From mboxrd@z Thu Jan 1 00:00:00 1970 From: George Cherian Subject: Re: PCF857x and 16-bit GPIO expanders Date: Thu, 19 Sep 2013 13:43:41 +0530 Message-ID: <523AB235.1000808@ti.com> References: <20130917190732.GD15645@radagast> <2356541.62QktiIBr5@avalon> <20130918173636.GT21559@radagast> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20130918173636.GT21559@radagast> Sender: linux-gpio-owner@vger.kernel.org To: balbi@ti.com Cc: Laurent Pinchart , Linus Walleij , Laurent Pinchart , Kuninori Morimoto , "linux-gpio@vger.kernel.org" , Linux Kernel Mailing List , Linux OMAP Mailing List List-Id: linux-omap@vger.kernel.org On 9/18/2013 11:06 PM, Felipe Balbi wrote: > Hi, > > On Wed, Sep 18, 2013 at 07:18:04PM +0200, Laurent Pinchart wrote: >> On Wednesday 18 September 2013 13:16:27 Linus Walleij wrote: >>> On Tue, Sep 17, 2013 at 9:07 PM, Felipe Balbi wrote: >>>> has anyone ever successfully using gpio-pcf857x.c driver with 16-bit >>>> gpio expanders ? We're having some issues here where toggling the last >>>> gpio pin (gpio 15) on a PCF8575 device causes platform to hang and I >>>> can't come up with any explanation of why would it hang... >>> Bouncing the question to George, Laurent and Kuninori... >> I've got a board with a PCF8575 chip, but it uses I/Os 8 to 14 only as far as >> I know. >> >> I can try toggling I/O 15, but that will need to wait until next week as I'm >> currently travelling without access to the hardware. > alright, that'd help me a lot :-) Just want to make sure if we're having > a board issue, or PCF8575 is a bit screwy ;-) Is it on dra7x-evm if so which pcf device (i2c address)? The pins i were interested were only 1 and 2 I never tried pin 15. Just tried toggling through sysfs and it works for me. > > Thanks > -- -George