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Date:   Fri,  1 Jan 2021 16:54:41 +0000
From:   Yangtao Li <tiny.windzz@...il.com>
To:     myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        cw00.choi@...sung.com, krzk@...nel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, digetx@...il.com, thierry.reding@...il.com,
        jonathanh@...dia.com, yuq825@...il.com, airlied@...ux.ie,
        daniel@...ll.ch, robdclark@...il.com, sean@...rly.run,
        robh@...nel.org, tomeu.vizoso@...labora.com, steven.price@....com,
        alyssa.rosenzweig@...labora.com, stanimir.varbanov@...aro.org,
        agross@...nel.org, bjorn.andersson@...aro.org, mchehab@...nel.org,
        lukasz.luba@....com, adrian.hunter@...el.com,
        ulf.hansson@...aro.org, vireshk@...nel.org, nm@...com,
        sboyd@...nel.org, broonie@...nel.org, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, rjw@...ysocki.net, jcrouse@...eaurora.org,
        hoegsberg@...gle.com, eric@...olt.net, tzimmermann@...e.de,
        marijn.suijten@...ainline.org, gustavoars@...nel.org,
        emil.velikov@...labora.com, jonathan@...ek.ca,
        akhilpo@...eaurora.org, smasetty@...eaurora.org,
        airlied@...hat.com, masneyb@...tation.org, kalyan_t@...eaurora.org,
        tanmay@...eaurora.org, tiny.windzz@...il.com,
        ddavenport@...omium.org, jsanka@...eaurora.org,
        rnayak@...eaurora.org, tongtiangen@...wei.com,
        miaoqinglang@...wei.com, khsieh@...eaurora.org,
        abhinavk@...eaurora.org, chandanu@...eaurora.org,
        groeck@...omium.org, varar@...eaurora.org, mka@...omium.org,
        harigovi@...eaurora.org, rikard.falkeborn@...il.com,
        natechancellor@...il.com, georgi.djakov@...aro.org,
        akashast@...eaurora.org, parashar@...eaurora.org,
        dianders@...omium.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, lima@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        linux-media@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-serial@...r.kernel.org
Subject: [PATCH 05/31] opp: Add devres wrapper for dev_pm_opp_register_notifier

Add devres wrapper for dev_pm_opp_register_notifier() to simplify driver
code.

Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
---
 drivers/opp/core.c     | 38 ++++++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h |  6 ++++++
 2 files changed, 44 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 6b83e373f0d8..ef3544f8cecd 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2599,6 +2599,44 @@ int dev_pm_opp_unregister_notifier(struct device *dev,
 }
 EXPORT_SYMBOL(dev_pm_opp_unregister_notifier);
 
+static void devm_pm_opp_notifier_release(struct device *dev, void *res)
+{
+	struct notifier_block *nb = *(struct notifier_block **)res;
+
+	WARN_ON(dev_pm_opp_unregister_notifier(dev, nb));
+}
+
+/**
+ * devm_pm_opp_register_notifier() - Register OPP notifier for the device
+ * @dev:	Device for which notifier needs to be registered
+ * @nb:		Notifier block to be registered
+ *
+ * Return: 0 on success or a negative error value.
+ *
+ * The notifier will be unregistered after the device is destroyed.
+ */
+int devm_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
+{
+	struct notifier_block **ptr;
+	int ret;
+
+	ptr = devres_alloc(devm_pm_opp_notifier_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+
+	ret = dev_pm_opp_register_notifier(dev, nb);
+	if (ret) {
+		devres_free(ptr);
+		return ret;
+	}
+
+	*ptr = nb;
+	devres_add(dev, ptr);
+
+	return 0;
+}
+EXPORT_SYMBOL(devm_pm_opp_register_notifier);
+
 /**
  * dev_pm_opp_remove_table() - Free all OPPs associated with the device
  * @dev:	device pointer used to lookup OPP table.
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index e8bdac5f9555..c24bd34339d7 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -136,6 +136,7 @@ int dev_pm_opp_disable(struct device *dev, unsigned long freq);
 
 int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);
 int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb);
+int devm_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb);
 
 struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, unsigned int count);
 void dev_pm_opp_put_supported_hw(struct opp_table *opp_table);
@@ -288,6 +289,11 @@ static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifi
 	return -ENOTSUPP;
 }
 
+static inline int devm_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb)
+{
+	return -ENOTSUPP;
+}
+
 static inline int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb)
 {
 	return -ENOTSUPP;
-- 
2.25.1

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