[PATCH v5 0/3] Add MCTP-over-KCS transport binding

[Konstantin Aladyshev <aladyshev22@gmail.com>]

This change adds a MCTP KCS transport binding, as defined by the DMTF
specificiation DSP0254 - "MCTP KCS Transport Binding".
A MCTP protocol network device is created for each KCS channel found in
the system.
The interrupt code for the KCS state machine is based on the current
IPMI KCS driver.
Since the KCS subsystem code is now used both in IPMI and MCTP drivers
the separate patchsets move KCS subsystem includes to a common folder.

Tested:
PLDM communication between the HOST and BMC was tested with both
components implemented via open-source software:
- The HOST (UEFI firmware) part was based one the edk2 [1] and
edk2-platforms [2] code,
- The BMC part was based on the openbmc [3] distribution.

The testing process and all the necessary utilities are described in
the [4] repository.

[1]: https://github.com/tianocore/edk2
[2]: https://github.com/tianocore/edk2-platforms
[3]: https://github.com/openbmc/openbmc
[4]: https://github.com/Kostr/PLDM

Changes v4 -> v5:
 - correct spelling errors in description
 - check that rx data is big enough for binding structures
 - use unsigned int type for index and len variables
 - refactor mctp_kcs_rx_work() function
 - arrange local variables in reverse xmas tree order

Changes v3 -> v4:
 - drop 'inline' keyword

Changes v2 -> v3:
 - use 'dev_err_probe' correctly

Changes v1 -> v2:
 - correct warning found by kernel test robot
 - use 'i2c_smbus_pec' library function for PEC calculation
 - several code style corrections based on Jonathan Cameron comments
Original patchset can be found here:
https://lwn.net/ml/linux-kernel/20230928123009.2913-1-aladyshev22@gmail.com/


Konstantin Aladyshev (3):
  ipmi: Move KCS headers to common include folder
  ipmi: Create header with KCS interface defines
  mctp: Add MCTP-over-KCS transport binding

 drivers/char/ipmi/kcs_bmc.c                   |   8 +-
 drivers/char/ipmi/kcs_bmc_aspeed.c            |   3 +-
 drivers/char/ipmi/kcs_bmc_cdev_ipmi.c         |  73 +--
 drivers/char/ipmi/kcs_bmc_npcm7xx.c           |   2 +-
 drivers/char/ipmi/kcs_bmc_serio.c             |   2 +-
 drivers/net/mctp/Kconfig                      |   8 +
 drivers/net/mctp/Makefile                     |   1 +
 drivers/net/mctp/mctp-kcs.c                   | 600 ++++++++++++++++++
 include/linux/ipmi_kcs.h                      |  80 +++
 .../char/ipmi => include/linux}/kcs_bmc.h     |   0
 .../ipmi => include/linux}/kcs_bmc_client.h   |   3 +-
 .../ipmi => include/linux}/kcs_bmc_device.h   |   3 +-
 12 files changed, 699 insertions(+), 84 deletions(-)
 create mode 100644 drivers/net/mctp/mctp-kcs.c
 create mode 100644 include/linux/ipmi_kcs.h
 rename {drivers/char/ipmi => include/linux}/kcs_bmc.h (100%)
 rename {drivers/char/ipmi => include/linux}/kcs_bmc_client.h (97%)
 rename {drivers/char/ipmi => include/linux}/kcs_bmc_device.h (96%)

-- 
2.25.1