linux-kernel - Re: [PATCH 0/8] serial: 8250: Add 485 emulation to 8250

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Date:   Mon, 4 Jun 2018 13:34:17 +0300
From:   "Matwey V. Kornilov" <matwey@....msu.ru>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Giulio Benetti <giulio.benetti@...ronovasrl.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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 0/8] serial: 8250: Add 485 emulation to 8250_dw.

2018-06-04 13:12 GMT+03:00 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>:
> On Fri, 2018-06-01 at 14:40 +0200, Giulio Benetti wrote:
>> Need to handle rs485 with 8250_dw port.
>>
>> Use existing em485 emulation layer for 8250 taking care to fix some
>> bug
>> and taking care especially of RTS_AFTER_SEND case.
>>
>
> I don't see in Cc list author of rs485 code, who might be interested in
> this.
>
> So, added him here.
>

Hi, Andy

Nice to see you there. I will look through the code later.
I always thought that DW has its own hardware rs485 support.

>> Giulio Benetti (8):
>>   serial: 8250_dw: add em485 support
>>   serial: 8250_dw: allow enable rs485 at boot time
>>   serial: 8250: Copy em485 from port to real port.
>>   serial: 8250: Handle case port doesn't have TEMT interrupt using
>>     em485.
>>   serial: 8250_dw: treat rpm suspend with -EBUSY if RS485 ON and
>>     RTS_AFTER_SEND
>>   serial: 8250: Copy mctrl when register port.
>>   serial: 8250: Make em485_rts_after_send() set mctrl according to rts
>>     state.
>>   serial: core: Mask mctrl with TIOCM_RTS too if rs485 on and
>>     RTS_AFTER_SEND set.
>>
>>  drivers/tty/serial/8250/8250.h      |  2 +-
>>  drivers/tty/serial/8250/8250_core.c |  2 ++
>>  drivers/tty/serial/8250/8250_dw.c   | 41
>> ++++++++++++++++++++++++++++-
>>  drivers/tty/serial/8250/8250_omap.c |  2 +-
>>  drivers/tty/serial/8250/8250_port.c | 33 ++++++++++++++++-------
>>  drivers/tty/serial/serial_core.c    | 12 ++++++++-
>>  include/linux/serial_8250.h         |  1 +
>>  7 files changed, 79 insertions(+), 14 deletions(-)
>>
>
> --
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Intel Finland Oy
>



-- 
With best regards,
Matwey V. Kornilov.
Sternberg Astronomical Institute, Lomonosov Moscow State University, Russia
119234, Moscow, Universitetsky pr-k 13, +7 (495) 9392382