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For open-drain output pins, this would allow us to easily check pin state without changing it to input. BUG=chrome-os-partner:26483 TEST=Toggle output level and read it back. BRANCH=None Change-Id: Ia7ceb7a221a8f0cfec9b19a5c5baae4d5441150f Signed-off-by: Vic Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/207060 Reviewed-by: Randall Spangler <rspangler@chromium.org>