linux-kernel - [PATCH v3 09/12] opp: Add devm_pm_opp_attach

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Date:   Mon, 18 Jan 2021 03:55:21 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        Yangtao Li <tiny.windzz@...il.com>,
        Matt Merhar <mattmerhar@...tonmail.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH v3 09/12] opp: Add devm_pm_opp_attach_genpd

Add resource-managed version of dev_pm_opp_attach_genpd().

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/opp/core.c     | 35 +++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h |  8 ++++++++
 2 files changed, 43 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 8e0d2193fd5f..49419ab9fbb4 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2891,3 +2891,38 @@ devm_pm_opp_register_set_opp_helper(struct device *dev,
 	return opp_table;
 }
 EXPORT_SYMBOL_GPL(devm_pm_opp_register_set_opp_helper);
+
+static void devm_pm_opp_detach_genpd(void *data)
+{
+	dev_pm_opp_detach_genpd(data);
+}
+
+/**
+ * devm_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer
+ * @dev: Consumer device for which the genpd is getting attached.
+ * @names: Null terminated array of pointers containing names of genpd to attach.
+ * @virt_devs: Pointer to return the array of virtual devices.
+ *
+ * This is a resource-managed version of dev_pm_opp_attach_genpd().
+ *
+ * Return: pointer to 'struct opp_table' on success and errorno otherwise.
+ */
+struct opp_table *
+devm_pm_opp_attach_genpd(struct device *dev, const char **names,
+			 struct device ***virt_devs)
+{
+	struct opp_table *opp_table;
+	int err;
+
+	opp_table = dev_pm_opp_attach_genpd(dev, names, virt_devs);
+	if (IS_ERR(opp_table))
+		return opp_table;
+
+	err = devm_add_action_or_reset(dev, devm_pm_opp_detach_genpd,
+				       opp_table);
+	if (err)
+		return ERR_PTR(err);
+
+	return opp_table;
+}
+EXPORT_SYMBOL_GPL(devm_pm_opp_attach_genpd);
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 6de5853aaada..eefd0b15890c 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -170,6 +170,7 @@ 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_voltage(struct device *dev, struct dev_pm_opp *opp);
 struct opp_table *devm_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
+struct opp_table *devm_pm_opp_attach_genpd(struct device *dev, const char **names, struct device ***virt_devs);
 #else
 static inline struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
 {
@@ -436,6 +437,13 @@ devm_pm_opp_register_set_opp_helper(struct device *dev,
 	return ERR_PTR(-ENOTSUPP);
 }
 
+static inline struct opp_table *
+devm_pm_opp_attach_genpd(struct device *dev, const char **names,
+			 struct device ***virt_devs)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
 #endif		/* CONFIG_PM_OPP */
 
 #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
-- 
2.29.2