OPP: Provide a simple implementation to configure multiple clocks

This provides a simple implementation to configure multiple clocks for a
device.

Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 4675a00..0c5b12e 100644 (file)
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -843,6 +843,40 @@ _opp_config_clk_single(struct device *dev, struct opp_table *opp_table,
        return ret;
 }
 
+/*
+ * Simple implementation for configuring multiple clocks. Configure clocks in
+ * the order in which they are present in the array while scaling up.
+ */
+int dev_pm_opp_config_clks_simple(struct device *dev,
+               struct opp_table *opp_table, struct dev_pm_opp *opp, void *data,
+               bool scaling_down)
+{
+       int ret, i;
+
+       if (scaling_down) {
+               for (i = opp_table->clk_count - 1; i >= 0; i--) {
+                       ret = clk_set_rate(opp_table->clks[i], opp->rates[i]);
+                       if (ret) {
+                               dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
+                                       ret);
+                               return ret;
+                       }
+               }
+       } else {
+               for (i = 0; i < opp_table->clk_count; i++) {
+                       ret = clk_set_rate(opp_table->clks[i], opp->rates[i]);
+                       if (ret) {
+                               dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
+                                       ret);
+                               return ret;
+                       }
+               }
+       }
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_config_clks_simple);
+
 static int _opp_config_regulator_single(struct device *dev,
                        struct dev_pm_opp *old_opp, struct dev_pm_opp *new_opp,
                        struct regulator **regulators, unsigned int count)

diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 104151d..683e6ba 100644 (file)
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -159,6 +159,9 @@ int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb
 int dev_pm_opp_set_config(struct device *dev, struct dev_pm_opp_config *config);
 int devm_pm_opp_set_config(struct device *dev, struct dev_pm_opp_config *config);
 void dev_pm_opp_clear_config(int token);
+int dev_pm_opp_config_clks_simple(struct device *dev,
+               struct opp_table *opp_table, struct dev_pm_opp *opp, void *data,
+               bool scaling_down);
 
 struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table, struct opp_table *dst_table, struct dev_pm_opp *src_opp);
 int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct opp_table *dst_table, unsigned int pstate);
@@ -342,6 +345,13 @@ static inline int devm_pm_opp_set_config(struct device *dev, struct dev_pm_opp_c
 
 static inline void dev_pm_opp_clear_config(int token) {}
 
+static inline int dev_pm_opp_config_clks_simple(struct device *dev,
+               struct opp_table *opp_table, struct dev_pm_opp *opp, void *data,
+               bool scaling_down)
+{
+       return -EOPNOTSUPP;
+}
+
 static inline struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table,
                                struct opp_table *dst_table, struct dev_pm_opp *src_opp)
 {