[RFC v4 15/17] of: unittest: migrate tests to run on KUnit

[Brendan Higgins]

Migrate tests without any cleanup, or modifying test logic in anyway to
run under KUnit using the KUnit expectation and assertion API.

Signed-off-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
---
 drivers/of/Kconfig    |    1 +
 drivers/of/unittest.c | 1310 +++++++++++++++++++++--------------------
 2 files changed, 671 insertions(+), 640 deletions(-)

diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index ad3fcad4d75b8..f309399deac20 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -15,6 +15,7 @@ if OF
 config OF_UNITTEST
 	bool "Device Tree runtime unit tests"
 	depends on !SPARC
+	depends on KUNIT
 	select IRQ_DOMAIN
 	select OF_EARLY_FLATTREE
 	select OF_RESOLVE
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index effa4e2b9d992..96de69ccb3e63 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -26,186 +26,189 @@
 
 #include <linux/bitops.h>
 
+#include <kunit/test.h>
+
 #include "of_private.h"
 
-static struct unittest_results {
-	int passed;
-	int failed;
-} unittest_results;
-
-#define unittest(result, fmt, ...) ({ \
-	bool failed = !(result); \
-	if (failed) { \
-		unittest_results.failed++; \
-		pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
-	} else { \
-		unittest_results.passed++; \
-		pr_debug("pass %s():%i\n", __func__, __LINE__); \
-	} \
-	failed; \
-})
-
-static void __init of_unittest_find_node_by_name(void)
+static void of_unittest_find_node_by_name(struct kunit *test)
 {
 	struct device_node *np;
 	const char *options, *name;
 
 	np = of_find_node_by_path("/testcase-data");
 	name = kasprintf(GFP_KERNEL, "%pOF", np);
-	unittest(np && !strcmp("/testcase-data", name),
-		"find /testcase-data failed\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
+	KUNIT_EXPECT_STREQ_MSG(test, "/testcase-data", name,
+			       "find /testcase-data failed\n");
 	of_node_put(np);
 	kfree(name);
 
 	/* Test if trailing '/' works */
-	np = of_find_node_by_path("/testcase-data/");
-	unittest(!np, "trailing '/' on /testcase-data/ should fail\n");
+	KUNIT_EXPECT_EQ_MSG(test, of_find_node_by_path("/testcase-data/"), NULL,
+			    "trailing '/' on /testcase-data/ should fail\n");
 
 	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 	name = kasprintf(GFP_KERNEL, "%pOF", np);
-	unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", name),
+	KUNIT_EXPECT_STREQ_MSG(
+		test, "/testcase-data/phandle-tests/consumer-a", name,
 		"find /testcase-data/phandle-tests/consumer-a failed\n");
 	of_node_put(np);
 	kfree(name);
 
 	np = of_find_node_by_path("testcase-alias");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 	name = kasprintf(GFP_KERNEL, "%pOF", np);
-	unittest(np && !strcmp("/testcase-data", name),
-		"find testcase-alias failed\n");
+	KUNIT_EXPECT_STREQ_MSG(test, "/testcase-data", name,
+			       "find testcase-alias failed\n");
 	of_node_put(np);
 	kfree(name);
 
 	/* Test if trailing '/' works on aliases */
-	np = of_find_node_by_path("testcase-alias/");
-	unittest(!np, "trailing '/' on testcase-alias/ should fail\n");
+	KUNIT_EXPECT_EQ_MSG(test, of_find_node_by_path("testcase-alias/"), NULL,
+			    "trailing '/' on testcase-alias/ should fail\n");
 
 	np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 	name = kasprintf(GFP_KERNEL, "%pOF", np);
-	unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", name),
+	KUNIT_EXPECT_STREQ_MSG(
+		test, "/testcase-data/phandle-tests/consumer-a", name,
 		"find testcase-alias/phandle-tests/consumer-a failed\n");
 	of_node_put(np);
 	kfree(name);
 
-	np = of_find_node_by_path("/testcase-data/missing-path");
-	unittest(!np, "non-existent path returned node %pOF\n", np);
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		np = of_find_node_by_path("/testcase-data/missing-path"), NULL,
+		"non-existent path returned node %pOF\n", np);
 	of_node_put(np);
 
-	np = of_find_node_by_path("missing-alias");
-	unittest(!np, "non-existent alias returned node %pOF\n", np);
+	KUNIT_EXPECT_EQ_MSG(
+		test, np = of_find_node_by_path("missing-alias"), NULL,
+		"non-existent alias returned node %pOF\n", np);
 	of_node_put(np);
 
-	np = of_find_node_by_path("testcase-alias/missing-path");
-	unittest(!np, "non-existent alias with relative path returned node %pOF\n", np);
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		np = of_find_node_by_path("testcase-alias/missing-path"), NULL,
+		"non-existent alias with relative path returned node %pOF\n",
+		np);
 	of_node_put(np);
 
 	np = of_find_node_opts_by_path("/testcase-data:testoption", &options);
-	unittest(np && !strcmp("testoption", options),
-		 "option path test failed\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
+	KUNIT_EXPECT_STREQ_MSG(test, "testoption", options,
+			       "option path test failed\n");
 	of_node_put(np);
 
 	np = of_find_node_opts_by_path("/testcase-data:test/option", &options);
-	unittest(np && !strcmp("test/option", options),
-		 "option path test, subcase #1 failed\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
+	KUNIT_EXPECT_STREQ_MSG(test, "test/option", options,
+			       "option path test, subcase #1 failed\n");
 	of_node_put(np);
 
 	np = of_find_node_opts_by_path("/testcase-data/testcase-device1:test/option", &options);
-	unittest(np && !strcmp("test/option", options),
-		 "option path test, subcase #2 failed\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
+	KUNIT_EXPECT_STREQ_MSG(test, "test/option", options,
+			       "option path test, subcase #2 failed\n");
 	of_node_put(np);
 
 	np = of_find_node_opts_by_path("/testcase-data:testoption", NULL);
-	unittest(np, "NULL option path test failed\n");
+	KUNIT_EXPECT_NOT_ERR_OR_NULL_MSG(test, np,
+					 "NULL option path test failed\n");
 	of_node_put(np);
 
 	np = of_find_node_opts_by_path("testcase-alias:testaliasoption",
 				       &options);
-	unittest(np && !strcmp("testaliasoption", options),
-		 "option alias path test failed\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
+	KUNIT_EXPECT_STREQ_MSG(test, "testaliasoption", options,
+			       "option alias path test failed\n");
 	of_node_put(np);
 
 	np = of_find_node_opts_by_path("testcase-alias:test/alias/option",
 				       &options);
-	unittest(np && !strcmp("test/alias/option", options),
-		 "option alias path test, subcase #1 failed\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
+	KUNIT_EXPECT_STREQ_MSG(test, "test/alias/option", options,
+			       "option alias path test, subcase #1 failed\n");
 	of_node_put(np);
 
 	np = of_find_node_opts_by_path("testcase-alias:testaliasoption", NULL);
-	unittest(np, "NULL option alias path test failed\n");
+	KUNIT_EXPECT_NOT_ERR_OR_NULL_MSG(
+			test, np, "NULL option alias path test failed\n");
 	of_node_put(np);
 
 	options = "testoption";
 	np = of_find_node_opts_by_path("testcase-alias", &options);
-	unittest(np && !options, "option clearing test failed\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
+	KUNIT_EXPECT_EQ_MSG(test, options, NULL,
+			    "option clearing test failed\n");
 	of_node_put(np);
 
 	options = "testoption";
 	np = of_find_node_opts_by_path("/", &options);
-	unittest(np && !options, "option clearing root node test failed\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
+	KUNIT_EXPECT_EQ_MSG(test, options, NULL,
+			    "option clearing root node test failed\n");
 	of_node_put(np);
 }
 
-static void __init of_unittest_dynamic(void)
+static void of_unittest_dynamic(struct kunit *test)
 {
 	struct device_node *np;
 	struct property *prop;
 
 	np = of_find_node_by_path("/testcase-data");
-	if (!np) {
-		pr_err("missing testcase data\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 
 	/* Array of 4 properties for the purpose of testing */
 	prop = kcalloc(4, sizeof(*prop), GFP_KERNEL);
-	if (!prop) {
-		unittest(0, "kzalloc() failed\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, prop);
 
 	/* Add a new property - should pass*/
 	prop->name = "new-property";
 	prop->value = "new-property-data";
 	prop->length = strlen(prop->value) + 1;
-	unittest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
+	KUNIT_EXPECT_EQ_MSG(test, of_add_property(np, prop), 0,
+			    "Adding a new property failed\n");
 
 	/* Try to add an existing property - should fail */
 	prop++;
 	prop->name = "new-property";
 	prop->value = "new-property-data-should-fail";
 	prop->length = strlen(prop->value) + 1;
-	unittest(of_add_property(np, prop) != 0,
-		 "Adding an existing property should have failed\n");
+	KUNIT_EXPECT_NE_MSG(test, of_add_property(np, prop), 0,
+			    "Adding an existing property should have failed\n");
 
 	/* Try to modify an existing property - should pass */
 	prop->value = "modify-property-data-should-pass";
 	prop->length = strlen(prop->value) + 1;
-	unittest(of_update_property(np, prop) == 0,
-		 "Updating an existing property should have passed\n");
+	KUNIT_EXPECT_EQ_MSG(
+		test, of_update_property(np, prop), 0,
+		"Updating an existing property should have passed\n");
 
 	/* Try to modify non-existent property - should pass*/
 	prop++;
 	prop->name = "modify-property";
 	prop->value = "modify-missing-property-data-should-pass";
 	prop->length = strlen(prop->value) + 1;
-	unittest(of_update_property(np, prop) == 0,
-		 "Updating a missing property should have passed\n");
+	KUNIT_EXPECT_EQ_MSG(test, of_update_property(np, prop), 0,
+			    "Updating a missing property should have passed\n");
 
 	/* Remove property - should pass */
-	unittest(of_remove_property(np, prop) == 0,
-		 "Removing a property should have passed\n");
+	KUNIT_EXPECT_EQ_MSG(test, of_remove_property(np, prop), 0,
+			    "Removing a property should have passed\n");
 
