The iSMT (Intel SMBus Message Transport) supports multi-master I2C/SMBus,
as well as IPMI.  It's operation is DMA-based and utilizes descriptors to
initiate transactions on the bus.

The iSMT hardware can act as both a master and a target, although this
driver only supports being a master.
Signed-off-by: NNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: NBill Brown <bill.e.brown@intel.com>
Tested-by: NSeth Heasley <seth.heasley@intel.com>
Reviewed-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NWolfram Sang <wolfram@the-dreams.de>