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author | Michael Turquette <mturquette@linaro.org> | 2015-01-24 16:58:40 -0800 |
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committer | Michael Turquette <mturquette@linaro.org> | 2015-01-24 16:58:40 -0800 |
commit | 57386798f7db7f09d69f3b44fc66570e6db91bba (patch) | |
tree | c5e5134535a4019005a3b8d089ea54049f4cdc1d /drivers/clk | |
parent | ec6415dc4160c3b312c0ac6143e5f587837bbd1f (diff) | |
parent | 4e88f3de89fbb7b5a5a0aca20376b276d26732ac (diff) | |
download | op-kernel-dev-57386798f7db7f09d69f3b44fc66570e6db91bba.zip op-kernel-dev-57386798f7db7f09d69f3b44fc66570e6db91bba.tar.gz |
Merge branch 'clk-has-parent' into clk-next
Diffstat (limited to 'drivers/clk')
-rw-r--r-- | drivers/clk/clk.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 7f25aaf..7ba02e5 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1652,6 +1652,36 @@ void __clk_reparent(struct clk *clk, struct clk *new_parent) } /** + * clk_has_parent - check if a clock is a possible parent for another + * @clk: clock source + * @parent: parent clock source + * + * This function can be used in drivers that need to check that a clock can be + * the parent of another without actually changing the parent. + * + * Returns true if @parent is a possible parent for @clk, false otherwise. + */ +bool clk_has_parent(struct clk *clk, struct clk *parent) +{ + unsigned int i; + + /* NULL clocks should be nops, so return success if either is NULL. */ + if (!clk || !parent) + return true; + + /* Optimize for the case where the parent is already the parent. */ + if (clk->parent == parent) + return true; + + for (i = 0; i < clk->num_parents; i++) + if (strcmp(clk->parent_names[i], parent->name) == 0) + return true; + + return false; +} +EXPORT_SYMBOL_GPL(clk_has_parent); + +/** * clk_set_parent - switch the parent of a mux clk * @clk: the mux clk whose input we are switching * @parent: the new input to clk |