Lack of clock can be ok at times and thus the clk API accepts NULL
arguments and treats them as no-op.
Linux provides a clk_get_optional function to simplify code with such
optional code, so let's provide an equivalent for barebox.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
include/linux/clk.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 8509d5ece9d5..82022e78e39d 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -932,4 +932,23 @@ static inline void clk_bulk_disable(int num_clks,
#endif
+/**
+ * clk_get_optional - lookup and obtain a reference to an optional clock
+ * producer.
+ * @dev: device for clock "consumer"
+ * @id: clock consumer ID
+ *
+ * Behaves the same as clk_get() except where there is no clock producer. In
+ * this case, instead of returning -ENOENT, the function returns NULL.
+ */
+static inline struct clk *clk_get_optional(struct device *dev, const char *id)
+{
+ struct clk *clk = clk_get(dev, id);
+
+ if (clk == ERR_PTR(-ENOENT))
+ return NULL;
+
+ return clk;
+}
+
#endif
--
2.39.2
