[RFC 1/8] serial:st-asc: Add ST ASC driver.

[Nicolas Pitre]

On Wed, 8 May 2013, Arnd Bergmann wrote:

> On Wednesday 08 May 2013, Greg KH wrote:
> > > just mention there is not hardware reason to not use the generic ttySx
> > > in place of ttyAS as we have only one IP that handle serial on this
> > > family of SoC
> > > 
> > > personally I'll switch to ttySx
> > 
> > Great, then you can use the same major/minor range as well, so there's
> > no more objection from me about this :)
> 
> Does that work these days when you have kernel with multiple built-in
> uart drivers?
> 
> I think it would be good if all uarts were using the same name space
> and major/minor numbers, but I think the mess we currently have is
> the result of the tty_register_driver() interface reserving the
> device number range at driver load time, independent of the presence
> of devices.  I would assume that normal distro kernels always ship
> with an 8250 driver built-in to allow using that as the console,
> and if I read the code correctly, that currently prevents another
> uart driver from registering the same major/minor numbers.

I tried to fix this up over 10 years ago.  RMK tried as well. This 
failed because X86 people insisted on always having COM1 as /dev/ttyS0, 
COM3 as /dev/ttyS2 and so on, even when some of them weren't present.

A common and dynamic namespace eventually succeeded for hard disks.
Maybe people are ready to accept it for serial ports as well now?


Nicolas