Say Y here if you want to have control over RF switches found on many WiFi and Bluetooth cards. To compile this driver as a module, choose M here: the module will be called rfkill.
This options enable controlling radio transmitters connected to voltage regulator using the regulator framework. To compile this driver as a module, choose M here: the module will be called rfkill-regulator.
If you say yes here you get support of a generic gpio RFKILL driver. The platform should fill in the appropriate fields in the rfkill_gpio_platform_data structure and pass that to the driver.