PM / OPP: Add dev_pm_opp_{set|put}_clkname() (829a4e8c) · Commits · 戴 / test

drivers/base/power/opp/core.c

+67 −0

Original line number	Diff line number	Diff line
		@@ -1362,6 +1362,73 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table)
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);

		/**
		* dev_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.
		*/
		struct opp_table dev_pm_opp_set_clkname(struct device dev, const char *name)
		{
		struct opp_table *opp_table;
		int ret;

		opp_table = dev_pm_opp_get_opp_table(dev);
		if (!opp_table)
		return ERR_PTR(-ENOMEM);

		/* This should be called before OPPs are initialized */
		if (WARN_ON(!list_empty(&opp_table->opp_list))) {
		ret = -EBUSY;
		goto err;
		}

		/* Already have default clk set, free it */
		if (!IS_ERR(opp_table->clk))
		clk_put(opp_table->clk);

		/* Find clk for the device */
		opp_table->clk = clk_get(dev, name);
		if (IS_ERR(opp_table->clk)) {
		ret = PTR_ERR(opp_table->clk);
		if (ret != -EPROBE_DEFER) {
		dev_err(dev, "%s: Couldn't find clock: %d\n", __func__,
		ret);
		}
		goto err;
		}

		return opp_table;

		err:
		dev_pm_opp_put_opp_table(opp_table);

		return ERR_PTR(ret);
		}
		EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname);

		/**
		* dev_pm_opp_put_clkname() - Releases resources blocked for clk.
		* @opp_table: OPP table returned from dev_pm_opp_set_clkname().
		*/
		void dev_pm_opp_put_clkname(struct opp_table *opp_table)
		{
		/* Make sure there are no concurrent readers while updating opp_table */
		WARN_ON(!list_empty(&opp_table->opp_list));

		clk_put(opp_table->clk);
		opp_table->clk = ERR_PTR(-EINVAL);

		dev_pm_opp_put_opp_table(opp_table);
		}
		EXPORT_SYMBOL_GPL(dev_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.

include/linux/pm_opp.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -121,6 +121,8 @@ 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);
		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 dev_pm_opp_register_set_opp_helper(struct device dev, int (set_opp)(struct dev_pm_set_opp_data data));
		void dev_pm_opp_register_put_opp_helper(struct opp_table *opp_table);
		int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq);
		@@ -257,6 +259,13 @@ static inline struct opp_table dev_pm_opp_set_regulators(struct device dev, co

		static inline void dev_pm_opp_put_regulators(struct opp_table *opp_table) {}

		static inline struct opp_table dev_pm_opp_set_clkname(struct device dev, const char * name)
		{
		return ERR_PTR(-ENOTSUPP);
		}

		static inline void dev_pm_opp_put_clkname(struct opp_table *opp_table) {}

		static inline int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
		{
		return -ENOTSUPP;

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