test/dm/bus.c - platform/external/u-boot - Gitiles

 /*
  * Copyright (c) 2014 Google, Inc
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <dm.h>
 #include <dm/device-internal.h>
 #include <dm/root.h>
 #include <dm/test.h>
 #include <dm/uclass-internal.h>
 #include <dm/ut.h>
 #include <dm/util.h>

 DECLARE_GLOBAL_DATA_PTR;

 struct dm_test_parent_platdata {
 	int count;
 	int bind_flag;
 	int uclass_bind_flag;
 };

 enum {
 	FLAG_CHILD_PROBED	= 10,
 	FLAG_CHILD_REMOVED	= -7,
 };

 static struct dm_test_state *test_state;

 static int testbus_drv_probe(struct udevice *dev)
 {
 	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
 }

 static int testbus_child_post_bind(struct udevice *dev)
 {
 	struct dm_test_parent_platdata *plat;

 	plat = dev_get_parent_platdata(dev);
 	plat->bind_flag = 1;
 	plat->uclass_bind_flag = 2;

 	return 0;
 }

 static int testbus_child_pre_probe(struct udevice *dev)
 {
 	struct dm_test_parent_data *parent_data = dev_get_parentdata(dev);

 	parent_data->flag += FLAG_CHILD_PROBED;

 	return 0;
 }

 static int testbus_child_pre_probe_uclass(struct udevice *dev)
 {
 	struct dm_test_priv *priv = dev_get_priv(dev);

 	priv->uclass_flag++;

 	return 0;
 }

 static int testbus_child_post_remove(struct udevice *dev)
 {
 	struct dm_test_parent_data *parent_data = dev_get_parentdata(dev);
 	struct dm_test_state *dms = test_state;

 	parent_data->flag += FLAG_CHILD_REMOVED;
 	if (dms)
 		dms->removed = dev;

 	return 0;
 }

 static const struct udevice_id testbus_ids[] = {
 	{
 		.compatible = "denx,u-boot-test-bus",
 		.data = DM_TEST_TYPE_FIRST },
 	{ }
 };

 U_BOOT_DRIVER(testbus_drv) = {
 	.name	= "testbus_drv",
 	.of_match	= testbus_ids,
 	.id	= UCLASS_TEST_BUS,
 	.probe	= testbus_drv_probe,
 	.child_post_bind = testbus_child_post_bind,
 	.priv_auto_alloc_size = sizeof(struct dm_test_priv),
 	.platdata_auto_alloc_size = sizeof(struct dm_test_pdata),
 	.per_child_auto_alloc_size = sizeof(struct dm_test_parent_data),
 	.per_child_platdata_auto_alloc_size =
 			sizeof(struct dm_test_parent_platdata),
 	.child_pre_probe = testbus_child_pre_probe,
 	.child_post_remove = testbus_child_post_remove,
 };

 UCLASS_DRIVER(testbus) = {
 	.name		= "testbus",
 	.id		= UCLASS_TEST_BUS,
 	.flags		= DM_UC_FLAG_SEQ_ALIAS,
 	.child_pre_probe = testbus_child_pre_probe_uclass,
 };

 /* Test that we can probe for children */
 static int dm_test_bus_children(struct dm_test_state *dms)
 {
 	int num_devices = 6;
 	struct udevice *bus;
 	struct uclass *uc;

 	ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));
 	ut_asserteq(num_devices, list_count_items(&uc->dev_head));

 	/* Probe the bus, which should yield 3 more devices */
 	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
 	num_devices += 3;

 	ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));
 	ut_asserteq(num_devices, list_count_items(&uc->dev_head));

 	ut_assert(!dm_check_devices(dms, num_devices));

 	return 0;
 }
 DM_TEST(dm_test_bus_children, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /* Test our functions for accessing children */
 static int dm_test_bus_children_funcs(struct dm_test_state *dms)
 {
 	const void *blob = gd->fdt_blob;
 	struct udevice *bus, *dev;
 	int node;

 	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));

 	/* device_get_child() */
 	ut_assertok(device_get_child(bus, 0, &dev));
 	ut_asserteq(-ENODEV, device_get_child(bus, 4, &dev));
 	ut_assertok(device_get_child_by_seq(bus, 5, &dev));
 	ut_assert(dev->flags & DM_FLAG_ACTIVATED);
 	ut_asserteq_str("c-test@5", dev->name);

