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clk: Add (devm_)clk_get_optional() functions
This adds clk_get_optional() and devm_clk_get_optional() functions to get optional clocks. They behave the same as (devm_)clk_get() except where there is no clock producer. In this case, instead of returning -ENOENT, the function returns NULL. This makes error checking simpler and allows clk_prepare_enable, etc to be called on the returned reference without additional checks. Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Russell King <linux@armlinux.org.uk> [sboyd@kernel.org: Document in devres.txt] Signed-off-by: Stephen Boyd <sboyd@kernel.org>
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3 changed files with 48 additions and 0 deletions
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@ -242,6 +242,7 @@ certainly invest a bit more effort into libata core layer).
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CLOCK
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devm_clk_get()
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devm_clk_get_optional()
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devm_clk_put()
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devm_clk_hw_register()
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devm_of_clk_add_hw_provider()
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@ -29,6 +29,17 @@ struct clk *devm_clk_get(struct device *dev, const char *id)
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}
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EXPORT_SYMBOL(devm_clk_get);
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struct clk *devm_clk_get_optional(struct device *dev, const char *id)
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{
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struct clk *clk = devm_clk_get(dev, id);
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if (clk == ERR_PTR(-ENOENT))
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return NULL;
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return clk;
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}
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EXPORT_SYMBOL(devm_clk_get_optional);
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struct clk_bulk_devres {
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struct clk_bulk_data *clks;
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int num_clks;
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@ -383,6 +383,17 @@ int __must_check devm_clk_bulk_get_all(struct device *dev,
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*/
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struct clk *devm_clk_get(struct device *dev, const char *id);
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/**
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* devm_clk_get_optional - lookup and obtain a managed reference to an optional
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* clock producer.
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* @dev: device for clock "consumer"
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* @id: clock consumer ID
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*
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* Behaves the same as devm_clk_get() except where there is no clock producer.
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* In this case, instead of returning -ENOENT, the function returns NULL.
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*/
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struct clk *devm_clk_get_optional(struct device *dev, const char *id);
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/**
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* devm_get_clk_from_child - lookup and obtain a managed reference to a
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* clock producer from child node.
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@ -718,6 +729,12 @@ static inline struct clk *devm_clk_get(struct device *dev, const char *id)
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return NULL;
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}
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static inline struct clk *devm_clk_get_optional(struct device *dev,
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const char *id)
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{
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return NULL;
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}
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static inline int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
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struct clk_bulk_data *clks)
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{
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@ -862,6 +879,25 @@ static inline void clk_bulk_disable_unprepare(int num_clks,
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clk_bulk_unprepare(num_clks, clks);
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}
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/**
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* clk_get_optional - lookup and obtain a reference to an optional clock
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* producer.
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* @dev: device for clock "consumer"
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* @id: clock consumer ID
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*
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* Behaves the same as clk_get() except where there is no clock producer. In
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* this case, instead of returning -ENOENT, the function returns NULL.
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*/
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static inline struct clk *clk_get_optional(struct device *dev, const char *id)
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{
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struct clk *clk = clk_get(dev, id);
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if (clk == ERR_PTR(-ENOENT))
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return NULL;
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return clk;
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}
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#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
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struct clk *of_clk_get(struct device_node *np, int index);
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struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
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