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Re: [RFC PATCH 0/3] UART slave device bus

From One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Newsgroups linux.kernel
Subject Re: [RFC PATCH 0/3] UART slave device bus
Date 2016-08-19 13:10 +0200
Message-ID <s7PQu-4Rb-9@gated-at.bofh.it> (permalink)
References <s7k9X-TX-3@gated-at.bofh.it> <s7GNd-7nF-41@gated-at.bofh.it> <s7GWS-7sc-47@gated-at.bofh.it> <s7Kxs-1qQ-21@gated-at.bofh.it> <s7Mzh-2Fi-85@gated-at.bofh.it>
Organization Intel Corporation

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> If possible, please do a callback for every character that arrives.
> And not only if the rx buffer becomes full, to give the slave driver
> a chance to trigger actions almost immediately after every character.
> This probably runs in interrupt context and can happen often.

We don't realistically have the clock cycles to do that on a low end
embedded processor handling high speed I/O. The best you can do is
trigger a workqueue to switch the buffer data around and call the helper
while the uart may be receiving more bytes.

What you are asking for you'd get out of the first parts of tidying up
the receive paths because you'd set a different port->rx() method and get
bursts of characters, flags and length data.

Alan

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[RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-18 03:20 +0200
  Re: [RFC PATCH 0/3] UART slave device bus Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-08-18 12:30 +0200
    Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-18 12:40 +0200
      Re: [RFC PATCH 0/3] UART slave device bus Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-08-18 13:00 +0200
        Re: [RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-18 16:00 +0200
    Re: [RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-18 15:20 +0200
      Re: [RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-19 03:50 +0200
        Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-19 13:10 +0200
  Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-18 12:40 +0200
    Re: [RFC PATCH 0/3] UART slave device bus Pavel Machek <pavel@ucw.cz> - 2016-08-18 12:50 +0200
      Re: [RFC PATCH 0/3] UART slave device bus Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-08-18 13:00 +0200
        Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-18 13:20 +0200
        Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-18 16:50 +0200
      Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-18 13:00 +0200
      Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-18 13:30 +0200
    Re: [RFC PATCH 0/3] UART slave device bus Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-08-18 13:00 +0200
      Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-18 13:10 +0200
        Re: [RFC PATCH 0/3] UART slave device bus Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-08-18 13:30 +0200
          Re: [RFC PATCH 0/3] UART slave device bus Pavel Machek <pavel@ucw.cz> - 2016-08-18 13:50 +0200
          Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-18 14:00 +0200
      Re: [RFC PATCH 0/3] UART slave device bus Pavel Machek <pavel@ucw.cz> - 2016-08-18 13:20 +0200
        Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-18 13:20 +0200
          Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-18 13:50 +0200
            Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-18 14:20 +0200
        Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-18 13:50 +0200
          Re: [RFC PATCH 0/3] UART slave device bus Pavel Machek <pavel@ucw.cz> - 2016-08-18 15:10 +0200
    Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-18 13:00 +0200
      Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-18 13:10 +0200
        Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-18 13:50 +0200
          Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-18 14:10 +0200
  Re: [RFC PATCH 0/3] UART slave device bus Pavel Machek <pavel@ucw.cz> - 2016-08-18 13:10 +0200
  Re: [RFC PATCH 0/3] UART slave device bus Linus Walleij <linus.walleij@linaro.org> - 2016-08-18 15:20 +0200
    Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-19 03:50 +0200
  Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-18 16:30 +0200
    Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-19 03:10 +0200
    Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-19 03:30 +0200
    Re: [RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-19 04:50 +0200
      Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-19 13:40 +0200
        Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-19 17:40 +0200
  Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-19 03:30 +0200
    Re: [RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-19 03:40 +0200
      Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-19 07:30 +0200
        Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-19 09:40 +0200
          Re: [RFC PATCH 0/3] UART slave device bus Oleksij Rempel <linux@rempel-privat.de> - 2016-08-19 10:00 +0200
            Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-19 20:00 +0200
              Re: [RFC PATCH 0/3] UART slave device bus Oleksij Rempel <linux@rempel-privat.de> - 2016-08-19 22:30 +0200
              Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-20 15:40 +0200
                Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-21 10:00 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-22 22:50 +0200
                Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-22 23:30 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Arnd Bergmann <arnd@arndb.de> - 2016-08-22 23:50 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-23 00:50 +0200
                Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-23 01:00 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-23 01:20 +0200
                Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-23 09:30 +0200
          Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-19 13:10 +0200
            Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-19 19:50 +0200
              Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-20 15:30 +0200
                Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-21 10:00 +0200
                Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-21 19:20 +0200
                Re: [RFC PATCH 0/3] UART slave device bus "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-08-21 20:30 +0200
                Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-22 11:20 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-22 11:40 +0200
        Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-19 13:10 +0200
          Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-19 16:50 +0200
  Re: [RFC PATCH 0/3] UART slave device bus Arnd Bergmann <arnd@arndb.de> - 2016-08-22 14:40 +0200
    Re: [RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-22 15:50 +0200
      Re: [RFC PATCH 0/3] UART slave device bus Arnd Bergmann <arnd@arndb.de> - 2016-08-22 17:30 +0200
        Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-22 17:30 +0200
          Re: [RFC PATCH 0/3] UART slave device bus Arnd Bergmann <arnd@arndb.de> - 2016-08-22 18:00 +0200
        Re: [RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-22 18:50 +0200
          Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-22 19:10 +0200
            Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-22 19:40 +0200
              Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-22 23:20 +0200
                Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-22 23:40 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Pavel Machek <pavel@ucw.cz> - 2016-08-23 00:10 +0200
                Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-23 01:00 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-23 02:00 +0200
                Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-23 02:20 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-23 03:00 +0200
                Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-24 16:00 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-24 16:40 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-23 13:50 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-23 01:10 +0200
            Re: [RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-22 19:40 +0200
              Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-22 22:10 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-23 00:10 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-23 00:20 +0200
        Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-22 19:20 +0200
          Re: [RFC PATCH 0/3] UART slave device bus Marcel Holtmann <marcel@holtmann.org> - 2016-08-22 23:10 +0200
            Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-23 00:10 +0200
              Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-23 01:20 +0200
                Re: [RFC PATCH 0/3] UART slave device bus Sebastian Reichel <sre@kernel.org> - 2016-08-23 01:50 +0200
            Re: [RFC PATCH 0/3] UART slave device bus One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-23 00:20 +0200
          Re: [RFC PATCH 0/3] UART slave device bus Linus Walleij <linus.walleij@linaro.org> - 2016-08-24 14:30 +0200
        Re: [RFC PATCH 0/3] UART slave device bus Rob Herring <robh@kernel.org> - 2016-08-23 23:20 +0200

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