[PATCH v3 7/7] clk: tests: Add Kunit testing for nexus nodes

[Miquel Raynal (Schneider Electric)]

Add a nexus node with a child requesting a mapped clock in the fake DT
overlay to verify that the parsing is also correctly working.

Suggested-by: Stephen Boyd <sboyd@xxxxxxxxxx>
Signed-off-by: Miquel Raynal (Schneider Electric) <miquel.raynal@xxxxxxxxxxx>
---
 drivers/clk/clk_kunit_helpers.c          | 31 +++++++++++++++++++++++++++++++
 drivers/clk/clk_test.c                   | 15 +++++++++++++++
 drivers/clk/kunit_clk_parse_clkspec.dtso | 10 ++++++++++
 include/kunit/clk.h                      |  2 ++
 4 files changed, 58 insertions(+)

diff --git a/drivers/clk/clk_kunit_helpers.c b/drivers/clk/clk_kunit_helpers.c
index 68a28e70bb61..151f62ab57c1 100644
--- a/drivers/clk/clk_kunit_helpers.c
+++ b/drivers/clk/clk_kunit_helpers.c
@@ -233,5 +233,36 @@ int of_clk_add_hw_provider_kunit(struct kunit *test, struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(of_clk_add_hw_provider_kunit);
 
+KUNIT_DEFINE_ACTION_WRAPPER(of_node_put_wrapper, of_node_put, struct device_node *);
+
+/**
+ * of_find_node_by_name_kunit() - Test managed of_find_node_by_name()
+ * @test: The test context
+ * @from: Parent device node to start searching from, or NULL to search from root
+ * @name: The name string to match against
+ *
+ * Just like of_find_node_by_name(), except the device_noded is managed by
+ * the test case and is automatically put after the test case concludes.
+ *
+ * Return: the device_node on success or a negative errno value on failure.
+ */
+struct device_node *of_find_node_by_name_kunit(struct kunit *test, struct device_node *from,
+					       const char *name)
+{
+	struct device_node *np;
+	int ret;
+
+	np = of_find_node_by_name(from, name);
+	if (!np)
+		return NULL;
+
+	ret = kunit_add_action_or_reset(test, of_node_put_wrapper, np);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return np;
+}
+EXPORT_SYMBOL_GPL(of_find_node_by_name_kunit);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("KUnit helpers for clk providers and consumers");
diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c
index 4084559e157d..0c2f1efdaa8e 100644
--- a/drivers/clk/clk_test.c
+++ b/drivers/clk/clk_test.c
@@ -3650,10 +3650,25 @@ static void of_clk_get_parent_name_gets_parent_name(struct kunit *test)
 			   of_clk_get_parent_name(ctx->cons_np, 0));
 }
 
+static void of_clk_get_hw_maps_thru_nexus(struct kunit *test)
+{
+	struct clk_parse_clkspec_ctx *ctx = test->priv;
+	struct clk_hw *expected;
+	struct device_node *np;
+
+	np = of_find_node_by_name_kunit(test, NULL, "kunit-clock-nexus-child");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
+	expected = of_clk_get_hw(ctx->cons_np, 1, NULL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, expected);
+
+	KUNIT_EXPECT_PTR_EQ(test, expected, of_clk_get_hw(np, 0, NULL));
+}
+
 static struct kunit_case clk_parse_clkspec_test_cases[] = {
 	KUNIT_CASE(clk_parse_clkspec_with_correct_index_and_name),
 	KUNIT_CASE(clk_parse_clkspec_with_incorrect_index_and_name),
 	KUNIT_CASE(of_clk_get_parent_name_gets_parent_name),
+	KUNIT_CASE(of_clk_get_hw_maps_thru_nexus),
 	{}
 };
 
diff --git a/drivers/clk/kunit_clk_parse_clkspec.dtso b/drivers/clk/kunit_clk_parse_clkspec.dtso
index c93feb93e101..a4115216d2aa 100644
--- a/drivers/clk/kunit_clk_parse_clkspec.dtso
+++ b/drivers/clk/kunit_clk_parse_clkspec.dtso
@@ -18,4 +18,14 @@ kunit-clock-consumer {
 		clocks = <&kunit_clock_provider1 0>, <&kunit_clock_provider2 0>;
 		clock-names = "first_clock", "second_clock";
 	};
+
+	kunit_clock_nexus: kunit-clock-nexus {
+		clocks = <&kunit_clock_provider2 0>;
+		clock-map = <&kunit_clock_provider2 0>;
+		#clock-cells = <0>;
+
+		kunit-clock-nexus-child {
+			clocks = <&kunit_clock_nexus>;
+		};
+	};
 };
diff --git a/include/kunit/clk.h b/include/kunit/clk.h
index f226044cc78d..ab24f7747516 100644
--- a/include/kunit/clk.h
+++ b/include/kunit/clk.h
@@ -29,5 +29,7 @@ int of_clk_hw_register_kunit(struct kunit *test, struct device_node *node,
 int of_clk_add_hw_provider_kunit(struct kunit *test, struct device_node *np,
 				 struct clk_hw *(*get)(struct of_phandle_args *clkspec, void *data),
 				 void *data);
+struct device_node *of_find_node_by_name_kunit(struct kunit *test, struct device_node *from,
+					       const char *name);
 
 #endif

-- 
2.54.0