of_devfreq_cooling_register
cooling = of_devfreq_cooling_register(dev->of_node, devfreq);
gpu->cooling = of_devfreq_cooling_register(gpu->pdev->dev.of_node, df->devfreq);
EXPORT_SYMBOL_GPL(of_devfreq_cooling_register);
return of_devfreq_cooling_register(NULL, df);
of_devfreq_cooling_register(struct device_node *np, struct devfreq *df);