opp: Don't print an error if required-opps is missing

The 'required-opps' property is considered optional, hence remove
the pr_err() in of_parse_required_opp() when we find the property is
missing.
While at it, also fix the return value of
of_get_required_opp_performance_state() when of_parse_required_opp()
fails, return a -ENODEV instead of the -EINVAL.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index d298e38..9bdabad 100644 (file)
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -95,15 +95,7 @@ static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table,
 static struct device_node *of_parse_required_opp(struct device_node *np,
                                                 int index)
 {
-       struct device_node *required_np;
-
-       required_np = of_parse_phandle(np, "required-opps", index);
-       if (unlikely(!required_np)) {
-               pr_err("%s: Unable to parse required-opps: %pOF, index: %d\n",
-                      __func__, np, index);
-       }
-
-       return required_np;
+       return of_parse_phandle(np, "required-opps", index);
 }
 
 /* The caller must call dev_pm_opp_put_opp_table() after the table is used */
@@ -1327,7 +1319,7 @@ int of_get_required_opp_performance_state(struct device_node *np, int index)
 
        required_np = of_parse_required_opp(np, index);
        if (!required_np)
-               return -EINVAL;
+               return -ENODEV;
 
        opp_table = _find_table_of_opp_np(required_np);
        if (IS_ERR(opp_table)) {