I am trying to use an SPI bus between HPS and FPGA in order to communicate with a module (which is not directly connected to the HPS). The communication path looks like this:
[HPS] <===(Lightweight Bridge)===> [SPI (Soft IP, inside FPGA)] <===(SPI)===>[Sensor Module]
From what I understand, I should open /dev/mem and do mmap() in order to access the Soft IP's registers. It seems so challenging and I don't have much time.
But when a peripheral chip/module is connected to the HPS directly, with drivers and device tree settings, Linux can see it as a device and it appears under /dev/ folder. So, we can use read-write-ioctl system calls to easily communicate with it.
My question is, is there any way to make this SPI Soft IP appear in Linux's /dev/ file for the ease of communication using system calls? Other than this, I am a newbie in this subject and if any of the above sounds silly, a warning is always appreciated.
Thanks in advance.