How to add SPI interface in Linux for AM335x (BeagleBone)?

Question

linux

Good day!
When assembling the core for a custom board based on the AM335x core (BeagleBone), it became necessary to use the SPI bus. How to connect the bus to work with an external microcontroller?

Answer 1

Fix dts file. Look here for example:
stackoverflow.com/questions/21276090/beaglebone-bl...
hipstercircuits.com/enable-spi-with-device-tree-on...

Answer 2

In total, to add an SPI port, you need to do the following:
- fix DTS files in one form or another according to the example https://github.com/osuosl/fedpkg-kernel/blob/maste... or any other;
- be sure to enable Device drivers->SPI support->User mode SPI driver support - nowhere is it written that you need to enable this one in addition to McSPI driver for OMAP;
- SPI0 - referred to as spidev1.
In general, it works fine after these changes.