 	/* Adding very large property - should pass */
 	prop++;
 	prop->name = "large-property-PAGE_SIZEx8";
 	prop->length = PAGE_SIZE * 8;
 	prop->value = kzalloc(prop->length, GFP_KERNEL);
-	unittest(prop->value != NULL, "Unable to allocate large buffer\n");
-	if (prop->value)
-		unittest(of_add_property(np, prop) == 0,
-			 "Adding a large property should have passed\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, prop->value);
+	KUNIT_EXPECT_EQ_MSG(test, of_add_property(np, prop), 0,
+			    "Adding a large property should have passed\n");
 }
 
-static int __init of_unittest_check_node_linkage(struct device_node *np)
+static int of_unittest_check_node_linkage(struct device_node *np)
 {
 	struct device_node *child;
 	int count = 0, rc;
@@ -230,27 +233,30 @@ static int __init of_unittest_check_node_linkage(struct device_node *np)
 	return rc;
 }
 
-static void __init of_unittest_check_tree_linkage(void)
+static void of_unittest_check_tree_linkage(struct kunit *test)
 {
 	struct device_node *np;
 	int allnode_count = 0, child_count;
 
-	if (!of_root)
-		return;
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, of_root);
 
 	for_each_of_allnodes(np)
 		allnode_count++;
 	child_count = of_unittest_check_node_linkage(of_root);
 
-	unittest(child_count > 0, "Device node data structure is corrupted\n");
-	unittest(child_count == allnode_count,
-		 "allnodes list size (%i) doesn't match sibling lists size (%i)\n",
-		 allnode_count, child_count);
+	KUNIT_EXPECT_GT_MSG(test, child_count, 0,
+			    "Device node data structure is corrupted\n");
+	KUNIT_EXPECT_EQ_MSG(
+		test, child_count, allnode_count,
+		"allnodes list size (%i) doesn't match sibling lists size (%i)\n",
+		allnode_count, child_count);
 	pr_debug("allnodes list size (%i); sibling lists size (%i)\n", allnode_count, child_count);
 }
 
-static void __init of_unittest_printf_one(struct device_node *np, const char *fmt,
-					  const char *expected)
+static void of_unittest_printf_one(struct kunit *test,
+				   struct device_node *np,
+				   const char *fmt,
+				   const char *expected)
 {
 	unsigned char *buf;
 	int buf_size;
@@ -265,8 +271,12 @@ static void __init of_unittest_printf_one(struct device_node *np, const char *fm
 	memset(buf, 0xff, buf_size);
 	size = snprintf(buf, buf_size - 2, fmt, np);
 
-	/* use strcmp() instead of strncmp() here to be absolutely sure strings match */
-	unittest((strcmp(buf, expected) == 0) && (buf[size+1] == 0xff),
+	KUNIT_EXPECT_STREQ_MSG(
+		test, buf, expected,
+		"sprintf failed; fmt='%s' expected='%s' rslt='%s'\n",
+		fmt, expected, buf);
+	KUNIT_EXPECT_EQ_MSG(
+		test, buf[size+1], 0xff,
 		"sprintf failed; fmt='%s' expected='%s' rslt='%s'\n",
 		fmt, expected, buf);
 
@@ -276,44 +286,49 @@ static void __init of_unittest_printf_one(struct device_node *np, const char *fm
 		/* Clear the buffer, and make sure it works correctly still */
 		memset(buf, 0xff, buf_size);
 		snprintf(buf, size+1, fmt, np);
-		unittest(strncmp(buf, expected, size) == 0 && (buf[size+1] == 0xff),
+		KUNIT_EXPECT_STREQ_MSG(
+			test, buf, expected,
+			"snprintf failed; size=%i fmt='%s' expected='%s' rslt='%s'\n",
+			size, fmt, expected, buf);
+		KUNIT_EXPECT_EQ_MSG(
+			test, buf[size+1], 0xff,
 			"snprintf failed; size=%i fmt='%s' expected='%s' rslt='%s'\n",
 			size, fmt, expected, buf);
 	}
 	kfree(buf);
 }
 
-static void __init of_unittest_printf(void)
+static void of_unittest_printf(struct kunit *test)
 {
 	struct device_node *np;
 	const char *full_name = "/testcase-data/platform-tests/test-device@1/dev@100";
 	char phandle_str[16] = "";
 
 	np = of_find_node_by_path(full_name);
-	if (!np) {
-		unittest(np, "testcase data missing\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 
 	num_to_str(phandle_str, sizeof(phandle_str), np->phandle, 0);
 
-	of_unittest_printf_one(np, "%pOF",  full_name);
-	of_unittest_printf_one(np, "%pOFf", full_name);
-	of_unittest_printf_one(np, "%pOFn", "dev");
-	of_unittest_printf_one(np, "%2pOFn", "dev");
-	of_unittest_printf_one(np, "%5pOFn", "  dev");
-	of_unittest_printf_one(np, "%pOFnc", "dev:test-sub-device");
-	of_unittest_printf_one(np, "%pOFp", phandle_str);
-	of_unittest_printf_one(np, "%pOFP", "dev@100");
-	of_unittest_printf_one(np, "ABC %pOFP ABC", "ABC dev@100 ABC");
-	of_unittest_printf_one(np, "%10pOFP", "   dev@100");
-	of_unittest_printf_one(np, "%-10pOFP", "dev@100   ");
-	of_unittest_printf_one(of_root, "%pOFP", "/");
-	of_unittest_printf_one(np, "%pOFF", "----");
-	of_unittest_printf_one(np, "%pOFPF", "dev@100:----");
-	of_unittest_printf_one(np, "%pOFPFPc", "dev@100:----:dev@100:test-sub-device");
-	of_unittest_printf_one(np, "%pOFc", "test-sub-device");
-	of_unittest_printf_one(np, "%pOFC",
+	of_unittest_printf_one(test, np, "%pOF",  full_name);
+	of_unittest_printf_one(test, np, "%pOFf", full_name);
+	of_unittest_printf_one(test, np, "%pOFn", "dev");
+	of_unittest_printf_one(test, np, "%2pOFn", "dev");
+	of_unittest_printf_one(test, np, "%5pOFn", "  dev");
+	of_unittest_printf_one(test, np, "%pOFnc", "dev:test-sub-device");
+	of_unittest_printf_one(test, np, "%pOFp", phandle_str);
+	of_unittest_printf_one(test, np, "%pOFP", "dev@100");
+	of_unittest_printf_one(test, np, "ABC %pOFP ABC", "ABC dev@100 ABC");
+	of_unittest_printf_one(test, np, "%10pOFP", "   dev@100");
+	of_unittest_printf_one(test, np, "%-10pOFP", "dev@100   ");
+	of_unittest_printf_one(test, of_root, "%pOFP", "/");
+	of_unittest_printf_one(test, np, "%pOFF", "----");
+	of_unittest_printf_one(test, np, "%pOFPF", "dev@100:----");
+	of_unittest_printf_one(test,
+			       np,
+			       "%pOFPFPc",
+			       "dev@100:----:dev@100:test-sub-device");
+	of_unittest_printf_one(test, np, "%pOFc", "test-sub-device");
+	of_unittest_printf_one(test, np, "%pOFC",
 			"\"test-sub-device\",\"test-compat2\",\"test-compat3\"");
 }
 
@@ -323,7 +338,7 @@ struct node_hash {
 };
 
 static DEFINE_HASHTABLE(phandle_ht, 8);
-static void __init of_unittest_check_phandles(void)
+static void of_unittest_check_phandles(struct kunit *test)
 {
 	struct device_node *np;
 	struct node_hash *nh;
@@ -335,24 +350,26 @@ static void __init of_unittest_check_phandles(void)
 			continue;
 
 		hash_for_each_possible(phandle_ht, nh, node, np->phandle) {
+			KUNIT_EXPECT_NE_MSG(
+				test, nh->np->phandle, np->phandle,
+				"Duplicate phandle! %i used by %pOF and %pOF\n",
+				np->phandle, nh->np, np);
 			if (nh->np->phandle == np->phandle) {
-				pr_info("Duplicate phandle! %i used by %pOF and %pOF\n",
-					np->phandle, nh->np, np);
 				dup_count++;
 				break;
 			}
 		}
 
 		nh = kzalloc(sizeof(*nh), GFP_KERNEL);
-		if (WARN_ON(!nh))
-			return;
+		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, nh);
 
 		nh->np = np;
 		hash_add(phandle_ht, &nh->node, np->phandle);
 		phandle_count++;
 	}
-	unittest(dup_count == 0, "Found %i duplicates in %i phandles\n",
-		 dup_count, phandle_count);
+	KUNIT_EXPECT_EQ_MSG(test, dup_count, 0,
+			    "Found %i duplicates in %i phandles\n",
+			    dup_count, phandle_count);
 
 	/* Clean up */
 	hash_for_each_safe(phandle_ht, i, tmp, nh, node) {
@@ -361,20 +378,21 @@ static void __init of_unittest_check_phandles(void)
 	}
 }
 
-static void __init of_unittest_parse_phandle_with_args(void)
+static void of_unittest_parse_phandle_with_args(struct kunit *test)
 {
 	struct device_node *np;
 	struct of_phandle_args args;
-	int i, rc;
+	int i, rc = 0;
 
 	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
-	if (!np) {
-		pr_err("missing testcase data\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 
-	rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
-	unittest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		of_count_phandle_with_args(
+			np, "phandle-list", "#phandle-cells"),
+		7,
+		"of_count_phandle_with_args() returned %i, expected 7\n", rc);
 
 	for (i = 0; i < 8; i++) {
 		bool passed = true;
@@ -428,85 +446,91 @@ static void __init of_unittest_parse_phandle_with_args(void)
 			passed = false;
 		}
 
-		unittest(passed, "index %i - data error on node %pOF rc=%i\n",
-			 i, args.np, rc);
+		KUNIT_EXPECT_TRUE_MSG(
+			test, passed,
+			"index %i - data error on node %pOF rc=%i\n",
+			i, args.np, rc);
 	}
 
