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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/
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