From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: Re: [PATCH] RS485: fix inconsistencies in the meaning of some variables Date: Mon, 14 Nov 2011 12:07:45 +0000 Message-ID: <20111114120745.376729c4@bob.linux.org.uk> References: <4E492CFF.7040905@pwrnet.de> <20110822211832.GA8023@kroah.com> <4EB3A009.10502@evidence.eu.com> <4EB8F6B9.6010008@atmel.com> <4EB90902.4030200@evidence.eu.com> <20111108134804.07095c5d@lxorguk.ukuu.org.uk> <20111108142432.GA11293@kroah.com> <4EBA9385.7010806@evidence.eu.com> <20111113215318.GA2966@pengutronix.de> <4EC062B7.2090100@griffin.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from mga09.intel.com ([134.134.136.24]:17424 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750768Ab1KNL4b (ORCPT ); Mon, 14 Nov 2011 06:56:31 -0500 In-Reply-To: <4EC062B7.2090100@griffin.net> Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: Darron Black Cc: Wolfram Sang , Claudio Scordino , Greg KH , Alan Cox , Nicolas Ferre , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jesper Nilsson , Mikael Starvik > Perhaps the RTS toggle after transmit delay needs to be large, and > they'd rather do it in userspace than block in the driver. I also > recall a protocol that would send a master assertion command and hold > on to RTS afterwards. I can easily imagine needing to quickly Appletalk does this for one. Some protocols use it for priming low cpu power receivers. You fire a header message at the target which fits into its serial fifo, it then responds and can sit in a tight loop getting the following frame data. Alan