spi_alloc_device — Allocate a new SPI device
| struct spi_device * spi_alloc_device ( | struct spi_master * master ); | 
   Allows a driver to allocate and initialize a spi_device without
   registering it immediately.  This allows a driver to directly
   fill the spi_device with device parameters before calling
   spi_add_device on it.
   
   Caller is responsible to call spi_add_device on the returned
   spi_device structure to add it to the SPI master.  If the caller
   needs to discard the spi_device without adding it, then it should
   call spi_dev_put on it.