linux-kernel - Re: [PATCH 2/2 v2] serial: Add support for Fintek F81216A LPC to 4 UART

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Date:	Tue, 5 Aug 2014 10:34:09 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, Alan Cox <alan@...ux.intel.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Murali Karicheri <m-karicheri2@...com>,
	Jingoo Han <jg1.han@...sung.com>,
	Michael Welling <mwelling@...e.org>,
	Peter Hurley <peter@...leysoftware.com>,
	Joe Schultz <jschultz@...-inc.com>,
	Ingo Molnar <mingo@...e.hu>,
	Doug Anderson <dianders@...omium.org>,
	linux-serial@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2 v2] serial: Add support for Fintek F81216A LPC to 4
 UART

On Fri, 1 Aug 2014 14:28:11 +0200
Ricardo Ribalda Delgado <ricardo.ribalda@...il.com> wrote:

> Hello
> 
> >> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
> >
> > This half of things looks good to me.
> 
> 
> Thanks!, What about the other half? Would you accept a two step approach?
> 
> 1st: add support for 8250_core
> 2nd: handle rs485 ioctl on serial_core and modify all the other
> drivers to use that? (to avoid code duplication)

We really want to handle it at the tty layer I think not at serial_core.
I have a patch for that and I'm playing with it but it's taking longer
than I hoped.

In the mean time I think your patch #1 is ok except for the trivial
item that I'd prefer the struct serial_rs485 was further down the struct
uart_8250_port. It's packed so that the bits you need most are in the
first cache line or two.

Alan
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