linux-kernel - Re: [PATCH v2 18/24] serdev: ttydev: Serdev driver that creates an standard TTY port

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Message-ID: <CAL_JsqLhRSbhmpaiqgG_TRRXQEsRKG5UK0HWw0tu9Eymn8cNcA@mail.gmail.com>
Date:   Tue, 12 Jun 2018 19:20:03 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v2 18/24] serdev: ttydev: Serdev driver that creates an
 standard TTY port

On Mon, Jun 11, 2018 at 5:52 AM, Ricardo Ribalda Delgado
<ricardo.ribalda@...il.com> wrote:
> Standard TTY port that can be loaded/unloaded via serdev sysfs. This
> serdev driver can only be used by serdev controllers that are compatible
> with ttyport.

I'm hesitant to expose a tty device on top of serdev to userspace that
we then have to support forever unless that's the only way tty devices
(for serial ports) are created.

I did a similar patch which just registered both serdev and a tty
allowing them to coexist. It suffered from warnings about open counts
though and felt hacky.

Rob