YT921X_VLAN_CTRLb_STP_ID_M
masks[1] = YT921X_VLAN_CTRLb_STP_ID_M;
#define YT921X_VLAN_CTRLb_STP_ID(x) FIELD_PREP(YT921X_VLAN_CTRLb_STP_ID_M, (x))