Here is the second attempt for initial portion of multibus/multiadapter I2C support.
This includes a set of common files, all drivers in drivers/i2c and all boards affected by these changes (config files, board files, and lib_xx files.)
There is an illustrative example of multiadapter multibus I2C config in MPC8548CDS.h config file (#if 0'd.) Definitions in that example are bogus so please don't expect it to work. It will compile though...
This set also includes big rework for soft_i2c.c that makes it template version that allows up to 4 bitbanged adapters. This number can be reduced/increased; 4 is arbitrary chosen value. I'm not a CPP guru so I did not find a way to make a version without a limit. Sure I could add additional configuration variable for this limit but it is one more variable and resulting soft_i2c.c would be much uglier.
The general rule for multi-adapter controllers (fsl_i2c, mxc_i2c, etc.) is that all defines for the first controller do not have any number in their names, the second one has "2" and so on. That allows for compatibility with existing code. All existing defaults are kept.
I did test-compile all ARM and PPC boards. Unfortunately I have never worked with m68k, mips, blackfin so I don't have toolchains for those to do test builds.
The only board that failed to compile was SIMPC8313.h that fails to link NAND bootstrap with "NAND bootstrap too big" but it has nothing to do with new I2C code; it also fails without my patches.
All patches are against today's u-boot-i2c.git.
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