[PATCH 1/1] clk: Document of_clk_get_by_name() return values

[Dan Carpenter <error27@gmail.com>]

Callers should test the return from of_clk_get_by_name() with IS_ERR().
The function returns a valid clock on success and an error pointer on
failure; NULL is not a valid return value.

Document this explicitly to prevent callers from treating NULL as a
separate failure case.

Assisted-by: ChatGPT:gpt-5
Signed-off-by: Dan Carpenter <error27@gmail.com>
---
There are a few other functions which look like they return NULL but
never actually do.  This is one which has caused some confusion in
the past.

 drivers/clk/clk.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index f1756fe59372..a71bcf780de4 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -5430,6 +5430,9 @@ EXPORT_SYMBOL(of_clk_get);
  * This function parses the clocks and clock-names properties,
  * and uses them to look up the struct clk from the registered list of clock
  * providers.
+ *
+ * Returns: A clock pointer on success or an error pointer on failure.  This
+ * function never returns NULL.
  */
 struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
 {
-- 
2.53.0