@@ -1443,6 +1443,38 @@ int of_get_required_opp_performance_state(struct device_node *np, int index)
}
EXPORT_SYMBOL_GPL(of_get_required_opp_performance_state);
+/**
+ * dev_pm_opp_of_has_required_opp - Find out if a required-opps exists.
+ * @dev: The device to investigate.
+ *
+ * Returns true if the device's node has a "operating-points-v2" property and if
+ * the corresponding node for the opp-table describes opp nodes that uses the
+ * "required-opps" property.
+ *
+ * Return: True if a required-opps is present, else false.
+ */
+bool dev_pm_opp_of_has_required_opp(struct device *dev)
+{
+ struct device_node *opp_np, *np;
+ int count;
+
+ opp_np = _opp_of_get_opp_desc_node(dev->of_node, 0);
+ if (!opp_np)
+ return false;
+
+ np = of_get_next_available_child(opp_np, NULL);
+ of_node_put(opp_np);
+ if (!np) {
+ dev_warn(dev, "Empty OPP table\n");
+ return false;
+ }
+
+ count = of_count_phandle_with_args(np, "required-opps", NULL);
+ of_node_put(np);
+
+ return count > 0;
+}
+
/**
* 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
@@ -476,6 +476,7 @@ 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 device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp);
int of_get_required_opp_performance_state(struct device_node *np, int index);
+bool dev_pm_opp_of_has_required_opp(struct device *dev);
int dev_pm_opp_of_find_icc_paths(struct device *dev, struct opp_table *opp_table);
int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus);
int dev_pm_opp_calc_power(struct device *dev, unsigned long *uW,
@@ -554,6 +555,11 @@ static inline int of_get_required_opp_performance_state(struct device_node *np,
return -EOPNOTSUPP;
}
+static inline bool dev_pm_opp_of_has_required_opp(struct device *dev)
+{
+ return false;
+}
+
static inline int dev_pm_opp_of_find_icc_paths(struct device *dev, struct opp_table *opp_table)
{
return -EOPNOTSUPP;
As being shown from a subsequent change to genpd, it's useful to understand if a device's OF node has an OPP-table described and whether it contains OPP nodes that makes use of the required-opps DT property. For this reason, let's introduce an OPP OF helper function called dev_pm_opp_of_has_required_opp(). Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> --- drivers/opp/of.c | 32 ++++++++++++++++++++++++++++++++ include/linux/pm_opp.h | 6 ++++++ 2 files changed, 38 insertions(+)