diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index 9d7bec3bbbcf..1cc0d9ab358d 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -2156,3 +2156,63 @@ int dev_pm_opp_of_add_table(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
 #endif
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+
+static int opp_summary_show(struct seq_file *s, void *data)
+{
+	struct list_head *lists = (struct list_head *)s->private;
+	struct opp_table *opp_table;
+	struct dev_pm_opp *opp;
+
+	mutex_lock(&opp_table_lock);
+
+	seq_puts(s, " device                rate(Hz)    target(uV)    min(uV)    max(uV)\n");
+	seq_puts(s, "-------------------------------------------------------------------\n");
+
+	list_for_each_entry_rcu(opp_table, lists, node) {
+		seq_printf(s, " %s\n", opp_table->dentry_name);
+		list_for_each_entry(opp, &opp_table->opp_list, node) {
+			seq_printf(s, "%31lu %12lu %11lu %11lu\n",
+				   opp->rate,
+				   opp->u_volt,
+				   opp->u_volt_min,
+				   opp->u_volt_max);
+		}
+	}
+
+	mutex_unlock(&opp_table_lock);
+
+	return 0;
+}
+
+static int opp_summary_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, opp_summary_show, inode->i_private);
+}
+
+static const struct file_operations opp_summary_fops = {
+	.open		= opp_summary_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int __init opp_debug_init(void)
+{
+	struct dentry *parent, *d;
+
+	parent = debugfs_lookup("opp", NULL);
+	if (!parent)
+		return -ENOMEM;
+
+	d = debugfs_create_file("opp_summary", 0444, parent, &opp_tables,
+				&opp_summary_fops);
+	if (!d)
+		return -ENOMEM;
+
+	return 0;
+}
+late_initcall(opp_debug_init);
+#endif