linux-kernel - [PATCH 3/5] OPP: Add dev_pm_opp_get

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Date:   Tue, 31 May 2022 15:40:02 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Keerthy <j-keerthy@...com>, Dave Gerlach <d-gerlach@...com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] OPP: Add dev_pm_opp_get_supplies()

We already have an API for getting voltage information for a single
regulator, dev_pm_opp_get_voltage(), but there is nothing available for
multiple regulator case.

This patch adds a new API, dev_pm_opp_get_supplies(), to get all
information related to the supplies for an OPP.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/opp/core.c     | 22 ++++++++++++++++++++++
 include/linux/pm_opp.h |  7 +++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 2f76442845be..58ce1240e808 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -113,6 +113,28 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage);
 
+/**
+ * dev_pm_opp_get_supplies() - Gets the supply information corresponding to an opp
+ * @opp:	opp for which voltage has to be returned for
+ * @supplies:	Placeholder for copying the supply information.
+ *
+ * Return: negative error number on failure, 0 otherwise on success after setting @supplies.
+ *
+ * This can be used for devices with any number of power supplies. The caller must
+ * ensure the @supplies array must contain space for each regulator.
+ */
+int dev_pm_opp_get_supplies(struct dev_pm_opp *opp, struct dev_pm_opp_supply *supplies)
+{
+	if (IS_ERR_OR_NULL(opp) || !supplies) {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return -EINVAL;
+	}
+
+	memcpy(supplies, opp->supplies, sizeof(*supplies) * opp->opp_table->regulator_count);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_supplies);
+
 /**
  * dev_pm_opp_get_power() - Gets the power corresponding to an opp
  * @opp:	opp for which power has to be returned for
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 7e7986106274..185503aab64d 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -128,6 +128,8 @@ void dev_pm_opp_put_opp_table(struct opp_table *opp_table);
 
 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
 
+int dev_pm_opp_get_supplies(struct dev_pm_opp *opp, struct dev_pm_opp_supply *supplies);
+
 unsigned long dev_pm_opp_get_power(struct dev_pm_opp *opp);
 
 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
@@ -216,6 +218,11 @@ static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
 	return 0;
 }
 
+static inline int dev_pm_opp_get_supplies(struct dev_pm_opp *opp, struct dev_pm_opp_supply *supplies)
+{
+	return -EOPNOTSUPP;
+}
+
 static inline unsigned long dev_pm_opp_get_power(struct dev_pm_opp *opp)
 {
 	return 0;
-- 
2.31.1.272.g89b43f80a514