linux-kernel - Re: [PATCH v2 1/2] gpio: Add driver for Zynq GPIO controller

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Date:	Fri, 11 Jul 2014 09:28:11 +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 Linus,

On Tue, Jul 08, 2014 at 11:27:57AM +0200, Linus Walleij wrote:
> On Mon, Jul 7, 2014 at 5:23 PM, Baruch Siach <baruch@...s.co.il> wrote:
> > On Mon, Jul 07, 2014 at 04:51:56PM +0200, Linus Walleij wrote:
> 
> >> 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,
> 
> I would be happy to carry it in the unstable-ABI debugfs for sure.
> It's the supported ABI that bothers me.
> 
> > and for boot
> > time scripting (mainly in initramfs).
> 
> What is the usecase here?

During boot I need to know, for example, when an FPGA is ready to be 
programmed, and when said FPGA has finished its initialization. I also read 
the sate of on-board DIP switches to determine the desired boot method. I find 
the current sysfs interface quite convenient for these and similar tasks.

baruch

-- 
     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
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