SPI_ALLOC_MASTER - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Serial Peripheral Interface (S

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NAMEspi_alloc_master − allocate SPI master controller

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SYNOPSISstruct spi_master * spi_alloc_master(struct device * dev, unsigned size);

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ARGUMENTSdev 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​.

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CONTEXTcan sleep

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DESCRIPTIONThis 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​. It returns the SPI master structure on success, else NULL​. 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​.

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