centos man page for spi_register_master

SPI_REGISTER_MASTER(9)					  Serial Peripheral Interface (S				    SPI_REGISTER_MASTER(9)

NAME
       spi_register_master - register SPI master controller

SYNOPSIS
       int spi_register_master(struct spi_master * master);

ARGUMENTS
       master
	   initialized master, originally from spi_alloc_master

CONTEXT
       can sleep

DESCRIPTION
       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.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						    SPI_REGISTER_MASTER(9)