The provided helpers can be used for the respective callback functions
in |struct drm_driver|.

v4:
	* cleanups from checkpatch.pl
v2:
	* documentation fixes
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20190508082630.15116-4-tzimmermann@suse.deSigned-off-by: Gerd Hoffmann <kraxel@redhat.com>