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According to the USB-C spec, when a debug accessory is identified, we may optionally establish USB PD communication over CC. Some DTS partners (eg. servo_v4) expect us to speak PD, so let's make it so. There is no need for special ACCESSORY states, these do not exist in the PD spec. BRANCH=servo BUG=chromium:737755,b:65837068 TEST=On scarlet, attach servo_v4 and verify scarlet charges. Also verify EC and cr50 consoles are available through servo_v4. Change-Id: I59d1ca50b4766509eccf38562cdf926578138585 Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/693294 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly