| struct_spi_board_info(9) - phpMan
STRUCT SPI_BOARD_INF(9) Serial Peripheral Interface (S STRUCT SPI_BOARD_INF(9)
NAME
struct_spi_board_info - board-specific template for a SPI device
SYNOPSIS
struct spi_board_info {
char modalias[SPI_NAME_SIZE];
const void * platform_data;
void * controller_data;
int irq;
u32 max_speed_hz;
u16 bus_num;
u16 chip_select;
u16 mode;
};
MEMBERS
modalias[SPI_NAME_SIZE]
Initializes spi_device.modalias; identifies the driver.
platform_data
Initializes spi_device.platform_data; the particular data stored there is
driver-specific.
controller_data
Initializes spi_device.controller_data; some controllers need hints about hardware
setup, e.g. for DMA.
irq
Initializes spi_device.irq; depends on how the board is wired.
max_speed_hz
Initializes spi_device.max_speed_hz; based on limits from the chip datasheet and
board-specific signal quality issues.
bus_num
Identifies which spi_master parents the spi_device; unused by spi_new_device, and
otherwise depends on board wiring.
chip_select
Initializes spi_device.chip_select; depends on how the board is wired.
mode
Initializes spi_device.mode; based on the chip datasheet, board wiring (some devices
support both 3WIRE and standard modes), and possibly presence of an inverter in the
chipselect path.
DESCRIPTION
When adding new SPI devices to the device tree, these structures serve as a partial device
template. They hold information which can't always be determined by drivers. Information
that probe can establish (such as the default transfer wordsize) is not included here.
These structures are used in two places. Their primary role is to be stored in tables of
board-specific device descriptors, which are declared early in board initialization and
then used (much later) to populate a controller's device tree after the that controller's
driver initializes. A secondary (and atypical) role is as a parameter to spi_new_device
call, which happens after those controller drivers are active in some dynamic board
configuration models.
COPYRIGHT
Kernel Hackers Manual 4.8. January 2017 STRUCT SPI_BOARD_INF(9)
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