From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Lukas Wunner <lukas@wunner.de>
Cc: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
"open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
"Jiri Slaby" <jirislaby@kernel.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Johan Hovold" <johan@kernel.org>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
"Heikki Krogerus" <heikki.krogerus@linux.intel.com>,
"Raymond Tan" <raymond.tan@intel.com>,
"Heiko Stuebner" <heiko@sntech.de>
Subject: Re: [PATCH 1/7] serial: 8250_dwlib: RS485 HW half duplex support
Date: Mon, 7 Mar 2022 00:07:44 +0200 [thread overview]
Message-ID: <CAHp75Vdxa_p866t5B7zJ8nHS-v+tu3vLiW0=vaBznnyCGyve_g@mail.gmail.com> (raw)
In-Reply-To: <20220306184857.GA19394@wunner.de>
On Mon, Mar 7, 2022 at 12:00 AM Lukas Wunner <lukas@wunner.de> wrote:
> On Wed, Mar 02, 2022 at 11:56:00AM +0200, Ilpo Järvinen wrote:
...
> Does the DesignWare UART use dedicated DE and RE pins instead of
> the RTS pin? That would be quite unusual.
They are muxed with other UART pins on SoC level, but I don't remember
by heart which ones. According to the Synopsys datasheet they are
separate signals. It might be that I'm missing something, since the
last time I looked was last year.
...
> > + d->hw_rs485_support = device_property_read_bool(p->dev, "snps,rs485-interface-en");
> > + if (d->hw_rs485_support)
> > + p->rs485_config = dw8250_rs485_config;
> > +
>
> You wrote in the commit message that rs485 support is present from
> version 4.0 onward. Can't we just check the IP version and enable
> rs485 support for >= 4.0? That would seem more appropriate instead
> of introducing yet another new property.
AFAIU this is dependent on the IP syntheses. I.o.w. version 4.0+ is a
prerequisite, but doesn't automatically mean that there is a support.
Unfortunately there is no way to tell this clearly in the IP
configuration register.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2022-03-06 22:08 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-02 9:55 [PATCH 0/7] Add RS485 support to DW UART Ilpo Järvinen
2022-03-02 9:56 ` [PATCH 1/7] serial: 8250_dwlib: RS485 HW half duplex support Ilpo Järvinen
2022-03-06 18:48 ` Lukas Wunner
2022-03-06 22:07 ` Andy Shevchenko [this message]
2022-03-07 9:19 ` Ilpo Järvinen
2022-03-07 19:18 ` Lukas Wunner
2022-03-07 19:39 ` Andy Shevchenko
2022-03-08 12:16 ` Ilpo Järvinen
2022-03-08 12:22 ` Lukas Wunner
2022-03-08 12:59 ` Ilpo Järvinen
2022-03-08 14:50 ` Lukas Wunner
2022-03-08 14:53 ` Andy Shevchenko
2022-03-08 20:30 ` Lukas Wunner
2022-03-09 9:51 ` Ilpo Järvinen
2022-03-07 10:54 ` Ilpo Järvinen
2022-03-09 8:52 ` Lukas Wunner
2022-03-09 12:19 ` Ilpo Järvinen
2022-03-09 12:59 ` Lukas Wunner
2022-03-02 9:56 ` [PATCH 2/7] serial: 8250_dwlib: RS485 HW full " Ilpo Järvinen
2022-03-06 18:51 ` Lukas Wunner
2022-03-07 9:22 ` Ilpo Järvinen
2022-03-02 9:56 ` [RFC PATCH 3/7] serial: 8250_dwlib: Implement SW half " Ilpo Järvinen
2022-03-06 19:21 ` Lukas Wunner
2022-03-06 22:13 ` Andy Shevchenko
2022-03-02 9:56 ` [PATCH 4/7] dt_bindings: snps-dw-apb-uart: Add RS485 Ilpo Järvinen
2022-03-02 17:47 ` Rob Herring
2022-03-02 9:56 ` [RFC PATCH 5/7] serial: termbits: ADDRB to indicate 9th bit addressing mode Ilpo Järvinen
2022-03-02 9:56 ` [RFC PATCH 6/7] serial: General support for multipoint addresses Ilpo Järvinen
2022-03-06 19:40 ` Lukas Wunner
2022-03-07 9:48 ` Ilpo Järvinen
2022-03-09 19:05 ` Lukas Wunner
2022-03-10 12:29 ` Ilpo Järvinen
2022-03-10 14:09 ` Andy Shevchenko
2022-03-02 9:56 ` [RFC PATCH 7/7] serial: 8250_dwlib: Support for 9th bit multipoint addressing Ilpo Järvinen
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