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In order to transition output drivers to using the struct tegra_output as a helper rather than midlayer, make this callback optional. Instead drivers should implement the equivalent as part of ->mode_fixup(). For the conversion to atomic modesetting a new callback ->atomic_check() should be implemented that updates the display controller's state with the corresponding parent clock, rate and shift clock divider. Signed-off-by: Thierry Reding <treding@nvidia.com>