Name
spi_add_device — 
     Add spi_device allocated with spi_alloc_device
 
Arguments
- spi
- 
     spi_device to register
     
Description
   Companion function to spi_alloc_device.  Devices allocated with
   spi_alloc_device can be added onto the spi bus with this function.
Return
   0 on success; negative errno on failure