STRUCT SPI_MASTER - Online Linux Manual Page

Section : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Serial Peripheral Interface (S
NAMEstruct_spi_master − interface to SPI master controller
SYNOPSISstruct spi_master { struct device dev; s16 bus_num; u16 num_chipselect; u16 dma_alignment; u16 mode_bits; u16 flags; #define SPI_MASTER_HALF_DUPLEX BIT(0) #define SPI_MASTER_NO_RX BIT(1) #define SPI_MASTER_NO_TX BIT(2) int (* setup) (struct spi_device *spi); int (* transfer) (struct spi_device *spi,struct spi_message *mesg); void (* cleanup) (struct spi_device *spi); };
MEMBERSdev device interface to this driver bus_num board−specific (and often SOC−specific) identifier for a given SPI controller​. num_chipselect 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​. dma_alignment SPI controller constraint on DMA buffers alignment​. mode_bits flags understood by this controller driver flags other constraints relevant to this driver setup 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​. transfer adds a message to the controller´s transfer queue​. cleanup frees controller−specific state
DESCRIPTIONEach SPI master controller can communicate with one or more spi_device 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​.
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