(1) Functional Grip
In general it is important to have a functional grip to hit good shots. The grip should be functional to create club head speed. It is very important that your hands have the ability to bend.
Check out what Padraig Harrington says on his YouTube channel about:
A proper Grip
(2) Set-Up Driver
In general it is important to hit your driver in an upwards motion and use your functional grip with low hands.