linux-kernel - Re: [PATCH] RS485: fix inconsistencies in the meaning of some variables

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Message-ID: <20111114120745.376729c4@bob.linux.org.uk>
Date:	Mon, 14 Nov 2011 12:07:45 +0000
From:	Alan Cox <alan@...ux.intel.com>
To:	Darron Black <darron@...ffin.net>
Cc:	Wolfram Sang <w.sang@...gutronix.de>,
	Claudio Scordino <claudio@...dence.eu.com>,
	Greg KH <greg@...ah.com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Jesper Nilsson <Jesper.Nilsson@...s.com>,
	Mikael Starvik <mikael.starvik@...s.com>
Subject: Re: [PATCH] RS485: fix inconsistencies in the meaning of some
 variables

> 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
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