UR_PULL_MASK
u32 pull = FIELD_GET(UR_PULL_MASK, conf);
FIELD_MODIFY(UR_PULL_MASK, conf, UR_PULL_DIS);
FIELD_MODIFY(UR_PULL_MASK, conf, UR_PULL_UP);
FIELD_MODIFY(UR_PULL_MASK, conf, UR_PULL_DOWN);