Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4

From	One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Newsgroups	linux.kernel
Subject	Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4
Date	2016-01-17 15:30 +0100
Message-ID	<qRWv8-3B6-1@gated-at.bofh.it> (permalink)
References	(7 earlier) <qRgcz-Lu-15@gated-at.bofh.it> <qRllU-42W-19@gated-at.bofh.it> <qRtCN-1jJ-1@gated-at.bofh.it> <qRIBP-2Oi-3@gated-at.bofh.it> <qRRlM-8x-5@gated-at.bofh.it>
Organization	Intel Corporation

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> When translating the system requirements you have provided and mixing
> with mine, I think we need:
> 
> 1. mechanism to receive characters sent by the peer MCU

Low level driver queue of some kind

> 2. mechanism to send characters to the peer (or a block for firmware download)

Ditto (maybe even netlink)

> 3. mechanism to open/close the UART (even if there is no user space/tty client)

So don't use the tty layer in the first place

> 4. mechanism to set the struct termios of the UART (baud rate etc.)

Can be done without the tty layer.

> 5. mechanism to be notified that user space has opened/closed the tty port or changes mctrl
> 6. mechanism to prevent the tty layer to present a /dev/tty* to user space at all

This sounds the wrong way up entirely.

Instead of trying to make the tty layer do weird stuff, make the driver
present a tty that is only the things that it wants to be exposed as a
tty if any. If there are none then don't use the tty layer at all.

We have lots of interfaces to random MCUs. Many of them talk "serial"
protocols, almost none of them pretend to be the tty layer.

Alan

Thread

Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Mark Rutland <mark.rutland@arm.com> - 2016-01-15 12:10 +0100
  Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-15 16:10 +0100
    Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Andrey Vostrikov <andrey.vostrikov@cogentembedded.com> - 2016-01-15 16:50 +0100
      Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-15 17:10 +0100
        Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Peter Hurley <peter@hurleysoftware.com> - 2016-01-15 18:20 +0100
          Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-15 18:40 +0100
            Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Peter Hurley <peter@hurleysoftware.com> - 2016-01-15 18:50 +0100
              Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-15 19:00 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Peter Hurley <peter@hurleysoftware.com> - 2016-01-15 20:30 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-15 22:30 +0100
          Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Rob Herring <robherring2@gmail.com> - 2016-01-15 23:50 +0100
            Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Vostrikov Andrey <andrey.vostrikov@cogentembedded.com> - 2016-01-16 08:40 +0100
              Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Rob Herring <robh@kernel.org> - 2016-01-17 00:40 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-17 10:00 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-17 15:30 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-17 19:00 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-17 20:40 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-18 09:20 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Andrey Vostrikov <andrey.vostrikov@cogentembedded.com> - 2016-01-18 10:00 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-18 13:00 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-18 12:30 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-18 22:00 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-18 23:10 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-18 23:40 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-19 15:30 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-20 18:40 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-20 17:20 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-20 18:50 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-20 19:10 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Tomeu Vizoso <tomeu@tomeuvizoso.net> - 2016-01-22 17:00 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Rob Herring <robherring2@gmail.com> - 2016-01-22 18:00 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-22 21:20 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Andreas Kemnade <andreas@kemnade.info> - 2016-01-23 08:50 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-23 13:20 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-23 18:30 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-23 23:10 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-01-24 18:20 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-25 11:40 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Andreas Kemnade <andreas@kemnade.info> - 2016-01-19 07:40 +0100
              Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2016-01-20 20:40 +0100
                Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Vostrikov Andrey <andrey.vostrikov@cogentembedded.com> - 2016-01-20 21:10 +0100
    Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 Mark Rutland <mark.rutland@arm.com> - 2016-01-15 17:20 +0100
      Re: [Gta04-owner] [PATCH 0/4] UART slave device support - version 4 "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-15 20:20 +0100

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