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
Kernel Hackers Manual 4.8.                 January 2017                       SPI_ALLOC_MASTER(9)