I’m trying to enable all the SPI Ports on my raspberry pi 4 (as mentioned in the datasheet).

I already enable the SPI interfaces over the raspi-config tool but that only gives me spi0.0 and spi0.1 when i check /sys/bus/spi/devices.

I found this post where someone edited the config.txt to get the SPI’s (somewhat) enabled. Is this the best way to do this? Or is there a way of doing this using C or Python? Is it it even possible to run 5 SPI in parallel?

Is there better documentation than the short datasheet?

I’m running raspbian with an RT Kernel Patch.

Update: I was able to spi0.0 spi0.1 spi1.0 spi2.0 spi3.0 by putting in /boot/config.txt

dtoverlay=spi0-cs
dtoverlay=spi1-1cs
dtoverlay=spi2-1cs
dtoverlay=spi3-1cs
dtoverlay=spi4-1cs

however spi-4 doesn’t work, it’s just not enabled