Re: [PATCH 2/2] tty: serial: bcm63xx: Allow device nodes to be renamed to /dev/ttyBCM*

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On Mon, Nov 10, 2014 at 11:22 AM, Rob Herring <robh@xxxxxxxxxx> wrote:
>>> This can be solved with a udev rule to create sym links.
>>
>> Is it safe to register two console drivers named "ttyS" with the same
>> major/minor numbers?  Maybe there is a trick to making them coexist?
>
> No, but I think you can do dynamic minor numbers. I seem to recall
> this coming up with the Samsung UARTs a while back.

The other variations I've seen in the tree are:

nwpserial: ttySQ, major 4 minor 68 (not 64)

sunhv, sunsab, sunsu, sunzilog: set uart_driver->major to 4 but let
uart_driver->minor default to 0

SERIAL_ATMEL_TTYAT: compile-time selectable between ttySn (4/64) and
ttyATn (204/154).  txx9 does something similar using
SERIAL_TXX9_STDSERIAL.

A whole bunch of other SoC serial drivers use major 204 and a custom
name like "ttyAL".  Some of these show up in
Documentation/devices.txt; others don't.  ~3 drivers use 204/64 from
the middle of the Altix assigned range.

What is the current best practice for new drivers?
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