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

[Kamil Konieczny <k.konieczny@partner.samsung.com>]

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.konieczny@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