 	/* Check for missing list property */
 	memset(&args, 0, sizeof(args));
-	rc = of_parse_phandle_with_args(np, "phandle-list-missing",
-					"#phandle-cells", 0, &args);
-	unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
-	rc = of_count_phandle_with_args(np, "phandle-list-missing",
-					"#phandle-cells");
-	unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_parse_phandle_with_args(
+			np, "phandle-list-missing", "#phandle-cells", 0, &args),
+		-ENOENT);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_count_phandle_with_args(
+			np, "phandle-list-missing", "#phandle-cells"),
+		-ENOENT);
 
 	/* Check for missing cells property */
 	memset(&args, 0, sizeof(args));
-	rc = of_parse_phandle_with_args(np, "phandle-list",
-					"#phandle-cells-missing", 0, &args);
-	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
-	rc = of_count_phandle_with_args(np, "phandle-list",
-					"#phandle-cells-missing");
-	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_parse_phandle_with_args(
+			np, "phandle-list", "#phandle-cells-missing", 0, &args),
+		-EINVAL);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_count_phandle_with_args(
+			np, "phandle-list", "#phandle-cells-missing"),
+		-EINVAL);
 
 	/* Check for bad phandle in list */
 	memset(&args, 0, sizeof(args));
-	rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
-					"#phandle-cells", 0, &args);
-	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
-	rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
-					"#phandle-cells");
-	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
+					   "#phandle-cells", 0, &args),
+		-EINVAL);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_count_phandle_with_args(
+			np, "phandle-list-bad-phandle", "#phandle-cells"),
+		-EINVAL);
 
 	/* Check for incorrectly formed argument list */
 	memset(&args, 0, sizeof(args));
-	rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
-					"#phandle-cells", 1, &args);
-	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
-	rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
-					"#phandle-cells");
-	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_parse_phandle_with_args(np, "phandle-list-bad-args",
+					   "#phandle-cells", 1, &args),
+		-EINVAL);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_count_phandle_with_args(
+			np, "phandle-list-bad-args", "#phandle-cells"),
+		-EINVAL);
 }
 
-static void __init of_unittest_parse_phandle_with_args_map(void)
+static void of_unittest_parse_phandle_with_args_map(struct kunit *test)
 {
 	struct device_node *np, *p0, *p1, *p2, *p3;
 	struct of_phandle_args args;
 	int i, rc;
 
 	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-b");
-	if (!np) {
-		pr_err("missing testcase data\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 
 	p0 = of_find_node_by_path("/testcase-data/phandle-tests/provider0");
-	if (!p0) {
-		pr_err("missing testcase data\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p0);
 
 	p1 = of_find_node_by_path("/testcase-data/phandle-tests/provider1");
-	if (!p1) {
-		pr_err("missing testcase data\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p1);
 
 	p2 = of_find_node_by_path("/testcase-data/phandle-tests/provider2");
-	if (!p2) {
-		pr_err("missing testcase data\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p2);
 
 	p3 = of_find_node_by_path("/testcase-data/phandle-tests/provider3");
-	if (!p3) {
-		pr_err("missing testcase data\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p3);
 
-	rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
-	unittest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
+	KUNIT_EXPECT_EQ(test,
+		       of_count_phandle_with_args(np,
+						  "phandle-list",
+						  "#phandle-cells"),
+		       7);
 
 	for (i = 0; i < 8; i++) {
 		bool passed = true;
@@ -564,121 +588,186 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
 			passed = false;
 		}
 
-		unittest(passed, "index %i - data error on node %s rc=%i\n",
-			 i, args.np->full_name, rc);
+		KUNIT_EXPECT_TRUE_MSG(
+			test, passed,
+			"index %i - data error on node %s rc=%i\n",
+			i, (args.np ? args.np->full_name : "missing np"), rc);
 	}
 
 	/* Check for missing list property */
 	memset(&args, 0, sizeof(args));
-	rc = of_parse_phandle_with_args_map(np, "phandle-list-missing",
-					    "phandle", 0, &args);
-	unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_parse_phandle_with_args_map(
+			np, "phandle-list-missing", "phandle", 0, &args),
+		-ENOENT);
 
 	/* Check for missing cells,map,mask property */
 	memset(&args, 0, sizeof(args));
-	rc = of_parse_phandle_with_args_map(np, "phandle-list",
-					    "phandle-missing", 0, &args);
-	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_parse_phandle_with_args_map(
+			np, "phandle-list", "phandle-missing", 0, &args),
+		-EINVAL);
 
 	/* Check for bad phandle in list */
 	memset(&args, 0, sizeof(args));
-	rc = of_parse_phandle_with_args_map(np, "phandle-list-bad-phandle",
-					    "phandle", 0, &args);
-	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_parse_phandle_with_args_map(
+			np, "phandle-list-bad-phandle", "phandle", 0, &args),
+		-EINVAL);
 
 	/* Check for incorrectly formed argument list */
 	memset(&args, 0, sizeof(args));
-	rc = of_parse_phandle_with_args_map(np, "phandle-list-bad-args",
-					    "phandle", 1, &args);
-	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_parse_phandle_with_args_map(
+			np, "phandle-list-bad-args", "phandle", 1, &args),
+		-EINVAL);
 }
 
-static void __init of_unittest_property_string(void)
+static void of_unittest_property_string(struct kunit *test)
 {
 	const char *strings[4];
 	struct device_node *np;
 	int rc;
 
 	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
-	if (!np) {
-		pr_err("No testcase data in device tree\n");
-		return;
-	}
-
-	rc = of_property_match_string(np, "phandle-list-names", "first");
-	unittest(rc == 0, "first expected:0 got:%i\n", rc);
-	rc = of_property_match_string(np, "phandle-list-names", "second");
-	unittest(rc == 1, "second expected:1 got:%i\n", rc);
-	rc = of_property_match_string(np, "phandle-list-names", "third");
-	unittest(rc == 2, "third expected:2 got:%i\n", rc);
-	rc = of_property_match_string(np, "phandle-list-names", "fourth");
-	unittest(rc == -ENODATA, "unmatched string; rc=%i\n", rc);
-	rc = of_property_match_string(np, "missing-property", "blah");
-	unittest(rc == -EINVAL, "missing property; rc=%i\n", rc);
-	rc = of_property_match_string(np, "empty-property", "blah");
-	unittest(rc == -ENODATA, "empty property; rc=%i\n", rc);
-	rc = of_property_match_string(np, "unterminated-string", "blah");
-	unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
+
+	KUNIT_EXPECT_EQ(
+		test,
+		of_property_match_string(np, "phandle-list-names", "first"),
+		0);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_property_match_string(np, "phandle-list-names", "second"),
+		1);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_property_match_string(np, "phandle-list-names", "third"),
+		2);
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		of_property_match_string(np, "phandle-list-names", "fourth"),
+		-ENODATA,
+		"unmatched string");
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		of_property_match_string(np, "missing-property", "blah"),
+		-EINVAL,
+		"missing property");
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		of_property_match_string(np, "empty-property", "blah"),
+		-ENODATA,
+		"empty property");
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		of_property_match_string(np, "unterminated-string", "blah"),
+		-EILSEQ,
+		"unterminated string");
 
 	/* of_property_count_strings() tests */
-	rc = of_property_count_strings(np, "string-property");
-	unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
-	rc = of_property_count_strings(np, "phandle-list-names");
-	unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
-	rc = of_property_count_strings(np, "unterminated-string");
-	unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
-	rc = of_property_count_strings(np, "unterminated-string-list");
-	unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
+	KUNIT_EXPECT_EQ(test,
+			of_property_count_strings(np, "string-property"), 1);
+	KUNIT_EXPECT_EQ(test,
+			of_property_count_strings(np, "phandle-list-names"), 3);
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		of_property_count_strings(np, "unterminated-string"), -EILSEQ,
+		"unterminated string");
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		of_property_count_strings(np, "unterminated-string-list"),
+		-EILSEQ,
+		"unterminated string array");
 
 	/* of_property_read_string_index() tests */
 	rc = of_property_read_string_index(np, "string-property", 0, strings);
-	unittest(rc == 0 && !strcmp(strings[0], "foobar"), "of_property_read_string_index() failure; rc=%i\n", rc);
+	KUNIT_ASSERT_EQ(test, rc, 0);
+	KUNIT_EXPECT_STREQ(test, strings[0], "foobar");
+
 	strings[0] = NULL;
 	rc = of_property_read_string_index(np, "string-property", 1, strings);
-	unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
+	KUNIT_EXPECT_EQ(test, rc, -ENODATA);
+	KUNIT_EXPECT_EQ(test, strings[0], NULL);
+
 	rc = of_property_read_string_index(np, "phandle-list-names", 0, strings);
-	unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
+	KUNIT_ASSERT_EQ(test, rc, 0);
+	KUNIT_EXPECT_STREQ(test, strings[0], "first");
+
 	rc = of_property_read_string_index(np, "phandle-list-names", 1, strings);
-	unittest(rc == 0 && !strcmp(strings[0], "second"), "of_property_read_string_index() failure; rc=%i\n", rc);
+	KUNIT_ASSERT_EQ(test, rc, 0);
+	KUNIT_EXPECT_STREQ(test, strings[0], "second");
+
 	rc = of_property_read_string_index(np, "phandle-list-names", 2, strings);
-	unittest(rc == 0 && !strcmp(strings[0], "third"), "of_property_read_string_index() failure; rc=%i\n", rc);
+	KUNIT_ASSERT_EQ(test, rc, 0);
+	KUNIT_EXPECT_STREQ(test, strings[0], "third");
+
 	strings[0] = NULL;
 	rc = of_property_read_string_index(np, "phandle-list-names", 3, strings);
-	unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
+	KUNIT_EXPECT_EQ(test, rc, -ENODATA);
+	KUNIT_EXPECT_EQ(test, strings[0], NULL);
+
 	strings[0] = NULL;
 	rc = of_property_read_string_index(np, "unterminated-string", 0, strings);
-	unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
+	KUNIT_EXPECT_EQ(test, rc, -EILSEQ);
+	KUNIT_EXPECT_EQ(test, strings[0], NULL);
+
 	rc = of_property_read_string_index(np, "unterminated-string-list", 0, strings);
-	unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
+	KUNIT_ASSERT_EQ(test, rc, 0);
+	KUNIT_EXPECT_STREQ(test, strings[0], "first");
+
 	strings[0] = NULL;
 	rc = of_property_read_string_index(np, "unterminated-string-list", 2, strings); /* should fail */
-	unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
-	strings[1] = NULL;
+	KUNIT_EXPECT_EQ(test, rc, -EILSEQ);
+	KUNIT_EXPECT_EQ(test, strings[0], NULL);
 
