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Date:   Fri, 15 Oct 2021 11:46:59 +0200
From:   Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        <arnaud.pouliquen@...s.st.com>, Suman Anna <s-anna@...com>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>
Subject: [PATCH v10 0/2] Add rpmsg tty driver

Update previous revision [1] based on Mathieu Poirier's review.

This patchset introduces a TTY console on top of the RPMsg framework which
enables the following use cases:
- Provide a console to communicate easily with the remote processor application.
- Provide an interface to get the remote processor log traces without ring
  buffer limitation.
- Ease the migration from MPU + MCU processors to multi core processors
  (MPU and MCU integrated in one processor) by offering a virtual serial link.

An alternative of this proposed solution would consist in using the virtio
console:
The drawback with that solution is that it requires a specific virtio buffer
(in addition to the one already used for RPMsg) which does not fit with remote
processors with little memory. The proposed solution allows to multiplex the
console with the other rpmsg services, optimizing the memory.

The first patch adds an API to the rpmsg framework ('get max transmission unit')
and the second one is the rpmsg tty driver itself.

Applied and tested on kernel V5.15-rc1

[1] https://lkml.org/lkml/2021/10/8/726 

Arnaud Pouliquen (2):
  rpmsg: core: add API to get MTU
  tty: add rpmsg driver

 drivers/rpmsg/rpmsg_core.c       |  21 +++
 drivers/rpmsg/rpmsg_internal.h   |   2 +
 drivers/rpmsg/virtio_rpmsg_bus.c |  10 ++
 drivers/tty/Kconfig              |  12 ++
 drivers/tty/Makefile             |   1 +
 drivers/tty/rpmsg_tty.c          | 274 +++++++++++++++++++++++++++++++
 include/linux/rpmsg.h            |  10 ++
 7 files changed, 330 insertions(+)
 create mode 100644 drivers/tty/rpmsg_tty.c

-- 
2.17.1

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