config MHI_BUS_EP tristate "Modem Host Interface (MHI) bus Endpoint implementation" help Bus driver for MHI protocol. Modem Host Interface (MHI) is a communication protocol used by a host processor to control and communicate a modem device over a high speed peripheral bus or shared memory. MHI_BUS_EP implements the MHI protocol for the endpoint devices, such as SDX55 modem connected to the host machine over PCIe.