 	/* of_property_read_string_array() tests */
-	rc = of_property_read_string_array(np, "string-property", strings, 4);
-	unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
-	rc = of_property_read_string_array(np, "phandle-list-names", strings, 4);
-	unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
-	rc = of_property_read_string_array(np, "unterminated-string", strings, 4);
-	unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
+	strings[1] = NULL;
+	KUNIT_EXPECT_EQ(
+		test,
+		of_property_read_string_array(
+			np, "string-property", strings, 4),
+		1);
+	KUNIT_EXPECT_EQ(
+		test,
+		of_property_read_string_array(
+			np, "phandle-list-names", strings, 4),
+		3);
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		of_property_read_string_array(
+			np, "unterminated-string", strings, 4),
+		-EILSEQ,
+		"unterminated string");
 	/* -- An incorrectly formed string should cause a failure */
-	rc = of_property_read_string_array(np, "unterminated-string-list", strings, 4);
-	unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
+	KUNIT_EXPECT_EQ_MSG(
+		test,
+		of_property_read_string_array(
+			np, "unterminated-string-list", strings, 4),
+		-EILSEQ,
+		"unterminated string array");
 	/* -- parsing the correctly formed strings should still work: */
 	strings[2] = NULL;
 	rc = of_property_read_string_array(np, "unterminated-string-list", strings, 2);
-	unittest(rc == 2 && strings[2] == NULL, "of_property_read_string_array() failure; rc=%i\n", rc);
+	KUNIT_EXPECT_EQ(test, rc, 2);
+	KUNIT_EXPECT_EQ(test, strings[2], NULL);
+
 	strings[1] = NULL;
 	rc = of_property_read_string_array(np, "phandle-list-names", strings, 1);
-	unittest(rc == 1 && strings[1] == NULL, "Overwrote end of string array; rc=%i, str='%s'\n", rc, strings[1]);
+	KUNIT_ASSERT_EQ(test, rc, 1);
+	KUNIT_EXPECT_EQ_MSG(test, strings[1], NULL,
+			    "Overwrote end of string array");
 }
 
 #define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
 			(p1)->value && (p2)->value && \
 			!memcmp((p1)->value, (p2)->value, (p1)->length) && \
 			!strcmp((p1)->name, (p2)->name))
-static void __init of_unittest_property_copy(void)
+static void of_unittest_property_copy(struct kunit *test)
 {
 #ifdef CONFIG_OF_DYNAMIC
 	struct property p1 = { .name = "p1", .length = 0, .value = "" };
@@ -686,20 +775,24 @@ static void __init of_unittest_property_copy(void)
 	struct property *new;
 
 	new = __of_prop_dup(&p1, GFP_KERNEL);
-	unittest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new);
+	KUNIT_EXPECT_TRUE_MSG(test, propcmp(&p1, new),
+			      "empty property didn't copy correctly");
 	kfree(new->value);
 	kfree(new->name);
 	kfree(new);
 
 	new = __of_prop_dup(&p2, GFP_KERNEL);
-	unittest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new);
+	KUNIT_EXPECT_TRUE_MSG(test, propcmp(&p2, new),
+			      "non-empty property didn't copy correctly");
 	kfree(new->value);
 	kfree(new->name);
 	kfree(new);
 #endif
 }
 
-static void __init of_unittest_changeset(void)
+static void of_unittest_changeset(struct kunit *test)
 {
 #ifdef CONFIG_OF_DYNAMIC
 	struct property *ppadd, padd = { .name = "prop-add", .length = 1, .value = "" };
@@ -712,32 +805,32 @@ static void __init of_unittest_changeset(void)
 	struct of_changeset chgset;
 
 	n1 = __of_node_dup(NULL, "n1");
-	unittest(n1, "testcase setup failure\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, n1);
 
 	n2 = __of_node_dup(NULL, "n2");
-	unittest(n2, "testcase setup failure\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, n2);
 
 	n21 = __of_node_dup(NULL, "n21");
-	unittest(n21, "testcase setup failure %p\n", n21);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, n21);
 
 	nchangeset = of_find_node_by_path("/testcase-data/changeset");
 	nremove = of_get_child_by_name(nchangeset, "node-remove");
-	unittest(nremove, "testcase setup failure\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, nremove);
 
 	ppadd = __of_prop_dup(&padd, GFP_KERNEL);
-	unittest(ppadd, "testcase setup failure\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ppadd);
 
 	ppname_n1  = __of_prop_dup(&pname_n1, GFP_KERNEL);
-	unittest(ppname_n1, "testcase setup failure\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ppname_n1);
 
 	ppname_n2  = __of_prop_dup(&pname_n2, GFP_KERNEL);
-	unittest(ppname_n2, "testcase setup failure\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ppname_n2);
 
 	ppname_n21 = __of_prop_dup(&pname_n21, GFP_KERNEL);
-	unittest(ppname_n21, "testcase setup failure\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ppname_n21);
 
 	ppupdate = __of_prop_dup(&pupdate, GFP_KERNEL);
-	unittest(ppupdate, "testcase setup failure\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ppupdate);
 
 	parent = nchangeset;
 	n1->parent = parent;
@@ -745,54 +838,72 @@ static void __init of_unittest_changeset(void)
 	n21->parent = n2;
 
 	ppremove = of_find_property(parent, "prop-remove", NULL);
-	unittest(ppremove, "failed to find removal prop");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ppremove);
 
 	of_changeset_init(&chgset);
 
-	unittest(!of_changeset_attach_node(&chgset, n1), "fail attach n1\n");
-	unittest(!of_changeset_add_property(&chgset, n1, ppname_n1), "fail add prop name\n");
-
-	unittest(!of_changeset_attach_node(&chgset, n2), "fail attach n2\n");
-	unittest(!of_changeset_add_property(&chgset, n2, ppname_n2), "fail add prop name\n");
-
-	unittest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
-	unittest(!of_changeset_add_property(&chgset, n21, ppname_n21), "fail add prop name\n");
-
-	unittest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
-
-	unittest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop prop-add\n");
-	unittest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
-	unittest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
-
-	unittest(!of_changeset_apply(&chgset), "apply failed\n");
+	KUNIT_EXPECT_FALSE_MSG(test, of_changeset_attach_node(&chgset, n1),
+			       "fail attach n1\n");
+	KUNIT_EXPECT_FALSE_MSG(
+		test, of_changeset_add_property(&chgset, n1, ppname_n1),
+		"fail add prop name\n");
+
+	KUNIT_EXPECT_FALSE_MSG(test, of_changeset_attach_node(&chgset, n2),
+			       "fail attach n2\n");
+	KUNIT_EXPECT_FALSE_MSG(
+		test, of_changeset_add_property(&chgset, n2, ppname_n2),
+			       "fail add prop name\n");
+
+	KUNIT_EXPECT_FALSE_MSG(test, of_changeset_detach_node(&chgset, nremove),
+			       "fail remove node\n");
+	KUNIT_EXPECT_FALSE_MSG(
+		test, of_changeset_add_property(&chgset, n21, ppname_n21),
+		"fail add prop name\n");
+
+	KUNIT_EXPECT_FALSE_MSG(test, of_changeset_attach_node(&chgset, n21),
+			       "fail attach n21\n");
+
+	KUNIT_EXPECT_FALSE_MSG(
+		test,
+		of_changeset_add_property(&chgset, parent, ppadd),
+		"fail add prop prop-add\n");
+	KUNIT_EXPECT_FALSE_MSG(
+		test,
+		of_changeset_update_property(&chgset, parent, ppupdate),
+		"fail update prop\n");
+	KUNIT_EXPECT_FALSE_MSG(
+		test,
+		of_changeset_remove_property(&chgset, parent, ppremove),
+		"fail remove prop\n");
+
+	KUNIT_EXPECT_FALSE_MSG(test, of_changeset_apply(&chgset),
+			       "apply failed\n");
 
 	of_node_put(nchangeset);
 
 	/* Make sure node names are constructed correctly */
-	unittest((np = of_find_node_by_path("/testcase-data/changeset/n2/n21")),
-		 "'%pOF' not added\n", n21);
+	KUNIT_EXPECT_NOT_ERR_OR_NULL_MSG(
+		test,
+		np = of_find_node_by_path("/testcase-data/changeset/n2/n21"),
+		"'%pOF' not added\n", n21);
 	of_node_put(np);
 
-	unittest(!of_changeset_revert(&chgset), "revert failed\n");
+	KUNIT_EXPECT_FALSE(test, of_changeset_revert(&chgset));
 
 	of_changeset_destroy(&chgset);
 #endif
 }
 
-static void __init of_unittest_parse_interrupts(void)
+static void of_unittest_parse_interrupts(struct kunit *test)
 {
 	struct device_node *np;
 	struct of_phandle_args args;
 	int i, rc;
 
-	if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
-		return;
+	KUNIT_ASSERT_FALSE(test, of_irq_workarounds & OF_IMAP_OLDWORLD_MAC);
 
 	np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
-	if (!np) {
-		pr_err("missing testcase data\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 
 	for (i = 0; i < 4; i++) {
 		bool passed = true;
@@ -804,16 +915,15 @@ static void __init of_unittest_parse_interrupts(void)
 		passed &= (args.args_count == 1);
 		passed &= (args.args[0] == (i + 1));
 
-		unittest(passed, "index %i - data error on node %pOF rc=%i\n",
-			 i, args.np, rc);
+		KUNIT_EXPECT_TRUE_MSG(
+			test, passed,
+			"index %i - data error on node %pOF rc=%i\n",
+			i, args.np, rc);
 	}
 	of_node_put(np);
 
 	np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
-	if (!np) {
-		pr_err("missing testcase data\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 
 	for (i = 0; i < 4; i++) {
 		bool passed = true;
@@ -850,26 +960,24 @@ static void __init of_unittest_parse_interrupts(void)
 		default:
 			passed = false;
 		}
-		unittest(passed, "index %i - data error on node %pOF rc=%i\n",
-			 i, args.np, rc);
+		KUNIT_EXPECT_TRUE_MSG(
+			test, passed,
+			"index %i - data error on node %pOF rc=%i\n",
+			i, args.np, rc);
 	}
 	of_node_put(np);
 }
 
