Yes, I've seen so many other players do the same thing. It's not Cristiano Ronaldo that's the first player to do it. Aaron Hunt did it in the match between Werder Bremen v FC Nürnberg (Bundesliga 2014). He was awarded a penalty when he falls down in the box while having possession. But Hunt refuses to take the penalty, accepting that there was no contact. After a replay, it was proved that Hunt tripped himself.