From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Scott Wood To: Russell King , Michael Turquette , Stephen Boyd , Viresh Kumar , "Rafael J. Wysocki" Cc: linux-clk@vger.kernel.org, linux-pm@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, yuantian.tang@nxp.com, leoyang.li@nxp.com, xiaofeng.ren@nxp.com, Scott Wood Date: Thu, 16 Jun 2016 01:21:24 -0500 Message-Id: <1466058085-19353-1-git-send-email-oss@buserror.net> Subject: [PATCH v3 1/2] clk: Add consumer APIs for discovering possible parent clocks List-ID: From: Scott Wood Commit fc4a05d4b0eb ("clk: Remove unused provider APIs") removed __clk_get_num_parents() and clk_hw_get_parent_by_index(), leaving only true provider API versions that operate on struct clk_hw. qoriq-cpufreq needs these functions in order to determine the options it has for calling clk_set_parent() and thus populate the cpufreq table, so revive them as legitimate consumer APIs. Signed-off-by: Scott Wood --- v2: Add missing 'static inline' to stub functions. v3: no changes drivers/clk/clk.c | 19 +++++++++++++++++++ include/linux/clk.h | 31 +++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index d584004..d61a3fe 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -290,6 +290,12 @@ struct clk_hw *__clk_get_hw(struct clk *clk) } EXPORT_SYMBOL_GPL(__clk_get_hw); +unsigned int clk_get_num_parents(struct clk *clk) +{ + return !clk ? 0 : clk->core->num_parents; +} +EXPORT_SYMBOL_GPL(clk_get_num_parents); + unsigned int clk_hw_get_num_parents(const struct clk_hw *hw) { return hw->core->num_parents; @@ -358,6 +364,19 @@ static struct clk_core *clk_core_get_parent_by_index(struct clk_core *core, return core->parents[index]; } +struct clk *clk_get_parent_by_index(struct clk *clk, unsigned int index) +{ + struct clk_core *parent; + + if (!clk) + return NULL; + + parent = clk_core_get_parent_by_index(clk->core, index); + + return !parent ? NULL : parent->hw->clk; +} +EXPORT_SYMBOL_GPL(clk_get_parent_by_index); + struct clk_hw * clk_hw_get_parent_by_index(const struct clk_hw *hw, unsigned int index) { diff --git a/include/linux/clk.h b/include/linux/clk.h index 0df4a51..acd115f 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -392,6 +392,26 @@ int clk_set_parent(struct clk *clk, struct clk *parent); struct clk *clk_get_parent(struct clk *clk); /** + * clk_get_parent_by_index - get a possible parent clock by index + * @clk: clock source + * @index: index into the array of possible parents of this clock + * + * Returns struct clk corresponding to the requested possible + * parent clock source, or NULL. + */ +struct clk *clk_get_parent_by_index(struct clk *clk, + unsigned int index); + +/** + * clk_get_num_parents - get number of possible parents + * @clk: clock source + * + * Returns the number of possible parents of this clock, + * which can then be enumerated using clk_get_parent_by_index(). + */ +unsigned int clk_get_num_parents(struct clk *clk); + +/** * clk_get_sys - get a clock based upon the device name * @dev_id: device name * @con_id: connection ID @@ -461,6 +481,17 @@ static inline struct clk *clk_get_parent(struct clk *clk) return NULL; } +static inline struct clk *clk_get_parent_by_index(struct clk *clk, + unsigned int index) +{ + return NULL; +} + +static inline unsigned int clk_get_num_parents(struct clk *clk) +{ + return 0; +} + #endif /* clk_prepare_enable helps cases using clk_enable in non-atomic context. */ -- 2.5.0