clk: tests: Make clk_register_clk_parent_data_device_driver() common

Rename clk_register_clk_parent_data_device_driver() to
kunit_of_platform_driver_dev() and have it return a struct device
pointer while accepting a match table. This will be useful to
find the device associated with an OF node for more tests than
only the clk_parent_data tests.

Signed-off-by: Jerome Brunet <[e-mail]>
[[e-mail]: Split out from next patch, carry SoB and
authorship, rename API, return device pointer]
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/clk_test.c

···
 };
 
 /**
- * struct clk_register_clk_parent_data_device_ctx - Context for clk_parent_data device tests
- * @dev: device of clk under test
- * @hw: clk_hw for clk under test
+ * struct platform_driver_dev_ctx - Context to stash platform device
+ * @dev: device under test
  * @pdrv: driver to attach to find @dev
  */
-struct clk_register_clk_parent_data_device_ctx {
+struct platform_driver_dev_ctx {
 	struct device *dev;
-	struct clk_hw hw;
 	struct platform_driver pdrv;
 };
 
-static inline struct clk_register_clk_parent_data_device_ctx *
-clk_register_clk_parent_data_driver_to_test_context(struct platform_device *pdev)
+static inline struct platform_driver_dev_ctx *
+pdev_to_platform_driver_dev_ctx(struct platform_device *pdev)
 {
 	return container_of(to_platform_driver(pdev->dev.driver),
-			    struct clk_register_clk_parent_data_device_ctx, pdrv);
+			    struct platform_driver_dev_ctx, pdrv);
 }
 
-static int clk_register_clk_parent_data_device_probe(struct platform_device *pdev)
+static int kunit_platform_driver_dev_probe(struct platform_device *pdev)
 {
-	struct clk_register_clk_parent_data_device_ctx *ctx;
+	struct platform_driver_dev_ctx *ctx;
 
-	ctx = clk_register_clk_parent_data_driver_to_test_context(pdev);
+	ctx = pdev_to_platform_driver_dev_ctx(pdev);
 	ctx->dev = &pdev->dev;
 
 	return 0;
 }
 
-static void clk_register_clk_parent_data_device_driver(struct kunit *test)
+static struct device *
+kunit_of_platform_driver_dev(struct kunit *test, const struct of_device_id *match_table)
 {
-	struct clk_register_clk_parent_data_device_ctx *ctx = test->priv;
-	static const struct of_device_id match_table[] = {
-		{ .compatible = "test,clk-parent-data" },
-		{ }
-	};
+	struct platform_driver_dev_ctx *ctx;
 
-	ctx->pdrv.probe = clk_register_clk_parent_data_device_probe;
+	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
+	ctx->pdrv.probe = kunit_platform_driver_dev_probe;
 	ctx->pdrv.driver.of_match_table = match_table;
 	ctx->pdrv.driver.name = __func__;
 	ctx->pdrv.driver.owner = THIS_MODULE;
 
 	KUNIT_ASSERT_EQ(test, 0, kunit_platform_driver_register(test, &ctx->pdrv));
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->dev);
+
+	return ctx->dev;
 }
 
 static const struct clk_register_clk_parent_data_test_case
···
  */
 static void clk_register_clk_parent_data_device_test(struct kunit *test)
 {
-	struct clk_register_clk_parent_data_device_ctx *ctx;
+	struct device *dev;
+	struct clk_hw *hw;
 	const struct clk_register_clk_parent_data_test_case *test_param;
 	struct clk_hw *parent_hw;
 	struct clk_init_data init = { };
 	struct clk *expected_parent, *actual_parent;
+	static const struct of_device_id match_table[] = {
+		{ .compatible = "test,clk-parent-data" },
+		{ }
+	};
 
-	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-	test->priv = ctx;
+	dev = kunit_of_platform_driver_dev(test, match_table);
 
-	clk_register_clk_parent_data_device_driver(test);
-
-	expected_parent = clk_get_kunit(test, ctx->dev, "50");
+	expected_parent = clk_get_kunit(test, dev, "50");
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, expected_parent);
+
+	hw = kunit_kzalloc(test, sizeof(*hw), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw);
 
 	test_param = test->param_value;
 	init.parent_data = &test_param->pdata;
 	init.num_parents = 1;
 	init.name = "parent_data_device_test_clk";
 	init.ops = &clk_dummy_single_parent_ops;
-	ctx->hw.init = &init;
-	KUNIT_ASSERT_EQ(test, 0, clk_hw_register_kunit(test, ctx->dev, &ctx->hw));
+	hw->init = &init;
+	KUNIT_ASSERT_EQ(test, 0, clk_hw_register_kunit(test, dev, hw));
 
-	parent_hw = clk_hw_get_parent(&ctx->hw);
+	parent_hw = clk_hw_get_parent(hw);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent_hw);
 
 	actual_parent = clk_hw_get_clk_kunit(test, parent_hw, __func__);
···
  */
 static void clk_register_clk_parent_data_device_hw_test(struct kunit *test)
 {
-	struct clk_register_clk_parent_data_device_ctx *ctx;
+	struct device *dev;
+	struct clk_hw *hw;
 	const struct clk_register_clk_parent_data_test_case *test_param;
 	struct clk_dummy_context *parent;
 	struct clk_hw *parent_hw;
 	struct clk_parent_data pdata = { };
 	struct clk_init_data init = { };
+	static const struct of_device_id match_table[] = {
+		{ .compatible = "test,clk-parent-data" },
+		{ }
+	};
 
-	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
-	test->priv = ctx;
-
-	clk_register_clk_parent_data_device_driver(test);
+	dev = kunit_of_platform_driver_dev(test, match_table);
 
 	parent = kunit_kzalloc(test, sizeof(*parent), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
···
 	parent_hw->init = CLK_HW_INIT_NO_PARENT("parent-clk",
 						&clk_dummy_rate_ops, 0);
 
-	KUNIT_ASSERT_EQ(test, 0, clk_hw_register_kunit(test, ctx->dev, parent_hw));
+	KUNIT_ASSERT_EQ(test, 0, clk_hw_register_kunit(test, dev, parent_hw));
+
+	hw = kunit_kzalloc(test, sizeof(*hw), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hw);
 
 	test_param = test->param_value;
 	memcpy(&pdata, &test_param->pdata, sizeof(pdata));
···
 	init.num_parents = 1;
 	init.ops = &clk_dummy_single_parent_ops;
 	init.name = "parent_data_device_hw_test_clk";
-	ctx->hw.init = &init;
-	KUNIT_ASSERT_EQ(test, 0, clk_hw_register_kunit(test, ctx->dev, &ctx->hw));
+	hw->init = &init;
+	KUNIT_ASSERT_EQ(test, 0, clk_hw_register_kunit(test, dev, hw));
 
-	KUNIT_EXPECT_PTR_EQ(test, parent_hw, clk_hw_get_parent(&ctx->hw));
+	KUNIT_EXPECT_PTR_EQ(test, parent_hw, clk_hw_get_parent(hw));
 }
 
 static struct kunit_case clk_register_clk_parent_data_device_test_cases[] = {