PM / OPP: add dev_pm_opp_is_turbo() helper

Add dev_pm_opp_is_turbo() helper to verify if an opp is to be used only
for turbo mode or not.

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index bb52fae..cab7ba5 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -30,6 +30,8 @@
 
 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
 
+bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
+
 int dev_pm_opp_get_opp_count(struct device *dev);
 unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
 
@@ -63,6 +65,11 @@
 	return 0;
 }
 
+static inline bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
+{
+	return false;
+}
+
 static inline int dev_pm_opp_get_opp_count(struct device *dev)
 {
 	return 0;