of: unitest: Add I2C overlay unit tests. (d5e75500) · Commits · EulixOS / Software / Kernel

Documentation/devicetree/bindings/unittest.txt

+58 −1

Original line number	Diff line number	Diff line
		* OF selftest platform device
		1) OF selftest platform device

		** selftest

		@@ -12,3 +12,60 @@ Example:
		compatible = "selftest";
		status = "okay";
		};

		2) OF selftest i2c adapter platform device

		** platform device unittest adapter

		Required properties:
		- compatible: must be selftest-i2c-bus

		Children nodes contain selftest i2c devices.

		Example:
		selftest-i2c-bus {
		compatible = "selftest-i2c-bus";
		status = "okay";
		};

		3) OF selftest i2c device

		** I2C selftest device

		Required properties:
		- compatible: must be selftest-i2c-dev

		All other properties are optional

		Example:
		selftest-i2c-dev {
		compatible = "selftest-i2c-dev";
		status = "okay";
		};

		4) OF selftest i2c mux device

		** I2C selftest mux

		Required properties:
		- compatible: must be selftest-i2c-mux

		Children nodes contain selftest i2c bus nodes per channel.

		Example:
		selftest-i2c-mux {
		compatible = "selftest-i2c-mux";
		status = "okay";
		#address-cells = <1>;
		#size-cells = <0>;
		channel-0 {
		reg = <0>;
		#address-cells = <1>;
		#size-cells = <0>;
		i2c-dev {
		reg = <8>;
		compatible = "selftest-i2c-dev";
		status = "okay";
		};
		};
		};

drivers/of/unittest-data/tests-overlay.dtsi

+94 −0

Original line number	Diff line number	Diff line
		@@ -68,6 +68,48 @@
		status = "disabled";
		reg = <8>;
		};

		i2c-test-bus {
		compatible = "selftest-i2c-bus";
		status = "okay";
		reg = <50>;

		#address-cells = <1>;
		#size-cells = <0>;

		test-selftest12 {
		reg = <8>;
		compatible = "selftest-i2c-dev";
		status = "disabled";
		};

		test-selftest13 {
		reg = <9>;
		compatible = "selftest-i2c-dev";
		status = "okay";
		};

		test-selftest14 {
		reg = <10>;
		compatible = "selftest-i2c-mux";
		status = "okay";

		#address-cells = <1>;
		#size-cells = <0>;

		i2c@0 {
		#address-cells = <1>;
		#size-cells = <0>;
		reg = <0>;

		test-mux-dev {
		reg = <32>;
		compatible = "selftest-i2c-dev";
		status = "okay";
		};
		};
		};
		};
		};
		};

		@@ -231,5 +273,57 @@
		};
		};
		};

		/* test enable using absolute target path (i2c) */
		overlay12 {
		fragment@0 {
		target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-selftest12";
		__overlay__ {
		status = "okay";
		};
		};
		};

		/* test disable using absolute target path (i2c) */
		overlay13 {
		fragment@0 {
		target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus/test-selftest13";
		__overlay__ {
		status = "disabled";
		};
		};
		};

		/* test mux overlay */
		overlay15 {
		fragment@0 {
		target-path = "/testcase-data/overlay-node/test-bus/i2c-test-bus";
		__overlay__ {
		#address-cells = <1>;
		#size-cells = <0>;
		test-selftest15 {
		reg = <11>;
		compatible = "selftest-i2c-mux";
		status = "okay";

		#address-cells = <1>;
		#size-cells = <0>;

		i2c@0 {
		#address-cells = <1>;
		#size-cells = <0>;
		reg = <0>;

		test-mux-dev {
		reg = <32>;
		compatible = "selftest-i2c-dev";
		status = "okay";
		};
		};
		};
		};
		};
		};

		};
		};

drivers/of/unittest.c

+462 −50

Original line number	Diff line number	Diff line
		@@ -20,6 +20,9 @@
		#include <linux/platform_device.h>
		#include <linux/of_platform.h>

		#include <linux/i2c.h>
		#include <linux/i2c-mux.h>

		#include "of_private.h"

		static struct selftest_results {
		@@ -991,17 +994,94 @@ static int of_path_platform_device_exists(const char *path)
		return pdev != NULL;
		}

		static const char *selftest_path(int nr)
		#if IS_ENABLED(CONFIG_I2C)

