For simple devices probably user space is just fine. i.e. https://www.kernel.org/doc/Documentation/spi/spidev https://www.kernel.org/doc/Documentation/spi/spide

For simple devices probably user space is just fine. i.e. https://www.kernel.org/doc/Documentation/spi/spidev https://www.kernel.org/doc/Documentation/spi/spidev Usually only if you need an IRQ or something does it require kernel space.