From: Giulio Benetti <giulio.benetti@micronovasrl.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: "Matwey V. Kornilov" <matwey.kornilov@gmail.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>, Ed Blake <ed.blake@sondrel.com>,
Joshua Scott <joshua.scott@alliedtelesis.co.nz>,
"open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/4] serial: 8250_dw: add em485 support
Date: Wed, 6 Jun 2018 21:16:37 +0200 [thread overview]
Message-ID: <9d8bdd5b-842f-8943-a186-a99f31d71a2a@micronovasrl.com> (raw)
In-Reply-To: <CAHp75VfgYmX5WiG5HpN7hLiW1CfhDYV2gya58OGYyBQwVGTY2A@mail.gmail.com>
Il 06/06/2018 18:51, Andy Shevchenko ha scritto:
> On Wed, Jun 6, 2018 at 12:51 PM, Giulio Benetti
> <giulio.benetti@micronovasrl.com> wrote:
>> Need to use rs485 transceiver so let's use existing em485 485 emulation
>> layer on top of 8250.
>>
>> Add rs485_config callback to port.
>
> Besides the fact the series lacks of cover letter, I think it should
Sorry for that, next patchsets will have cover-letters.
> be postponed until we get a clear understanding how RS485 is supposed
> to be initialized and what exact problems you are trying to address.
>
>>
>> Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
>> ---
>> drivers/tty/serial/8250/8250_dw.c | 31 +++++++++++++++++++++++++++++++
>> 1 file changed, 31 insertions(+)
>>
>> diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
>> index 6fcdb90f616a..45366e6e5411 100644
>> --- a/drivers/tty/serial/8250/8250_dw.c
>> +++ b/drivers/tty/serial/8250/8250_dw.c
>> @@ -314,6 +314,36 @@ static void dw8250_set_ldisc(struct uart_port *p, struct ktermios *termios)
>> serial8250_do_set_ldisc(p, termios);
>> }
>>
>> +static int dw8250_rs485_config(struct uart_port *p,
>> + struct serial_rs485 *rs485)
>> +{
>> + struct uart_8250_port *up = up_to_u8250p(p);
>> +
>> + /* Clamp the delays to [0, 100ms] */
>> + rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
>> + rs485->delay_rts_after_send = min(rs485->delay_rts_after_send, 100U);
>> +
>> + p->rs485 = *rs485;
>> +
>> + /*
>> + * Both serial8250_em485_init and serial8250_em485_destroy
>> + * are idempotent
>> + */
>> + if (rs485->flags & SER_RS485_ENABLED) {
>> + int ret = serial8250_em485_init(up);
>> +
>> + if (ret) {
>> + rs485->flags &= ~SER_RS485_ENABLED;
>> + p->rs485.flags &= ~SER_RS485_ENABLED;
>> + }
>> + return ret;
>> + }
>> +
>> + serial8250_em485_destroy(up);
>> +
>> + return 0;
>> +}
>> +
>> /*
>> * dw8250_fallback_dma_filter will prevent the UART from getting just any free
>> * channel on platforms that have DMA engines, but don't have any channels
>> @@ -449,6 +479,7 @@ static int dw8250_probe(struct platform_device *pdev)
>> p->serial_out = dw8250_serial_out;
>> p->set_ldisc = dw8250_set_ldisc;
>> p->set_termios = dw8250_set_termios;
>> + p->rs485_config = dw8250_rs485_config;
>>
>> p->membase = devm_ioremap(dev, regs->start, resource_size(regs));
>> if (!p->membase)
>> --
>> 2.17.1
>>
>
>
>
--
Giulio Benetti
CTO
MICRONOVA SRL
Sede: Via A. Niedda 3 - 35010 Vigonza (PD)
Tel. 049/8931563 - Fax 049/8931346
Cod.Fiscale - P.IVA 02663420285
Capitale Sociale € 26.000 i.v.
