linux-kernel - Re: [PATCH] RFC: WIP: sc16is7xx [v0.4]

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Date:	Mon, 10 Mar 2014 07:50:12 -0400 (EDT)
From:	Jon Ringle <jon@...gle.org>
To:	Alexander Shiyan <shc_work@...l.ru>
cc:	jon@...gle.org, gregkh@...uxfoundation.org, jslaby@...e.cz,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Jon Ringle <jringle@...dpoint.com>
Subject: Re: [PATCH] RFC: WIP: sc16is7xx [v0.4]


On Mon, 10 Mar 2014, Alexander Shiyan wrote:

> Понедельник, 10 марта 2014, 2:26 -04:00 от jon@...gle.org:
> > From: Jon Ringle <jringle@...dpoint.com>
> ...
> > +config SERIAL_SC16IS7XX
> > +	tristate "SC16IS7xx RS485 serial support"
> > +	  select SERIAL_CORE
> > +	  default n
> > +	  help
> > +	  This selects support for SC16IS7xx for use as a RS485 serial port
> 
> Documentation says:
> The SC16IS740/750/760 is a slave I²C-bus/SPI interface to a single-channel
> high performance UART.
> ...
> The SC16IS740/750/760 also provides additional advanced features such
> as auto hardware and software flow control, automatic RS-485 support...
> 
> So why do you position this chip as RS485 only? Automatic direction for
> RS485 is just a feature as an addition for standart UART.

You're right. This is just how we are using the chip in our board. Would a 
configuration flag in platform_data make sense to use the auto rs485 
direction?

Any thoughts as to the latency issue I report?

Thanks.

Regards,
Jon