 	/* Device with sequence number 0 should be accessible */
 	ut_asserteq(-ENODEV, device_find_child_by_seq(bus, -1, true, &dev));
 	ut_assertok(device_find_child_by_seq(bus, 0, true, &dev));
 	ut_assert(!(dev->flags & DM_FLAG_ACTIVATED));
 	ut_asserteq(-ENODEV, device_find_child_by_seq(bus, 0, false, &dev));
 	ut_assertok(device_get_child_by_seq(bus, 0, &dev));
 	ut_assert(dev->flags & DM_FLAG_ACTIVATED);

 	/* There is no device with sequence number 2 */
 	ut_asserteq(-ENODEV, device_find_child_by_seq(bus, 2, false, &dev));
 	ut_asserteq(-ENODEV, device_find_child_by_seq(bus, 2, true, &dev));
 	ut_asserteq(-ENODEV, device_get_child_by_seq(bus, 2, &dev));

 	/* Looking for something that is not a child */
 	node = fdt_path_offset(blob, "/junk");
 	ut_asserteq(-ENODEV, device_find_child_by_of_offset(bus, node, &dev));
 	node = fdt_path_offset(blob, "/d-test");
 	ut_asserteq(-ENODEV, device_find_child_by_of_offset(bus, node, &dev));

 	/* Find a valid child */
 	node = fdt_path_offset(blob, "/some-bus/c-test@1");
 	ut_assertok(device_find_child_by_of_offset(bus, node, &dev));
 	ut_assert(!(dev->flags & DM_FLAG_ACTIVATED));
 	ut_assertok(device_get_child_by_of_offset(bus, node, &dev));
 	ut_assert(dev->flags & DM_FLAG_ACTIVATED);

 	return 0;
 }
 DM_TEST(dm_test_bus_children_funcs, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /* Test that we can iterate through children */
 static int dm_test_bus_children_iterators(struct dm_test_state *dms)
 {
 	struct udevice *bus, *dev, *child;

 	/* Walk through the children one by one */
 	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
 	ut_assertok(device_find_first_child(bus, &dev));
 	ut_asserteq_str("c-test@5", dev->name);
 	ut_assertok(device_find_next_child(&dev));
 	ut_asserteq_str("c-test@0", dev->name);
 	ut_assertok(device_find_next_child(&dev));
 	ut_asserteq_str("c-test@1", dev->name);
 	ut_assertok(device_find_next_child(&dev));
 	ut_asserteq_ptr(dev, NULL);

 	/* Move to the next child without using device_find_first_child() */
 	ut_assertok(device_find_child_by_seq(bus, 5, true, &dev));
 	ut_asserteq_str("c-test@5", dev->name);
 	ut_assertok(device_find_next_child(&dev));
 	ut_asserteq_str("c-test@0", dev->name);

 	/* Try a device with no children */
 	ut_assertok(device_find_first_child(dev, &child));
 	ut_asserteq_ptr(child, NULL);

 	return 0;
 }
 DM_TEST(dm_test_bus_children_iterators,
 	DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /* Test that the bus can store data about each child */
 static int test_bus_parent_data(struct dm_test_state *dms)
 {
 	struct dm_test_parent_data *parent_data;
 	struct udevice *bus, *dev;
 	struct uclass *uc;
 	int value;

 	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));

 	/* Check that parent data is allocated */
 	ut_assertok(device_find_child_by_seq(bus, 0, true, &dev));
 	ut_asserteq_ptr(NULL, dev_get_parentdata(dev));
 	ut_assertok(device_get_child_by_seq(bus, 0, &dev));
 	parent_data = dev_get_parentdata(dev);
 	ut_assert(NULL != parent_data);

 	/* Check that it starts at 0 and goes away when device is removed */
 	parent_data->sum += 5;
 	ut_asserteq(5, parent_data->sum);
 	device_remove(dev);
 	ut_asserteq_ptr(NULL, dev_get_parentdata(dev));

 	/* Check that we can do this twice */
 	ut_assertok(device_get_child_by_seq(bus, 0, &dev));
 	parent_data = dev_get_parentdata(dev);
 	ut_assert(NULL != parent_data);
 	parent_data->sum += 5;
 	ut_asserteq(5, parent_data->sum);