		/* get the i2c client device instantiated at the path */
		static struct i2c_client of_path_to_i2c_client(const char path)
		{
		struct device_node *np;
		struct i2c_client *client;

		np = of_find_node_by_path(path);
		if (np == NULL)
		return NULL;

		client = of_find_i2c_device_by_node(np);
		of_node_put(np);

		return client;
		}

		/* find out if a i2c client device exists at that path */
		static int of_path_i2c_client_exists(const char *path)
		{
		struct i2c_client *client;

		client = of_path_to_i2c_client(path);
		if (client)
		put_device(&client->dev);
		return client != NULL;
		}
		#else
		static int of_path_i2c_client_exists(const char *path)
		{
		return 0;
		}
		#endif

		enum overlay_type {
		PDEV_OVERLAY,
		I2C_OVERLAY
		};

		static int of_path_device_type_exists(const char *path,
		enum overlay_type ovtype)
		{
		switch (ovtype) {
		case PDEV_OVERLAY:
		return of_path_platform_device_exists(path);
		case I2C_OVERLAY:
		return of_path_i2c_client_exists(path);
		}
		return 0;
		}

		static const char *selftest_path(int nr, enum overlay_type ovtype)
		{
		const char *base;
		static char buf[256];

		snprintf(buf, sizeof(buf) - 1,
		"/testcase-data/overlay-node/test-bus/test-selftest%d", nr);
		switch (ovtype) {
		case PDEV_OVERLAY:
		base = "/testcase-data/overlay-node/test-bus";
		break;
		case I2C_OVERLAY:
		base = "/testcase-data/overlay-node/test-bus/i2c-test-bus";
		break;
		default:
		buf[0] = '\0';
		return buf;
		}
		snprintf(buf, sizeof(buf) - 1, "%s/test-selftest%d", base, nr);
		buf[sizeof(buf) - 1] = '\0';

		return buf;
		}

		static int of_selftest_device_exists(int selftest_nr, enum overlay_type ovtype)
		{
		const char *path;

		path = selftest_path(selftest_nr, ovtype);

		switch (ovtype) {
		case PDEV_OVERLAY:
		return of_path_platform_device_exists(path);
		case I2C_OVERLAY:
		return of_path_i2c_client_exists(path);
		}
		return 0;
		}

		static const char *overlay_path(int nr)
		{
		static char buf[256];
		@@ -1050,16 +1130,15 @@ static int of_selftest_apply_overlay(int selftest_nr, int overlay_nr,

		/* apply an overlay while checking before and after states */
		static int of_selftest_apply_overlay_check(int overlay_nr, int selftest_nr,
		int before, int after)
		int before, int after, enum overlay_type ovtype)
		{
		int ret;

		/* selftest device must not be in before state */
		if (of_path_platform_device_exists(selftest_path(selftest_nr))
		!= before) {
		if (of_selftest_device_exists(selftest_nr, ovtype) != before) {
		selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
		overlay_path(overlay_nr),
		selftest_path(selftest_nr),
		selftest_path(selftest_nr, ovtype),
		!before ? "enabled" : "disabled");
		return -EINVAL;
		}
		@@ -1071,11 +1150,10 @@ static int of_selftest_apply_overlay_check(int overlay_nr, int selftest_nr,
		}

		/* selftest device must be to set to after state */
		if (of_path_platform_device_exists(selftest_path(selftest_nr))
		!= after) {
		if (of_selftest_device_exists(selftest_nr, ovtype) != after) {
		selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
		overlay_path(overlay_nr),
		selftest_path(selftest_nr),
		selftest_path(selftest_nr, ovtype),
		!after ? "enabled" : "disabled");
		return -EINVAL;
		}
		@@ -1085,16 +1163,16 @@ static int of_selftest_apply_overlay_check(int overlay_nr, int selftest_nr,

		/* apply an overlay and then revert it while checking before, after states */
		static int of_selftest_apply_revert_overlay_check(int overlay_nr,
		int selftest_nr, int before, int after)
		int selftest_nr, int before, int after,
		enum overlay_type ovtype)
		{
		int ret, ov_id;

		/* selftest device must be in before state */
		if (of_path_platform_device_exists(selftest_path(selftest_nr))
		!= before) {
		if (of_selftest_device_exists(selftest_nr, ovtype) != before) {
		selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
		overlay_path(overlay_nr),
		selftest_path(selftest_nr),
		selftest_path(selftest_nr, ovtype),
		!before ? "enabled" : "disabled");
		return -EINVAL;
		}
		@@ -1107,11 +1185,10 @@ static int of_selftest_apply_revert_overlay_check(int overlay_nr,
		}

