From: Vostrikov Andrey <andrey.vostrikov@cogentembedded.com>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Rob Herring <robherring2@gmail.com>,
Peter Hurley <peter@hurleysoftware.com>,
"H. Nikolaus Schaller" <hns@goldelico.com>,
Mark Rutland <mark.rutland@arm.com>,
List for communicating with real GTA04 owners
<gta04-owner@goldelico.com>, Tomeu Vizoso <tomeu@tomeuvizoso.net>,
NeilBrown <neil@brown.name>,
One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
Arnd Bergmann <arnd@arndb.de>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sebastian Reichel <sre@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Pavel Machek <pavel@ucw.cz>,
"linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
Grant Likely <grant.likely@linaro.org>,
Jiri Slaby <jslaby@suse.cz>, Marek Belisko <marek@goldelico.com>
Subject: Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4
Date: Wed, 20 Jan 2016 23:09:39 +0300 [thread overview]
Message-ID: <691920039.20160120230939@cogentembedded.com> (raw)
In-Reply-To: <CAKdAkRQh7xSgOXERhA8EjXEfX5m-PTTjiv757X7FYxK=bhfpww@mail.gmail.com>
Hi, Dmitry.
> On Fri, Jan 15, 2016 at 11:34 PM, Vostrikov Andrey
> <andrey.vostrikov@cogentembedded.com> wrote:
>>
>> Yes, such implementation will help. There is a need for interface like UART BUS that will probe devices without user space.
>> Serial I/O for input subsystem defines new type of bus and uses dedicated line discipline, but it still unable to start driver by itself and requires call from 'inputattach' to open port, assign line discipline and go to forever wait on 'read'.
> That was done mainly because almost none of the serial protocols could
> be auto-probed, so device initialization/setup was moved out of kernel
> and thus we have the separate line discipline and inputattach utility.
This is understandable for "dummy" devices like mice, that only
report input events.
But in case there is "intellectual" MCU, that must reply on specific
commands with specific response - it could be auto-probed. Especially
when it is hardwired. Unfortunately, there is no API to do it.
Opening port and attaching line discipline from kernel side
does not look good. The only example is '/dev/console', which is
implemented that way.
> Thanks.
--
Best regards,
Andrey Vostrikov
next prev parent reply other threads:[~2016-01-20 20:09 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-11 1:56 [PATCH 0/4] UART slave device support - version 4 NeilBrown
2015-05-11 1:56 ` [PATCH 1/4] TTY: use class_find_device to find port in uart_suspend/resume NeilBrown
2015-05-11 1:56 ` [PATCH 3/4] TTY: add support for uart_slave devices NeilBrown
2015-05-12 8:31 ` Paul Bolle
2015-05-12 23:35 ` NeilBrown
2015-05-11 1:56 ` [PATCH 4/4] tty/slaves: add a driver to power on/off UART attached devices NeilBrown
2015-05-11 1:56 ` [PATCH 2/4] TTY: split tty_register_device_attr into 'initialize' and 'add' parts NeilBrown
2015-05-31 22:01 ` [PATCH 0/4] UART slave device support - version 4 Greg Kroah-Hartman
2015-08-07 13:01 ` Linus Walleij
2015-08-11 23:20 ` NeilBrown
2015-08-28 5:52 ` [Gta04-owner] " Dr. H. Nikolaus Schaller
2015-08-28 7:02 ` Pavel Machek
2015-08-28 9:43 ` Dr. H. Nikolaus Schaller
2015-08-28 11:04 ` Pavel Machek
2015-08-28 20:04 ` Christ van Willegen
2016-01-12 13:06 ` Tomeu Vizoso
2016-01-12 13:28 ` [Gta04-owner] " H. Nikolaus Schaller
2016-01-13 19:15 ` Mark Rutland
[not found] ` <1CD6CA14-AE4F-444F-A9A2-CF9B9485F2DC@goldelico.com>
2016-01-15 11:01 ` Mark Rutland
2016-01-15 15:05 ` H. Nikolaus Schaller
2016-01-15 15:43 ` Andrey Vostrikov
2016-01-15 16:08 ` H. Nikolaus Schaller
2016-01-15 17:16 ` Peter Hurley
2016-01-15 17:32 ` H. Nikolaus Schaller
2016-01-15 17:43 ` Peter Hurley
2016-01-15 17:58 ` H. Nikolaus Schaller
2016-01-15 19:23 ` Peter Hurley
2016-01-15 21:24 ` H. Nikolaus Schaller
2016-01-15 22:40 ` Rob Herring
2016-01-16 7:34 ` Vostrikov Andrey
2016-01-16 23:31 ` Rob Herring
2016-01-17 8:53 ` H. Nikolaus Schaller
2016-01-17 14:19 ` One Thousand Gnomes
2016-01-17 17:57 ` H. Nikolaus Schaller
2016-01-17 19:38 ` One Thousand Gnomes
2016-01-18 8:17 ` H. Nikolaus Schaller
2016-01-18 8:56 ` Andrey Vostrikov
2016-01-18 11:52 ` H. Nikolaus Schaller
2016-01-18 11:19 ` One Thousand Gnomes
2016-01-18 20:58 ` H. Nikolaus Schaller
2016-01-18 22:03 ` One Thousand Gnomes
2016-01-18 22:32 ` H. Nikolaus Schaller
2016-01-19 14:25 ` One Thousand Gnomes
2016-01-20 17:33 ` H. Nikolaus Schaller
2016-01-20 16:11 ` H. Nikolaus Schaller
2016-01-20 17:46 ` One Thousand Gnomes
2016-01-20 18:03 ` H. Nikolaus Schaller
2016-01-22 15:45 ` Tomeu Vizoso
2016-01-22 16:49 ` Rob Herring
2016-01-22 20:12 ` One Thousand Gnomes
2016-01-23 7:40 ` Andreas Kemnade
2016-01-23 12:19 ` H. Nikolaus Schaller
2016-01-23 17:28 ` One Thousand Gnomes
2016-01-23 22:04 ` H. Nikolaus Schaller
2016-01-24 17:10 ` One Thousand Gnomes
2016-01-25 10:36 ` H. Nikolaus Schaller
2016-01-19 6:32 ` Andreas Kemnade
2016-01-20 19:38 ` Dmitry Torokhov
2016-01-20 20:09 ` Vostrikov Andrey [this message]
2016-01-15 16:12 ` Mark Rutland
2016-01-15 19:16 ` H. Nikolaus Schaller
2016-01-15 19:40 ` Pavel Machek
2016-01-15 20:35 ` H. Nikolaus Schaller
2016-01-12 21:28 ` NeilBrown
2016-01-13 19:00 ` Pavel Machek
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