drm: Add TODO item for requesting memory regions

Add a TODO item about requesting  memory regions for each driver. The
current DRM drivers don't do this consistently.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220125091222.21457-6-tzimmermann@suse.de

Documentation/gpu/todo.rst

@@ -467,6 +467,21 @@ Contact: Thomas Zimmermann <tzimmermann@suse.de>
 
 Level: Intermediate
 
+Request memory regions in all drivers
+-------------------------------------
+
+Go through all drivers and add code to request the memory regions that the
+driver uses. This requires adding calls to request_mem_region(),
+pci_request_region() or similar functions. Use helpers for managed cleanup
+where possible.
+
+Drivers are pretty bad at doing this and there used to be conflicts among
+DRM and fbdev drivers. Still, it's the correct thing to do.
+
+Contact: Thomas Zimmermann <tzimmermann@suse.de>
+
+Level: Starter
+
 
 Core refactorings
 =================