-static void __init of_unittest_parse_interrupts_extended(void)
+static void of_unittest_parse_interrupts_extended(struct kunit *test)
 {
 	struct device_node *np;
 	struct of_phandle_args args;
 	int i, rc;
 
-	if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
-		return;
+	KUNIT_ASSERT_FALSE(test, of_irq_workarounds & OF_IMAP_OLDWORLD_MAC);
 
 	np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
-	if (!np) {
-		pr_err("missing testcase data\n");
-		return;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 
 	for (i = 0; i < 7; i++) {
 		bool passed = true;
@@ -924,8 +1032,10 @@ static void __init of_unittest_parse_interrupts_extended(void)
 			passed = false;
 		}
 
-		unittest(passed, "index %i - data error on node %pOF rc=%i\n",
-			 i, args.np, rc);
+		KUNIT_EXPECT_TRUE_MSG(
+			test, passed,
+			"index %i - data error on node %pOF rc=%i\n",
+			i, args.np, rc);
 	}
 	of_node_put(np);
 }
@@ -965,7 +1075,7 @@ static struct {
 	{ .path = "/testcase-data/match-node/name9", .data = "K", },
 };
 
-static void __init of_unittest_match_node(void)
+static void of_unittest_match_node(struct kunit *test)
 {
 	struct device_node *np;
 	const struct of_device_id *match;
@@ -973,26 +1083,19 @@ static void __init of_unittest_match_node(void)
 
 	for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
 		np = of_find_node_by_path(match_node_tests[i].path);
-		if (!np) {
-			unittest(0, "missing testcase node %s\n",
-				match_node_tests[i].path);
-			continue;
-		}
+		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 
 		match = of_match_node(match_node_table, np);
-		if (!match) {
-			unittest(0, "%s didn't match anything\n",
-				match_node_tests[i].path);
-			continue;
-		}
+		KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, np,
+						 "%s didn't match anything",
+						 match_node_tests[i].path);
 
-		if (strcmp(match->data, match_node_tests[i].data) != 0) {
-			unittest(0, "%s got wrong match. expected %s, got %s\n",
-				match_node_tests[i].path, match_node_tests[i].data,
-				(const char *)match->data);
-			continue;
-		}
-		unittest(1, "passed");
+		KUNIT_EXPECT_STREQ_MSG(
+			test,
+			match->data, match_node_tests[i].data,
+			"%s got wrong match. expected %s, got %s\n",
+			match_node_tests[i].path, match_node_tests[i].data,
+			(const char *)match->data);
 	}
 }
 
@@ -1004,9 +1107,9 @@ static struct resource test_bus_res = {
 static const struct platform_device_info test_bus_info = {
 	.name = "unittest-bus",
 };
-static void __init of_unittest_platform_populate(void)
+static void of_unittest_platform_populate(struct kunit *test)
 {
-	int irq, rc;
+	int irq;
 	struct device_node *np, *child, *grandchild;
 	struct platform_device *pdev, *test_bus;
 	const struct of_device_id match[] = {
@@ -1020,32 +1123,27 @@ static void __init of_unittest_platform_populate(void)
 	/* Test that a missing irq domain returns -EPROBE_DEFER */
 	np = of_find_node_by_path("/testcase-data/testcase-device1");
 	pdev = of_find_device_by_node(np);
-	unittest(pdev, "device 1 creation failed\n");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
 
 	if (!(of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)) {
 		irq = platform_get_irq(pdev, 0);
-		unittest(irq == -EPROBE_DEFER,
-			 "device deferred probe failed - %d\n", irq);
+		KUNIT_ASSERT_EQ(test, irq, -EPROBE_DEFER);
 
 		/* Test that a parsing failure does not return -EPROBE_DEFER */
 		np = of_find_node_by_path("/testcase-data/testcase-device2");
 		pdev = of_find_device_by_node(np);
-		unittest(pdev, "device 2 creation failed\n");
+		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
 		irq = platform_get_irq(pdev, 0);
-		unittest(irq < 0 && irq != -EPROBE_DEFER,
-			 "device parsing error failed - %d\n", irq);
+		KUNIT_ASSERT_TRUE_MSG(test, irq < 0 && irq != -EPROBE_DEFER,
+				      "device parsing error failed - %d\n",
+				      irq);
 	}
 
 	np = of_find_node_by_path("/testcase-data/platform-tests");
-	unittest(np, "No testcase data in device tree\n");
-	if (!np)
-		return;
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
 
 	test_bus = platform_device_register_full(&test_bus_info);
-	rc = PTR_ERR_OR_ZERO(test_bus);
-	unittest(!rc, "testbus registration failed; rc=%i\n", rc);
-	if (rc)
-		return;
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, test_bus);
 	test_bus->dev.of_node = np;
 
 	/*
@@ -1060,17 +1158,19 @@ static void __init of_unittest_platform_populate(void)
 	of_platform_populate(np, match, NULL, &test_bus->dev);
 	for_each_child_of_node(np, child) {
 		for_each_child_of_node(child, grandchild)
-			unittest(of_find_device_by_node(grandchild),
-				 "Could not create device for node '%pOFn'\n",
-				 grandchild);
+			KUNIT_EXPECT_TRUE_MSG(
+				test, of_find_device_by_node(grandchild),
+				"Could not create device for node '%pOFn'\n",
+				grandchild);
 	}
 
 	of_platform_depopulate(&test_bus->dev);
 	for_each_child_of_node(np, child) {
 		for_each_child_of_node(child, grandchild)
-			unittest(!of_find_device_by_node(grandchild),
-				 "device didn't get destroyed '%pOFn'\n",
-				 grandchild);
+			KUNIT_EXPECT_FALSE_MSG(
+				test, of_find_device_by_node(grandchild),
+				"device didn't get destroyed '%pOFn'\n",
+				grandchild);
 	}
 
 	platform_device_unregister(test_bus);
@@ -1171,7 +1271,7 @@ static void attach_node_and_children(struct device_node *np)
  *	unittest_data_add - Reads, copies data from
  *	linked tree and attaches it to the live tree
  */
-static int __init unittest_data_add(void)
+static int unittest_data_add(void)
 {
 	void *unittest_data;
 	struct device_node *unittest_data_node, *np;
@@ -1242,7 +1342,7 @@ static int __init unittest_data_add(void)
 }
 
 #ifdef CONFIG_OF_OVERLAY
-static int __init overlay_data_apply(const char *overlay_name, int *overlay_id);
+static int overlay_data_apply(const char *overlay_name, int *overlay_id);
 
 static int unittest_probe(struct platform_device *pdev)
 {
@@ -1471,172 +1571,146 @@ static void of_unittest_destroy_tracked_overlays(void)
 	} while (defers > 0);
 }
 
-static int __init of_unittest_apply_overlay(int overlay_nr, int *overlay_id)
+static int of_unittest_apply_overlay(struct kunit *test,
+				     int overlay_nr,
+				     int *overlay_id)
 {
 	const char *overlay_name;
 
 	overlay_name = overlay_name_from_nr(overlay_nr);
 
-	if (!overlay_data_apply(overlay_name, overlay_id)) {
-		unittest(0, "could not apply overlay \"%s\"\n",
-				overlay_name);
-		return -EFAULT;
-	}
+	KUNIT_ASSERT_TRUE_MSG(test,
+			      overlay_data_apply(overlay_name, overlay_id),
+			      "could not apply overlay \"%s\"\n", overlay_name);
 	of_unittest_track_overlay(*overlay_id);
 
 	return 0;
 }
 
 /* apply an overlay while checking before and after states */
-static int __init of_unittest_apply_overlay_check(int overlay_nr,
+static int of_unittest_apply_overlay_check(struct kunit *test, int overlay_nr,
 		int unittest_nr, int before, int after,
 		enum overlay_type ovtype)
 {
 	int ret, ovcs_id;
 
 	/* unittest device must not be in before state */
-	if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
-		unittest(0, "%s with device @\"%s\" %s\n",
-				overlay_name_from_nr(overlay_nr),
-				unittest_path(unittest_nr, ovtype),
-				!before ? "enabled" : "disabled");
-		return -EINVAL;
-	}
+	KUNIT_ASSERT_EQ_MSG(
+		test, of_unittest_device_exists(unittest_nr, ovtype), before,
+		"%s with device @\"%s\" %s\n", overlay_name_from_nr(overlay_nr),
+		unittest_path(unittest_nr, ovtype),
+		!before ? "enabled" : "disabled");
 
 	ovcs_id = 0;
-	ret = of_unittest_apply_overlay(overlay_nr, &ovcs_id);
+	ret = of_unittest_apply_overlay(test, overlay_nr, &ovcs_id);
 	if (ret != 0) {
-		/* of_unittest_apply_overlay already called unittest() */
+		/* of_unittest_apply_overlay already set expectation */
 		return ret;
 	}
 
 	/* unittest device must be to set to after state */
-	if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
-		unittest(0, "%s failed to create @\"%s\" %s\n",
-				overlay_name_from_nr(overlay_nr),
-				unittest_path(unittest_nr, ovtype),
-				!after ? "enabled" : "disabled");
-		return -EINVAL;
-	}
+	KUNIT_ASSERT_EQ_MSG(
+		test, of_unittest_device_exists(unittest_nr, ovtype), after,
+		"%s failed to create @\"%s\" %s\n",
+		overlay_name_from_nr(overlay_nr),
+		unittest_path(unittest_nr, ovtype),
+		!after ? "enabled" : "disabled");
 
 	return 0;
 }
 
 /* apply an overlay and then revert it while checking before, after states */
-static int __init of_unittest_apply_revert_overlay_check(int overlay_nr,
+static int of_unittest_apply_revert_overlay_check(
+		struct kunit *test, int overlay_nr,
 		int unittest_nr, int before, int after,
 		enum overlay_type ovtype)
 {
 	int ret, ovcs_id;
 
