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On both Reef and Gru there are INA (shunt bus voltage monitor) ICs connected to the Cr50 I2C master bus. The use case for these chips is in a lab setting using case closed debugging. Power to the INA chips is controlled by a separate Cr50 gpio signal. By default, the INAs are powered off and the I2C master bus is not connected. A function ina_connect() is provided which needs to be called prior to attempting to access the INAs via I2C. BRANCH=none BUG=chrome-os-partner:57059 TEST=manual Tested both Reef and Gru. Verified that console command 'ccd ina on|off' works as expected and that can repeatedly read registers on the INA using the following command "i2cxfer r16 0 0x40 0". Read 0x2771 [10097] which is the default value. In addition wrote register 14 (bits 15:1 are writeable) and verified the value was able to read the value back which was written. Change-Id: I670f7897555dae29642264531599dc4471c52bbd Signed-off-by: Scott <scollyer@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/394168 Commit-Ready: Scott Collyer <scollyer@chromium.org> Tested-by: Scott Collyer <scollyer@chromium.org> Reviewed-by: Bill Richardson <wfrichar@chromium.org>