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When building sandbox_defconfig with CONFIG_DM_VIDEO=n a link time error occurs: in function `sandbox_serial_pending': drivers/serial/sandbox.c:101: undefined reference to `video_sync_all' video_sync_all() is only defined if we have CONFIG_DM_VIDEO=y. Calling this function in a serial driver looks quite hackish but at least let's add the missing build constraint. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Simon Glass <sjg@chromium.org>