opp: Allow required-opps to be used for non genpd use cases

Don't limit required_opp_table to genpd only. One possible use case is
cpufreq based devfreq governor, which can use required-opps property to
derive devfreq from cpufreq.

Though the OPP core still doesn't support non-genpd required-opps in
_set_required_opps().

Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
[ Viresh: Update _set_required_opps() to check for genpd ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index e366218..b335c07 100644 (file)
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -893,6 +893,16 @@ static int _set_required_opps(struct device *dev,
        if (!required_opp_tables)
                return 0;
 
+       /*
+        * We only support genpd's OPPs in the "required-opps" for now, as we
+        * don't know much about other use cases. Error out if the required OPP
+        * doesn't belong to a genpd.
+        */
+       if (unlikely(!required_opp_tables[0]->is_genpd)) {
+               dev_err(dev, "required-opps don't belong to a genpd\n");
+               return -ENOENT;
+       }
+
        /* required-opps not fully initialized yet */
        if (lazy_linking_pending(opp_table))
                return -EBUSY;

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index aa75a1c..d298e38 100644 (file)
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -197,21 +197,8 @@ static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
                required_opp_tables[i] = _find_table_of_opp_np(required_np);
                of_node_put(required_np);
 
-               if (IS_ERR(required_opp_tables[i])) {
+               if (IS_ERR(required_opp_tables[i]))
                        lazy = true;
-                       continue;
-               }
-
-               /*
-                * We only support genpd's OPPs in the "required-opps" for now,
-                * as we don't know how much about other cases. Error out if the
-                * required OPP doesn't belong to a genpd.
-                */
-               if (!required_opp_tables[i]->is_genpd) {
-                       dev_err(dev, "required-opp doesn't belong to genpd: %pOF\n",
-                               required_np);
-                       goto free_required_tables;
-               }
        }
 
        /* Let's do the linking later on */
@@ -379,13 +366,6 @@ static void lazy_link_required_opp_table(struct opp_table *new_table)
        struct dev_pm_opp *opp;
        int i, ret;
 
-       /*
-        * We only support genpd's OPPs in the "required-opps" for now,
-        * as we don't know much about other cases.
-        */
-       if (!new_table->is_genpd)
-               return;
-
        mutex_lock(&opp_table_lock);
 
        list_for_each_entry_safe(opp_table, temp, &lazy_opp_tables, lazy) {
@@ -873,7 +853,7 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
                return ERR_PTR(-ENOMEM);
 
        ret = _read_opp_key(new_opp, opp_table, np, &rate_not_available);
-       if (ret < 0 && !opp_table->is_genpd) {
+       if (ret < 0) {
                dev_err(dev, "%s: opp key field not found\n", __func__);
                goto free_opp;
        }