If unsure, say N here. This option is not safe to enable.
+config OF_KUNIT_TEST
+ tristate "Devicetree KUnit Test" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ This option builds KUnit unit tests for device tree infrastructure.
+
+ If unsure, say N here, but this option is safe to enable.
+
config OF_ALL_DTBS
bool "Build all Device Tree Blobs"
depends on COMPILE_TEST
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit tests for OF APIs
+ */
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include <kunit/test.h>
+
+/*
+ * Test that the root node "/" can be found by path.
+ */
+static void of_dtb_root_node_found_by_path(struct kunit *test)
+{
+ struct device_node *np;
+
+ np = of_find_node_by_path("/");
+ KUNIT_EXPECT_NOT_ERR_OR_NULL(test, np);
+ of_node_put(np);
+}
+
+/*
+ * Test that the 'of_root' global variable is always populated when DT code is
+ * enabled. Remove this test once of_root is removed from global access.
+ */
+static void of_dtb_root_node_populates_of_root(struct kunit *test)
+{
+ KUNIT_EXPECT_NOT_ERR_OR_NULL(test, of_root);
+}
+
+static struct kunit_case of_dtb_test_cases[] = {
+ KUNIT_CASE(of_dtb_root_node_found_by_path),
+ KUNIT_CASE(of_dtb_root_node_populates_of_root),
+ {}
+};
+
+static int of_dtb_test_init(struct kunit *test)
+{
+ if (!IS_ENABLED(CONFIG_OF_EARLY_FLATTREE))
+ kunit_skip(test, "requires CONFIG_OF_EARLY_FLATTREE");
+
+ return 0;
+}
+
+/*
+ * Test suite to confirm a DTB is loaded.
+ */
+static struct kunit_suite of_dtb_suite = {
+ .name = "of_dtb",
+ .test_cases = of_dtb_test_cases,
+ .init = of_dtb_test_init,
+};
+
+kunit_test_suites(
+ &of_dtb_suite,
+);
+MODULE_LICENSE("GPL");