Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756619AbaGCOIa (ORCPT ); Thu, 3 Jul 2014 10:08:30 -0400 Received: from comal.ext.ti.com ([198.47.26.152]:57909 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755079AbaGCOI1 (ORCPT ); Thu, 3 Jul 2014 10:08:27 -0400 Date: Thu, 3 Jul 2014 09:07:36 -0500 From: Felipe Balbi To: Robert Nelson CC: Felipe Balbi , Tony Lindgren , Aaro Koskinen , Sebastian Andrzej Siewior , linux kernel , , Linux OMAP Mailing List , Linux ARM Kernel Mailing List Subject: Re: [RFC PATCH] tty: serial: Add 8250-core based omap driver Message-ID: <20140703140736.GF5814@saruman.home> Reply-To: References: <1404316809-20637-1-git-send-email-bigeasy@linutronix.de> <20140702160932.GF5541@saruman.home> <20140702190944.GA567@drone.musicnaut.iki.fi> <20140703073411.GX28884@atomide.com> <20140703132509.GA5814@saruman.home> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Y/WcH0a6A93yCHGr" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --Y/WcH0a6A93yCHGr Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jul 03, 2014 at 08:34:44AM -0500, Robert Nelson wrote: > On Thu, Jul 3, 2014 at 8:25 AM, Felipe Balbi wrote: > > On Thu, Jul 03, 2014 at 12:34:11AM -0700, Tony Lindgren wrote: > >> * Robert Nelson [140702 12:27]: > >> > On Wed, Jul 2, 2014 at 2:09 PM, Aaro Koskinen = wrote: > >> > > Hi, > >> > > > >> > > On Wed, Jul 02, 2014 at 11:09:32AM -0500, Felipe Balbi wrote: > >> > >> > It has been only tested as console UART. > >> > >> > The tty name is ttyS based instead of ttyO. How big is the pain= here, > >> > >> > what could be the easiest way to provide compatibility? > >> > >> > >> > >> have been considering that myself for months. You could pass an o= ptional > >> > >> argument to serial8250_register_8250_port() but that only solves = part of > >> > >> the problem :-( > >> > >> Some kind of compability layer sure would be nice. > >> > >> > > When ttyS -> ttyO change was done on OMAP, compatibility was not a= n issue. > >> > > Why should we care about it now? > >> > > >> > It would be a good opportunity to force everyone to update their boo= tloader. ;) > >> > > >> > Besides the BeagleBoard forum is quiet now, no one is complaining > >> > about that old (ttyS -> ttyO) transition anymore.. > >> > >> How about a Kconfig option to provide ttyO by default? The not even > >> do that if kernel has cmdline option nottyomap. > > > > what about single zImage ? I don't want to use ttyO on my > > Allwinner/Exynos/Snapdragon/whatever SoC just because OMAP is in the > > same image ;-) >=20 > What if we just kept it simple, leave the ttyO driver enabled and add > a warning (pr_info) that it's deprecated. It's not like it's broken, > it just won't get later features or devices support added. Fine by me, I'd switch to 8250 as soon as it's merged though :-) would be nice to get an example DTS change just so I can start testing on the boards I have around. --=20 balbi --Y/WcH0a6A93yCHGr Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJTtWOoAAoJEIaOsuA1yqREQmkQAKTtW2FusWULZTfVRTngk906 z11o+d8+ryjq4kod+GZ3xuYkk/JsS51+B+g0Sr+yDTZ+ol2zf9/ikq2FaCrb5vwL eMrvADZ63tgQcbHjQFdfmdlzYew05p4AwOubFCH7wG0fXCMVNnt6xQx/N7fxsK/7 Z08oI4J57payqOA0KE8Yz4vKQXRIUzf+8KjR6SPMHlYF908Hz9tnRVhadU9361AC JBQLJgScJgp3afR+ZrHOIIKsfxHqW1byZoFJwJfc+7t6WP6TuRpC1Ckwr7CKljmb Oih49AWGhfR9gmW9faz3XWugDo0RKncIedpvw2wyk0otgTtxsMIjO6MA/fv01++5 HHbpY9PMMfGaR7dXljAnV/hYCz4oXj9NkMsORuReCufT8QwPlKdPGDo9Ja4AAD6t MYBbsRuPoaEewYVA5PgNBNT2HbUjyf7GXk/fzq/4CTkTXaiAL0TY1xtJKoOQK0X7 Ogmtmrg8z3omQOVwuydk8X4rQNA2hFTg1AejUEom7kIz+gaio3oLNBoUW+MRtSQ5 ZL/oYlX5pLeolLQvb/c6tLpisG9LBz8yTN+myDMsWKMSGcsC6Zy2hMg0wAuEUpzX YCl5VlQmD+WU7hRYLziVZjsjLs7YEo5deykCmp0R2uCYYi23rfeJVoMAchzXYqNF OpbtXHr08qKLULkNA6EA =WqE6 -----END PGP SIGNATURE----- --Y/WcH0a6A93yCHGr-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/