linux-kernel - [PATCH v3 1/9] opp: add new helper API dev_pm_opp_set

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Message-ID: <20250502031018.1292-2-quic_ptalari@quicinc.com>
Date: Fri, 2 May 2025 08:40:10 +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>
Subject: [PATCH v3 1/9] opp: add new helper API dev_pm_opp_set_level()

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.

Signed-off-by: Praveen Talari <quic_ptalari@...cinc.com>

v2 -> v3
- moved function defination to pm_opp.h from core.c with inline
- updated return value with IS_ERR(opp)

v1 -> v2
- reorder sequence of tags in commit text
---
 include/linux/pm_opp.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index e7b5c602c92f..31ed8a7b554e 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -197,6 +197,28 @@ 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);
+
+/*
+ * 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 non-zero value if there is an error otherwise.
+ */
+static inline 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 IS_ERR(opp);
+
+	ret = dev_pm_opp_set_opp(dev, opp);
+	dev_pm_opp_put(opp);
+
+	return ret;
+}
+
 #else
 static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
 {
@@ -461,6 +483,11 @@ 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