From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthias Fuchs Subject: Re: [PATCH/RFC] serial: Add ioctl to enable auto rs485 mode with some Exar UARTs Date: Fri, 2 Jan 2009 16:29:37 +0100 Message-ID: <200901021629.38459.mfuchs@ma-fu.de> References: <200812190048.35249.mfuchs@ma-fu.de> <200812221902.27752.mfuchs@ma-fu.de> <1230038587.17555.68.camel@thetriton.toftronix.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-in-17.arcor-online.net ([151.189.21.57]:47472 "EHLO mail-in-17.arcor-online.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751141AbZABP3q (ORCPT ); Fri, 2 Jan 2009 10:29:46 -0500 In-Reply-To: <1230038587.17555.68.camel@thetriton.toftronix.com.au> Content-Disposition: inline Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: Christopher Gibson Cc: linux-serial@vger.kernel.org, Laurent Pinchart Hi Christopher, I checked all your referenced threads. Here is my summary: 1) RS485 seems to be an issue for several people. 2) enabling hardware RS485 via ioct is never totally dismissed. 3) Discussion about software direction control will never end. So I suggest not to mix hardware and software direction control as the same issue. When the hardware supports direction control we should implement it as ioctl. Even this sounds a little bit egoistic, it might bring us a little forward. I will update my initial patch and consider Laurent's comments. Matthias > Recent discussions on RS485 auto direction control seem to be split over > a number of threads. > > Here are the threads that I'm aware of: > http://marc.info/?t=121805745200001&r=1&w=2 > http://marc.info/?t=121690034200007&r=1&w=2 > http://marc.info/?t=122821576400003&r=1&w=2 > http://marc.info/?t=122822457300004&r=1&w=2 > http://marc.info/?t=122954923400001&r=1&w=2 > http://marc.info/?t=122964426200001&r=1&w=2 > http://marc.info/?t=121566595900001&r=1&w=2 > http://marc.info/?t=121805198200004&r=1&w=2 >