if (mode & SPI_RX_DUAL) return 0; break; case 4: if (mode & SPI_RX_QUAD) return 0; break; }return -EOPNOTSUPP; }bool zynq_qspi_mem_exec_op(struct spi_slave *slave, const struct spi_mem_op *op) { if (zynq_qspi_check_buswidth(slave, op->cmd.buswidth)) ...