How i can disable GPIO request for Push Buttons(PB1 PB2 PB3 PB4 on BF548)

HI

I have a BF548 ezkit andI am using the latest trunk kernel/uboot/filesystem ( 2010R1 ).

How i can disable GPIO request for Push Buttons(PB1 PB2 PB3 PB4 on BF548) from uClinux kernel ?