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



NAME
       spi_setup - setup SPI mode and clock rate

SYNOPSIS
       int spi_setup(struct spi_device * spi);

ARGUMENTS
       spi
           the device whose settings are being modified

CONTEXT
       can sleep, and no requests are queued to the device

DESCRIPTION
       SPI 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.

RETURN
       zero on success, else a negative error code.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                              SPI_SETUP(9)