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

Robert Nelson robertcnelson at gmail.com
Fri Jul 4 09:57:40 PDT 2014

On Fri, Jul 4, 2014 at 11:51 AM, Sebastian Andrzej Siewior
<bigeasy at linutronix.de> wrote:
> On 07/03/2014 09:34 AM, Tony Lindgren wrote:
>> Heh. Just to summarize the reason ttyO needs to be a separate name
>> and device entry from ttyS is because we also have external 8250
>> devices on GPMC and hotplug busses.
> So the GPMC devices will first get a higher minor/device number. The
> internal serial ports should show up first. I don't see the problem
> (yet).
> If you need a separate major number (and name) like we do have it now
> (between ttySx and ttyOx) then one of requirements would be to tell
> Kconfig that one driver can be active at a time.
> For me the ttyS vs ttyO thing is purely cosmetic. I personally don't
> like that it is different on different platforms like ttymxc, ttySC,
> ttyTHS, …

Maybe it's time to migrate them all to one name? (ttyS)  Does the end
user really care if they have a soc with an omap/imx serial port
driver? Or do they just want to access /dev/ttySx and connect to their


Robert Nelson

More information about the linux-arm-kernel mailing list