[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Mon, 7 Jul 2014 18:23:09 +0300
From: Baruch Siach <baruch@...s.co.il>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Sören Brinkmann <soren.brinkmann@...inx.com>,
Mark Rutland <mark.rutland@....com>,
Alexandre Courbot <gnurou@...il.com>,
Harini Katakam <harinik@...inx.com>,
Pawel Moll <pawel.moll@....com>,
"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
Michal Simek <michal.simek@...inx.com>,
Harini Katakam <harinikatakamlinux@...il.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Rob Herring <robh+dt@...nel.org>,
Rob Landley <rob@...dley.net>,
Kumar Gala <galak@...eaurora.org>,
Grant Likely <grant.likely@...aro.org>,
Harini Katakam <harini.katakam@...inx.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/2] gpio: Add driver for Zynq GPIO controller
Hi Linux,
On Mon, Jul 07, 2014 at 04:51:56PM +0200, Linus Walleij wrote:
> On Wed, Jun 18, 2014 at 5:36 PM, Sören Brinkmann <soren.brinkmann@...inx.com> wrote:
> > The first is, how is userspace supposed to find the correct offset for a
> > GPIO pin.
>
> The sysfs interface to GPIO is *NOT* *GOOD* this is universally
> agreed upon.
>
> This needs someone to step in and provide a replacement, my preferred
> mechanism would be a /dev/gpiochip0/... hierarchy using char devices.
I really like the ability to control GPIOs from shell, both interactively and
scripted. I find it useful for quick hardware level debugging, and for boot
time scripting (mainly in initramfs). Do you intend to preserve this
capability in the future? Will I need a special utility (or Busybox applet) to
do this with char device ioctl?
baruch
--
http://baruch.siach.name/blog/ ~. .~ Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
- baruch@...s.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists