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The two chips work together, so let's teach them how to tell master from slave. After identification, the two chips shake hands through the two sync signals. BUG=None TEST=Disable handshake on master. See slave fail. Vice versa. BRANCH=None Change-Id: Idb6a56128f608dd2ee5c453f75abea475fe1779f Signed-off-by: Vic (Chun-Ju) Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/195395 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>