linux-kernel - Re: [RFC PATCH 1/2] serial: core: Move tty and serdev to be children of serial core port device

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Message-ID: <20231024124558.GM34982@atomide.com>
Date:   Tue, 24 Oct 2023 15:45:58 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Rob Herring <robh@...nel.org>, Dhruva Gole <d-gole@...com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        John Ogness <john.ogness@...utronix.de>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        Maximilian Luz <luzmaximilian@...il.com>
Subject: Re: [RFC PATCH 1/2] serial: core: Move tty and serdev to be children
 of serial core port device

* Andy Shevchenko <andriy.shevchenko@...el.com> [231024 12:42]:
> On Tue, Oct 24, 2023 at 03:29:55PM +0300, Tony Lindgren wrote:
> > * Greg Kroah-Hartman <gregkh@...uxfoundation.org> [231024 11:52]:
> > > What does this change the sysfs tree to look like?
> > 
> > On x86 qemu for the ttys:
> > 
> > # find /sys -name tty
> > /sys/class/tty
> > /sys/class/tty/tty
> > /sys/devices/pnp0/00:04/00:04:0/00:04:0.0/tty
> > /sys/devices/platform/serial8250/serial8250:0/serial8250:0.3/tty
> > /sys/devices/platform/serial8250/serial8250:0/serial8250:0.1/tty
> > /sys/devices/platform/serial8250/serial8250:0/serial8250:0.2/tty
> > /sys/devices/virtual/tty
> > /sys/devices/virtual/tty/tty
> 
> I believe the question was how serdev device will move it's location
> in the hierarchy.

If used, a serdev device serial0 will appear instead of the tty in
the same location.

Regards,

Tony