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spi_master Struct Reference

#include <spi.h>

List of all members.


Detailed Description

struct spi_master - interface to SPI master controller : device interface to this driver : board-specific (and often SOC-specific) identifier for a given SPI controller. : chipselects are used to distinguish individual SPI slaves, and are numbered from zero to num_chipselects. each slave has a chipselect signal, but it's common that not every chipselect is connected to a slave. : updates the device mode and clocking records used by a device's SPI controller; protocol code may call this. This must fail if an unrecognized or unsupported mode is requested. It's always safe to call this unless transfers are pending on the device whose settings are being modified. : adds a message to the controller's transfer queue. : frees controller-specific state

Each SPI master controller can communicate with one or more children. These make a small bus, sharing MOSI, MISO and SCK signals but not chip select signals. Each device may be configured to use a different clock rate, since those shared signals are ignored unless the chip is selected.

The driver for an SPI controller manages access to those devices through a queue of spi_message transactions, copying data between CPU memory and an SPI slave device. For each such message it queues, it calls the message's completion function when the transaction completes.

Definition at line 224 of file spi.h.


Public Attributes

s16 bus_num
void(* cleanup )(struct spi_device *spi)
struct device dev
u16 num_chipselect
int(* setup )(struct spi_device *spi)
int(* transfer )(struct spi_device *spi, struct spi_message *mesg)

The documentation for this struct was generated from the following file:

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