[PATCH 7/9] OPP: Add dev_pm_opp_get_interconnect_bw()

[Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>]

Add dev_pm_opp_get_interconnect_bw() to read the interconnect
bandwidth values for a given OPP.

Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
---
 drivers/opp/of.c       | 36 ++++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h |  7 +++++++
 2 files changed, 43 insertions(+)

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 7af0ddec936b..6a5eecaaf8c1 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -777,3 +777,39 @@ struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
 	return of_node_get(opp->np);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node);
+
+/**
+ * dev_pm_opp_get_interconnect_bw() - Get the interconnect bandwidth for the opp
+ * @opp:	opp containing the bandwidth values
+ * @pathname:	name of the interconnect path for the bandwidth values
+ * @avgbw:	Pointer for the value to hold the average BW defined for the OPP
+ * @peakbw:	Pointer for the value to hold the peak BW defined for the OPP
+ *
+ * Return: Negative value on error or 0 on success
+ */
+int dev_pm_opp_get_interconnect_bw(struct dev_pm_opp *opp,
+		const char *pathname, u64 *avgbw, u64 *peakbw)
+{
+	char name[NAME_MAX];
+	struct property *prop;
+	int count;
+
+	if (IS_ERR_OR_NULL(opp))
+		return -ENOENT;
+
+	snprintf(name, NAME_MAX, "opp-interconnect-bw-%s", pathname);
+	prop = of_find_property(opp->np, name, NULL);
+
+	if (!prop)
+		return -ENOENT;
+
+	count = of_property_count_u64_elems(opp->np, name);
+	if (count != 2)
+		return -EINVAL;
+
+	of_property_read_u64_index(opp->np, name, 0, avgbw);
+	of_property_read_u64_index(opp->np, name, 0, peakbw);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_interconnect_bw);
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 099b31960dec..70e49e259d0e 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -301,6 +301,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpuma
 struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
 struct dev_pm_opp *of_dev_pm_opp_find_required_opp(struct device *dev, struct device_node *np);
 struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp);
+int dev_pm_opp_get_interconnect_bw(struct dev_pm_opp *opp, const char *pathname, u64 *avgbw, u64 *peakbw);
 #else
 static inline int dev_pm_opp_of_add_table(struct device *dev)
 {
@@ -343,6 +344,12 @@ static inline struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
 {
 	return NULL;
 }
+
+static inline int dev_pm_opp_get_interconnect_bw(struct dev_pm_opp *opp, const char *pathname,
+		u64 *avgbw, u64 *peakbw)
+{
+	return -ENOTSUPP;
+}
 #endif
 
 #endif		/* __LINUX_OPP_H__ */
-- 
2.18.0