make_dev cdevsw_add (Is there anyone that could answer this ?)

Hello (again)! I would kindly request explanation on how are cdevsw_add and make_dev related ? Maybe short example also with focus on cdevsw_add. Thing is i do not understand the function of cdevsw_add when i have make_dev. Also if there is any real good document that describes most of cdev

make_dev cdevsw_add

Hello! I would kindly request explanation on how are cdevsw_add and make_dev related ? Maybe short example also with focus on cdevsw_add. Thing is i do not understand the function of cdevsw_add when i have make_dev. Also if there is any real good document that describes most of cdev related