mxic_spi_data_xfer
ret = mxic_spi_data_xfer(mxic, cmd, NULL, op->cmd.nbytes);
ret = mxic_spi_data_xfer(mxic, addr, NULL, op->addr.nbytes);
ret = mxic_spi_data_xfer(mxic, NULL, NULL, op->dummy.nbytes);
ret = mxic_spi_data_xfer(mxic,
ret = mxic_spi_data_xfer(mxic, t->tx_buf, t->rx_buf, t->len);