drm/bridge: Make (pre/post) enable/disable callbacks optional

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>
This commit is contained in:
Laurent Pinchart 2016-02-26 11:51:06 +02:00 • committed by Thierry Reding
commit c8a3b2ae07
2 changed files with 16 additions and 4 deletions