summaryrefslogtreecommitdiffstats
path: root/drivers/clk
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk')
-rw-r--r--drivers/clk/clk.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index b9f85fc2ce3f..237f23f68bfc 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2170,6 +2170,32 @@ int clk_get_phase(struct clk *clk)
}
/**
+ * clk_is_match - check if two clk's point to the same hardware clock
+ * @p: clk compared against q
+ * @q: clk compared against p
+ *
+ * Returns true if the two struct clk pointers both point to the same hardware
+ * clock node. Put differently, returns true if struct clk *p and struct clk *q
+ * share the same struct clk_core object.
+ *
+ * Returns false otherwise. Note that two NULL clks are treated as matching.
+ */
+bool clk_is_match(const struct clk *p, const struct clk *q)
+{
+ /* trivial case: identical struct clk's or both NULL */
+ if (p == q)
+ return true;
+
+ /* true if clk->core pointers match. Avoid derefing garbage */
+ if (!IS_ERR_OR_NULL(p) && !IS_ERR_OR_NULL(q))
+ if (p->core == q->core)
+ return true;
+
+ return false;
+}
+EXPORT_SYMBOL_GPL(clk_is_match);
+
+/**
* __clk_init - initialize the data structures in a struct clk
* @dev: device initializing this clk, placeholder for now
* @clk: clk being initialized
OpenPOWER on IntegriCloud