linux-imx

#

# SPI driver configuration

#

menuconfig SPI

    bool "SPI support"

    depends on HAS_IOMEM

    help

      The "Serial Peripheral Interface" is a low level synchronous

      protocol.  Chips that support SPI can have data transfer rates

      up to several tens of Mbit/sec.  Chips are addressed with a

      controller and a chipselect.  Most SPI slaves don't support

      dynamic device discovery; some are even write-only or read-only.

​

      SPI is widely used by microcontrollers to talk with sensors,

      eeprom and flash memory, codecs and various other controller

      chips, analog to digital (and d-to-a) converters, and more.

      MMC and SD cards can be accessed using SPI protocol; and for

      DataFlash cards used in MMC sockets, SPI must always be used.

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      SPI is one of a family of similar protocols using a four wire

      interface (select, clock, data in, data out) including Microwire

      (half duplex), SSP, SSI, and PSP.  This driver framework should

      work with most such devices and controllers.

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if SPI

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config SPI_DEBUG

    bool "Debug support for SPI drivers"

    depends on DEBUG_KERNEL

    help

      Say "yes" to enable debug messaging (like dev_dbg and pr_debug),

      sysfs, and debugfs support in SPI controller and protocol drivers.

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#

# MASTER side ... talking to discrete SPI slave chips including microcontrollers

#

​

config SPI_MASTER

#   bool "SPI Master Support"

    bool

    default SPI

    help

      If your system has an master-capable SPI controller (which

      provides the clock and chipselect), you can enable that

      controller and the protocol drivers for the SPI slave chips

      that are connected.

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if SPI_MASTER

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config SPI_MEM

    bool "SPI memory extension"

    help

      Enable this option if you want to enable the SPI memory extension.

      This extension is meant to simplify interaction with SPI memories

      by providing a high-level interface to send memory-like commands.

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comment "SPI Master Controller Drivers"

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config SPI_ALTERA

    tristate "Altera SPI Controller"

    help

      This is the driver for the Altera SPI Controller.

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