clk: Dont return error when assigned-clocks is empty or missing

There is a chance that assigned-clock-rates is given and assigned-clocks
could be empty. Dont return error in that case, because the probe of the
corresponding driver will not be called at all if this fails.
Better to continue to look for it and return 0.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/a9a9d853e0ac396cd9b3577cce26279a75765711.1693384296.git.michal.simek@amd.com

3 files changed, 32 insertions, 1 deletions

diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index d4693e3c7a9..e6a471e40d9 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -614,6 +614,22 @@
 		clock-names = "fixed", "i2c", "spi", "uart2", "uart1";
 	};
 
+	clk-test2 {
+		compatible = "sandbox,clk-test";
+		assigned-clock-rates = <321>;
+	};
+
+	clk-test3 {
+		compatible = "sandbox,clk-test";
+		assigned-clocks = <&clk_sandbox 1>;
+	};
+
+	clk-test4 {
+		compatible = "sandbox,clk-test";
+		assigned-clock-rates = <654>, <321>;
+		assigned-clocks = <&clk_sandbox 1>;
+	};
+
 	ccf: clk-ccf {
 		compatible = "sandbox,clk-ccf";
 	};
diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
index dc3e9d6a261..f186fcbcdb8 100644
--- a/drivers/clk/clk-uclass.c
+++ b/drivers/clk/clk-uclass.c
@@ -329,7 +329,13 @@ static int clk_set_default_rates(struct udevice *dev,
 			dev_dbg(dev,
 				"could not get assigned clock %d (err = %d)\n",
 				index, ret);
-			continue;
+			/* Skip if it is empty */
+			if (ret == -ENOENT) {
+				ret = 0;
+				continue;
+			}
+
+			return ret;
 		}
 
 		/* This is clk provider device trying to program itself
diff --git a/test/dm/clk.c b/test/dm/clk.c
index f48de05436b..01417fbd825 100644
--- a/test/dm/clk.c
+++ b/test/dm/clk.c
@@ -36,6 +36,15 @@ static int dm_test_clk_base(struct unit_test_state *uts)
 	ut_asserteq(clk_is_match(&clk_method1, &clk_method2), true);
 	ut_asserteq(clk_method1.id, clk_method2.id);
 
+	ut_assertok(uclass_get_device_by_name(UCLASS_MISC, "clk-test2", &dev));
+	ut_assertok(clk_set_defaults(dev, CLK_DEFAULTS_PRE));
+
+	ut_assertok(uclass_get_device_by_name(UCLASS_MISC, "clk-test3", &dev));
+	ut_assertok(clk_set_defaults(dev, CLK_DEFAULTS_PRE));
+
+	ut_assertok(uclass_get_device_by_name(UCLASS_MISC, "clk-test4", &dev));
+	ut_assertok(clk_set_defaults(dev, CLK_DEFAULTS_PRE));
+
 	return 0;
 }