linux-kernel - Re: [RFC PATCH] tty: serial: Add 8250-core based omap driver

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Message-ID: <20140703132509.GA5814@saruman.home>
Date:	Thu, 3 Jul 2014 08:25:09 -0500
From:	Felipe Balbi <balbi@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	Robert Nelson <robertcnelson@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Felipe Balbi <balbi@...com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux kernel <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH] tty: serial: Add 8250-core based omap driver

On Thu, Jul 03, 2014 at 12:34:11AM -0700, Tony Lindgren wrote:
> * Robert Nelson <robertcnelson@...il.com> [140702 12:27]:
> > On Wed, Jul 2, 2014 at 2:09 PM, Aaro Koskinen <aaro.koskinen@....fi> wrote:
> > > Hi,
> > >
> > > On Wed, Jul 02, 2014 at 11:09:32AM -0500, Felipe Balbi wrote:
> > >> > It has been only tested as console UART.
> > >> > The tty name is ttyS based instead of ttyO. How big is the pain here,
> > >> > what could be the easiest way to provide compatibility?
> > >>
> > >> have been considering that myself for months. You could pass an optional
> > >> argument to serial8250_register_8250_port() but that only solves part of
> > >> the problem :-(
> 
> Some kind of compability layer sure would be nice.
> 
> > > When ttyS -> ttyO change was done on OMAP, compatibility was not an issue.
> > > Why should we care about it now?
> > 
> > It would be a good opportunity to force everyone to update their bootloader. ;)
> > 
> > Besides the BeagleBoard forum is quiet now, no one is complaining
> > about that old (ttyS -> ttyO) transition anymore..
> 
> How about a Kconfig option to provide ttyO by default? The not even
> do that if kernel has cmdline option nottyomap.

what about single zImage ? I don't want to use ttyO on my
Allwinner/Exynos/Snapdragon/whatever SoC just because OMAP is in the
same image ;-)

-- 
balbi

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