From: Giulio Benetti <giulio.benetti@micronovasrl.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Heiko Stuebner <heiko@sntech.de>,
gregkh@linuxfoundation.org, jslaby@suse.com,
matwey.kornilov@gmail.com, lukas@wunner.de,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
christoph.muellner@theobroma-systems.com,
Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Subject: Re: [PATCH v3 5/5] serial: 8250_dw: add em485 support
Date: Fri, 5 Feb 2021 18:46:56 +0100 [thread overview]
Message-ID: <9b2a7c4c-2ef1-5198-9aae-83f9fec00289@micronovasrl.com> (raw)
In-Reply-To: <YBk14xJhIyqTNH/k@smile.fi.intel.com>
Il 02/02/2021 12:22, Andy Shevchenko ha scritto:
> On Tue, Feb 02, 2021 at 01:31:17AM +0100, Giulio Benetti wrote:
>> Il 18/05/2020 17:21, Andy Shevchenko ha scritto:
>>> On Sun, May 17, 2020 at 11:56:10PM +0200, Heiko Stuebner wrote:
>>>> From: Giulio Benetti <giulio.benetti@micronovasrl.com>
>>>>
>>>> Need to use rs485 transceiver so let's use existing em485 485 emulation
>>>> layer on top of 8250.
>>>>
>>>> Add rs485_config callback to port and uses the standard em485 start and
>>>> stop helpers.
>>>
>>> Would it prevent to use native RS485 support?
>>
>> 8250_dw doesn't have a native RS485 support, do you mean using hardware
>> RTS assertion? Anyway at the moment it's not present. This would be the
>> first rs485 support added to 8250_dw.
>
> DW v4.0+ has it.
I have access to datasheet of DW v3, and I don't have access to hardware
with DW v4.0v Uart.
But I could add rs485emu for only UART version < 4.0 and I can find Uart
version by reading UCV register, would it be acceptable?
Best regards
--
Giulio Benetti
CTO
MICRONOVA SRL
Sede: Via A. Niedda 3 - 35010 Vigonza (PD)
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next prev parent reply other threads:[~2021-02-05 18:55 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-17 21:56 [PATCH v3 0/5] serial: 8250: Add rs485 emulation to 8250_dw Heiko Stuebner
2020-05-17 21:56 ` [PATCH v3 1/5] serial: 8520_port: Fix function param documentation Heiko Stuebner
2020-05-18 15:09 ` Andy Shevchenko
2020-05-17 21:56 ` [PATCH v3 2/5] dt-bindings: serial: Add binding for rs485 receiver enable GPIO Heiko Stuebner
2020-05-17 21:56 ` [PATCH v3 3/5] serial: 8250: Support separate rs485 rx-enable GPIO Heiko Stuebner
2020-05-18 4:50 ` Lukas Wunner
2020-05-18 8:04 ` Heiko Stübner
2020-05-18 9:19 ` Lukas Wunner
2020-05-18 15:12 ` Andy Shevchenko
2020-05-18 15:22 ` Lukas Wunner
2020-05-18 15:24 ` Lukas Wunner
2020-05-18 16:13 ` Maarten Brock
2020-05-18 16:35 ` Andy Shevchenko
2020-05-18 17:05 ` Maarten Brock
2020-05-18 17:16 ` Andy Shevchenko
2024-01-24 10:29 ` Farouk Bouabid
2020-05-17 21:56 ` [PATCH v3 4/5] serial: 8250: Handle implementations not having TEMT interrupt using em485 Heiko Stuebner
2020-05-18 15:19 ` Andy Shevchenko
2020-05-17 21:56 ` [PATCH v3 5/5] serial: 8250_dw: add em485 support Heiko Stuebner
2020-05-18 15:21 ` Andy Shevchenko
2021-02-02 0:31 ` Giulio Benetti
2021-02-02 11:22 ` Andy Shevchenko
2021-02-05 17:46 ` Giulio Benetti [this message]
2021-02-05 19:29 ` Andy Shevchenko
2022-09-22 9:56 ` [PATCH v3 0/5] serial: 8250: Add rs485 emulation to 8250_dw Lukas Wunner
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