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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 c8a3b2ae07)
Change-Id: Id37cbb6114e69957dfd6b72c8bd7b66dcc6f0590
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>