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author | Sylwester Nawrocki <s.nawrocki@samsung.com> | 2014-05-19 19:22:50 +0200 |
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committer | Mike Turquette <mturquette@linaro.org> | 2014-05-22 15:54:59 -0700 |
commit | 7f05e28f9dd3eb7a3f27c6f50b715995dc7a88c5 (patch) | |
tree | ffde9347941f4ee8cfa9112e15bb9a8138bc3be8 /drivers | |
parent | 222cb1bf180e413e1816aaf4166e4f56e72201d8 (diff) | |
download | linux-stable-7f05e28f9dd3eb7a3f27c6f50b715995dc7a88c5.tar.gz linux-stable-7f05e28f9dd3eb7a3f27c6f50b715995dc7a88c5.tar.bz2 linux-stable-7f05e28f9dd3eb7a3f27c6f50b715995dc7a88c5.zip |
clk: Add of_clk_get_by_clkspec() helper
This patch adds of_clk_get_by_clkspec() helper function, which does only
a struct clk lookup from the clock providers. It is used in the subsequent
patch where parsing of a clock from device tree and the lookup from
providers needed to be split.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/clk/clk.h | 1 | ||||
-rw-r--r-- | drivers/clk/clkdev.c | 34 |
2 files changed, 28 insertions, 7 deletions
diff --git a/drivers/clk/clk.h b/drivers/clk/clk.h index 795cc9f0dac0..c798138f023f 100644 --- a/drivers/clk/clk.h +++ b/drivers/clk/clk.h @@ -10,6 +10,7 @@ */ #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) +struct clk *of_clk_get_by_clkspec(struct of_phandle_args *clkspec); struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec); void of_clk_lock(void); void of_clk_unlock(void); diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c index a360b2eca5cb..f890b901c6bc 100644 --- a/drivers/clk/clkdev.c +++ b/drivers/clk/clkdev.c @@ -27,6 +27,32 @@ static LIST_HEAD(clocks); static DEFINE_MUTEX(clocks_mutex); #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) + +/** + * of_clk_get_by_clkspec() - Lookup a clock form a clock provider + * @clkspec: pointer to a clock specifier data structure + * + * This function looks up a struct clk from the registered list of clock + * providers, an input is a clock specifier data structure as returned + * from the of_parse_phandle_with_args() function call. + */ +struct clk *of_clk_get_by_clkspec(struct of_phandle_args *clkspec) +{ + struct clk *clk; + + if (!clkspec) + return ERR_PTR(-EINVAL); + + of_clk_lock(); + clk = __of_clk_get_from_provider(clkspec); + + if (!IS_ERR(clk) && !__clk_get(clk)) + clk = ERR_PTR(-ENOENT); + + of_clk_unlock(); + return clk; +} + struct clk *of_clk_get(struct device_node *np, int index) { struct of_phandle_args clkspec; @@ -41,13 +67,7 @@ struct clk *of_clk_get(struct device_node *np, int index) if (rc) return ERR_PTR(rc); - of_clk_lock(); - clk = __of_clk_get_from_provider(&clkspec); - - if (!IS_ERR(clk) && !__clk_get(clk)) - clk = ERR_PTR(-ENOENT); - - of_clk_unlock(); + clk = of_clk_get_by_clkspec(&clkspec); of_node_put(clkspec.np); return clk; } |