[U-Boot-Users] PATCH: Support for multiple I2C controllers + new command structure
bwarren at qstreams.com
Mon May 22 19:25:54 CEST 2006
Let's try this again - attached is a patch which provides command
support for multiple I2C devices in U-Boot. This isn't meant as a final
submission, more as a design review. The features:
1. Include new 'i2c' command (based on USB implementation) using
CONFIG_I2C_CMD_TREE. Note - this should probably be a bit in
CONFIG_COMMANDS, but right now I'm more interested in feedback for the
2. Allow multiple buses by defining CONFIG_I2C_MULTI_BUS. Note that
this is only available under the new 'i2c' command mentioned in bullet
3. Allow by-passing of devices when probing a bus by defining
CFG_I2C_MULTI_NOPROBES. This array contains a list for each bus, where
lists are delimited by 0xff. I'm sticking with this implementation for
now because I can't come up with anything better.
Not implemented yet:
- support for 10-bit addresses
- integration of new command into CONFIG_COMMANDS
- Different approach for no-probe list, as requested by Wolfgang Denk.
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.
Please have a look and let me know what you think. Any comments on
style as well as substance are welcomed.
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