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Where is linux/spi/spi-engine.h, included by ad4630c?

Category: Software

The Linux IIO driver at the Analog Devices Github, ad4630.c has at line 29:

#include <linux/spi/spi-engine.h>

Where is that file located?  It is not in my Xilinx 2021.2 5.10 kernel, and I can't seem to find it on the Analog Devices Github either.