[PATCH] clkdev: Improve clock discovery with clk_find()

[Paul Cercueil]

With a setup where a clock provider registers a clock with a device name
"mydev" and a clock name "myclk", calling clk_find("mydev", NULL) would
not actually return any match.

Update the code so that we can support this while maintaining the
existing behaviour:

- clk_find("dev", "con") matches in order of priority ("dev", "con"),
  ("dev", *) and (*, "con");
- clk_find(NULL, "con") matches (*, "con");
- clk_find("dev", NULL) matches the first case of ("dev", *).
  Note that in that case we don't handle wildcards for the device name
  or it would end up matching everything.

Signed-off-by: Paul Cercueil <paul.cercueil at bootlin.com>
---
 drivers/clk/clkdev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 919fc680ae4d..ee6c0afd6ec0 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -53,7 +53,9 @@ static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
 			match += 2;
 		}
 		if (p->con_id) {
-			if (!con_id || strcmp(p->con_id, con_id))
+			if (!con_id && !p->dev_id)
+				continue;
+			if (con_id && strcmp(p->con_id, con_id))
 				continue;
 			match += 1;
 		}
-- 
2.47.3