[v8,0/8] I3C target mode support

Message

Frank Li Feb. 8, 2024, 5:01 p.m. UTC

This  patch introduces support for I3C target mode, which is referenced
with a PCIe Endpoint system. It also establishes a configuration framework
(configfs) for the I3C target controller driver and the I3C target function
driver

Typic usage as

The user can configure the i3c-target-tty device using configfs entry. In
order to change the vendorid, the following commands can be used

        # echo 0x011b > functions/tty/func1/vendor_id
        # echo 0x1000 > functions/tty/func1/part_id
        # echo 0x6 > functions/tty/t/bcr

Binding i3c-target-tty Device to target Controller
------------------------------------------------

In order for the target function device to be useful, it has to be bound to
a I3C target controller driver. Use the configfs to bind the function
device to one of the controller driver present in the system::

        # ln -s functions/pci_epf_test/func1 controllers/44330000.i3c-target/

Host side:
        cat /dev/ttyI3C0
Taret side:
        echo abc >/dev/ttyI3C0

Notes about header files.

About Ilpo Järvinen's header file comments, it can pass build, some header
should be included by other header files.

I added some, but I am not sure that is all needs. There may have tools,
which can help check, but I don't know.

Chagne from v2 to v3
- using 'mode' distingiush master and target.
- move svc-i3c-target.c to under master,
- built together with svc-i3c-master.c

Change from v1 to v2
- change "slave" to "target"
- include master side tty patch
- fixed dtbcheck problem
- fixed kerne-doc check warning

Some review comment may be lost since it is quite long time since v1. Now
master side dependent patches already in linux-next. So sent target side
patches with tty support again.

No sure why an additional "\r\n" appended.

Frank Li (8):
  i3c: add target mode support
  dt-bindings: i3c: svc: add proptery mode
  Documentation: i3c: Add I3C target mode controller and function
  i3c: svc: Add svc-i3c-main.c and svc-i3c.h
  i3c: target: add svc target controller support
  i3c: target: func: add tty driver
  i3c: add API i3c_dev_gettstatus_format1() to get target device status
  tty: i3c: add TTY over I3C master support

 .../bindings/i3c/silvaco,i3c-master.yaml      |  11 +-
 Documentation/driver-api/i3c/index.rst        |   1 +
 .../driver-api/i3c/target/i3c-target-cfs.rst  | 109 +++
 .../driver-api/i3c/target/i3c-target.rst      | 189 +++++
 .../driver-api/i3c/target/i3c-tty-howto.rst   | 109 +++
 Documentation/driver-api/i3c/target/index.rst |  13 +
 drivers/i3c/Kconfig                           |  31 +-
 drivers/i3c/Makefile                          |   3 +
 drivers/i3c/device.c                          |  24 +
 drivers/i3c/func/Kconfig                      |   9 +
 drivers/i3c/func/Makefile                     |   3 +
 drivers/i3c/func/tty.c                        | 481 +++++++++++
 drivers/i3c/i3c-cfs.c                         | 389 +++++++++
 drivers/i3c/internals.h                       |   1 +
 drivers/i3c/master.c                          |  26 +
 drivers/i3c/master/Makefile                   |   3 +-
 drivers/i3c/master/svc-i3c-main.c             |  80 ++
 drivers/i3c/master/svc-i3c-master.c           |  34 +-
 drivers/i3c/master/svc-i3c-target.c           | 776 ++++++++++++++++++
 drivers/i3c/master/svc-i3c.h                  |  15 +
 drivers/i3c/target.c                          | 453 ++++++++++
 drivers/tty/Kconfig                           |  13 +
 drivers/tty/Makefile                          |   1 +
 drivers/tty/i3c_tty.c                         | 432 ++++++++++
 include/linux/i3c/device.h                    |   1 +
 include/linux/i3c/target.h                    | 548 +++++++++++++
 26 files changed, 3724 insertions(+), 31 deletions(-)
 create mode 100644 Documentation/driver-api/i3c/target/i3c-target-cfs.rst
 create mode 100644 Documentation/driver-api/i3c/target/i3c-target.rst
 create mode 100644 Documentation/driver-api/i3c/target/i3c-tty-howto.rst
 create mode 100644 Documentation/driver-api/i3c/target/index.rst
 create mode 100644 drivers/i3c/func/Kconfig
 create mode 100644 drivers/i3c/func/Makefile
 create mode 100644 drivers/i3c/func/tty.c
 create mode 100644 drivers/i3c/i3c-cfs.c
 create mode 100644 drivers/i3c/master/svc-i3c-main.c
 create mode 100644 drivers/i3c/master/svc-i3c-target.c
 create mode 100644 drivers/i3c/master/svc-i3c.h
 create mode 100644 drivers/i3c/target.c
 create mode 100644 drivers/tty/i3c_tty.c
 create mode 100644 include/linux/i3c/target.h