 	/* Add parent data to all children */
 	ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));
 	value = 5;
 	uclass_foreach_dev(dev, uc) {
 		/* Ignore these if they are not on this bus */
 		if (dev->parent != bus) {
 			ut_asserteq_ptr(NULL, dev_get_parentdata(dev));
 			continue;
 		}
 		ut_assertok(device_probe(dev));
 		parent_data = dev_get_parentdata(dev);

 		parent_data->sum = value;
 		value += 5;
 	}

 	/* Check it is still there */
 	value = 5;
 	uclass_foreach_dev(dev, uc) {
 		/* Ignore these if they are not on this bus */
 		if (dev->parent != bus)
 			continue;
 		parent_data = dev_get_parentdata(dev);

 		ut_asserteq(value, parent_data->sum);
 		value += 5;
 	}

 	return 0;
 }
 /* Test that the bus can store data about each child */
 static int dm_test_bus_parent_data(struct dm_test_state *dms)
 {
 	return test_bus_parent_data(dms);
 }
 DM_TEST(dm_test_bus_parent_data, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /* As above but the size is controlled by the uclass */
 static int dm_test_bus_parent_data_uclass(struct dm_test_state *dms)
 {
 	struct driver *drv;
 	struct udevice *bus;
 	int size;
 	int ret;

 	/* Set the driver size to 0 so that the uclass size is used */
 	ut_assertok(uclass_find_device(UCLASS_TEST_BUS, 0, &bus));
 	drv = (struct driver *)bus->driver;
 	size = drv->per_child_auto_alloc_size;
 	bus->uclass->uc_drv->per_child_auto_alloc_size = size;
 	drv->per_child_auto_alloc_size = 0;
 	ret = test_bus_parent_data(dms);
 	if (ret)
 		return ret;
 	bus->uclass->uc_drv->per_child_auto_alloc_size = 0;
 	drv->per_child_auto_alloc_size = size;

 	return 0;
 }
 DM_TEST(dm_test_bus_parent_data_uclass,
 	DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /* Test that the bus ops are called when a child is probed/removed */
 static int dm_test_bus_parent_ops(struct dm_test_state *dms)
 {
 	struct dm_test_parent_data *parent_data;
 	struct udevice *bus, *dev;
 	struct uclass *uc;

 	test_state = dms;
 	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
 	ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));

 	uclass_foreach_dev(dev, uc) {
 		/* Ignore these if they are not on this bus */
 		if (dev->parent != bus)
 			continue;
 		ut_asserteq_ptr(NULL, dev_get_parentdata(dev));

 		ut_assertok(device_probe(dev));
 		parent_data = dev_get_parentdata(dev);
 		ut_asserteq(FLAG_CHILD_PROBED, parent_data->flag);
 	}

 	uclass_foreach_dev(dev, uc) {
 		/* Ignore these if they are not on this bus */
 		if (dev->parent != bus)
 			continue;
 		parent_data = dev_get_parentdata(dev);
 		ut_asserteq(FLAG_CHILD_PROBED, parent_data->flag);
 		ut_assertok(device_remove(dev));
 		ut_asserteq_ptr(NULL, dev_get_parentdata(dev));
 		ut_asserteq_ptr(dms->removed, dev);
 	}
 	test_state = NULL;

 	return 0;
 }
 DM_TEST(dm_test_bus_parent_ops, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 static int test_bus_parent_platdata(struct dm_test_state *dms)
 {
 	struct dm_test_parent_platdata *plat;
 	struct udevice *bus, *dev;
 	int child_count;

 	/* Check that the bus has no children */
 	ut_assertok(uclass_find_device(UCLASS_TEST_BUS, 0, &bus));
 	device_find_first_child(bus, &dev);
 	ut_asserteq_ptr(NULL, dev);

 	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));

 	for (device_find_first_child(bus, &dev), child_count = 0;
 	     dev;
 	     device_find_next_child(&dev)) {
 		/* Check that platform data is allocated */
 		plat = dev_get_parent_platdata(dev);
 		ut_assert(plat != NULL);

 		/*
 		 * Check that it is not affected by the device being
 		 * probed/removed
 		 */
 		plat->count++;
 		ut_asserteq(1, plat->count);
 		device_probe(dev);
 		device_remove(dev);

 		ut_asserteq_ptr(plat, dev_get_parent_platdata(dev));
 		ut_asserteq(1, plat->count);
 		ut_assertok(device_probe(dev));
 		child_count++;
 	}
 	ut_asserteq(3, child_count);

