SPI Devices

Reference Link :
https://www.kernel.org/doc/Documentation/spi/spi-summary https://source.codeaurora.org/quic/la/kernel/msm-3.18/tree/drivers/spi/spi-qup.c?h=aosp/android-3.18 http://events.linuxfoundation.org/sites/events/files/slides/Groking%20the%20Linux%20SPI%20Subsystem.pdf