BeagleBone

A really helpful post about device tree overlays – good explanation and example work
https://github.com/jadonk/validation-scripts/tree/master/test-capemgr

device tree compiler
https://eewiki.net/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-upgradedistro”device-tree-compiler’package

Adafruit’s explanation of DTO’s and the last page is an example of using an SPI overlay, which was what i was looking for! In Engineering, theirs no point reinventing the wheel!  – https://learn.adafruit.com/introduction-to-the-beaglebone-black-device-tree/overview

SPIDEV example – http://lxr.free-electrons.com/source/drivers/spi/spidev.c

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