Au1550/Au12x0 SPI Controller

modulename: spi-au1550.ko

and/or

au1550_spi.ko

configname: CONFIG_SPI_AU1550

Linux Kernel Configuration
└─>Device Drivers
└─>SPI support
└─>Au1550/Au12x0 SPI Controller
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
If you say yes to this option, support will be included for the
Au1550 SPI controller (may also work with Au1200,Au1210,Au1250).

This driver can also be built as a module. If so, the module
will be called au1550_spi.

source code:
drivers/spi/au1550_spi.c