spi_register_master — register SPI master controller
int spi_register_master ( | struct spi_master * master); |
SPI master controllers connect to their drivers using some non-SPI bus,
such as the platform bus. The final stage of probe in that code
includes calling spi_register_master to hook up to this SPI bus glue.
SPI controllers use board specific (often SOC specific) bus numbers, and board-specific addressing for SPI devices combines those numbers with chip select numbers. Since SPI does not directly support dynamic device identification, boards need configuration tables telling which chip is at which address.
This must be called from context that can sleep. It returns zero on
success, else a negative error code (dropping the master's refcount).
After a successful return, the caller is responsible for calling
spi_unregister_master.