linux-kernel - [PATCH v1 1/9] opp: add new helper API dev_pm_opp_set

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Message-ID: <20250410174010.31588-2-quic_ptalari@quicinc.com>
Date: Thu, 10 Apr 2025 23:10:02 +0530
From: Praveen Talari <quic_ptalari@...cinc.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby
	<jirislaby@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Viresh Kumar
	<vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd
	<sboyd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Praveen Talari
	<quic_ptalari@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-pm@...r.kernel.org>
CC: <psodagud@...cinc.com>, <djaggi@...cinc.com>, <quic_msavaliy@...cinc.com>,
        <quic_vtanuku@...cinc.com>, <quic_arandive@...cinc.com>,
        <quic_mnaresh@...cinc.com>, <quic_shazhuss@...cinc.com>,
        Nikunj Kela
	<quic_nkela@...cinc.com>
Subject: [PATCH v1 1/9] opp: add new helper API dev_pm_opp_set_level()

From: Nikunj Kela <quic_nkela@...cinc.com>

To configure a device to a specific performance level, consumer drivers
currently need to determine the OPP based on the exact level and then
set it, resulting in code duplication across drivers.

The new helper API, dev_pm_opp_set_level(), addresses this issue by
providing a streamlined method for consumer drivers to find and set the
OPP based on the desired performance level, thereby eliminating
redundancy.

Co-developed-by: Praveen Talari <quic_ptalari@...cinc.com>
Signed-off-by: Praveen Talari <quic_ptalari@...cinc.com>
Signed-off-by: Nikunj Kela <quic_nkela@...cinc.com>
---
 drivers/opp/core.c     | 22 ++++++++++++++++++++++
 include/linux/pm_opp.h |  6 ++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 73e9a3b2f29b..a9bca9502f71 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -3151,3 +3151,25 @@ void dev_pm_opp_remove_table(struct device *dev)
 	dev_pm_opp_put_opp_table(opp_table);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
+
+/*
+ * dev_pm_opp_set_level() - Configure device for a level
+ * @dev: device for which we do this operation
+ * @level: level to set to
+ *
+ * Return: 0 on success, a negative error number otherwise.
+ */
+int dev_pm_opp_set_level(struct device *dev, unsigned int level)
+{
+	struct dev_pm_opp *opp = dev_pm_opp_find_level_exact(dev, level);
+	int ret;
+
+	if (IS_ERR(opp))
+		return -EINVAL;
+
+	ret = dev_pm_opp_set_opp(dev, opp);
+	dev_pm_opp_put(opp);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_set_level);
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index c247317aae38..c17271947f83 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -196,6 +196,7 @@ int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
 void dev_pm_opp_remove_table(struct device *dev);
 void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask);
 int dev_pm_opp_sync_regulators(struct device *dev);
+int dev_pm_opp_set_level(struct device *dev, unsigned int level);
 #else
 static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
 {
@@ -454,6 +455,11 @@ static inline int dev_pm_opp_sync_regulators(struct device *dev)
 	return -EOPNOTSUPP;
 }
 
+static inline int dev_pm_opp_set_level(struct device *dev, unsigned int level)
+{
+	return -EOPNOTSUPP;
+}
+
 #endif		/* CONFIG_PM_OPP */
 
 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
-- 
2.17.1