[PATCH 1/2] opp: Not all power-domains are scalable

[Viresh Kumar]

A device may have multiple power-domains and not all of them may be
scalable (i.e. support performance states). But
dev_pm_opp_attach_genpd() doesn't take that into account currently.

Fix that by not verifying the names argument with "power-domain-names"
DT property and finding the index into the required-opps array. The
names argument will anyway get verified later on when we call
dev_pm_domain_attach_by_name().

Fixes: 6319aee10e53 ("opp: Attach genpds to devices from within OPP core")
Reported-by: Rajendra Nayak <rna...@codeaurora.org>
Tested-by: Rajendra Nayak <rna...@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.ku...@linaro.org>
---
 drivers/opp/core.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 2958cc7bbb58..4e2a81698cd2 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1788,12 +1788,15 @@ static void _opp_detach_genpd(struct opp_table 
*opp_table)
  *
  * This helper needs to be called once with a list of all genpd to attach.
  * Otherwise the original device structure will be used instead by the OPP 
core.
+ *
+ * The order of entries in the names array must match the order in which
+ * "required-opps" are added in DT.
  */
 struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char 
**names)
 {
        struct opp_table *opp_table;
        struct device *virt_dev;
-       int index, ret = -EINVAL;
+       int index = 0, ret = -EINVAL;
        const char **name = names;
 
        opp_table = dev_pm_opp_get_opp_table(dev);
@@ -1819,14 +1822,6 @@ struct opp_table *dev_pm_opp_attach_genpd(struct device 
*dev, const char **names
                goto unlock;
 
        while (*name) {
-               index = of_property_match_string(dev->of_node,
-                                                "power-domain-names", *name);
-               if (index < 0) {
-                       dev_err(dev, "Failed to find power domain: %s (%d)\n",
-                               *name, index);
-                       goto err;
-               }
-
                if (index >= opp_table->required_opp_count) {
                        dev_err(dev, "Index can't be greater than 
required-opp-count - 1, %s (%d : %d)\n",
                                *name, opp_table->required_opp_count, index);
@@ -1847,6 +1842,7 @@ struct opp_table *dev_pm_opp_attach_genpd(struct device 
*dev, const char **names
                }
 
                opp_table->genpd_virt_devs[index] = virt_dev;
+               index++;
                name++;
        }
 
-- 
2.21.0.rc0.269.g1a574e7a288b