---- foo.dts ---------------------------------------------------------------
	/* FOO platform */
	/dts-v1/;
	/ {
		compatible = "corp,foo";

		/* shared resources */
		res: res {
		};

		/* On chip peripherals */
		ocp: ocp {
			/* peripherals that are always instantiated */
			peripheral1 { ... };
		};
	};
    ---- foo.dts ---------------------------------------------------------------

    ---- bar.dts - overlay target location by label ----------------------------
	/dts-v1/;
	/plugin/;
	&ocp {
		/* bar peripheral */
		bar {
			compatible = "corp,bar";
			... /* various properties and child nodes */
		};
	};
    ---- bar.dts ---------------------------------------------------------------

    ---- foo+bar.dts -----------------------------------------------------------
	/* FOO platform + bar peripheral */
	/ {
		compatible = "corp,foo";

		/* shared resources */
		res: res {
		};

		/* On chip peripherals */
		ocp: ocp {
			/* peripherals that are always instantiated */
			peripheral1 { ... };

			/* bar peripheral */
			bar {
				compatible = "corp,bar";
				... /* various properties and child nodes */
			};
		};
	};
    ---- foo+bar.dts -----------------------------------------------------------

---- bar.dts - Переопределить целевое местоположение с помощью явного указания пути --------------------------------
/dts-v1/;
/plugin/;
&{/ocp} {
	/* периферийные устройства для бара */
	bar {
		compatible = "corp,bar";
		... /* Различные атрибуты и подузлы */
	}
};
---- bar.dts ---------------------------------------------------------------

int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
			 int *ret_ovcs_id)
int of_overlay_remove(int *ovcs_id)

int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size, int *ret_ovcs_id)
		overlay_mem = of_fdt_unflatten_tree(new_fdt_align, NULL, &ovcs->overlay_root);
		ret = of_overlay_apply(ovcs);
			ret = of_resolve_phandles(ovcs->overlay_root);
			ret = init_overlay_changeset(ovcs);
			ret = overlay_notify(ovcs, OF_OVERLAY_PRE_APPLY);
			ret = build_changeset(ovcs);
			ret = __of_changeset_apply_entries(&ovcs->cset, &ret_revert);
			ret = __of_changeset_apply_notify(&ovcs->cset);
				ret_tmp = __of_changeset_entry_notify(ce, 0);
					ret = of_reconfig_notify(ce->action, &rd);
						rc = blocking_notifier_call_chain(&of_reconfig_chain, action, p)
							ret = nb->notifier_call(nb, val, v);
					ret = of_property_notify(ce->action, ce->np, ce->prop, ce->old_prop);
			ret_tmp = overlay_notify(ovcs, OF_OVERLAY_POST_APPLY);

gpiolib.c	4395 WARN_ON(of_reconfig_notifier_register(&gpio_of_notifier)); in gpiolib_dev_init()
spi.c	4344 WARN_ON(of_reconfig_notifier_register(&spi_of_notifier)); in spi_init()
platform.c	730 WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); in of_platform_register_reconfig_notifier()
i2c-core-base.c	1985 WARN_ON(of_reconfig_notifier_register(&i2c_of_notifier)); in i2c_init()

#ifdef CONFIG_OF_DYNAMIC
static int of_platform_notify(struct notifier_block *nb,
				unsigned long action, void *arg)
{
	struct of_reconfig_data *rd = arg;
	struct platform_device *pdev_parent, *pdev;
	bool children_left;
	int ret;

	switch (of_reconfig_get_state_change(action, rd)) {
	case OF_RECONFIG_CHANGE_ADD:
		/* verify that the parent is a bus */
		if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
			return NOTIFY_OK;	/* not for us */

		/* already populated? (driver using of_populate manually) */
		if (of_node_check_flag(rd->dn, OF_POPULATED))
			return NOTIFY_OK;

		/* pdev_parent may be NULL when no bus platform device */
		pdev_parent = of_find_device_by_node(rd->dn->parent);
		ret = of_platform_bus_create(rd->dn, of_default_bus_match_table,
					     NULL, pdev_parent ?
					     &pdev_parent->dev : NULL, true);
		platform_device_put(pdev_parent);

		if (ret) {
			pr_err("%s: failed to create for '%pOF'\n",
					__func__, rd->dn);
			/* of_platform_device_create tosses the error code */
			return notifier_from_errno(ret);
		}
		break;

	case OF_RECONFIG_CHANGE_REMOVE:

