From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756806AbdABVHf (ORCPT ); Mon, 2 Jan 2017 16:07:35 -0500 Received: from hydra.openmoko.org ([144.76.72.4]:52165 "EHLO hydra.openmoko.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755596AbdABVGF (ORCPT ); Mon, 2 Jan 2017 16:06:05 -0500 From: joerg Reisenweber To: Pali =?ISO-8859-1?Q?Roh=E1r?= Cc: Aaro Koskinen , Peter Ujfalusi , Jarkko Nikula , Tony Lindgren , Eduardo Valentin , Lars-Peter Clausen , Nishanth Menon , Sebastian Reichel , Pavel Machek , Ivaylo Dimitrov , linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Nokia N900 sound driver and ECI GPIOs Date: Mon, 02 Jan 2017 22:05:39 +0100 Message-ID: <2036063.jAbaHqGlp2@saturn> User-Agent: KMail/4.11.5 (Linux/3.16.6-2-desktop; KDE/4.11.5; x86_64; ; ) In-Reply-To: <201701022101.01341@pali> References: <201701012054.54505@pali> <20170102184945.m6maflaoihumd7nt@raspberrypi-2.musicnaut.iki.fi> <201701022101.01341@pali> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1832580.CVLtlCnN7x"; micalg="pgp-sha1"; protocol="application/pgp-signature" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --nextPart1832580.CVLtlCnN7x Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1" On Mon 02 January 2017 21:01:01 Pali Roh=E1r wrote: > On Monday 02 January 2017 19:49:45 Aaro Koskinen wrote: > > The schematic shows ECI(5:0), but only 3 are connected/used. There > > were 3 other GPIOs reserved but not used in the final product. >=20 > Are you sure that this is truth (maybe you have some information)? Or= > you just looked at schematic and deduced this observation (as other > people too)? >=20 > Joerg already told us that RX51 schematic does not 100% match product= ion > N900 and e.g. there is missing UART3 pins... We found this, see https://irclog.whitequark.org/neo900/2017-01-01 (has= a lot=20 of possibly useful references/links) The question is if pin AA3 aka GPIO_178 is actually NotConnected in N90= 0 or=20 it's just an omission in schematics and there's actually some more 'ste= alth=20 hardware' in N900 that doesn't show up in docs, just like the testpoint= UART=20 console http://wiki.maemo.org/N900_Hardware_Hacking#Debug_ports which a= lso are=20 missing in schematics. > What we know that gpio 178 is *already* controlled and changed by > production Nokia kernel running on production N900 devices (as I wrot= e > in first email). I could use one of the unpopulated N900 PCB and solder a wire to the OM= AP AA3=20 pad, then try to make sure it's not connected to anything, or if it is = then=20 find out about the details of this. But I'm reluctant to do this, since it's an error prone and (in case of= N/C)=20 not verifiable procedure, so I'd appreciate any further info, whether f= rom=20 historical anecdote or from sourcecode review and conclusions, regardin= g that. cheers jOERG =2D-=20 () ascii ribbon campaign /\ =20 against html e-mail - against proprietary attachments http://www.georgedillon.com/web/html_email_is_evil.shtml =20 http://www.nonhtmlmail.org/campaign.html http://www.georgedillon.com/web/html_email_is_evil_still.shtml =20 http://www.gerstbach.at/2004/ascii/ (German) --nextPart1832580.CVLtlCnN7x Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. Content-Transfer-Encoding: 7Bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iEYEABECAAYFAlhqwKgACgkQ7Xtwhpk1UgxMSwCcCTk3YvYaVWQa9oIT8virHtN8 CncAn3xnbNJVhza3tjjfbM5a6vTh83hm =rPJ8 -----END PGP SIGNATURE----- --nextPart1832580.CVLtlCnN7x--