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

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NAMEspi_setup − setup SPI mode and clock rate

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SYNOPSISint spi_setup(struct spi_device * spi);

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ARGUMENTSspi the device whose settings are being modified

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CONTEXTcan sleep, and no requests are queued to the device

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DESCRIPTIONSPI protocol drivers may need to update the transfer mode if the device doesn´t work with its default​. They may likewise need to update clock rates or word sizes from initial values​. This function changes those settings, and must be called from a context that can sleep​. Except for SPI_CS_HIGH, which takes effect immediately, the changes take effect the next time the device is selected and data is transferred to or from it​. When this function returns, the spi device is deselected​. Note that this call will fail if the protocol driver specifies an option that the underlying controller or its driver does not support​. For example, not all hardware supports wire transfers using nine bit words, LSB−first wire encoding, or active−high chipselects​.

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