spi_res_add (9)      - add a spi_res to the spi_message
spi_res_alloc (9)    - allocate a spi resource that is life-cycle managed dur...
spi_res_free (9)     - free an spi resource
spi_res_release (9)  - release all spi resources for this message
SPI_result_code_string (3) - return error code as string
struct_spi_res (9)   - spi resource management structure