[PATCH v2 1/4] opp: core: add regulators enable and disable

[Kamil Konieczny]

Add enable regulators to dev_pm_opp_set_regulators() and disable
regulators to dev_pm_opp_put_regulators(). This prepares for
converting exynos-bus devfreq driver to use dev_pm_opp_set_rate().

Signed-off-by: Kamil Konieczny <k.koniec...@partner.samsung.com>
--
Changes in v2:

- move regulator enable and disable into loop

---
 drivers/opp/core.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 0e7703fe733f..069c5cf8827e 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1570,6 +1570,10 @@ struct opp_table *dev_pm_opp_set_regulators(struct 
device *dev,
                        goto free_regulators;
                }
 
+               ret = regulator_enable(reg);
+               if (ret < 0)
+                       goto disable;
+
                opp_table->regulators[i] = reg;
        }
 
@@ -1582,9 +1586,15 @@ struct opp_table *dev_pm_opp_set_regulators(struct 
device *dev,
 
        return opp_table;
 
+disable:
+       regulator_put(reg);
+       --i;
+
 free_regulators:
-       while (i != 0)
-               regulator_put(opp_table->regulators[--i]);
+       for (; i >= 0; --i) {
+               regulator_disable(opp_table->regulators[i]);
+               regulator_put(opp_table->regulators[i]);
+       }
 
        kfree(opp_table->regulators);
        opp_table->regulators = NULL;
@@ -1610,8 +1620,10 @@ void dev_pm_opp_put_regulators(struct opp_table 
*opp_table)
        /* Make sure there are no concurrent readers while updating opp_table */
        WARN_ON(!list_empty(&opp_table->opp_list));
 
-       for (i = opp_table->regulator_count - 1; i >= 0; i--)
+       for (i = opp_table->regulator_count - 1; i >= 0; i--) {
+               regulator_disable(opp_table->regulators[i]);
                regulator_put(opp_table->regulators[i]);
+       }
 
        _free_set_opp_data(opp_table);
 
-- 
2.22.0