SMMU_CR0ACK
error = smmu_write_ack(sc, SMMU_CR0, SMMU_CR0ACK, reg);
error = smmu_write_ack(sc, SMMU_CR0, SMMU_CR0ACK, reg);
error = smmu_write_ack(sc, SMMU_CR0, SMMU_CR0ACK, reg);
error = smmu_write_ack(sc, SMMU_CR0, SMMU_CR0ACK, reg);
error = smmu_write_ack(sc, SMMU_CR0, SMMU_CR0ACK, reg);
error = smmu_write_ack(sc, SMMU_CR0, SMMU_CR0ACK, reg);