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SPI(4)			 BSD Kernel Interfaces Manual			SPI(4)

NAME
     spi — introduction to machine-independent SPI bus support and drivers

SYNOPSIS
     spi* at mainbus?

     Other attachments are machine-dependent and will depend on the bus topol‐
     ogy of your system.  See intro(4) for your system for more information.

DESCRIPTION
     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.	Con‐
     sult 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.

HARDWARE
     NetBSD includes the following machine-independent SPI drivers

	   m25p	      STMicroelectronics M25P family of NOR flash devices.

	   tm121temp  Texas Instruments TMP121 temperature sensor.

SEE ALSO
     m25p(4), tm121temp(4)

HISTORY
     The machine-independent SPI framework was written by Garrett D'Amore for
     the Champaign-Urbana Community Wireless Network Project (CUWiN), and
     appeared in NetBSD 4.0.

BSD				October 9, 2006				   BSD

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