NetBSD includes a machine dependent SPI (Serial Peripheral Interface) bus subsystem, and several different machine-independent SPI device drivers.
Your system may support additional machine-dependent SPI devices. Consult your system's
intro(4) for additional information.
SPI is a 4-wire synchronous full-duplex serial bus. Some systems provide support for Microwire, which is Philips' name for a strict subset of SPI, with more rigidly defined signaling. Therefore, Microwire devices are also supported by the SPI framework.
Note that when referencing SPI devices in a
config(1) file, the ‘slave' must be provided, as SPI lacks any way to automatically probe devices.