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

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Date:	Mon, 14 Nov 2011 09:22:18 +0100
From:	Claudio Scordino <claudio@...dence.eu.com>
To:	Wolfram Sang <w.sang@...gutronix.de>
CC:	Greg KH <greg@...ah.com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Nicolas Ferre <nicolas.ferre@...el.com>, alan@...ux.intel.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>,
	Darron Black <darron@...ffin.net>
Subject: Re: [PATCH] RS485: fix inconsistencies in the meaning of some variables

Il 13/11/2011 22:53, Wolfram Sang ha scritto:
> Hi,
> 
> I have been working on a patch series which adds hardware RS485 to the 8250
> according to the latest developments. The series will be posted tomorrow after
> some more tests. However, there is one thing I wondered about:
> 
>>  From now on, SER_RS485_RTS_AFTER_SEND and SER_RS485_RTS_ON_SEND will be used to
>> set the voltage of the RTS pin (as in the crisv10.c driver); the delay will be
>> understood by looking only at the value of delay_rts_before_send and
>> delay_rts_after_send.
> 
> Do I overlook something or is SER_RS485_RTS_AFTER_SEND always the inverted
> signal of SER_RS485_RTS_ON_SEND. So why do we need both? (BTW
> SER_RS485_RTS_ON_SEND is a non-obvious name, I think. But changing it will
> probably break even more users?)

I think so, but I'm not sure since the original version of the Cris driver (prior than the
RS485 data structure) contained both values: a value for RTS during send and a value
for RTS after sent. That's why both vales have been reported inside the RS485 data structure...

Best regards,

	Claudio
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