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Date:   Fri,  1 Jan 2021 16:54:37 +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,
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        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,
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        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 01/31] opp: Add devres wrapper for dev_pm_opp_set_clkname and dev_pm_opp_put_clkname

Add devres wrapper for dev_pm_opp_set_clkname() and
dev_pm_opp_put_clkname() to simplify driver code.

Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
---
 drivers/opp/core.c     | 47 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h |  9 ++++++++
 2 files changed, 56 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 4268eb359915..53fdf33732d5 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1948,6 +1948,53 @@ void dev_pm_opp_put_clkname(struct opp_table *opp_table)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname);
 
+static void devm_pm_opp_clkname_release(void *data)
+{
+	dev_pm_opp_put_clkname(data);
+}
+
+/**
+ * devm_pm_opp_set_clkname() - Set clk name for the device
+ * @dev: Device for which clk name is being set.
+ * @name: Clk name.
+ *
+ * In order to support OPP switching, OPP layer needs to get pointer to the
+ * clock for the device. Simple cases work fine without using this routine (i.e.
+ * by passing connection-id as NULL), but for a device with multiple clocks
+ * available, the OPP core needs to know the exact name of the clk to use.
+ *
+ * This must be called before any OPPs are initialized for the device.
+ *
+ * The opp_table structure will be freed after the device is destroyed.
+ */
+struct opp_table *devm_pm_opp_set_clkname(struct device *dev, const char *name)
+{
+	struct opp_table *opp_table;
+	int err;
+
+	opp_table = dev_pm_opp_set_clkname(dev, name);
+	if (IS_ERR(opp_table))
+		return opp_table;
+
+	err = devm_add_action_or_reset(dev, devm_pm_opp_clkname_release, opp_table);
+	if (err)
+		opp_table = ERR_PTR(err);
+
+	return opp_table;
+}
+EXPORT_SYMBOL_GPL(devm_pm_opp_set_clkname);
+
+/**
+ * devm_pm_opp_put_clkname() - Releases resources blocked for clk.
+ * @dev: Device for which we do this operation.
+ * @opp_table: OPP table returned from devm_pm_opp_set_clkname().
+ */
+void devm_pm_opp_put_clkname(struct device *dev, struct opp_table *opp_table)
+{
+	devm_release_action(dev, devm_pm_opp_clkname_release, opp_table);
+}
+EXPORT_SYMBOL_GPL(devm_pm_opp_put_clkname);
+
 /**
  * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper
  * @dev: Device for which the helper is getting registered.
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 1435c054016a..3418a2874f88 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -145,6 +145,8 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * con
 void dev_pm_opp_put_regulators(struct opp_table *opp_table);
 struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char * name);
 void dev_pm_opp_put_clkname(struct opp_table *opp_table);
+struct opp_table *devm_pm_opp_set_clkname(struct device *dev, const char *name);
+void devm_pm_opp_put_clkname(struct device *dev, struct opp_table *opp_table);
 struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
 void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table);
 struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names, struct device ***virt_devs);
@@ -326,6 +328,13 @@ static inline struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const
 
 static inline void dev_pm_opp_put_clkname(struct opp_table *opp_table) {}
 
+static inline struct opp_table *devm_pm_opp_set_clkname(struct device *dev, const char *name)
+{
+	return ERR_PTR(-ENOTSUPP);
+}
+
+static inline void devm_pm_opp_put_clkname(struct device *dev, struct opp_table *opp_table) {}
+
 static inline struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names, struct device ***virt_devs)
 {
 	return ERR_PTR(-ENOTSUPP);
-- 
2.25.1

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