From mboxrd@z Thu Jan 1 00:00:00 1970 From: baruch@tkos.co.il (Baruch Siach) Date: Mon, 7 Jul 2014 18:23:09 +0300 Subject: [PATCH v2 1/2] gpio: Add driver for Zynq GPIO controller In-Reply-To: References: <1403091577-10232-1-git-send-email-harinik@xilinx.com> <5cc8b89b-20ff-4fa9-92dd-bb2f6d3512d8@BY2FFO11FD030.protection.gbl> Message-ID: <20140707152309.GH4939@tarshish> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 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 -