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From: Baruch Siach <baruch@tkos.co.il>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: "Sören Brinkmann" <soren.brinkmann@xilinx.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Alexandre Courbot" <gnurou@gmail.com>,
	"Harini Katakam" <harinik@xilinx.com>,
	"Pawel Moll" <pawel.moll@arm.com>,
	"ijc+devicetree@hellion.org.uk" <ijc+devicetree@hellion.org.uk>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"Michal Simek" <michal.simek@xilinx.com>,
	"Harini Katakam" <harinikatakamlinux@gmail.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Rob Landley" <rob@landley.net>,
	"Kumar Gala" <galak@codeaurora.org>,
	"Grant Likely" <grant.likely@linaro.org>,
	"Harini Katakam" <harini.katakam@xilinx.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 1/2] gpio: Add driver for Zynq GPIO controller
Date: Mon, 7 Jul 2014 18:23:09 +0300	[thread overview]
Message-ID: <20140707152309.GH4939@tarshish> (raw)
In-Reply-To: <CACRpkdb1M3-hrSKLKWz21LCJ1sMvsq5E-aqkpmVhy0NwOS5HhA@mail.gmail.com>

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@xilinx.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@tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -
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WARNING: multiple messages have this Message-ID (diff)
From: baruch@tkos.co.il (Baruch Siach)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/2] gpio: Add driver for Zynq GPIO controller
Date: Mon, 7 Jul 2014 18:23:09 +0300	[thread overview]
Message-ID: <20140707152309.GH4939@tarshish> (raw)
In-Reply-To: <CACRpkdb1M3-hrSKLKWz21LCJ1sMvsq5E-aqkpmVhy0NwOS5HhA@mail.gmail.com>

Hi Linux,

On Mon, Jul 07, 2014 at 04:51:56PM +0200, Linus Walleij wrote:
> On Wed, Jun 18, 2014 at 5:36 PM, S?ren Brinkmann <soren.brinkmann@xilinx.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 at tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -

WARNING: multiple messages have this Message-ID (diff)
From: Baruch Siach <baruch@tkos.co.il>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: "Sören Brinkmann" <soren.brinkmann@xilinx.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Alexandre Courbot" <gnurou@gmail.com>,
	"Harini Katakam" <harinik@xilinx.com>,
	"Pawel Moll" <pawel.moll@arm.com>,
	"ijc+devicetree@hellion.org.uk" <ijc+devicetree@hellion.org.uk>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"Michal Simek" <michal.simek@xilinx.com>,
	"Harini Katakam" <harinikatakamlinux@gmail.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Rob Landley" <rob@landley.net>,
	"Kumar Gala" <galak@codeaurora.org>,
	"Grant Likely" <grant.likely@linaro.org>,
	"Harini Katakam" <harini.katakam@xilinx.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 1/2] gpio: Add driver for Zynq GPIO controller
Date: Mon, 7 Jul 2014 18:23:09 +0300	[thread overview]
Message-ID: <20140707152309.GH4939@tarshish> (raw)
In-Reply-To: <CACRpkdb1M3-hrSKLKWz21LCJ1sMvsq5E-aqkpmVhy0NwOS5HhA@mail.gmail.com>

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@xilinx.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@tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -

  reply	other threads:[~2014-07-07 15:23 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-18 11:39 [PATCH v2 1/2] gpio: Add driver for Zynq GPIO controller Harini Katakam
2014-06-18 11:39 ` Harini Katakam
2014-06-18 11:39 ` [PATCH v2 2/2] devicetree: Add Zynq GPIO devicetree bindings documentation Harini Katakam
2014-06-18 11:39   ` Harini Katakam
2014-07-07 14:53   ` Linus Walleij
2014-07-07 14:53     ` Linus Walleij
2014-07-07 17:35     ` Sören Brinkmann
2014-07-07 17:35       ` Sören Brinkmann
     [not found] ` <1403091577-10232-1-git-send-email-harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
2014-06-18 15:36   ` [PATCH v2 1/2] gpio: Add driver for Zynq GPIO controller Sören Brinkmann
2014-06-18 15:36     ` Sören Brinkmann
2014-06-18 15:36     ` Sören Brinkmann
2014-07-07 14:51     ` Linus Walleij
2014-07-07 14:51       ` Linus Walleij
2014-07-07 14:51       ` Linus Walleij
2014-07-07 15:23       ` Baruch Siach [this message]
2014-07-07 15:23         ` Baruch Siach
2014-07-07 15:23         ` Baruch Siach
2014-07-08  9:27         ` Linus Walleij
2014-07-08  9:27           ` Linus Walleij
2014-07-11  6:28           ` Baruch Siach
2014-07-11  6:28             ` Baruch Siach
2014-07-11 12:06             ` Linus Walleij
2014-07-11 12:06               ` Linus Walleij
2014-07-11 12:06               ` Linus Walleij
2014-07-11 12:27               ` Baruch Siach
2014-07-11 12:27                 ` Baruch Siach
2014-07-11 12:38                 ` Linus Walleij
2014-07-11 12:38                   ` Linus Walleij
2014-07-07 16:08       ` Sören Brinkmann
2014-07-07 16:08         ` Sören Brinkmann
2014-07-08  9:34         ` Linus Walleij
2014-07-08  9:34           ` Linus Walleij
2014-07-08 15:55           ` Sören Brinkmann
2014-07-08 15:55             ` Sören Brinkmann
2014-07-10  8:57             ` Linus Walleij
2014-07-10  8:57               ` Linus Walleij
2014-07-07 14:45 ` Linus Walleij
2014-07-07 14:45   ` Linus Walleij
2014-07-07 17:33   ` Sören Brinkmann
2014-07-07 17:33     ` Sören Brinkmann

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