Serial: Initial refactor

[Samuel Thibault]

Okash Khawaja, on Fri 18 Nov 2016 07:07:33 +0000, wrote:
> "You will notice calls to spk_serial_out() in spk_do_catch_up() and
> spk_synth_flush(). Actually the very first step of your work could be
> to add a serial_out() method to drivers, which for now would be set
> to spk_serial_out() in all drivers, and make spk_do_catch_up() and
> spk_synth_flush() call the method instead of spk_serial_out(). Direct
> calls to spk_serial_out() within drivers could be converted into calling
> the method too, so that switching methods will be trivial."
> 
> So I am wondering if it will be possible to restrict the changes to
> speakup_dummy while we test the new implementation using tty->ops->write? That
> means a transitional phase where we have both, the existing serial io for other
> drivers and new implementation for dummy driver. Or is that what you meant?

That's what I meant :)

Samuel