Messages in this thread Patch in this message |  | | From | Viresh Kumar <> | | Subject | [PATCH 01/13] clk: Add non CONFIG_HAVE_CLK routines | | Date | Sat, 21 Apr 2012 17:17:28 +0530 |
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Many drivers are shared between architectures that may or may not have HAVE_CLK selected for them. To remove compilation errors for them we enclose clk_*() calls in these drivers within #ifdef CONFIG_HAVE_CLK, #endif.
This patch removes the need of these CONFIG_HAVE_CLK statements, by introducing dummy routines when HAVE_CLK is not selected by platforms. So, definition of these routines will always be available. These calls will return error for platforms that don't select HAVE_CLK.
Signed-off-by: Viresh Kumar <viresh.kumar@st.com> --- include/linux/clk.h | 160 ++++++++++++++++++++++++++++++++------------------- 1 files changed, 101 insertions(+), 59 deletions(-)
diff --git a/include/linux/clk.h b/include/linux/clk.h index b025272..6e1c63e 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -84,23 +84,6 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb); #endif /* !CONFIG_COMMON_CLK */ /** - * clk_get - lookup and obtain a reference to a clock producer. - * @dev: device for clock "consumer" - * @id: clock comsumer ID - * - * Returns a struct clk corresponding to the clock producer, or - * valid IS_ERR() condition containing errno. The implementation - * uses @dev and @id to determine the clock consumer, and thereby - * the clock producer. (IOW, @id may be identical strings, but - * clk_get may return different clock producers depending on @dev.) - * - * Drivers must assume that the clock source is not enabled. - * - * clk_get should not be called from within interrupt context. - */ -struct clk *clk_get(struct device *dev, const char *id); - -/** * clk_prepare - prepare a clock source * @clk: clock source * @@ -119,6 +102,42 @@ static inline int clk_prepare(struct clk *clk) #endif /** + * clk_unprepare - undo preparation of a clock source + * @clk: clock source + * + * This undoes a previously prepared clock. The caller must balance + * the number of prepare and unprepare calls. + * + * Must not be called from within atomic context. + */ +#ifdef CONFIG_HAVE_CLK_PREPARE +void clk_unprepare(struct clk *clk); +#else +static inline void clk_unprepare(struct clk *clk) +{ + might_sleep(); +} +#endif + +#ifdef CONFIG_HAVE_CLK +/** + * clk_get - lookup and obtain a reference to a clock producer. + * @dev: device for clock "consumer" + * @id: clock comsumer ID + * + * Returns a struct clk corresponding to the clock producer, or + * valid IS_ERR() condition containing errno. The implementation + * uses @dev and @id to determine the clock consumer, and thereby + * the clock producer. (IOW, @id may be identical strings, but + * clk_get may return different clock producers depending on @dev.) + * + * Drivers must assume that the clock source is not enabled. + * + * clk_get should not be called from within interrupt context. + */ +struct clk *clk_get(struct device *dev, const char *id); + +/** * clk_enable - inform the system when the clock source should be running. * @clk: clock source * @@ -146,47 +165,6 @@ int clk_enable(struct clk *clk); */ void clk_disable(struct clk *clk); - -/** - * clk_unprepare - undo preparation of a clock source - * @clk: clock source - * - * This undoes a previously prepared clock. The caller must balance - * the number of prepare and unprepare calls. - * - * Must not be called from within atomic context. - */ -#ifdef CONFIG_HAVE_CLK_PREPARE -void clk_unprepare(struct clk *clk); -#else -static inline void clk_unprepare(struct clk *clk) -{ - might_sleep(); -} -#endif - -/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */ -static inline int clk_prepare_enable(struct clk *clk) -{ - int ret; - - ret = clk_prepare(clk); - if (ret) - return ret; - ret = clk_enable(clk); - if (ret) - clk_unprepare(clk); - - return ret; -} - -/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */ -static inline void clk_disable_unprepare(struct clk *clk) -{ - clk_disable(clk); - clk_unprepare(clk); -} - /** * clk_get_rate - obtain the current clock rate (in Hz) for a clock source. * This is only valid once the clock source has been enabled. @@ -206,7 +184,6 @@ unsigned long clk_get_rate(struct clk *clk); */ void clk_put(struct clk *clk); - /* * The remaining APIs are optional for machine class support. */ @@ -265,6 +242,71 @@ struct clk *clk_get_parent(struct clk *clk); */ struct clk *clk_get_sys(const char *dev_id, const char *con_id); +#else /* !CONFIG_HAVE_CLK */ + +static inline struct clk *clk_get(struct device *dev, const char *id) +{ + return ERR_PTR(-ENODEV); +} + +static inline void clk_put(struct clk *clk) {} + +static inline int clk_enable(struct clk *clk) +{ + return -ENODEV; +} + +static inline void clk_disable(struct clk *clk) {} + +static inline unsigned long clk_get_rate(struct clk *clk) +{ + return -ENODEV; +} + +static inline int clk_set_rate(struct clk *clk, unsigned long rate) +{ + return -ENODEV; +} + +static inline long clk_round_rate(struct clk *clk, unsigned long rate) +{ + return -ENODEV; +} + +static inline int clk_set_parent(struct clk *clk, struct clk *parent) +{ + return -ENODEV; +} + +static inline struct clk *clk_get_parent(struct clk *clk) +{ + return ERR_PTR(-ENODEV); +} + +#endif + +/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */ +static inline int clk_prepare_enable(struct clk *clk) +{ + int ret; + + ret = clk_prepare(clk); + if (ret) + return ret; + ret = clk_enable(clk); + if (ret) + clk_unprepare(clk); + + return ret; +} + +/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */ +static inline void clk_disable_unprepare(struct clk *clk) +{ + clk_disable(clk); + clk_unprepare(clk); +} + /** * clk_add_alias - add a new clock alias * @alias: name for clock alias -- 1.7.9
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