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Krane/Jacuzzi need a 100KHz SMBus port for battery, in addition to the
existing two i2c ports.
This CL adds a bit-bang driver that supports i2c/smbus bit-banging
through a set of pre-defined gpio pins.
BUG=b:138161741,b:138415463
TEST=On a reworked jacuzzi (battery i2c connected to other gpios),
1) `battery` shows reasonable output (this verifies i2c_readN,
i2c_read_string)
2) `i2cscan` works for port 3 (bitbang port)
3) `cutoff` (verifies i2c_writeN)
4) `i2ctest` stress test
BRANCH=master
Change-Id: I78020e5c51707c3d9f0fd54f2c299e2f29cabe2f
Signed-off-by: Ting Shen <phoenixshen@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1765110
Reviewed-by: Alexandru M Stan <amstan@chromium.org>
Commit-Queue: Ting Shen <phoenixshen@chromium.org>
Tested-by: Ting Shen <phoenixshen@chromium.org>
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