 	/* Removing the bus should also have no effect (it is still bound) */
 	device_remove(bus);
 	for (device_find_first_child(bus, &dev), child_count = 0;
 	     dev;
 	     device_find_next_child(&dev)) {
 		/* Check that platform data is allocated */
 		plat = dev_get_parent_platdata(dev);
 		ut_assert(plat != NULL);
 		ut_asserteq(1, plat->count);
 		child_count++;
 	}
 	ut_asserteq(3, child_count);

 	/* Unbind all the children */
 	do {
 		device_find_first_child(bus, &dev);
 		if (dev)
 			device_unbind(dev);
 	} while (dev);

 	/* Now the child platdata should be removed and re-added */
 	device_probe(bus);
 	for (device_find_first_child(bus, &dev), child_count = 0;
 	     dev;
 	     device_find_next_child(&dev)) {
 		/* Check that platform data is allocated */
 		plat = dev_get_parent_platdata(dev);
 		ut_assert(plat != NULL);
 		ut_asserteq(0, plat->count);
 		child_count++;
 	}
 	ut_asserteq(3, child_count);

 	return 0;
 }

 /* Test that the bus can store platform data about each child */
 static int dm_test_bus_parent_platdata(struct dm_test_state *dms)
 {
 	return test_bus_parent_platdata(dms);
 }
 DM_TEST(dm_test_bus_parent_platdata, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /* As above but the size is controlled by the uclass */
 static int dm_test_bus_parent_platdata_uclass(struct dm_test_state *dms)
 {
 	struct udevice *bus;
 	struct driver *drv;
 	int size;
 	int ret;

 	/* Set the driver size to 0 so that the uclass size is used */
 	ut_assertok(uclass_find_device(UCLASS_TEST_BUS, 0, &bus));
 	drv = (struct driver *)bus->driver;
 	size = drv->per_child_platdata_auto_alloc_size;
 	bus->uclass->uc_drv->per_child_platdata_auto_alloc_size = size;
 	drv->per_child_platdata_auto_alloc_size = 0;
 	ret = test_bus_parent_platdata(dms);
 	if (ret)
 		return ret;
 	bus->uclass->uc_drv->per_child_platdata_auto_alloc_size = 0;
 	drv->per_child_platdata_auto_alloc_size = size;

 	return 0;
 }
 DM_TEST(dm_test_bus_parent_platdata_uclass,
 	DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /* Test that the child post_bind method is called */
 static int dm_test_bus_child_post_bind(struct dm_test_state *dms)
 {
 	struct dm_test_parent_platdata *plat;
 	struct udevice *bus, *dev;
 	int child_count;

 	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
 	for (device_find_first_child(bus, &dev), child_count = 0;
 	     dev;
 	     device_find_next_child(&dev)) {
 		/* Check that platform data is allocated */
 		plat = dev_get_parent_platdata(dev);
 		ut_assert(plat != NULL);
 		ut_asserteq(1, plat->bind_flag);
 		child_count++;
 	}
 	ut_asserteq(3, child_count);

 	return 0;
 }
 DM_TEST(dm_test_bus_child_post_bind, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /* Test that the child post_bind method is called */
 static int dm_test_bus_child_post_bind_uclass(struct dm_test_state *dms)
 {
 	struct dm_test_parent_platdata *plat;
 	struct udevice *bus, *dev;
 	int child_count;

 	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
 	for (device_find_first_child(bus, &dev), child_count = 0;
 	     dev;
 	     device_find_next_child(&dev)) {
 		/* Check that platform data is allocated */
 		plat = dev_get_parent_platdata(dev);
 		ut_assert(plat != NULL);
 		ut_asserteq(2, plat->uclass_bind_flag);
 		child_count++;
 	}
 	ut_asserteq(3, child_count);

 	return 0;
 }
 DM_TEST(dm_test_bus_child_post_bind_uclass,
 	DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /*
  * Test that the bus' uclass' child_pre_probe() is called before the
  * device's probe() method
  */
 static int dm_test_bus_child_pre_probe_uclass(struct dm_test_state *dms)
 {
 	struct udevice *bus, *dev;
 	int child_count;

 	/*
 	 * See testfdt_drv_probe() which effectively checks that the uclass
 	 * flag is set before that method is called
 	 */
 	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
 	for (device_find_first_child(bus, &dev), child_count = 0;
 	     dev;
 	     device_find_next_child(&dev)) {
 		struct dm_test_priv *priv = dev_get_priv(dev);

