support SPI bus connection

modulename: adt7316-spi.ko
configname: CONFIG_ADT7316_SPI

Linux Kernel Configuration
└─> Device Drivers
└─> Staging drivers
└─> IIO staging drivers
└─> Analog digital bi-direction converters
└─> SPI support
└─> support SPI bus connection

Say yes here to build SPI bus support for Analog Devices ADT7316/7/8
and ADT7516/7/9.

To compile this driver as a module, choose M here: the module will
be called adt7316_spi.

source code: