in sirf.c [382:393]
static int sirf_parse_dt(struct serdev_device *serdev)
{
struct sirf_data *data = serdev_device_get_drvdata(serdev);
struct device_node *node = serdev->dev.of_node;
u32 speed = 9600;
of_property_read_u32(node, "current-speed", &speed);
data->speed = speed;
return 0;
}