 	/* unittest device must be in before state */
-	if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
-		unittest(0, "%s with device @\"%s\" %s\n",
-				overlay_name_from_nr(overlay_nr),
-				unittest_path(unittest_nr, ovtype),
-				!before ? "enabled" : "disabled");
-		return -EINVAL;
-	}
+	KUNIT_ASSERT_EQ_MSG(
+		test, of_unittest_device_exists(unittest_nr, ovtype), before,
+		"%s with device @\"%s\" %s\n", overlay_name_from_nr(overlay_nr),
+		unittest_path(unittest_nr, ovtype),
+		!before ? "enabled" : "disabled");
 
 	/* apply the overlay */
 	ovcs_id = 0;
-	ret = of_unittest_apply_overlay(overlay_nr, &ovcs_id);
+	ret = of_unittest_apply_overlay(test, overlay_nr, &ovcs_id);
 	if (ret != 0) {
-		/* of_unittest_apply_overlay already called unittest() */
+		/* of_unittest_apply_overlay already set expectation. */
 		return ret;
 	}
 
 	/* unittest device must be in after state */
-	if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
-		unittest(0, "%s failed to create @\"%s\" %s\n",
-				overlay_name_from_nr(overlay_nr),
-				unittest_path(unittest_nr, ovtype),
-				!after ? "enabled" : "disabled");
-		return -EINVAL;
-	}
-
-	ret = of_overlay_remove(&ovcs_id);
-	if (ret != 0) {
-		unittest(0, "%s failed to be destroyed @\"%s\"\n",
-				overlay_name_from_nr(overlay_nr),
-				unittest_path(unittest_nr, ovtype));
-		return ret;
-	}
+	KUNIT_ASSERT_EQ_MSG(
+		test, of_unittest_device_exists(unittest_nr, ovtype), after,
+		"%s failed to create @\"%s\" %s\n",
+		overlay_name_from_nr(overlay_nr),
+		unittest_path(unittest_nr, ovtype),
+		!after ? "enabled" : "disabled");
+
+	KUNIT_ASSERT_EQ_MSG(test, of_overlay_remove(&ovcs_id), 0,
+			    "%s failed to be destroyed @\"%s\"\n",
+			    overlay_name_from_nr(overlay_nr),
+			    unittest_path(unittest_nr, ovtype));
 
 	/* unittest device must be again in before state */
-	if (of_unittest_device_exists(unittest_nr, PDEV_OVERLAY) != before) {
-		unittest(0, "%s with device @\"%s\" %s\n",
-				overlay_name_from_nr(overlay_nr),
-				unittest_path(unittest_nr, ovtype),
-				!before ? "enabled" : "disabled");
-		return -EINVAL;
-	}
+	KUNIT_ASSERT_EQ_MSG(
+		test,
+		of_unittest_device_exists(unittest_nr, PDEV_OVERLAY), before,
+		"%s with device @\"%s\" %s\n",
+		overlay_name_from_nr(overlay_nr),
+		unittest_path(unittest_nr, ovtype),
+		!before ? "enabled" : "disabled");
 
 	return 0;
 }
 
 /* test activation of device */
-static void __init of_unittest_overlay_0(void)
+static void of_unittest_overlay_0(struct kunit *test)
 {
 	/* device should enable */
-	if (of_unittest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY))
-		return;
-
-	unittest(1, "overlay test %d passed\n", 0);
+	of_unittest_apply_overlay_check(test, 0, 0, 0, 1, PDEV_OVERLAY);
 }
 
 /* test deactivation of device */
-static void __init of_unittest_overlay_1(void)
+static void of_unittest_overlay_1(struct kunit *test)
 {
 	/* device should disable */
-	if (of_unittest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY))
-		return;
-
-	unittest(1, "overlay test %d passed\n", 1);
+	of_unittest_apply_overlay_check(test, 1, 1, 1, 0, PDEV_OVERLAY);
 }
 
 /* test activation of device */
-static void __init of_unittest_overlay_2(void)
+static void of_unittest_overlay_2(struct kunit *test)
 {
 	/* device should enable */
-	if (of_unittest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY))
-		return;
-
-	unittest(1, "overlay test %d passed\n", 2);
+	of_unittest_apply_overlay_check(test, 2, 2, 0, 1, PDEV_OVERLAY);
 }
 
 /* test deactivation of device */
-static void __init of_unittest_overlay_3(void)
+static void of_unittest_overlay_3(struct kunit *test)
 {
 	/* device should disable */
-	if (of_unittest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY))
-		return;
-
-	unittest(1, "overlay test %d passed\n", 3);
+	of_unittest_apply_overlay_check(test, 3, 3, 1, 0, PDEV_OVERLAY);
 }
 
 /* test activation of a full device node */
-static void __init of_unittest_overlay_4(void)
+static void of_unittest_overlay_4(struct kunit *test)
 {
 	/* device should disable */
-	if (of_unittest_apply_overlay_check(4, 4, 0, 1, PDEV_OVERLAY))
-		return;
-
-	unittest(1, "overlay test %d passed\n", 4);
+	of_unittest_apply_overlay_check(test, 4, 4, 0, 1, PDEV_OVERLAY);
 }
 
 /* test overlay apply/revert sequence */
-static void __init of_unittest_overlay_5(void)
+static void of_unittest_overlay_5(struct kunit *test)
 {
 	/* device should disable */
-	if (of_unittest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY))
-		return;
-
-	unittest(1, "overlay test %d passed\n", 5);
+	of_unittest_apply_revert_overlay_check(test, 5, 5, 0, 1, PDEV_OVERLAY);
 }
 
 /* test overlay application in sequence */
-static void __init of_unittest_overlay_6(void)
+static void of_unittest_overlay_6(struct kunit *test)
 {
 	int i, ov_id[2], ovcs_id;
 	int overlay_nr = 6, unittest_nr = 6;
@@ -1645,74 +1719,67 @@ static void __init of_unittest_overlay_6(void)
 
 	/* unittest device must be in before state */
 	for (i = 0; i < 2; i++) {
-		if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
-				!= before) {
-			unittest(0, "%s with device @\"%s\" %s\n",
-					overlay_name_from_nr(overlay_nr + i),
-					unittest_path(unittest_nr + i,
-						PDEV_OVERLAY),
-					!before ? "enabled" : "disabled");
-			return;
-		}
+		KUNIT_ASSERT_EQ_MSG(test,
+				    of_unittest_device_exists(unittest_nr + i,
+							      PDEV_OVERLAY),
+				    before,
+				    "%s with device @\"%s\" %s\n",
+				    overlay_name_from_nr(overlay_nr + i),
+				    unittest_path(unittest_nr + i,
+						  PDEV_OVERLAY),
+				    !before ? "enabled" : "disabled");
 	}
 
 	/* apply the overlays */
 	for (i = 0; i < 2; i++) {
-
 		overlay_name = overlay_name_from_nr(overlay_nr + i);
 
-		if (!overlay_data_apply(overlay_name, &ovcs_id)) {
-			unittest(0, "could not apply overlay \"%s\"\n",
-					overlay_name);
-			return;
-		}
+		KUNIT_ASSERT_TRUE_MSG(
+			test, overlay_data_apply(overlay_name, &ovcs_id),
+			"could not apply overlay \"%s\"\n", overlay_name);
 		ov_id[i] = ovcs_id;
 		of_unittest_track_overlay(ov_id[i]);
 	}
 
 	for (i = 0; i < 2; i++) {
 		/* unittest device must be in after state */
-		if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
-				!= after) {
-			unittest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
-					overlay_name_from_nr(overlay_nr + i),
-					unittest_path(unittest_nr + i,
-						PDEV_OVERLAY),
-					!after ? "enabled" : "disabled");
-			return;
-		}
+		KUNIT_ASSERT_EQ_MSG(test,
+				    of_unittest_device_exists(unittest_nr + i,
+							      PDEV_OVERLAY),
+				    after,
+				    "overlay @\"%s\" failed @\"%s\" %s\n",
+				    overlay_name_from_nr(overlay_nr + i),
+				    unittest_path(unittest_nr + i,
+						  PDEV_OVERLAY),
+				    !after ? "enabled" : "disabled");
 	}
 
 	for (i = 1; i >= 0; i--) {
 		ovcs_id = ov_id[i];
-		if (of_overlay_remove(&ovcs_id)) {
-			unittest(0, "%s failed destroy @\"%s\"\n",
-					overlay_name_from_nr(overlay_nr + i),
-					unittest_path(unittest_nr + i,
-						PDEV_OVERLAY));
-			return;
-		}
+		KUNIT_ASSERT_FALSE_MSG(
+			test, of_overlay_remove(&ovcs_id),
+			"%s failed destroy @\"%s\"\n",
+			overlay_name_from_nr(overlay_nr + i),
+			unittest_path(unittest_nr + i, PDEV_OVERLAY));
 		of_unittest_untrack_overlay(ov_id[i]);
 	}
 
 	for (i = 0; i < 2; i++) {
 		/* unittest device must be again in before state */
-		if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
-				!= before) {
-			unittest(0, "%s with device @\"%s\" %s\n",
-					overlay_name_from_nr(overlay_nr + i),
-					unittest_path(unittest_nr + i,
-						PDEV_OVERLAY),
-					!before ? "enabled" : "disabled");
-			return;
-		}
+		KUNIT_ASSERT_EQ_MSG(test,
+				    of_unittest_device_exists(unittest_nr + i,
+							      PDEV_OVERLAY),
+				    before,
+				    "%s with device @\"%s\" %s\n",
+				    overlay_name_from_nr(overlay_nr + i),
+				    unittest_path(unittest_nr + i,
+						  PDEV_OVERLAY),
+				    !before ? "enabled" : "disabled");
 	}
-
-	unittest(1, "overlay test %d passed\n", 6);
 }
 
 /* test overlay application in sequence */
-static void __init of_unittest_overlay_8(void)
+static void of_unittest_overlay_8(struct kunit *test)
 {
 	int i, ov_id[2], ovcs_id;
 	int overlay_nr = 8, unittest_nr = 8;
@@ -1722,76 +1789,64 @@ static void __init of_unittest_overlay_8(void)
 
