[PATCH RFC 0/1] i2c: add slave testunit driver

[Wolfram Sang <wsa+renesas@sang-engineering.com>]

Motivated by a series by Alain Volmat which implements SMBus Host Notify
support as a slave backend[1], I wondered how I could actually test it.
Then, I picked up my old idea of a "custom remote device" and
implemented it as another slave backend. This is the first draft and it
works quite well on my Renesas Lager board where I connected two I2C
busses where both I2C controllers are master and slave. One slave is the
testunit, one slave is the HostNotify listener.

While I really like Alain's approach, there is still some more testing
needed. So, I already release my testing environment, maybe other people
are interested, too. This patch depends on a documentation update. Also,
for Renesas R-Car SoCs, some fixes are needed. I suggest you simply pull
this branch here:

git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/i2c/slave-testunit

As mentioned elsewhere, support for SMBus Alert and I2C_M_RECV_LEN are
already planned. But I guess you can do much more.

Ideas and comments welcome!

Happy hacking,

   Wolfram

[1] http://patchwork.ozlabs.org/project/linux-i2c/list/?series=185718&state=*

Wolfram Sang (1):
  i2c: add slave testunit driver

 Documentation/i2c/slave-testunit-backend.rst |  48 ++++++
 drivers/i2c/Kconfig                          |   8 +
 drivers/i2c/Makefile                         |   1 +
 drivers/i2c/i2c-slave-testunit.c             | 146 +++++++++++++++++++
 4 files changed, 203 insertions(+)
 create mode 100644 Documentation/i2c/slave-testunit-backend.rst
 create mode 100644 drivers/i2c/i2c-slave-testunit.c

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2.20.1