Refusal to provide password set to become criminal offence in Ireland

> Security sources said the person refusing to surrender their password would have to be a suspect in a crime and trying to obstruct the investigation of that core offence before they would be convicted over the password refusal.

What does suspect mean? Is it up to the police officer or up to a judge? Is it the case the police can come to you, grab your phone, ask for your password and assuming you refuse, they put you 5 years in jail? Or is this closer to the police asking a judge to grant permission to compell you to give your password. I guess what I am asking is, is there due process here?