		/* selftest device must be in after state */
		if (of_path_platform_device_exists(selftest_path(selftest_nr))
		!= after) {
		if (of_selftest_device_exists(selftest_nr, ovtype) != after) {
		selftest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
		overlay_path(overlay_nr),
		selftest_path(selftest_nr),
		selftest_path(selftest_nr, ovtype),
		!after ? "enabled" : "disabled");
		return -EINVAL;
		}
		@@ -1120,16 +1197,15 @@ static int of_selftest_apply_revert_overlay_check(int overlay_nr,
		if (ret != 0) {
		selftest(0, "overlay @\"%s\" failed to be destroyed @\"%s\"\n",
		overlay_path(overlay_nr),
		selftest_path(selftest_nr));
		selftest_path(selftest_nr, ovtype));
		return ret;
		}

		/* selftest device must be again in before state */
		if (of_path_platform_device_exists(selftest_path(selftest_nr))
		!= before) {
		if (of_selftest_device_exists(selftest_nr, PDEV_OVERLAY) != before) {
		selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
		overlay_path(overlay_nr),
		selftest_path(selftest_nr),
		selftest_path(selftest_nr, ovtype),
		!before ? "enabled" : "disabled");
		return -EINVAL;
		}
		@@ -1143,7 +1219,7 @@ static void of_selftest_overlay_0(void)
		int ret;

		/* device should enable */
		ret = of_selftest_apply_overlay_check(0, 0, 0, 1);
		ret = of_selftest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY);
		if (ret != 0)
		return;

		@@ -1156,7 +1232,7 @@ static void of_selftest_overlay_1(void)
		int ret;

		/* device should disable */
		ret = of_selftest_apply_overlay_check(1, 1, 1, 0);
		ret = of_selftest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY);
		if (ret != 0)
		return;

		@@ -1169,7 +1245,7 @@ static void of_selftest_overlay_2(void)
		int ret;

		/* device should enable */
		ret = of_selftest_apply_overlay_check(2, 2, 0, 1);
		ret = of_selftest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY);
		if (ret != 0)
		return;

		@@ -1182,7 +1258,7 @@ static void of_selftest_overlay_3(void)
		int ret;

		/* device should disable */
		ret = of_selftest_apply_overlay_check(3, 3, 1, 0);
		ret = of_selftest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY);
		if (ret != 0)
		return;

		@@ -1195,7 +1271,7 @@ static void of_selftest_overlay_4(void)
		int ret;

		/* device should disable */
		ret = of_selftest_apply_overlay_check(4, 4, 0, 1);
		ret = of_selftest_apply_overlay_check(4, 4, 0, 1, PDEV_OVERLAY);
		if (ret != 0)
		return;

		@@ -1208,7 +1284,7 @@ static void of_selftest_overlay_5(void)
		int ret;

		/* device should disable */
		ret = of_selftest_apply_revert_overlay_check(5, 5, 0, 1);
		ret = of_selftest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY);
		if (ret != 0)
		return;

		@@ -1225,12 +1301,12 @@ static void of_selftest_overlay_6(void)

		/* selftest device must be in before state */
		for (i = 0; i < 2; i++) {
		if (of_path_platform_device_exists(
		selftest_path(selftest_nr + i))
		if (of_selftest_device_exists(selftest_nr + i, PDEV_OVERLAY)
		!= before) {
		selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
		overlay_path(overlay_nr + i),
		selftest_path(selftest_nr + i),
		selftest_path(selftest_nr + i,
		PDEV_OVERLAY),
		!before ? "enabled" : "disabled");
		return;
		}
		@@ -1257,12 +1333,12 @@ static void of_selftest_overlay_6(void)

		for (i = 0; i < 2; i++) {
		/* selftest device must be in after state */
		if (of_path_platform_device_exists(
		selftest_path(selftest_nr + i))
		if (of_selftest_device_exists(selftest_nr + i, PDEV_OVERLAY)
		!= after) {
		selftest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
		overlay_path(overlay_nr + i),
		selftest_path(selftest_nr + i),
		selftest_path(selftest_nr + i,
		PDEV_OVERLAY),
		!after ? "enabled" : "disabled");
		return;
		}
		@@ -1273,19 +1349,20 @@ static void of_selftest_overlay_6(void)
		if (ret != 0) {
		selftest(0, "overlay @\"%s\" failed destroy @\"%s\"\n",
		overlay_path(overlay_nr + i),
		selftest_path(selftest_nr + i));
		selftest_path(selftest_nr + i,
		PDEV_OVERLAY));
		return;
		}
		}