 		/* Check that things happened in the right order */
 		ut_asserteq_ptr(NULL, priv);
 		ut_assertok(device_probe(dev));

 		priv = dev_get_priv(dev);
 		ut_assert(priv != NULL);
 		ut_asserteq(1, priv->uclass_flag);
 		ut_asserteq(1, priv->uclass_total);
 		child_count++;
 	}
 	ut_asserteq(3, child_count);

 	return 0;
 }
 DM_TEST(dm_test_bus_child_pre_probe_uclass,
 	DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
	/*
	* Copyright (c) 2014 Google, Inc
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <dm.h>
	#include <dm/device-internal.h>
	#include <dm/root.h>
	#include <dm/test.h>
	#include <dm/uclass-internal.h>
	#include <dm/ut.h>
	#include <dm/util.h>

	DECLARE_GLOBAL_DATA_PTR;

	struct dm_test_parent_platdata {
	int count;
	int bind_flag;
	int uclass_bind_flag;
	};

	enum {
	FLAG_CHILD_PROBED = 10,
	FLAG_CHILD_REMOVED = -7,
	};

	static struct dm_test_state *test_state;

	static int testbus_drv_probe(struct udevice *dev)
	{
	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset, false);
	}

	static int testbus_child_post_bind(struct udevice *dev)
	{
	struct dm_test_parent_platdata *plat;

	plat = dev_get_parent_platdata(dev);
	plat->bind_flag = 1;
	plat->uclass_bind_flag = 2;

	return 0;
	}

	static int testbus_child_pre_probe(struct udevice *dev)
	{
	struct dm_test_parent_data *parent_data = dev_get_parentdata(dev);

	parent_data->flag += FLAG_CHILD_PROBED;

	return 0;
	}

	static int testbus_child_pre_probe_uclass(struct udevice *dev)
	{
	struct dm_test_priv *priv = dev_get_priv(dev);

	priv->uclass_flag++;

	return 0;
	}

	static int testbus_child_post_remove(struct udevice *dev)
	{
	struct dm_test_parent_data *parent_data = dev_get_parentdata(dev);
	struct dm_test_state *dms = test_state;

	parent_data->flag += FLAG_CHILD_REMOVED;
	if (dms)
	dms->removed = dev;

	return 0;
	}

	static const struct udevice_id testbus_ids[] = {
	{
	.compatible = "denx,u-boot-test-bus",
	.data = DM_TEST_TYPE_FIRST },
	{ }
	};

	U_BOOT_DRIVER(testbus_drv) = {
	.name = "testbus_drv",
	.of_match = testbus_ids,
	.id = UCLASS_TEST_BUS,
	.probe = testbus_drv_probe,
	.child_post_bind = testbus_child_post_bind,
	.priv_auto_alloc_size = sizeof(struct dm_test_priv),
	.platdata_auto_alloc_size = sizeof(struct dm_test_pdata),
	.per_child_auto_alloc_size = sizeof(struct dm_test_parent_data),
	.per_child_platdata_auto_alloc_size =
	sizeof(struct dm_test_parent_platdata),
	.child_pre_probe = testbus_child_pre_probe,
	.child_post_remove = testbus_child_post_remove,
	};

	UCLASS_DRIVER(testbus) = {
	.name = "testbus",
	.id = UCLASS_TEST_BUS,
	.flags = DM_UC_FLAG_SEQ_ALIAS,
	.child_pre_probe = testbus_child_pre_probe_uclass,
	};

	/* Test that we can probe for children */
	static int dm_test_bus_children(struct dm_test_state *dms)
	{
	int num_devices = 6;
	struct udevice *bus;
	struct uclass *uc;

	ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));
	ut_asserteq(num_devices, list_count_items(&uc->dev_head));

	/* Probe the bus, which should yield 3 more devices */
	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
	num_devices += 3;

	ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));
	ut_asserteq(num_devices, list_count_items(&uc->dev_head));

	ut_assert(!dm_check_devices(dms, num_devices));

	return 0;
	}
	DM_TEST(dm_test_bus_children, DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/* Test our functions for accessing children */
	static int dm_test_bus_children_funcs(struct dm_test_state *dms)
	{
	const void *blob = gd->fdt_blob;
	struct udevice bus, dev;
	int node;

	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));

	/* device_get_child() */
	ut_assertok(device_get_child(bus, 0, &dev));
	ut_asserteq(-ENODEV, device_get_child(bus, 4, &dev));
	ut_assertok(device_get_child_by_seq(bus, 5, &dev));
	ut_assert(dev->flags & DM_FLAG_ACTIVATED);
	ut_asserteq_str("c-test@5", dev->name);

