HC_CONTROL_HOT_JOIN_CTRL
reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE | HC_CONTROL_HOT_JOIN_CTRL);
reg_clear(HC_CONTROL, HC_CONTROL_HOT_JOIN_CTRL);
reg_set(HC_CONTROL, HC_CONTROL_HOT_JOIN_CTRL);
reg_set(HC_CONTROL, HC_CONTROL_HOT_JOIN_CTRL);
HC_CONTROL_BUS_ENABLE | (hci->master.hotjoin ? 0 : HC_CONTROL_HOT_JOIN_CTRL));