1SPI_ALLOC_MASTER(9)     Serial Peripheral Interface (S     SPI_ALLOC_MASTER(9)
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NAME

6       spi_alloc_master - allocate SPI master controller
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SYNOPSIS

9       struct spi_master * spi_alloc_master(struct device * dev,
10                                            unsigned size);
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ARGUMENTS

13       dev
14           the controller, possibly using the platform_bus
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16       size
17           how much zeroed driver-private data to allocate; the pointer to
18           this memory is in the driver_data field of the returned device,
19           accessible with spi_master_get_devdata.
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CONTEXT

22       can sleep
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DESCRIPTION

25       This call is used only by SPI master controller drivers, which are the
26       only ones directly touching chip registers. It's how they allocate an
27       spi_master structure, prior to calling spi_register_master.
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29       This must be called from context that can sleep. It returns the SPI
30       master structure on success, else NULL.
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32       The caller is responsible for assigning the bus number and initializing
33       the master's methods before calling spi_register_master; and (after
34       errors adding the device) calling spi_master_put and kfree to prevent a
35       memory leak.
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38Kernel Hackers Manual 3.10         June 2019               SPI_ALLOC_MASTER(9)
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