	/* Device with sequence number 0 should be accessible */
	ut_asserteq(-ENODEV, device_find_child_by_seq(bus, -1, true, &dev));
	ut_assertok(device_find_child_by_seq(bus, 0, true, &dev));
	ut_assert(!(dev->flags & DM_FLAG_ACTIVATED));
	ut_asserteq(-ENODEV, device_find_child_by_seq(bus, 0, false, &dev));
	ut_assertok(device_get_child_by_seq(bus, 0, &dev));
	ut_assert(dev->flags & DM_FLAG_ACTIVATED);

	/* There is no device with sequence number 2 */
	ut_asserteq(-ENODEV, device_find_child_by_seq(bus, 2, false, &dev));
	ut_asserteq(-ENODEV, device_find_child_by_seq(bus, 2, true, &dev));
	ut_asserteq(-ENODEV, device_get_child_by_seq(bus, 2, &dev));

	/* Looking for something that is not a child */
	node = fdt_path_offset(blob, "/junk");
	ut_asserteq(-ENODEV, device_find_child_by_of_offset(bus, node, &dev));
	node = fdt_path_offset(blob, "/d-test");
	ut_asserteq(-ENODEV, device_find_child_by_of_offset(bus, node, &dev));

	/* Find a valid child */
	node = fdt_path_offset(blob, "/some-bus/c-test@1");
	ut_assertok(device_find_child_by_of_offset(bus, node, &dev));
	ut_assert(!(dev->flags & DM_FLAG_ACTIVATED));
	ut_assertok(device_get_child_by_of_offset(bus, node, &dev));
	ut_assert(dev->flags & DM_FLAG_ACTIVATED);

	return 0;
	}
	DM_TEST(dm_test_bus_children_funcs, DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/* Test that we can iterate through children */
	static int dm_test_bus_children_iterators(struct dm_test_state *dms)
	{
	struct udevice bus, dev, *child;

	/* Walk through the children one by one */
	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
	ut_assertok(device_find_first_child(bus, &dev));
	ut_asserteq_str("c-test@5", dev->name);
	ut_assertok(device_find_next_child(&dev));
	ut_asserteq_str("c-test@0", dev->name);
	ut_assertok(device_find_next_child(&dev));
	ut_asserteq_str("c-test@1", dev->name);
	ut_assertok(device_find_next_child(&dev));
	ut_asserteq_ptr(dev, NULL);

	/* Move to the next child without using device_find_first_child() */
	ut_assertok(device_find_child_by_seq(bus, 5, true, &dev));
	ut_asserteq_str("c-test@5", dev->name);
	ut_assertok(device_find_next_child(&dev));
	ut_asserteq_str("c-test@0", dev->name);

	/* Try a device with no children */
	ut_assertok(device_find_first_child(dev, &child));
	ut_asserteq_ptr(child, NULL);

	return 0;
	}
	DM_TEST(dm_test_bus_children_iterators,
	DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/* Test that the bus can store data about each child */
	static int test_bus_parent_data(struct dm_test_state *dms)
	{
	struct dm_test_parent_data *parent_data;
	struct udevice bus, dev;
	struct uclass *uc;
	int value;

	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));

	/* Check that parent data is allocated */
	ut_assertok(device_find_child_by_seq(bus, 0, true, &dev));
	ut_asserteq_ptr(NULL, dev_get_parentdata(dev));
	ut_assertok(device_get_child_by_seq(bus, 0, &dev));
	parent_data = dev_get_parentdata(dev);
	ut_assert(NULL != parent_data);

	/* Check that it starts at 0 and goes away when device is removed */
	parent_data->sum += 5;
	ut_asserteq(5, parent_data->sum);
	device_remove(dev);
	ut_asserteq_ptr(NULL, dev_get_parentdata(dev));

	/* Check that we can do this twice */
	ut_assertok(device_get_child_by_seq(bus, 0, &dev));
	parent_data = dev_get_parentdata(dev);
	ut_assert(NULL != parent_data);
	parent_data->sum += 5;
	ut_asserteq(5, parent_data->sum);