		for (i = 0; i < 2; i++) {
		/* selftest device must be again in before state */
		if (of_path_platform_device_exists(
		selftest_path(selftest_nr + i))
		if (of_selftest_device_exists(selftest_nr + i, PDEV_OVERLAY)
		!= before) {
		selftest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
		overlay_path(overlay_nr + i),
		selftest_path(selftest_nr + i),
		selftest_path(selftest_nr + i,
		PDEV_OVERLAY),
		!before ? "enabled" : "disabled");
		return;
		}
		@@ -1327,7 +1404,8 @@ static void of_selftest_overlay_8(void)
		if (ret == 0) {
		selftest(0, "overlay @\"%s\" was destroyed @\"%s\"\n",
		overlay_path(overlay_nr + 0),
		selftest_path(selftest_nr));
		selftest_path(selftest_nr,
		PDEV_OVERLAY));
		return;
		}

		@@ -1337,7 +1415,8 @@ static void of_selftest_overlay_8(void)
		if (ret != 0) {
		selftest(0, "overlay @\"%s\" not destroyed @\"%s\"\n",
		overlay_path(overlay_nr + i),
		selftest_path(selftest_nr));
		selftest_path(selftest_nr,
		PDEV_OVERLAY));
		return;
		}
		}
		@@ -1352,16 +1431,17 @@ static void of_selftest_overlay_10(void)
		char *child_path;

		/* device should disable */
		ret = of_selftest_apply_overlay_check(10, 10, 0, 1);
		if (selftest(ret == 0, "overlay test %d failed; overlay application\n", 10))
		ret = of_selftest_apply_overlay_check(10, 10, 0, 1, PDEV_OVERLAY);
		if (selftest(ret == 0,
		"overlay test %d failed; overlay application\n", 10))
		return;

		child_path = kasprintf(GFP_KERNEL, "%s/test-selftest101",
		selftest_path(10));
		selftest_path(10, PDEV_OVERLAY));
		if (selftest(child_path, "overlay test %d failed; kasprintf\n", 10))
		return;

		ret = of_path_platform_device_exists(child_path);
		ret = of_path_device_type_exists(child_path, PDEV_OVERLAY);
		kfree(child_path);
		if (selftest(ret, "overlay test %d failed; no child device\n", 10))
		return;
		@@ -1373,11 +1453,331 @@ static void of_selftest_overlay_11(void)
		int ret;

		/* device should disable */
		ret = of_selftest_apply_revert_overlay_check(11, 11, 0, 1);
		if (selftest(ret == 0, "overlay test %d failed; overlay application\n", 11))
		ret = of_selftest_apply_revert_overlay_check(11, 11, 0, 1,
		PDEV_OVERLAY);
		if (selftest(ret == 0,
		"overlay test %d failed; overlay application\n", 11))
		return;
		}

		#if IS_ENABLED(CONFIG_I2C) && IS_ENABLED(CONFIG_OF_OVERLAY)

		struct selftest_i2c_bus_data {
		struct platform_device *pdev;
		struct i2c_adapter adap;
		};

		static int selftest_i2c_master_xfer(struct i2c_adapter *adap,
		struct i2c_msg *msgs, int num)
		{
		struct selftest_i2c_bus_data *std = i2c_get_adapdata(adap);

		(void)std;

		return num;
		}

		static u32 selftest_i2c_functionality(struct i2c_adapter *adap)
		{
		return I2C_FUNC_I2C \| I2C_FUNC_SMBUS_EMUL;
		}

		static const struct i2c_algorithm selftest_i2c_algo = {
		.master_xfer = selftest_i2c_master_xfer,
		.functionality = selftest_i2c_functionality,
		};

		static int selftest_i2c_bus_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct device_node *np = dev->of_node;
		struct selftest_i2c_bus_data *std;
		struct i2c_adapter *adap;
		int ret;

		if (np == NULL) {
		dev_err(dev, "No OF data for device\n");
		return -EINVAL;

		}

		dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);

		std = devm_kzalloc(dev, sizeof(*std), GFP_KERNEL);
		if (!std) {
		dev_err(dev, "Failed to allocate selftest i2c data\n");
		return -ENOMEM;
		}

