in serial.c [200:210]
void gnss_serial_deregister(struct gnss_serial *gserial)
{
struct serdev_device *serdev = gserial->serdev;
gnss_deregister_device(gserial->gdev);
if (IS_ENABLED(CONFIG_PM))
pm_runtime_disable(&serdev->dev);
else
gnss_serial_set_power(gserial, GNSS_SERIAL_OFF);
}