PM / OPP: Implement dev_pm_opp_get_of_node()

This adds a new helper to let the power domain drivers to access
opp->np, so that they can read platform specific properties from the
node.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 6380ec3d695b..de41e68b780f 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -727,3 +727,22 @@ put_opp_table:
         return opp;
 }
 EXPORT_SYMBOL_GPL(of_dev_pm_opp_find_required_opp);
+
+/**
+ * dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp
+ * @opp:        opp for which DT node has to be returned for
+ *
+ * Return: DT node corresponding to the opp, else 0 on success.
+ *
+ * The caller needs to put the node with of_node_put() after using it.
+ */
+struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
+{
+        if (IS_ERR_OR_NULL(opp)) {
+                pr_err("%s: Invalid parameters\n", __func__);
+                return NULL;
+        }
+
+        return of_node_get(opp->np);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node);