Hi,
I have no idea whether this is something DietPi needs or not but people seem to be pretty happy about it.
Seems to be like a native driver for RaspiCam.
http://www.linux-projects.org/modules/news/article.php?storyid=150
I have an original raspicam and it works without this driver. so no clue what exactly this thing does.
could be worth a look.