I just bought the iPhone 12 mini. I've had the MagSafe puck since Christmas. I understand that the mini can only charge at 12w via MagSafe. I also understand that this what at least some of the iPhone 12s are limited to unless you use the 20w charger from Apple. Do I need the 20w charger to get 12w into the mini, or will any basic charger (putting out at least 12w) work?