Operation tested on Broadwell (Wildcat Point) MacBookPro12,1.
Attachment also tested on Kaby Lake (Sunrise Point) Pixelbook.
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**This is important because it's a prerequisite for supporting the input devices on modern Apple MacBooks.**
(On the MacBookPro12,1, both USB and SPI are supported, but on everything else, SPI is the *only* way to get keyboard and touchpad input!)