support SPI bus connection

modulename: ad525x_dpot-spi.ko

configname: CONFIG_AD525X_DPOT_SPI

Linux Kernel Configuration
└─>Device Drivers
└─>Misc devices
└─>support SPI bus connection
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
Say Y here if you have a digital potentiometers hooked to an SPI bus.

If unsure, say N (but it's safe to say "Y").

To compile this driver as a module, choose M here: the
module will be called ad525x_dpot-spi.

source code: