i2c-ocores: add some device tree documentation
This puts some documentation for the device tree configuration at the head of the driver file. Hopefully this can get moved to a common area for this type of documentation at a later date; unfortunately, there isn't really such a place in the kernel tree at this time. Furthermore, the regstep and clock-frequency parameters are really bus parameters and should probably be passed to the driver in a better way. Consider that a TODO. Signed-off-by: NJonas Bonn <jonas@southpole.se> Signed-off-by: NBen Dooks <ben-linux@fluff.org>
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