Bluetooth support for Silicon Labs EFR32XX <chzfmx@...>

Hi ,
    My zephyr version is 2.5.0, and the board is EFR32_radio_brd4180a from Silicon Labs. 
    When I try to compile and run the Bluetooth routine (samples/blutooth/peripheral_hr), the serial port prints: "Bluetooth init failed (err -19)  , No HCI driver regsitered", and then I retrieved Issues#17005: . The conclusion is that it is almost difficult to provide Bluetooth support for Silicon Labs chips unless they provide library or register descriptions, so I would like to ask if there are any new developments or plans for the future.Thanks!