linux-kernel - Re: [PATCH 8/9] serdev: add a tty port controller driver

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Date:   Fri, 13 Jan 2017 09:28:07 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Jiri Slaby <jslaby@...e.com>,
        Sebastian Reichel <sre@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Dr . H . Nikolaus Schaller" <hns@...delico.com>,
        Peter Hurley <peter@...leysoftware.com>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Loic Poulain <loic.poulain@...el.com>,
        Pavel Machek <pavel@....cz>, NeilBrown <neil@...wn.name>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/9] serdev: add a tty port controller driver

On Fri, Jan 13, 2017 at 9:04 AM, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
> On Thu, 2017-01-12 at 10:01 -0600, Rob Herring wrote:
>> On Sat, Jan 7, 2017 at 8:11 AM, Andy Shevchenko
>> <andriy.shevchenko@...ux.intel.com> wrote:
>> > On Fri, 2017-01-06 at 10:26 -0600, Rob Herring wrote:
>> > > Add a serdev controller driver for tty ports.
>> > >
>> > > The controller is registered with serdev when tty ports are
>> > > registered
>> > > with the TTY core. As the TTY core is built-in only, this has the
>> > > side
>> > > effect of making serdev built-in as well.
>> > >
>> > >
>> > > +if SERIAL_DEV_BUS
>> > > +
>> > > +config SERIAL_DEV_CTRL_TTYPORT
>> > > +     bool "Serial device TTY port controller"
>> > > +     depends on TTY
>> > > +     depends on SERIAL_DEV_BUS=y
>> >
>> > Do you need one?
>>
>> Yes, otherwise the bus can be built as a module and this driver can
>> still be enabled breaking the build. I could drop supporting building
>> the bus as a module because as long as this is the only controller
>> driver, it all has to be built-in.
>
> Would
>
> if SERIAL_DEV_BUS=y
>
> work for you?

Yes, until we add a driver that doesn't have to be built-in. What
about "depends on SERIAL_DEV_BUS != m"? That would be a bit more clear
what the reason is.

Rob