other versions
| SPI_ALLOC_MASTER(9) | Serial Peripheral Interface (S | SPI_ALLOC_MASTER(9) |
NAME¶
spi_alloc_master - allocate SPI master controller
SYNOPSIS¶
struct spi_master * spi_alloc_master(struct device * dev, unsigned size);
ARGUMENTS¶
dev
the controller, possibly using the platform_bus
size
how much zeroed driver-private data to allocate; the
pointer to this memory is in the driver_data field of the returned device,
accessible with spi_master_get_devdata.
CONTEXT¶
can sleep
DESCRIPTION¶
This call is used only by SPI master controller drivers, which are the only ones directly touching chip registers. It's how they allocate an spi_master structure, prior to calling spi_register_master.
This must be called from context that can sleep.
The caller is responsible for assigning the bus number and initializing the master's methods before calling spi_register_master; and (after errors adding the device) calling spi_master_put to prevent a memory leak.
RETURN¶
the SPI master structure on success, else NULL.
COPYRIGHT¶
| January 2017 | Kernel Hackers Manual 4.8. |