		/* link them together */
		std->pdev = pdev;
		platform_set_drvdata(pdev, std);

		adap = &std->adap;
		i2c_set_adapdata(adap, std);
		adap->nr = -1;
		strlcpy(adap->name, pdev->name, sizeof(adap->name));
		adap->class = I2C_CLASS_DEPRECATED;
		adap->algo = &selftest_i2c_algo;
		adap->dev.parent = dev;
		adap->dev.of_node = dev->of_node;
		adap->timeout = 5 * HZ;
		adap->retries = 3;

		ret = i2c_add_numbered_adapter(adap);
		if (ret != 0) {
		dev_err(dev, "Failed to add I2C adapter\n");
		return ret;
		}

		return 0;
		}

		static int selftest_i2c_bus_remove(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct device_node *np = dev->of_node;
		struct selftest_i2c_bus_data *std = platform_get_drvdata(pdev);

		dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
		i2c_del_adapter(&std->adap);

		return 0;
		}

		static struct of_device_id selftest_i2c_bus_match[] = {
		{ .compatible = "selftest-i2c-bus", },
		{},
		};

		static struct platform_driver selftest_i2c_bus_driver = {
		.probe = selftest_i2c_bus_probe,
		.remove = selftest_i2c_bus_remove,
		.driver = {
		.name = "selftest-i2c-bus",
		.of_match_table = of_match_ptr(selftest_i2c_bus_match),
		},
		};

		static int selftest_i2c_dev_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct device *dev = &client->dev;
		struct device_node *np = client->dev.of_node;

		if (!np) {
		dev_err(dev, "No OF node\n");
		return -EINVAL;
		}

		dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);

		return 0;
		};

		static int selftest_i2c_dev_remove(struct i2c_client *client)
		{
		struct device *dev = &client->dev;
		struct device_node *np = client->dev.of_node;

		dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
		return 0;
		}

		static const struct i2c_device_id selftest_i2c_dev_id[] = {
		{ .name = "selftest-i2c-dev" },
		{ }
		};

		static struct i2c_driver selftest_i2c_dev_driver = {
		.driver = {
		.name = "selftest-i2c-dev",
		.owner = THIS_MODULE,
		},
		.probe = selftest_i2c_dev_probe,
		.remove = selftest_i2c_dev_remove,
		.id_table = selftest_i2c_dev_id,
		};

		#if IS_ENABLED(CONFIG_I2C_MUX)

		struct selftest_i2c_mux_data {
		int nchans;
		struct i2c_adapter *adap[];
		};

		static int selftest_i2c_mux_select_chan(struct i2c_adapter *adap,
		void *client, u32 chan)
		{
		return 0;
		}

		static int selftest_i2c_mux_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		int ret, i, nchans, size;
		struct device *dev = &client->dev;
		struct i2c_adapter *adap = to_i2c_adapter(dev->parent);
		struct device_node np = client->dev.of_node, child;
		struct selftest_i2c_mux_data *stm;
		u32 reg, max_reg;

		dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);

		if (!np) {
		dev_err(dev, "No OF node\n");
		return -EINVAL;
		}

		max_reg = (u32)-1;
		for_each_child_of_node(np, child) {
		ret = of_property_read_u32(child, "reg", &reg);
		if (ret)
		continue;
		if (max_reg == (u32)-1 \|\| reg > max_reg)
		max_reg = reg;
		}
		nchans = max_reg == (u32)-1 ? 0 : max_reg + 1;
		if (nchans == 0) {
		dev_err(dev, "No channels\n");
		return -EINVAL;
		}

		size = offsetof(struct selftest_i2c_mux_data, adap[nchans]);
		stm = devm_kzalloc(dev, size, GFP_KERNEL);
		if (!stm) {
		dev_err(dev, "Out of memory\n");
		return -ENOMEM;
		}
		stm->nchans = nchans;
		for (i = 0; i < nchans; i++) {
		stm->adap[i] = i2c_add_mux_adapter(adap, dev, client,
		0, i, 0, selftest_i2c_mux_select_chan, NULL);
		if (!stm->adap[i]) {
		dev_err(dev, "Failed to register mux #%d\n", i);
		for (i--; i >= 0; i--)
		i2c_del_mux_adapter(stm->adap[i]);
		return -ENODEV;
		}
		}

		i2c_set_clientdata(client, stm);

		return 0;
		};