	/* Add parent data to all children */
	ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));
	value = 5;
	uclass_foreach_dev(dev, uc) {
	/* Ignore these if they are not on this bus */
	if (dev->parent != bus) {
	ut_asserteq_ptr(NULL, dev_get_parentdata(dev));
	continue;
	}
	ut_assertok(device_probe(dev));
	parent_data = dev_get_parentdata(dev);

	parent_data->sum = value;
	value += 5;
	}

	/* Check it is still there */
	value = 5;
	uclass_foreach_dev(dev, uc) {
	/* Ignore these if they are not on this bus */
	if (dev->parent != bus)
	continue;
	parent_data = dev_get_parentdata(dev);

	ut_asserteq(value, parent_data->sum);
	value += 5;
	}

	return 0;
	}
	/* Test that the bus can store data about each child */
	static int dm_test_bus_parent_data(struct dm_test_state *dms)
	{
	return test_bus_parent_data(dms);
	}
	DM_TEST(dm_test_bus_parent_data, DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/* As above but the size is controlled by the uclass */
	static int dm_test_bus_parent_data_uclass(struct dm_test_state *dms)
	{
	struct driver *drv;
	struct udevice *bus;
	int size;
	int ret;

	/* Set the driver size to 0 so that the uclass size is used */
	ut_assertok(uclass_find_device(UCLASS_TEST_BUS, 0, &bus));
	drv = (struct driver *)bus->driver;
	size = drv->per_child_auto_alloc_size;
	bus->uclass->uc_drv->per_child_auto_alloc_size = size;
	drv->per_child_auto_alloc_size = 0;
	ret = test_bus_parent_data(dms);
	if (ret)
	return ret;
	bus->uclass->uc_drv->per_child_auto_alloc_size = 0;
	drv->per_child_auto_alloc_size = size;

	return 0;
	}
	DM_TEST(dm_test_bus_parent_data_uclass,
	DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/* Test that the bus ops are called when a child is probed/removed */
	static int dm_test_bus_parent_ops(struct dm_test_state *dms)
	{
	struct dm_test_parent_data *parent_data;
	struct udevice bus, dev;
	struct uclass *uc;

	test_state = dms;
	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
	ut_assertok(uclass_get(UCLASS_TEST_FDT, &uc));

	uclass_foreach_dev(dev, uc) {
	/* Ignore these if they are not on this bus */
	if (dev->parent != bus)
	continue;
	ut_asserteq_ptr(NULL, dev_get_parentdata(dev));

	ut_assertok(device_probe(dev));
	parent_data = dev_get_parentdata(dev);
	ut_asserteq(FLAG_CHILD_PROBED, parent_data->flag);
	}

	uclass_foreach_dev(dev, uc) {
	/* Ignore these if they are not on this bus */
	if (dev->parent != bus)
	continue;
	parent_data = dev_get_parentdata(dev);
	ut_asserteq(FLAG_CHILD_PROBED, parent_data->flag);
	ut_assertok(device_remove(dev));
	ut_asserteq_ptr(NULL, dev_get_parentdata(dev));
	ut_asserteq_ptr(dms->removed, dev);
	}
	test_state = NULL;

	return 0;
	}
	DM_TEST(dm_test_bus_parent_ops, DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	static int test_bus_parent_platdata(struct dm_test_state *dms)
	{
	struct dm_test_parent_platdata *plat;
	struct udevice bus, dev;
	int child_count;

	/* Check that the bus has no children */
	ut_assertok(uclass_find_device(UCLASS_TEST_BUS, 0, &bus));
	device_find_first_child(bus, &dev);
	ut_asserteq_ptr(NULL, dev);

	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));

	for (device_find_first_child(bus, &dev), child_count = 0;
	dev;
	device_find_next_child(&dev)) {
	/* Check that platform data is allocated */
	plat = dev_get_parent_platdata(dev);
	ut_assert(plat != NULL);

	/*
	* Check that it is not affected by the device being
	* probed/removed
	*/
	plat->count++;
	ut_asserteq(1, plat->count);
	device_probe(dev);
	device_remove(dev);

	ut_asserteq_ptr(plat, dev_get_parent_platdata(dev));
	ut_asserteq(1, plat->count);
	ut_assertok(device_probe(dev));
	child_count++;
	}
	ut_asserteq(3, child_count);

	/* Removing the bus should also have no effect (it is still bound) */
	device_remove(bus);
	for (device_find_first_child(bus, &dev), child_count = 0;
	dev;
	device_find_next_child(&dev)) {
	/* Check that platform data is allocated */
	plat = dev_get_parent_platdata(dev);
	ut_assert(plat != NULL);
	ut_asserteq(1, plat->count);
	child_count++;
	}
	ut_asserteq(3, child_count);

