in mtk.c [120:129]
static void mtk_remove(struct serdev_device *serdev)
{
struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);
struct mtk_data *data = gnss_serial_get_drvdata(gserial);
gnss_serial_deregister(gserial);
if (data->vbackup)
regulator_disable(data->vbackup);
gnss_serial_free(gserial);
}