		static int selftest_i2c_mux_remove(struct i2c_client *client)
		{
		struct device *dev = &client->dev;
		struct device_node *np = client->dev.of_node;
		struct selftest_i2c_mux_data *stm = i2c_get_clientdata(client);
		int i;

		dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
		for (i = stm->nchans - 1; i >= 0; i--)
		i2c_del_mux_adapter(stm->adap[i]);
		return 0;
		}

		static const struct i2c_device_id selftest_i2c_mux_id[] = {
		{ .name = "selftest-i2c-mux" },
		{ }
		};

		static struct i2c_driver selftest_i2c_mux_driver = {
		.driver = {
		.name = "selftest-i2c-mux",
		.owner = THIS_MODULE,
		},
		.probe = selftest_i2c_mux_probe,
		.remove = selftest_i2c_mux_remove,
		.id_table = selftest_i2c_mux_id,
		};

		#endif

		static int of_selftest_overlay_i2c_init(void)
		{
		int ret;

		ret = i2c_add_driver(&selftest_i2c_dev_driver);
		if (selftest(ret == 0,
		"could not register selftest i2c device driver\n"))
		return ret;

		ret = platform_driver_register(&selftest_i2c_bus_driver);
		if (selftest(ret == 0,
		"could not register selftest i2c bus driver\n"))
		return ret;

		#if IS_ENABLED(CONFIG_I2C_MUX)
		ret = i2c_add_driver(&selftest_i2c_mux_driver);
		if (selftest(ret == 0,
		"could not register selftest i2c mux driver\n"))
		return ret;
		#endif

		return 0;
		}

		static void of_selftest_overlay_i2c_cleanup(void)
		{
		#if IS_ENABLED(CONFIG_I2C_MUX)
		i2c_del_driver(&selftest_i2c_mux_driver);
		#endif
		platform_driver_unregister(&selftest_i2c_bus_driver);
		i2c_del_driver(&selftest_i2c_dev_driver);
		}

		static void of_selftest_overlay_i2c_12(void)
		{
		int ret;

		/* device should enable */
		ret = of_selftest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY);
		if (ret != 0)
		return;

		selftest(1, "overlay test %d passed\n", 12);
		}

		/* test deactivation of device */
		static void of_selftest_overlay_i2c_13(void)
		{
		int ret;

		/* device should disable */
		ret = of_selftest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY);
		if (ret != 0)
		return;

		selftest(1, "overlay test %d passed\n", 13);
		}

		/* just check for i2c mux existence */
		static void of_selftest_overlay_i2c_14(void)
		{
		}

		static void of_selftest_overlay_i2c_15(void)
		{
		int ret;

		/* device should enable */
		ret = of_selftest_apply_overlay_check(16, 15, 0, 1, I2C_OVERLAY);
		if (ret != 0)
		return;

		selftest(1, "overlay test %d passed\n", 15);
		}

		#else

		static inline void of_selftest_overlay_i2c_14(void) { }
		static inline void of_selftest_overlay_i2c_15(void) { }

		#endif

		static void __init of_selftest_overlay(void)
		{
		struct device_node *bus_np = NULL;
		@@ -1402,15 +1802,15 @@ static void __init of_selftest_overlay(void)
		goto out;
		}

		if (!of_path_platform_device_exists(selftest_path(100))) {
		if (!of_selftest_device_exists(100, PDEV_OVERLAY)) {
		selftest(0, "could not find selftest0 @ \"%s\"\n",
		selftest_path(100));
		selftest_path(100, PDEV_OVERLAY));
		goto out;
		}

		if (of_path_platform_device_exists(selftest_path(101))) {
		if (of_selftest_device_exists(101, PDEV_OVERLAY)) {
		selftest(0, "selftest1 @ \"%s\" should not exist\n",
		selftest_path(101));
		selftest_path(101, PDEV_OVERLAY));
		goto out;
		}

		@@ -1429,6 +1829,18 @@ static void __init of_selftest_overlay(void)
		of_selftest_overlay_10();
		of_selftest_overlay_11();

		#if IS_ENABLED(CONFIG_I2C)
		if (selftest(of_selftest_overlay_i2c_init() == 0, "i2c init failed\n"))
		goto out;

		of_selftest_overlay_i2c_12();
		of_selftest_overlay_i2c_13();
		of_selftest_overlay_i2c_14();
		of_selftest_overlay_i2c_15();

		of_selftest_overlay_i2c_cleanup();
		#endif

		out:
		of_node_put(bus_np);
		}