 	/* apply the overlays */
 	for (i = 0; i < 2; i++) {
-
 		overlay_name = overlay_name_from_nr(overlay_nr + i);
 
-		if (!overlay_data_apply(overlay_name, &ovcs_id)) {
-			unittest(0, "could not apply overlay \"%s\"\n",
-					overlay_name);
-			return;
-		}
+		KUNIT_ASSERT_TRUE_MSG(
+			test, overlay_data_apply(overlay_name, &ovcs_id),
+			"could not apply overlay \"%s\"\n", overlay_name);
 		ov_id[i] = ovcs_id;
 		of_unittest_track_overlay(ov_id[i]);
 	}
 
 	/* now try to remove first overlay (it should fail) */
 	ovcs_id = ov_id[0];
-	if (!of_overlay_remove(&ovcs_id)) {
-		unittest(0, "%s was destroyed @\"%s\"\n",
-				overlay_name_from_nr(overlay_nr + 0),
-				unittest_path(unittest_nr,
-					PDEV_OVERLAY));
-		return;
-	}
+	KUNIT_ASSERT_TRUE_MSG(
+		test, of_overlay_remove(&ovcs_id),
+		"%s was destroyed @\"%s\"\n",
+		overlay_name_from_nr(overlay_nr + 0),
+		unittest_path(unittest_nr, PDEV_OVERLAY));
 
 	/* removing them in order should work */
 	for (i = 1; i >= 0; i--) {
 		ovcs_id = ov_id[i];
-		if (of_overlay_remove(&ovcs_id)) {
-			unittest(0, "%s not destroyed @\"%s\"\n",
-					overlay_name_from_nr(overlay_nr + i),
-					unittest_path(unittest_nr,
-						PDEV_OVERLAY));
-			return;
-		}
+		KUNIT_ASSERT_FALSE_MSG(
+			test, of_overlay_remove(&ovcs_id),
+			"%s not destroyed @\"%s\"\n",
+			overlay_name_from_nr(overlay_nr + i),
+			unittest_path(unittest_nr, PDEV_OVERLAY));
 		of_unittest_untrack_overlay(ov_id[i]);
 	}
-
-	unittest(1, "overlay test %d passed\n", 8);
 }
 
 /* test insertion of a bus with parent devices */
-static void __init of_unittest_overlay_10(void)
+static void of_unittest_overlay_10(struct kunit *test)
 {
-	int ret;
 	char *child_path;
 
 	/* device should disable */
-	ret = of_unittest_apply_overlay_check(10, 10, 0, 1, PDEV_OVERLAY);
-	if (unittest(ret == 0,
-			"overlay test %d failed; overlay application\n", 10))
-		return;
+	KUNIT_ASSERT_EQ_MSG(
+		test,
+		of_unittest_apply_overlay_check(
+				test, 10, 10, 0, 1, PDEV_OVERLAY),
+		0,
+		"overlay test %d failed; overlay application\n", 10);
 
 	child_path = kasprintf(GFP_KERNEL, "%s/test-unittest101",
 			unittest_path(10, PDEV_OVERLAY));
-	if (unittest(child_path, "overlay test %d failed; kasprintf\n", 10))
-		return;
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, child_path);
 
-	ret = of_path_device_type_exists(child_path, PDEV_OVERLAY);
+	KUNIT_EXPECT_TRUE_MSG(
+		test, of_path_device_type_exists(child_path, PDEV_OVERLAY),
+		"overlay test %d failed; no child device\n", 10);
 	kfree(child_path);
-
-	unittest(ret, "overlay test %d failed; no child device\n", 10);
 }
 
 /* test insertion of a bus with parent devices (and revert) */
-static void __init of_unittest_overlay_11(void)
+static void of_unittest_overlay_11(struct kunit *test)
 {
-	int ret;
-
 	/* device should disable */
-	ret = of_unittest_apply_revert_overlay_check(11, 11, 0, 1,
-			PDEV_OVERLAY);
-	unittest(ret == 0, "overlay test %d failed; overlay apply\n", 11);
+	KUNIT_EXPECT_FALSE(test, of_unittest_apply_revert_overlay_check(
+		test, 11, 11, 0, 1, PDEV_OVERLAY));
 }
 
 #if IS_BUILTIN(CONFIG_I2C) && IS_ENABLED(CONFIG_OF_OVERLAY)
@@ -2013,25 +2068,18 @@ static struct i2c_driver unittest_i2c_mux_driver = {
 
 #endif
 
-static int of_unittest_overlay_i2c_init(void)
+static int of_unittest_overlay_i2c_init(struct kunit *test)
 {
-	int ret;
-
-	ret = i2c_add_driver(&unittest_i2c_dev_driver);
-	if (unittest(ret == 0,
-			"could not register unittest i2c device driver\n"))
-		return ret;
+	KUNIT_ASSERT_EQ_MSG(test, i2c_add_driver(&unittest_i2c_dev_driver), 0,
+			    "could not register unittest i2c device driver\n");
 
-	ret = platform_driver_register(&unittest_i2c_bus_driver);
-	if (unittest(ret == 0,
-			"could not register unittest i2c bus driver\n"))
-		return ret;
+	KUNIT_ASSERT_EQ_MSG(
+		test, platform_driver_register(&unittest_i2c_bus_driver), 0,
+		"could not register unittest i2c bus driver\n");
 
 #if IS_BUILTIN(CONFIG_I2C_MUX)
-	ret = i2c_add_driver(&unittest_i2c_mux_driver);
-	if (unittest(ret == 0,
-			"could not register unittest i2c mux driver\n"))
-		return ret;
+	KUNIT_ASSERT_EQ_MSG(test, i2c_add_driver(&unittest_i2c_mux_driver), 0,
+			    "could not register unittest i2c mux driver\n");
 #endif
 
 	return 0;
@@ -2046,101 +2094,85 @@ static void of_unittest_overlay_i2c_cleanup(void)
 	i2c_del_driver(&unittest_i2c_dev_driver);
 }
 
-static void __init of_unittest_overlay_i2c_12(void)
+static void of_unittest_overlay_i2c_12(struct kunit *test)
 {
 	/* device should enable */
-	if (of_unittest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY))
-		return;
-
-	unittest(1, "overlay test %d passed\n", 12);
+	of_unittest_apply_overlay_check(test, 12, 12, 0, 1, I2C_OVERLAY);
 }
 
 /* test deactivation of device */
-static void __init of_unittest_overlay_i2c_13(void)
+static void of_unittest_overlay_i2c_13(struct kunit *test)
 {
 	/* device should disable */
-	if (of_unittest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY))
-		return;
-
-	unittest(1, "overlay test %d passed\n", 13);
+	of_unittest_apply_overlay_check(test, 13, 13, 1, 0, I2C_OVERLAY);
 }
 
 /* just check for i2c mux existence */
-static void of_unittest_overlay_i2c_14(void)
+static void of_unittest_overlay_i2c_14(struct kunit *test)
 {
+	KUNIT_SUCCEED(test);
 }
 
-static void __init of_unittest_overlay_i2c_15(void)
+static void of_unittest_overlay_i2c_15(struct kunit *test)
 {
 	/* device should enable */
-	if (of_unittest_apply_overlay_check(15, 15, 0, 1, I2C_OVERLAY))
-		return;
-
-	unittest(1, "overlay test %d passed\n", 15);
+	of_unittest_apply_overlay_check(test, 15, 15, 0, 1, I2C_OVERLAY);
 }
 
 #else
 
-static inline void of_unittest_overlay_i2c_14(void) { }
-static inline void of_unittest_overlay_i2c_15(void) { }
+static inline void of_unittest_overlay_i2c_14(struct kunit *test) { }
+static inline void of_unittest_overlay_i2c_15(struct kunit *test) { }
 
 #endif
 
-static void __init of_unittest_overlay(void)
+static void of_unittest_overlay(struct kunit *test)
 {
 	struct device_node *bus_np = NULL;
 
-	if (platform_driver_register(&unittest_driver)) {
-		unittest(0, "could not register unittest driver\n");
-		goto out;
-	}
+	KUNIT_ASSERT_FALSE_MSG(test, platform_driver_register(&unittest_driver),
+			       "could not register unittest driver\n");
 
 	bus_np = of_find_node_by_path(bus_path);
-	if (bus_np == NULL) {
-		unittest(0, "could not find bus_path \"%s\"\n", bus_path);
-		goto out;
-	}
+	KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(
+		test, bus_np, "could not find bus_path \"%s\"\n", bus_path);
 
-	if (of_platform_default_populate(bus_np, NULL, NULL)) {
-		unittest(0, "could not populate bus @ \"%s\"\n", bus_path);
-		goto out;
-	}
-
-	if (!of_unittest_device_exists(100, PDEV_OVERLAY)) {
-		unittest(0, "could not find unittest0 @ \"%s\"\n",
-				unittest_path(100, PDEV_OVERLAY));
-		goto out;
-	}
+	KUNIT_ASSERT_FALSE_MSG(
+		test, of_platform_default_populate(bus_np, NULL, NULL),
+		"could not populate bus @ \"%s\"\n", bus_path);
 
-	if (of_unittest_device_exists(101, PDEV_OVERLAY)) {
-		unittest(0, "unittest1 @ \"%s\" should not exist\n",
-				unittest_path(101, PDEV_OVERLAY));
-		goto out;
-	}
+	KUNIT_ASSERT_TRUE_MSG(
+		test, of_unittest_device_exists(100, PDEV_OVERLAY),
+		"could not find unittest0 @ \"%s\"\n",
+		unittest_path(100, PDEV_OVERLAY));
 
-	unittest(1, "basic infrastructure of overlays passed");
+	KUNIT_ASSERT_FALSE_MSG(
+		test, of_unittest_device_exists(101, PDEV_OVERLAY),
+		"unittest1 @ \"%s\" should not exist\n",
+		unittest_path(101, PDEV_OVERLAY));
 
