stbenn opened a new pull request, #15987:
URL: https://github.com/apache/nuttx/pull/15987
Adds a device ID to `ramtron_initialize`, which is stored in the
`ramtron_dev_s` structure. This ID is used when calling SPI_SELECT to board
specific logic to allow chip select on the SPI bus.
This change is NOT backwards compatible, as it changes the function
signature of `ramtron_initialize`.
This implementation is based on the handling of chip select in
`nuttx/drivers/mtd/sst26.c:sst26_initialize_spi()`.
Additional Changes:
- Add MB85RS64V to ramtron supported parts list.
*Note: Please adhere to [Contributing
Guidelines](https://github.com/apache/nuttx/blob/master/CONTRIBUTING.md).*
## Summary
This change makes the ramtron driver compatible with boards that have more
than one memory device per SPI peripheral. Its implementation is based on other
mtd drivers such as `sst26.c`.
Before this change the ramtron driver exclusively called `SPIDEV_FLASH(0)`.
With this change, the SPI device ID is provided during initialization and used
with `SPIDEV_FLASH` calls in the driver. This allows control over chip select
in board specific code.
## Impact
This change **breaks backwards compatibility:** it changes the function
signature of `ramtron_initialize` from `ramtron_initialize(FAR struct spi_dev_s
*)` to `ramtron_initialize(FAR struct spi_dev_s *, uint16_t)`.
## Testing
Target used for testing is a custom board:
- CPU: STM32H753BIT6
- FRAM and FLASH on SPI4
- FRAM chip: MB85RS256B
- FLASH chip: MX25L25645G
Build Host:
- Ubuntu 24.04
- Arm GNU Toolchain 13.3.rel1 x86_64 arm-none-eabi
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