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

6       spi_setup - setup SPI mode and clock rate
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SYNOPSIS

9       int spi_setup(struct spi_device * spi);
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ARGUMENTS

12       spi
13           the device whose settings are being modified
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CONTEXT

16       can sleep, and no requests are queued to the device
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DESCRIPTION

19       SPI protocol drivers may need to update the transfer mode if the device
20       doesn´t work with its default. They may likewise need to update clock
21       rates or word sizes from initial values. This function changes those
22       settings, and must be called from a context that can sleep. Except for
23       SPI_CS_HIGH, which takes effect immediately, the changes take effect
24       the next time the device is selected and data is transferred to or from
25       it. When this function returns, the spi device is deselected.
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27       Note that this call will fail if the protocol driver specifies an
28       option that the underlying controller or its driver does not support.
29       For example, not all hardware supports wire transfers using nine bit
30       words, LSB-first wire encoding, or active-high chipselects.
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33Kernel Hackers Manual 2.6.         June 2019                      SPI_SETUP(9)
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