opp: Expose of-node's name in debugfs

It is difficult to find which OPPs are active at the moment, specially
if there are multiple OPPs with same frequency available in the device
tree (controlled by supported hardware feature).

Expose name of the DT node to find out the exact OPP.

While at it, also expose level field.

Reported-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
index 596c185..b5f2f9f 100644
--- a/drivers/opp/debugfs.c
+++ b/drivers/opp/debugfs.c
@@ -10,6 +10,7 @@
 #include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/of.h>
 #include <linux/init.h>
 #include <linux/limits.h>
 #include <linux/slab.h>
@@ -131,9 +132,13 @@ void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table)
 	debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend);
 	debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate);
 	debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate);
+	debugfs_create_u32("level", S_IRUGO, d, &opp->level);
 	debugfs_create_ulong("clock_latency_ns", S_IRUGO, d,
 			     &opp->clock_latency_ns);
 
+	opp->of_name = of_node_full_name(opp->np);
+	debugfs_create_str("of_name", S_IRUGO, d, (char **)&opp->of_name);
+
 	opp_debug_create_supplies(opp, opp_table, d);
 	opp_debug_create_bw(opp, opp_table, d);