menuconfig FIELDBUS_DEV tristate "Fieldbus Device Support" help Support for Fieldbus Device Adapters. Fieldbus device (client) adapters allow data exchange with a PLC aka. "Fieldbus Controller" over a fieldbus (Profinet, FLNet, etc.) They are typically used when a Linux device wants to expose itself as an actuator, motor, console light, switch, etc. over the fieldbus. This framework is designed to provide a generic interface to Fieldbus Devices from both the Linux Kernel and the userspace. If unsure, say no. source "drivers/staging/fieldbus/anybuss/Kconfig"