	/* Unbind all the children */
	do {
	device_find_first_child(bus, &dev);
	if (dev)
	device_unbind(dev);
	} while (dev);

	/* Now the child platdata should be removed and re-added */
	device_probe(bus);
	for (device_find_first_child(bus, &dev), child_count = 0;
	dev;
	device_find_next_child(&dev)) {
	/* Check that platform data is allocated */
	plat = dev_get_parent_platdata(dev);
	ut_assert(plat != NULL);
	ut_asserteq(0, plat->count);
	child_count++;
	}
	ut_asserteq(3, child_count);

	return 0;
	}

	/* Test that the bus can store platform data about each child */
	static int dm_test_bus_parent_platdata(struct dm_test_state *dms)
	{
	return test_bus_parent_platdata(dms);
	}
	DM_TEST(dm_test_bus_parent_platdata, DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/* As above but the size is controlled by the uclass */
	static int dm_test_bus_parent_platdata_uclass(struct dm_test_state *dms)
	{
	struct udevice *bus;
	struct driver *drv;
	int size;
	int ret;

	/* Set the driver size to 0 so that the uclass size is used */
	ut_assertok(uclass_find_device(UCLASS_TEST_BUS, 0, &bus));
	drv = (struct driver *)bus->driver;
	size = drv->per_child_platdata_auto_alloc_size;
	bus->uclass->uc_drv->per_child_platdata_auto_alloc_size = size;
	drv->per_child_platdata_auto_alloc_size = 0;
	ret = test_bus_parent_platdata(dms);
	if (ret)
	return ret;
	bus->uclass->uc_drv->per_child_platdata_auto_alloc_size = 0;
	drv->per_child_platdata_auto_alloc_size = size;

	return 0;
	}
	DM_TEST(dm_test_bus_parent_platdata_uclass,
	DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/* Test that the child post_bind method is called */
	static int dm_test_bus_child_post_bind(struct dm_test_state *dms)
	{
	struct dm_test_parent_platdata *plat;
	struct udevice bus, dev;
	int child_count;

	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
	for (device_find_first_child(bus, &dev), child_count = 0;
	dev;
	device_find_next_child(&dev)) {
	/* Check that platform data is allocated */
	plat = dev_get_parent_platdata(dev);
	ut_assert(plat != NULL);
	ut_asserteq(1, plat->bind_flag);
	child_count++;
	}
	ut_asserteq(3, child_count);

	return 0;
	}
	DM_TEST(dm_test_bus_child_post_bind, DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/* Test that the child post_bind method is called */
	static int dm_test_bus_child_post_bind_uclass(struct dm_test_state *dms)
	{
	struct dm_test_parent_platdata *plat;
	struct udevice bus, dev;
	int child_count;

	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
	for (device_find_first_child(bus, &dev), child_count = 0;
	dev;
	device_find_next_child(&dev)) {
	/* Check that platform data is allocated */
	plat = dev_get_parent_platdata(dev);
	ut_assert(plat != NULL);
	ut_asserteq(2, plat->uclass_bind_flag);
	child_count++;
	}
	ut_asserteq(3, child_count);

	return 0;
	}
	DM_TEST(dm_test_bus_child_post_bind_uclass,
	DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/*
	* Test that the bus' uclass' child_pre_probe() is called before the
	* device's probe() method
	*/
	static int dm_test_bus_child_pre_probe_uclass(struct dm_test_state *dms)
	{
	struct udevice bus, dev;
	int child_count;

	/*
	* See testfdt_drv_probe() which effectively checks that the uclass
	* flag is set before that method is called
	*/
	ut_assertok(uclass_get_device(UCLASS_TEST_BUS, 0, &bus));
	for (device_find_first_child(bus, &dev), child_count = 0;
	dev;
	device_find_next_child(&dev)) {
	struct dm_test_priv *priv = dev_get_priv(dev);

	/* Check that things happened in the right order */
	ut_asserteq_ptr(NULL, priv);
	ut_assertok(device_probe(dev));

	priv = dev_get_priv(dev);
	ut_assert(priv != NULL);
	ut_asserteq(1, priv->uclass_flag);
	ut_asserteq(1, priv->uclass_total);
	child_count++;
	}
	ut_asserteq(3, child_count);

	return 0;
	}
	DM_TEST(dm_test_bus_child_pre_probe_uclass,
	DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);