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Change USBC port 1 PD comparator to use window mode, which uses COMP1's non-inverting input for COMP2's non-inverting input (pin PA1). This allows us to free up pin PA3 and PA7 for the next build. BUG=chrome-os-partner:31215 BRANCH=none TEST=make sure PD communication works on both ports by plugging in a zinger. Then set gpioset USB_C0_REF_PD_ODL 1, to change comparator voltage to 1.5 V and verify that neither port works. Then gpioset USB_C0_REF_PD_ODL 0 and gpioset USB_C1_REF_PD_ODL 1 and make sure that both ports work. This proves that both ports are using USB_C0_REF_PD_ODL as the comparator value (PA1). Change-Id: I6e1e5606af43196b04c84417552002b063aa4134 Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/211416 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