred.

We need to think about the real solution to what you want to do.

Yours,
Linus Walleij
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