[PATCH v2 0/4] i2c: SMBus ARP support

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

Hi,

Changed in v2:

- Using kzalloc instead of kzalloc_obj. kzalloc_obj() is clearly not ready yet
  (scripts/checkpatch.pl should not promote it yet).

Original cover letter:

I know there has been a couple of PoCs for ARP over the years, but for
what ever reason none of them were ever made part of the kernel. I
don't know how common ARP-capable devices are, but since they do
exist, we really should enumerate them as intended. I'm guessing that
in Linux ARP-capable devices have so far been left mostly undetected.

The problem I'm trying to tackle with these is to detect SMBus devices
on discrete components like PCIe cards. We obviously won't have any
kind ACPI or DT description for those, so we would always have to
create the device for them in the drivers. Unfortunately in some cases
it's actually very difficult to know what exactly is attached to the
I2C on those cards because the vendors can put what ever they like
there - this is the case at least with some of the GPUs it seems. But
luckily those I2C/SMBus devices are at least in some cases fully
ARP-capable.

I'm including a patch that binds the detected ARP-capable MCTP devices
to the driver. There is also a target mode test driver.

thanks,


Heikki Krogerus (4):
  i2c: SMBus Address Resolution Protocol implementation for host side
  i2c: Sysfs attribute files for the Unique Device Identifier fields
  mctp i2c: Enable SMBus ARP discovery
  i2c: Add SMBus ARP target mode test driver

 Documentation/ABI/testing/sysfs-bus-i2c |  53 ++++
 drivers/i2c/Kconfig                     |   6 +
 drivers/i2c/Makefile                    |   3 +-
 drivers/i2c/i2c-core-arp.c              | 334 ++++++++++++++++++++++++
 drivers/i2c/i2c-core-base.c             | 154 ++++++++++-
 drivers/i2c/i2c-core.h                  |   8 +
 drivers/i2c/i2c-target-arp.c            | 201 ++++++++++++++
 drivers/net/mctp/mctp-i2c.c             |   8 +
 include/linux/i2c-smbus.h               |  67 +++++
 include/linux/i2c.h                     |  10 +
 include/linux/mod_devicetable.h         |  13 +
 scripts/mod/devicetable-offsets.c       |   8 +
 scripts/mod/file2alias.c                |  24 ++
 13 files changed, 878 insertions(+), 11 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-i2c
 create mode 100644 drivers/i2c/i2c-core-arp.c
 create mode 100644 drivers/i2c/i2c-target-arp.c

-- 
2.50.1