linux-kernel - [PATCH 1/3] opp: core: add regulators enable and disable

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Date:   Mon,  8 Jul 2019 16:11:38 +0200
From:   k.konieczny@...tner.samsung.com
To:     k.konieczny@...tner.samsung.com
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Mark Rutland <mark.rutland@....com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Viresh Kumar <vireshk@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: [PATCH 1/3] opp: core: add regulators enable and disable

From: Kamil Konieczny <k.konieczny@...tner.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@...tner.samsung.com>
---
 drivers/opp/core.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 0e7703fe733f..947cac452854 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1580,8 +1580,19 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
 	if (ret)
 		goto free_regulators;
 
+	for (i = 0; i < opp_table->regulator_count; i++) {
+		ret = regulator_enable(opp_table->regulators[i]);
+		if (ret < 0)
+			goto disable;
+	}
+
 	return opp_table;
 
+disable:
+	while (i != 0)
+		regulator_disable(opp_table->regulators[--i]);
+
+	i = opp_table->regulator_count;
 free_regulators:
 	while (i != 0)
 		regulator_put(opp_table->regulators[--i]);
@@ -1609,6 +1620,8 @@ 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--)
+		regulator_disable(opp_table->regulators[i]);
 
 	for (i = opp_table->regulator_count - 1; i >= 0; i--)
 		regulator_put(opp_table->regulators[i]);
-- 
2.22.0