From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felipe Balbi Subject: Re: PCF857x and 16-bit GPIO expanders Date: Thu, 19 Sep 2013 07:44:57 -0500 Message-ID: <20130919124457.GB26101@radagast> References: <20130917190732.GD15645@radagast> <2356541.62QktiIBr5@avalon> <20130918173636.GT21559@radagast> <523AB235.1000808@ti.com> Reply-To: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="2B/JsCI69OhZNC5r" Return-path: Content-Disposition: inline In-Reply-To: <523AB235.1000808@ti.com> Sender: linux-gpio-owner@vger.kernel.org To: George Cherian Cc: balbi@ti.com, 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 --2B/JsCI69OhZNC5r Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, On Thu, Sep 19, 2013 at 01:43:41PM +0530, George Cherian wrote: > 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 a= s 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)? 0x21 IIRC, it's pin 15 on that goes to a discrete mux. I want to toggle the mux ;-) --=20 balbi --2B/JsCI69OhZNC5r Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJSOvHIAAoJEIaOsuA1yqREHAcP/0wD7i2/nHKvkGCE/Vin+zpF w7sNneqGPgKpf6pZyUIxjDkmVZIeAvgiQcNpn2xzeOIdBXZbDKtmpnT2x7cuwl/j 3ViPvRNb05ci0VBWgydy4xalGBoL7YPxuW6EELvBfnfWSuEKOfmxDnJovsRlIb0E ixqZhVVTOeJb+XzyzV5BivfHii/kHbq0r7lCqqjQK6qi9U4bHhwT2Oltk3BgLiAA Zy/y4/rVyT7gJKEDstQmkB4S/w8YTDDrMX4rx2esYViQMipiZbah0V8Mdnt3q75T 5qAueB2O6c6g68IW8l7y9OkFtJkdi7NaDN37NdNSa3wHKKHGyEgK5x8XsMSJtuYE Ma0r+oXN83Ymb513Yzdybe+Ln+7JYia6iUrsZue7R7tG34d/Y1v/xCUVAB4xfCcS 45AiRgrwDpVwWa+XVgCHxrQIf5JQz3kn55f+5lj0yNWvJ2mY4ENlx7jqAYPxNRqv uswNo09AAoeuNQYH5BhjyweAtr4mrko1CwCEl1OS1htnuh3WlglEA6IHohlcDsdt 3QLBF/Hfmj8ilu36Qr7Vqvlu7izbXc7CUtsm45kIgal7aQVfa79XsTYE4PAmZrVS pziiEk9Ya28apy2RmNT2BGCKTSbdWOLDR/TSFBfs86SjU8kjNyeSn3jKuR1iwMGC AdwoXjP7BYt8Yz1u2lpR =BBA6 -----END PGP SIGNATURE----- --2B/JsCI69OhZNC5r--