> +static int h4_probe(struct serdev_device *serdev) > +{ > + struct h4_device *h4dev; > + struct hci_uart *hu; > + int ret; > + u32 speed; > + > + h4dev = devm_kzalloc(&serdev->dev, sizeof(*h4dev), GFP_KERNEL); > + if (!h4dev) > + return -ENOMEM; > + > + hu = &h4dev->hu; > + > + hu->serdev = serdev; > + ret = device_property_read_u32(&serdev->dev, "max-speed", &speed); > + if (!ret) { > + /* h4 does not have any baudrate handling: > + * user oper speed from the start > + */ > + hu->init_speed = speed; > + hu->oper_speed = speed; > + } > + > + serdev_device_set_drvdata(serdev, h4dev); > + dev_info(&serdev->dev, "h4 device registered.\n"); It is considered bad practice to spam the logs like this. dev_dbg(). > + > + return hci_uart_register_device(hu, &h4p); > +} > + > +static void h4_remove(struct serdev_device *serdev) > +{ > + struct h4_device *h4dev = serdev_device_get_drvdata(serdev); > + > + dev_info(&serdev->dev, "h4 device unregistered.\n"); dev_dbg(). Andrew