		/* already depopulated? */
		if (!of_node_check_flag(rd->dn, OF_POPULATED))
			return NOTIFY_OK;

		/* find our device by node */
		pdev = of_find_device_by_node(rd->dn);
		if (pdev == NULL)
			return NOTIFY_OK;	/* no? not meant for us */

		/* unregister takes one ref away */
		of_platform_device_destroy(&pdev->dev, &children_left);

		/* and put the reference of the find */
		platform_device_put(pdev);
		break;
	}

	return NOTIFY_OK;
}

static struct notifier_block platform_of_notifier = {
	.notifier_call = of_platform_notify,
};

static int of_spi_notify(struct notifier_block *nb, unsigned long action,
			 void *arg)
{
	struct of_reconfig_data *rd = arg;
	struct spi_controller *ctlr;
	struct spi_device *spi;

	switch (of_reconfig_get_state_change(action, arg)) {
	case OF_RECONFIG_CHANGE_ADD:
		ctlr = of_find_spi_controller_by_node(rd->dn->parent);
		if (ctlr == NULL)
			return NOTIFY_OK;	/* not for us */

		if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) {
			put_device(&ctlr->dev);
			return NOTIFY_OK;
		}

		spi = of_register_spi_device(ctlr, rd->dn);
		put_device(&ctlr->dev);

		if (IS_ERR(spi)) {
			pr_err("%s: failed to create for '%pOF'\n",
					__func__, rd->dn);
			of_node_clear_flag(rd->dn, OF_POPULATED);
			return notifier_from_errno(PTR_ERR(spi));
		}
		break;

	case OF_RECONFIG_CHANGE_REMOVE:
		/* already depopulated? */
		if (!of_node_check_flag(rd->dn, OF_POPULATED))
			return NOTIFY_OK;

		/* find our device by node */
		spi = of_find_spi_device_by_node(rd->dn);
		if (spi == NULL)
			return NOTIFY_OK;	/* no? not meant for us */

		/* unregister takes one ref away */
		spi_unregister_device(spi);

		/* and put the reference of the find */
		put_device(&spi->dev);
		break;
	}

	return NOTIFY_OK;
}

static struct notifier_block spi_of_notifier = {
	.notifier_call = of_spi_notify,
};

#if IS_ENABLED(CONFIG_OF_DYNAMIC)
static int of_i2c_notify(struct notifier_block *nb, unsigned long action,
			 void *arg)
{
	struct of_reconfig_data *rd = arg;
	struct i2c_adapter *adap;
	struct i2c_client *client;

	switch (of_reconfig_get_state_change(action, rd)) {
	case OF_RECONFIG_CHANGE_ADD:
		adap = of_find_i2c_adapter_by_node(rd->dn->parent);
		if (adap == NULL)
			return NOTIFY_OK;	/* not for us */

		if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) {
			put_device(&adap->dev);
			return NOTIFY_OK;
		}

		client = of_i2c_register_device(adap, rd->dn);
		if (IS_ERR(client)) {
			dev_err(&adap->dev, "failed to create client for '%pOF'\n",
				 rd->dn);
			put_device(&adap->dev);
			of_node_clear_flag(rd->dn, OF_POPULATED);
			return notifier_from_errno(PTR_ERR(client));
		}
		put_device(&adap->dev);
		break;
	case OF_RECONFIG_CHANGE_REMOVE:
		/* already depopulated? */
		if (!of_node_check_flag(rd->dn, OF_POPULATED))
			return NOTIFY_OK;

		/* find our device by node */
		client = of_find_i2c_device_by_node(rd->dn);
		if (client == NULL)
			return NOTIFY_OK;	/* no? not meant for us */

		/* unregister takes one ref away */
		i2c_unregister_device(client);

		/* and put the reference of the find */
		put_device(&client->dev);
		break;
	}

	return NOTIFY_OK;
}

struct notifier_block i2c_of_notifier = {
	.notifier_call = of_i2c_notify,
};