Iscritta al Reg. Imprese di Padova N. 02663420285
Numero R.E.A. 258642
next prev parent reply other threads:[~2018-06-06 19:16 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-01 12:40 [PATCH 0/8] serial: 8250: Add 485 emulation to 8250_dw Giulio Benetti
2018-06-01 12:40 ` [PATCH 1/8] serial: 8250_dw: add em485 support Giulio Benetti
2018-06-01 12:40 ` [PATCH 2/8] serial: 8250_dw: allow enable rs485 at boot time Giulio Benetti
2018-06-01 12:40 ` [PATCH 3/8] serial: 8250: Copy em485 from port to real port Giulio Benetti
2018-06-04 10:13 ` Andy Shevchenko
2018-06-04 10:52 ` Giulio Benetti
2018-06-01 12:40 ` [PATCH 4/8] serial: 8250: Handle case port doesn't have TEMT interrupt using em485 Giulio Benetti
2018-06-04 10:17 ` Andy Shevchenko
2018-06-04 10:50 ` Giulio Benetti
2018-06-04 11:38 ` Andy Shevchenko
2018-06-04 11:50 ` Giulio Benetti
2018-06-04 12:26 ` Andy Shevchenko
2018-06-04 17:40 ` Matwey V. Kornilov
2018-06-04 18:50 ` Giulio Benetti
2018-06-05 10:51 ` Matwey V. Kornilov
2018-06-06 9:36 ` Giulio Benetti
2018-06-06 9:49 ` [PATCH 2/4] serial: 8250: Copy mctrl when register port Giulio Benetti
2018-06-06 9:49 ` [PATCH 3/4] serial: 8250: Make em485_rts_after_send() set mctrl according to rts state Giulio Benetti
2018-06-06 12:02 ` Andy Shevchenko
2018-06-06 9:49 ` [PATCH 4/4] serial: core: Mask mctrl with TIOCM_RTS too if rs485 on and RTS_AFTER_SEND set Giulio Benetti
2018-06-06 12:03 ` Andy Shevchenko
2018-06-06 12:07 ` Giulio Benetti
2018-06-06 9:49 ` [PATCH 1/4] serial: 8250: Copy em485 from port to real port Giulio Benetti
2018-06-06 11:56 ` Andy Shevchenko
2018-06-06 12:15 ` Giulio Benetti
2018-06-06 13:11 ` Andy Shevchenko
2018-06-06 14:32 ` Giulio Benetti
2018-06-06 18:55 ` Matwey V. Kornilov
2018-06-06 19:15 ` Giulio Benetti
2018-06-07 7:03 ` Matwey V. Kornilov
2018-06-07 12:43 ` Giulio Benetti
2018-06-06 12:01 ` [PATCH 2/4] serial: 8250: Copy mctrl when register port Andy Shevchenko
2018-06-06 9:51 ` [PATCH 2/4] serial: 8250_dw: allow enable rs485 at boot time Giulio Benetti
2018-06-06 9:51 ` [PATCH 3/4] serial: 8250: Handle case port doesn't have TEMT interrupt using em485 Giulio Benetti
2018-06-13 16:59 ` Alan Cox
2018-06-06 9:51 ` [PATCH 4/4] serial: 8250_dw: treat rpm suspend with -EBUSY if RS485 ON and RTS_AFTER_SEND Giulio Benetti
2018-06-06 9:51 ` [PATCH 1/4] serial: 8250_dw: add em485 support Giulio Benetti
2018-06-06 16:51 ` Andy Shevchenko
2018-06-06 19:16 ` Giulio Benetti [this message]
2018-06-01 12:40 ` [PATCH 5/8] serial: 8250_dw: treat rpm suspend with -EBUSY if RS485 ON and RTS_AFTER_SEND Giulio Benetti
2018-06-01 12:40 ` [PATCH 6/8] serial: 8250: Copy mctrl when register port Giulio Benetti
2018-06-06 14:31 ` Aaron Sierra
2018-06-06 14:44 ` Giulio Benetti
2018-06-01 12:40 ` [PATCH 7/8] serial: 8250: Make em485_rts_after_send() set mctrl according to rts state Giulio Benetti
2018-06-01 12:40 ` [PATCH 8/8] serial: core: Mask mctrl with TIOCM_RTS too if rs485 on and RTS_AFTER_SEND set Giulio Benetti
2018-06-04 10:12 ` [PATCH 0/8] serial: 8250: Add 485 emulation to 8250_dw Andy Shevchenko
2018-06-04 10:34 ` Matwey V. Kornilov
2018-06-04 10:42 ` Giulio Benetti
2018-06-04 11:44 ` Andy Shevchenko
2018-06-04 14:58 ` Giulio Benetti
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=9d8bdd5b-842f-8943-a186-a99f31d71a2a@micronovasrl.com \
--to=giulio.benetti@micronovasrl.com \
--cc=andriy.shevchenko@linux.intel.com \
--cc=andy.shevchenko@gmail.com \
--cc=ed.blake@sondrel.com \
--cc=gregkh@linuxfoundation.org \
--cc=joshua.scott@alliedtelesis.co.nz \
--cc=jslaby@suse.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=matwey.kornilov@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).