linux-kernel - [PATCH 1/3] opp: Add devres wrapper for dev_pm_opp_set_supported

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Date:   Mon, 12 Oct 2020 21:55:15 +0800
From:   Frank Lee <frank@...winnertech.com>
To:     robdclark@...il.com, sean@...rly.run, airlied@...ux.ie,
        daniel@...ll.ch, vireshk@...nel.org, nm@...com, sboyd@...nel.org,
        rjw@...ysocki.net, jcrouse@...eaurora.org, eric@...olt.net,
        tiny.windzz@...il.com, kholk11@...il.com,
        emil.velikov@...labora.com, gustavoars@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Yangtao Li <frank@...winnertech.com>
Subject: [PATCH 1/3] opp: Add devres wrapper for dev_pm_opp_set_supported_hw

From: Yangtao Li <tiny.windzz@...il.com>

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

Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
Signed-off-by: Yangtao Li <frank@...winnertech.com>
---
 drivers/opp/core.c     | 41 +++++++++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h |  8 ++++++++
 2 files changed, 49 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 3ca7543142bf..b38852dde578 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1625,6 +1625,47 @@ void dev_pm_opp_put_supported_hw(struct opp_table *opp_table)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw);
 
+static void devm_pm_opp_put_supported_hw(struct device *dev, void *res)
+{
+	dev_pm_opp_put_supported_hw(*(struct opp_table **)res);
+}
+
+/**
+ * devm_pm_opp_set_supported_hw() - Set supported platforms
+ * @dev: Device for which supported-hw has to be set.
+ * @versions: Array of hierarchy of versions to match.
+ * @count: Number of elements in the array.
+ *
+ * This is required only for the V2 bindings, and it enables a platform to
+ * specify the hierarchy of versions it supports. OPP layer will then enable
+ * OPPs, which are available for those versions, based on its 'opp-supported-hw'
+ * property.
+ *
+ * The opp_table structure will be freed after the device is destroyed.
+ */
+struct opp_table *devm_pm_opp_set_supported_hw(struct device *dev,
+					       const u32 *versions,
+					       unsigned int count)
+{
+	struct opp_table **ptr, *opp_table;
+
+	ptr = devres_alloc(devm_pm_opp_put_supported_hw,
+			   sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	opp_table = dev_pm_opp_set_supported_hw(dev, versions, count);
+	if (!IS_ERR(opp_table)) {
+		*ptr = opp_table;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return opp_table;
+}
+EXPORT_SYMBOL(devm_pm_opp_set_supported_hw);
+
 /**
  * dev_pm_opp_set_prop_name() - Set prop-extn name
  * @dev: Device for which the prop-name has to be set.
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index dbb484524f82..901920e29c54 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -140,6 +140,7 @@ int dev_pm_opp_unregister_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);
+struct opp_table *devm_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, unsigned int count);
 struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name);
 void dev_pm_opp_put_prop_name(struct opp_table *opp_table);
 struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count);
@@ -298,6 +299,13 @@ static inline struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev,
 
 static inline void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) {}
 
+static inline struct opp_table *devm_pm_opp_set_supported_hw(struct device *dev,
+							     const u32 *versions,
+							     unsigned int count)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
 static inline struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev,
 			int (*set_opp)(struct dev_pm_set_opp_data *data))
 {
-- 
2.28.0