devfreq_add_device
devfreq = devfreq_add_device(dev, profile, governor_name, data);
EXPORT_SYMBOL(devfreq_add_device);
priv->devfreq_dram = devfreq_add_device(dev, &priv->profile,
devfreq = devfreq_add_device(hba->dev,
struct devfreq *devfreq_add_device(struct device *dev,