[PATCH 0/3] WIP: i2c slave support

[Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>]

From: Wolfram Sang <wsa+renesas-jBu1N2QxHDJrcw3mvpCnnVaTQe2KTcn/@public.gmane.org>

I am currently working on the long standing issue of slave support for the I2C
framework. Here is a very rough first draft, so you can see what path I chose.
Three big things are still missing: documentation, a driver supporting the
hooks created here, and testing. So, this is more a draft how the interface
could look like and will soon get the details when I implement the support for
the i2c-rcar driver. If you want to comment, that is appreciated. However,
please focus on high-level comments, not implementation details. There is a lot
of sloppiness in the details, I do know. If they are still present in the first
real patches, then you can complain ;)

Since docs are still missing, here is a rough description: A software slave
driver is a standard I2C driver which will be matched against a standard I2C
client. The exception is that it requests a slave instance from its adapter via
i2c_slave_request() in probe. It provides a callback which will be invoked in
case events happen for this slave.

And again: This is a draft, up to now compile tested only.

Wolfram Sang (3):
  WIP: i2c core changes for slave support
  WIP: sketch of an slave-eeprom simulator
  WIP: adapt dts for i2c slave use

 arch/arm/boot/dts/r8a7790-lager.dts |  15 ++--
 drivers/i2c/i2c-core.c              |  42 +++++++++++
 drivers/i2c/i2c-slave-eeprom.c      | 140 ++++++++++++++++++++++++++++++++++++
 include/linux/i2c-slave.h           |  28 ++++++++
 include/linux/i2c.h                 |   5 ++
 5 files changed, 225 insertions(+), 5 deletions(-)
 create mode 100644 drivers/i2c/i2c-slave-eeprom.c
 create mode 100644 include/linux/i2c-slave.h

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2.0.0