[PATCH v2 01/14] opp: Add devres wrapper for dev_pm_opp_set_clkname

From: Dmitry Osipenko <digetx@gmail.com>
To: Qiang Yu <yuq825@gmail.com>, Rob Clark <robdclark@gmail.com>,
	Sean Paul <sean@poorly.run>, Rob Herring <robh@kernel.org>,
	Tomeu Vizoso <tomeu.vizoso@collabora.com>,
	Steven Price <steven.price@arm.com>,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
	Stanimir Varbanov <stanimir.varbanov@linaro.org>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Lukasz Luba <lukasz.luba@arm.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
	Stephen Boyd <sboyd@kernel.org>, Mark Brown <broonie@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jirislaby@kernel.org>,
	Yangtao Li <tiny.windzz@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>,
	dri-devel@lists.freedesktop.org, lima@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	freedreno@lists.freedesktop.org, linux-media@vger.kernel.org,
	linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
	linux-mmc@vger.kernel.org, linux-spi@vger.kernel.org,
	linux-serial@vger.kernel.org, linux-tegra@vger.kernel.org
Subject: [PATCH v2 01/14] opp: Add devres wrapper for dev_pm_opp_set_clkname
Date: Thu, 11 Mar 2021 22:20:52 +0300	[thread overview]
Message-ID: <20210311192105.14998-2-digetx@gmail.com> (raw)
In-Reply-To: <20210311192105.14998-1-digetx@gmail.com>

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

Add devres wrapper for dev_pm_opp_set_clkname() to simplify drivers code.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/opp/core.c     | 36 ++++++++++++++++++++++++++++++++++++
 include/linux/pm_opp.h |  6 ++++++
 2 files changed, 42 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 150be4c28c99..3345ab8da6b2 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2119,6 +2119,42 @@ 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);
+
 /**
  * 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 c0371efa4a0f..6fb992168f1e 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -150,6 +150,7 @@ 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);
 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 *devm_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data));
@@ -355,6 +356,11 @@ 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(-EOPNOTSUPP);
+}
+
 static inline struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names, struct device ***virt_devs)
 {
 	return ERR_PTR(-EOPNOTSUPP);
-- 
2.29.2

