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Add PD communication enable flag. When disabled, the ports will still detect source/sink connect and disconnect, and will provide VBUS to a device, but will not send or respond to any PD communication. Use the CONFIG_USB_PD_COMM_ENABLED macro to define the default state of PD communication enabled flag which may vary board to board. BUG=chrome-os-partner:31125 BRANCH=none TEST=load onto samus. use "pd 0 enable" console command to toggle between enabled and disabled. when disabled, test that plugging in a zinger only gets you the default VBUS 5V and that no negotiation takes place. when enabled, test that plugging in zinger negotiates successfully. Change-Id: I78ac3091f12d9699b19647be48ab7b6f434f5d7d Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/211045
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit