I have an embedded Linux system (F&S PicoComA5) that has shipped with a pre-configured Linux Kernel + buildroot system.
By default, only one SPI device is pre-configured, appearing in the system as /dev/spi0.0
Now on my board, I have a second SPI devices, so I need to select another 'CS' line, and it should appear as /dev/spi0.1
Where in the kernel or buildroot do I configure these parameters to make this second SPI device appear?
EDIT: in arch/arm/arm-mvf/arch-picocom.c, the board-specific init code, the SPI devices are initialized, I hope to find the way to make it work there!