I have question regarding SPI interface in th linux kernel. I want access SPI device in the user space as well as kernel space.

I found information in the below URL about SPI system, which helped me understand SPI system better.
https://wiki.st.com/stm32mpu/wiki/SPI_overview

I want to keep the spidev interface to access SPI device in the user space and I also want to implement protocol driver in the kernel space.

My query is can spidev driver(userspace) and protocol driver(kernel space) co-exist? If yes, can I access spidev driver and protocol driver simulataneously?



Thanks in advance.


Kind Regards,
Lubna

I guess yes, the protocol driver will create some other device(s), like /dev/spi_protocol and works on /dev/spidev. But obviously you can hardly run two or more drivers on the same device simultaneously. So I don't really understand what do you want to achieve.

@pan64 Thanks for the reply.

So what I am trying to achieve is, I want to implement a protocol driver to access SPI device in the kernel space.
But I also have to use software applications in the user space[ E.g Skyworks API for Network time synchronization] which are heavily depend on spidev driver interface.



A dumb question: Instead of creating a new device node[like /dev/spi_protocol] in the protocol driver, can I just intercept spidev driver [E.g /dev/spidev1.0] in the kernel protocol driver to communicate SPI device?

yes. you can do that obviously, the problem is when you access the same device from several different apps simultaneously. But without details hard to say anything.