[i2c] PCA954x I2C switch/multiplexer

[Edelhaeuser, Frank]

The driver I submitted implements the "new style" driver model. These
driver's don't probe the bus automatically. Instead, devices must be
instantiated by calling i2c_register_board_info() for each multiplexer
device. Please note that this driver implements a special syntax for the
type field: e.g. .type = "pxa9544,5" tells the driver to create 4
virtual i2c buses with ids 5, 6, 7 and 8. You would
i2c_register_board_info() your PXA9544 multiplexer with the root i2c bus
and your bus segment devices with those virtual i2c buses.

Regards,
-Frank