linux-kernel - Re: [PATCH 1/2] serial: 8250: enable SERIAL_MCTRL

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Date:   Mon, 04 Jun 2018 14:49:27 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Giulio Benetti <giulio.benetti@...ronovasrl.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jiri Slaby <jslaby@...e.com>, Kees Cook <keescook@...omium.org>,
        Matthias Brugger <mbrugger@...e.com>,
        Allen Pais <allen.lkml@...il.com>, Sean Young <sean@...s.org>,
        Ed Blake <ed.blake@...drel.com>,
        Stefan Potyra <Stefan.Potyra@...ktrobit.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Joshua Scott <joshua.scott@...iedtelesis.co.nz>,
        Vignesh R <vigneshr@...com>,
        Rolf Evers-Fischer <rolf.evers.fischer@...iv.com>,
        Aaron Sierra <asierra@...-inc.com>,
        Rafael Gago <rafael.gago@...il.com>,
        Joel Stanley <joel@....id.au>,
        Sean Wang <sean.wang@...iatek.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] serial: 8250: enable SERIAL_MCTRL_GPIO by default.

On Fri, 2018-06-01 at 16:11 +0200, Giulio Benetti wrote:
> It can be useful to override 8250 mctrl lines with gpios, for rts on
> rs485 for example, when rts is not mapped correctly to HW RTS pin.
> 
> Enable SERIAL_MCTRL_GPIO by default.
> 

Unfortunately NAK, see 

commit 5db4f7f80d165fc9725f356e99feec409e446baa
Author: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Date:   Tue Aug 16 15:06:54 2016 +0300

    Revert "tty/serial/8250: use mctrl_gpio helpers"

for the details.

I would love to see a solution that will satisfy everyone, though I have
only means to test proposals for now.

> Signed-off-by: Giulio Benetti <giulio.benetti@...ronovasrl.com>
> ---
>  drivers/tty/serial/8250/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/tty/serial/8250/Kconfig
> b/drivers/tty/serial/8250/Kconfig
> index f005eaf8bc57..c7992b94fece 100644
> --- a/drivers/tty/serial/8250/Kconfig
> +++ b/drivers/tty/serial/8250/Kconfig
> @@ -7,6 +7,7 @@ config SERIAL_8250
>  	tristate "8250/16550 and compatible serial support"
>  	depends on !S390
>  	select SERIAL_CORE
> +	select SERIAL_MCTRL_GPIO if GPIOLIB
>  	---help---
>  	  This selects whether you want to include the driver for the
> standard
>  	  serial ports.  The standard answer is Y.  People who might
> say N

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy