linux-kernel - Re: [PATCH v1 31/31] serial: 8250_mxpcie: add RS485-2W auto-adjust sysfs control

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Message-ID: <CAHp75VeVxtGCMX0_Bxcq2vEBtWcp+Q340b4egD6xBERqFcna8g@mail.gmail.com>
Date: Wed, 3 Dec 2025 11:28:14 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Crescent Hsieh <crescentcy.hsieh@...a.com>
Cc: gregkh@...uxfoundation.org, jirislaby@...nel.org, 
	ilpo.jarvinen@...ux.intel.com, linux-kernel@...r.kernel.org, 
	linux-serial@...r.kernel.org
Subject: Re: [PATCH v1 31/31] serial: 8250_mxpcie: add RS485-2W auto-adjust
 sysfs control

On Wed, Dec 3, 2025 at 11:24 AM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Wed, Dec 3, 2025 at 4:56 AM Crescent Hsieh <crescentcy.hsieh@...a.com> wrote:
> > On Mon, Dec 01, 2025 at 04:45:58AM +0200, Andy Shevchenko wrote:
> > > On Sun, Nov 30, 2025 at 12:46 PM Crescent Hsieh
> > > <crescentcy.hsieh@...a.com> wrote:

...

> > >  while ABI is being broken,
>
> In case you are wondering what I was talking about in the above, I
> meant move from /dev/ttyMIxx to /dev/ttySxx. This will break all the
> current kernel command lines and hence setups with the explicit
> mention of the /dev/ttyMIxx, such as console=.

FWIW, we used to have in the past more than one case like this, so if
it's well justified and customers are aware of the change, it may go
in.

-- 
With Best Regards,
Andy Shevchenko