BYT_PULL_ASSIGN_MASK
switch (conf0 & BYT_PULL_ASSIGN_MASK) {
pull = conf & BYT_PULL_ASSIGN_MASK;
conf &= ~BYT_PULL_ASSIGN_MASK;
conf &= ~BYT_PULL_ASSIGN_MASK;
conf &= ~BYT_PULL_ASSIGN_MASK;