 	/* tests in sequence */
-	of_unittest_overlay_0();
-	of_unittest_overlay_1();
-	of_unittest_overlay_2();
-	of_unittest_overlay_3();
-	of_unittest_overlay_4();
-	of_unittest_overlay_5();
-	of_unittest_overlay_6();
-	of_unittest_overlay_8();
-
-	of_unittest_overlay_10();
-	of_unittest_overlay_11();
+	of_unittest_overlay_0(test);
+	of_unittest_overlay_1(test);
+	of_unittest_overlay_2(test);
+	of_unittest_overlay_3(test);
+	of_unittest_overlay_4(test);
+	of_unittest_overlay_5(test);
+	of_unittest_overlay_6(test);
+	of_unittest_overlay_8(test);
+
+	of_unittest_overlay_10(test);
+	of_unittest_overlay_11(test);
 
 #if IS_BUILTIN(CONFIG_I2C)
-	if (unittest(of_unittest_overlay_i2c_init() == 0, "i2c init failed\n"))
-		goto out;
+	KUNIT_ASSERT_EQ_MSG(test, of_unittest_overlay_i2c_init(test), 0,
+			    "i2c init failed\n");
+	goto out;
 
-	of_unittest_overlay_i2c_12();
-	of_unittest_overlay_i2c_13();
-	of_unittest_overlay_i2c_14();
-	of_unittest_overlay_i2c_15();
+	of_unittest_overlay_i2c_12(test);
+	of_unittest_overlay_i2c_13(test);
+	of_unittest_overlay_i2c_14(test);
+	of_unittest_overlay_i2c_15(test);
 
 	of_unittest_overlay_i2c_cleanup();
 #endif
@@ -2152,7 +2184,7 @@ static void __init of_unittest_overlay(void)
 }
 
 #else
-static inline void __init of_unittest_overlay(void) { }
+static inline void of_unittest_overlay(struct kunit *test) { }
 #endif
 
 #ifdef CONFIG_OF_OVERLAY
@@ -2313,7 +2345,7 @@ void __init unittest_unflatten_overlay_base(void)
  *
  * Return 0 on unexpected error.
  */
-static int __init overlay_data_apply(const char *overlay_name, int *overlay_id)
+static int overlay_data_apply(const char *overlay_name, int *overlay_id)
 {
 	struct overlay_info *info;
 	int found = 0;
@@ -2359,19 +2391,17 @@ static int __init overlay_data_apply(const char *overlay_name, int *overlay_id)
  * The first part of the function is _not_ normal overlay usage; it is
  * finishing splicing the base overlay device tree into the live tree.
  */
-static __init void of_unittest_overlay_high_level(void)
+static void of_unittest_overlay_high_level(struct kunit *test)
 {
 	struct device_node *last_sibling;
 	struct device_node *np;
 	struct device_node *of_symbols;
-	struct device_node *overlay_base_symbols;
+	struct device_node *overlay_base_symbols = 0;
 	struct device_node **pprev;
 	struct property *prop;
 
-	if (!overlay_base_root) {
-		unittest(0, "overlay_base_root not initialized\n");
-		return;
-	}
+	KUNIT_ASSERT_TRUE_MSG(test, overlay_base_root,
+			      "overlay_base_root not initialized\n");
 
 	/*
 	 * Could not fixup phandles in unittest_unflatten_overlay_base()
@@ -2418,11 +2448,9 @@ static __init void of_unittest_overlay_high_level(void)
 	for_each_child_of_node(overlay_base_root, np) {
 		struct device_node *base_child;
 		for_each_child_of_node(of_root, base_child) {
-			if (!strcmp(np->full_name, base_child->full_name)) {
-				unittest(0, "illegal node name in overlay_base %pOFn",
-					 np);
-				return;
-			}
+			KUNIT_ASSERT_STRNEQ_MSG(
+				test, np->full_name, base_child->full_name,
+				"illegal node name in overlay_base %pOFn", np);
 		}
 	}
 
@@ -2456,21 +2484,24 @@ static __init void of_unittest_overlay_high_level(void)
 
 			new_prop = __of_prop_dup(prop, GFP_KERNEL);
 			if (!new_prop) {
-				unittest(0, "__of_prop_dup() of '%s' from overlay_base node __symbols__",
-					 prop->name);
+				KUNIT_FAIL(test,
+					   "__of_prop_dup() of '%s' from overlay_base node __symbols__",
+					   prop->name);
 				goto err_unlock;
 			}
 			if (__of_add_property(of_symbols, new_prop)) {
 				/* "name" auto-generated by unflatten */
 				if (!strcmp(new_prop->name, "name"))
 					continue;
-				unittest(0, "duplicate property '%s' in overlay_base node __symbols__",
-					 prop->name);
+				KUNIT_FAIL(test,
+					   "duplicate property '%s' in overlay_base node __symbols__",
+					   prop->name);
 				goto err_unlock;
 			}
 			if (__of_add_property_sysfs(of_symbols, new_prop)) {
-				unittest(0, "unable to add property '%s' in overlay_base node __symbols__ to sysfs",
-					 prop->name);
+				KUNIT_FAIL(test,
+					   "unable to add property '%s' in overlay_base node __symbols__ to sysfs",
+					   prop->name);
 				goto err_unlock;
 			}
 		}
@@ -2481,20 +2512,24 @@ static __init void of_unittest_overlay_high_level(void)
 
 	/* now do the normal overlay usage test */
 
-	unittest(overlay_data_apply("overlay", NULL),
-		 "Adding overlay 'overlay' failed\n");
+	KUNIT_EXPECT_TRUE_MSG(test, overlay_data_apply("overlay", NULL),
+			      "Adding overlay 'overlay' failed\n");
 
-	unittest(overlay_data_apply("overlay_bad_add_dup_node", NULL),
-		 "Adding overlay 'overlay_bad_add_dup_node' failed\n");
+	KUNIT_EXPECT_TRUE_MSG(
+		test, overlay_data_apply("overlay_bad_add_dup_node", NULL),
+		"Adding overlay 'overlay_bad_add_dup_node' failed\n");
 
-	unittest(overlay_data_apply("overlay_bad_add_dup_prop", NULL),
-		 "Adding overlay 'overlay_bad_add_dup_prop' failed\n");
+	KUNIT_EXPECT_TRUE_MSG(
+		test, overlay_data_apply("overlay_bad_add_dup_prop", NULL),
+		"Adding overlay 'overlay_bad_add_dup_prop' failed\n");
 
-	unittest(overlay_data_apply("overlay_bad_phandle", NULL),
-		 "Adding overlay 'overlay_bad_phandle' failed\n");
+	KUNIT_EXPECT_TRUE_MSG(
+		test, overlay_data_apply("overlay_bad_phandle", NULL),
+		"Adding overlay 'overlay_bad_phandle' failed\n");
 
-	unittest(overlay_data_apply("overlay_bad_symbol", NULL),
-		 "Adding overlay 'overlay_bad_symbol' failed\n");
+	KUNIT_EXPECT_TRUE_MSG(
+		test, overlay_data_apply("overlay_bad_symbol", NULL),
+		"Adding overlay 'overlay_bad_symbol' failed\n");
 
 	return;
 
@@ -2504,57 +2539,52 @@ static __init void of_unittest_overlay_high_level(void)
 
 #else
 
-static inline __init void of_unittest_overlay_high_level(void) {}
+static inline void of_unittest_overlay_high_level(struct kunit *test) {}
 
 #endif
 
-static int __init of_unittest(void)
+static int of_test_init(struct kunit *test)
 {
-	struct device_node *np;
-	int res;
-
 	/* adding data for unittest */
-	res = unittest_data_add();
-	if (res)
-		return res;
+	KUNIT_ASSERT_EQ(test, 0, unittest_data_add());
+
 	if (!of_aliases)
 		of_aliases = of_find_node_by_path("/aliases");
 
-	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
-	if (!np) {
-		pr_info("No testcase data in device tree; not running tests\n");
-		return 0;
-	}
-	of_node_put(np);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, of_find_node_by_path(
+		"/testcase-data/phandle-tests/consumer-a"));
 
 	if (IS_ENABLED(CONFIG_UML))
 		unflatten_device_tree();
 
-	pr_info("start of unittest - you will see error messages\n");
-	of_unittest_check_tree_linkage();
-	of_unittest_check_phandles();
-	of_unittest_find_node_by_name();
-	of_unittest_dynamic();
-	of_unittest_parse_phandle_with_args();
-	of_unittest_parse_phandle_with_args_map();
-	of_unittest_printf();
-	of_unittest_property_string();
-	of_unittest_property_copy();
-	of_unittest_changeset();
-	of_unittest_parse_interrupts();
-	of_unittest_parse_interrupts_extended();
-	of_unittest_match_node();
-	of_unittest_platform_populate();
-	of_unittest_overlay();
+	return 0;
+}
 
+static struct kunit_case of_test_cases[] = {
+	KUNIT_CASE(of_unittest_check_tree_linkage),
+	KUNIT_CASE(of_unittest_check_phandles),
+	KUNIT_CASE(of_unittest_find_node_by_name),
+	KUNIT_CASE(of_unittest_dynamic),
+	KUNIT_CASE(of_unittest_parse_phandle_with_args),
+	KUNIT_CASE(of_unittest_parse_phandle_with_args_map),
+	KUNIT_CASE(of_unittest_printf),
+	KUNIT_CASE(of_unittest_property_string),
+	KUNIT_CASE(of_unittest_property_copy),
+	KUNIT_CASE(of_unittest_changeset),
+	KUNIT_CASE(of_unittest_parse_interrupts),
+	KUNIT_CASE(of_unittest_parse_interrupts_extended),
+	KUNIT_CASE(of_unittest_match_node),
+	KUNIT_CASE(of_unittest_platform_populate),
+	KUNIT_CASE(of_unittest_overlay),
 	/* Double check linkage after removing testcase data */
-	of_unittest_check_tree_linkage();
-
-	of_unittest_overlay_high_level();
-
-	pr_info("end of unittest - %i passed, %i failed\n",
-		unittest_results.passed, unittest_results.failed);
+	KUNIT_CASE(of_unittest_check_tree_linkage),
+	KUNIT_CASE(of_unittest_overlay_high_level),
+	{},
+};
 
-	return 0;
-}
-late_initcall(of_unittest);
+static struct kunit_module of_test_module = {
+	.name = "of-test",
+	.init = of_test_init,
+	.test_cases = of_test_cases,
+};
+module_test(of_test_module);
-- 
2.21.0.rc0.258.g878e2cd30e-goog