[U-Boot-Users] [PATCH 1/2] Add support for multiple I2C buses

[Ben Warren]

Hello,

Attached is a patch providing support for multiple I2C buses at the
command level.  The second part of the patch includes an implementation
for the MPC834x CPU and MPC8349EMDS board.  Note - this does not include
support for 10-bit addresses.  That's too profound a change to include
here...  Hopefully this addresses concerns with my previous attempts.

Overview:

1. Include new 'i2c' command (based on USB implementation) using
CONFIG_I2C_CMD_TREE.  Note - I opted to not use the last remaining CMD
bit in 'include/cmd_confdefs.h'.

2. Allow multiple buses by defining CONFIG_I2C_MULTI_BUS.  Note that
this is only available under the new 'i2c' command mentioned in bullet
1.  

3. Allow by-passing of devices when probing a bus by defining
CFG_I2C_MULTI_NOPROBES.  This is an array of bus-device pairs that will
be skipped by the 'i2c probe' command. 

CHANGELOG:
        Added new 'i2c' master command for all I2C interaction.  This is
conditionally compiled with CONFIG_I2C_CMD_TREE.  New commands added for
setting I2C bus speed as well as changing the active bus if the board
has more than one bus (conditionally compiled with
CONFIG_I2C_MULTI_BUS).  Added a list of devices to ignore when probing
the buses when more than one bus is present.  Updated README.

regards,
Ben
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