spi_alloc_master — allocate SPI master controller
struct spi_master * spi_alloc_master ( | struct device * dev, |
unsigned size); |
devthe 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.
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.