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Instead of forcing bridges to implement empty callbacks make them all optional. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Thierry Reding <treding@nvidia.com> (cherry picked from commit c8a3b2ae07130042682bc8e031bcfbae3754463d) Change-Id: Id37cbb6114e69957dfd6b72c8bd7b66dcc6f0590 Signed-off-by: Mark Yao <mark.yao@rock-chips.com>