Behaves 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 <[email protected]> --- drivers/clk/clk-devres.c | 11 +++++++++++ drivers/clk/clkdev.c | 11 +++++++++++ include/linux/clk.h | 27 +++++++++++++++++++++++++++ 3 files changed, 49 insertions(+) diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c index d854e26..63295d9 100644 --- a/drivers/clk/clk-devres.c +++ b/drivers/clk/clk-devres.c @@ -34,6 +34,17 @@ struct clk *devm_clk_get(struct device *dev, const char *id) } EXPORT_SYMBOL(devm_clk_get); +struct clk *devm_clk_get_optional(struct device *dev, const char *id) +{ + struct clk *c = devm_clk_get(dev, id); + + if (PTR_ERR(c) == -ENOENT) + return NULL; + + return c; +} +EXPORT_SYMBOL(devm_clk_get_optional); + struct clk_bulk_devres { struct clk_bulk_data *clks; int num_clks; diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c index 7513411..7f2cd1e 100644 --- a/drivers/clk/clkdev.c +++ b/drivers/clk/clkdev.c @@ -209,6 +209,17 @@ struct clk *clk_get(struct device *dev, const char *con_id) } EXPORT_SYMBOL(clk_get); +struct clk *clk_get_optional(struct device *dev, const char *id) +{ + struct clk *c = clk_get(dev, id); + + if (PTR_ERR(c) == -ENOENT) + return NULL; + + return c; +} +EXPORT_SYMBOL(clk_get_optional); + void clk_put(struct clk *clk) { __clk_put(clk); diff --git a/include/linux/clk.h b/include/linux/clk.h index 0dbd088..907202b 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -258,6 +258,14 @@ static inline void clk_bulk_unprepare(int num_clks, struct clk_bulk_data *clks) struct clk *clk_get(struct device *dev, const char *id); /** + * clk_get_optional - lookup and obtain a reference to optional clock producer. + * + * Behaves the same as clk_get except where there is no clock producer. In this + * case, instead of returning -ENOENT, the function returns NULL. + */ +struct clk *clk_get_optional(struct device *dev, const char *id); + +/** * clk_bulk_get - lookup and obtain a number of references to clock producer. * @dev: device for clock "consumer" * @num_clks: the number of clk_bulk_data @@ -316,6 +324,14 @@ int __must_check devm_clk_bulk_get(struct device *dev, int num_clks, struct clk *devm_clk_get(struct device *dev, const char *id); /** + * devm_clk_get_optional - lookup and obtain a managed reference to an optional + * clock producer. + * Behaves the same as devm_clk_get except where there is no clock producer. In + * this case, instead of returning -ENOENT, the function returns NULL. + */ +struct clk *devm_clk_get_optional(struct device *dev, const char *id); + +/** * devm_get_clk_from_child - lookup and obtain a managed reference to a * clock producer from child node. * @dev: device for clock "consumer" @@ -603,6 +619,11 @@ static inline struct clk *clk_get(struct device *dev, const char *id) return NULL; } +static inline struct clk *clk_get_optional(struct device *dev, const char *id) +{ + return NULL; +} + static inline int __must_check clk_bulk_get(struct device *dev, int num_clks, struct clk_bulk_data *clks) { @@ -614,6 +635,12 @@ static inline struct clk *devm_clk_get(struct device *dev, const char *id) return NULL; } +static inline struct clk *devm_clk_get_optional(struct device *dev, + const char *id) +{ + return NULL; +} + static inline int __must_check devm_clk_bulk_get(struct device *dev, int num_clks, struct clk_bulk_data *clks) { -- 2.7.4
