OPP: Add support for parsing the 'opp-level' property

Now that the OPP bindings are updated to include an optional
'opp-level' property, add support to parse it from device tree
and store it as part of dev_pm_opp structure.
Also add and export an helper 'dev_pm_opp_get_level()' that can be
used to get the level value read from device tree when present.

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index e5507ad..90b78a1 100644 (file)
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -131,6 +131,24 @@ unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
 EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
 
 /**
+ * dev_pm_opp_get_level() - Gets the level corresponding to an available opp
+ * @opp:       opp for which level value has to be returned for
+ *
+ * Return: level read from device tree corresponding to the opp, else
+ * return 0.
+ */
+unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
+{
+       if (IS_ERR_OR_NULL(opp) || !opp->available) {
+               pr_err("%s: Invalid parameters\n", __func__);
+               return 0;
+       }
+
+       return opp->level;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_level);
+
+/**
  * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
  * @opp: opp for which turbo mode is being verified
  *

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 06f0f63..1779f2c 100644 (file)
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -594,6 +594,8 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
                new_opp->rate = (unsigned long)rate;
        }
 
+       of_property_read_u32(np, "opp-level", &new_opp->level);
+
        /* Check if the OPP supports hardware's hierarchy of versions or not */
        if (!_opp_is_supported(dev, opp_table, np)) {
                dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate);

diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index e24d814..4458175 100644 (file)
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -60,6 +60,7 @@ extern struct list_head opp_tables;
  * @suspend:   true if suspend OPP
  * @pstate: Device's power domain's performance state.
  * @rate:      Frequency in hertz
+ * @level:     Performance level
  * @supplies:  Power supplies voltage/current values
  * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
  *             frequency from any other OPP's frequency.
@@ -80,6 +81,7 @@ struct dev_pm_opp {
        bool suspend;
        unsigned int pstate;
        unsigned long rate;
+       unsigned int level;
 
        struct dev_pm_opp_supply *supplies;
 

diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 0a2a88e..473d2c7 100644 (file)
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -86,6 +86,8 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
 
 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
 
+unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp);
+
 bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
 
 int dev_pm_opp_get_opp_count(struct device *dev);
@@ -157,6 +159,11 @@ static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
        return 0;
 }
 
+static inline unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
+{
+       return 0;
+}
+
 static inline bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
 {
        return false;