Furquan Shaikh 699838c0c1 i2c: Add option for calling board-specific functions before and after every i2c transaction ...

This change adds a new config option CONFIG_I2C_XFER_CALLBACK that
makes i2c_xfer callback into board-provided functions before the start
and after the end of every I2C transaction. This can be used by boards
to implement any I2C device-specific quirks e.g. requiring minimum
bus-free time between every I2C transaction when the slave device
cannot actually do clock stretching.

BUG=b:73147310
BRANCH=None
TEST=make -j buildall

Change-Id: I452de4f22a81ffd97ca4944e1b940a3537637df9
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://chromium-review.googlesource.com/956934
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>

2018-03-20 19:30:14 -07:00

10 KiB

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