MSPI driver device config read_cmd vs mspi xfr packet cmd

[scottwcpg]

Hi, I am planning a MSPI driver for a SPI controller supporting full-duplex, dual, and quad I/O. I have looked over the MSPI documentation, header file, and the current drivers. I am not clear about the difference between struct mspi_xfer_packet cmd and struct mspi_dev_cfg read_cmd. I expected the driver would use struct mspi_xfr_packet cmd plus io_mode and cmd_length from struct mspi_dev_cfg to know how to transmit the command. What is the purpose of read_cmd and write_cmd in struct mspi_dev_cfg?