He 'devoted' [='dedicated'] his life/time 'to' helping the poor. = He 'devoted himself to' helping the poor. [=he used his time, energy, etc., to help the poor]
The author's 'devoted' [='loyal, faithful'] readers have been eagerly waiting for the new book.
Some of the money they raise will be 'devoted to' repairing the church's roof.
(..) Will we still go out to dinner, and movies... That's not really my thing. Try to keep an open mind. If you agree to be my submissive, I will be devoted to you. This is what I want. And I want it with you. Why do I have to sleep in here? We slept in the same bed last night. Like normal people. (..)2015 Fifty Shades of Grey