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

 /*
  * Copyright (c) 2013 Google, Inc
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>
 #include <malloc.h>
 #include <asm/io.h>
 #include <dm/test.h>
 #include <dm/root.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>
 #include <dm/util.h>
 #include <test/ut.h>

 DECLARE_GLOBAL_DATA_PTR;

 static int testfdt_drv_ping(struct udevice *dev, int pingval, int *pingret)
 {
 	const struct dm_test_pdata *pdata = dev->platdata;
 	struct dm_test_priv *priv = dev_get_priv(dev);

 	*pingret = pingval + pdata->ping_add;
 	priv->ping_total += *pingret;

 	return 0;
 }

 static const struct test_ops test_ops = {
 	.ping = testfdt_drv_ping,
 };

 static int testfdt_ofdata_to_platdata(struct udevice *dev)
 {
 	struct dm_test_pdata *pdata = dev_get_platdata(dev);

 	pdata->ping_add = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
 					"ping-add", -1);
 	pdata->base = fdtdec_get_addr(gd->fdt_blob, dev_of_offset(dev),
 				      "ping-expect");

 	return 0;
 }

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

 	priv->ping_total += DM_TEST_START_TOTAL;

 	/*
 	 * If this device is on a bus, the uclass_flag will be set before
 	 * calling this function. This is used by
 	 * dm_test_bus_child_pre_probe_uclass().
 	 */
 	priv->uclass_total += priv->uclass_flag;

 	return 0;
 }

 static const struct udevice_id testfdt_ids[] = {
 	{
 		.compatible = "denx,u-boot-fdt-test",
 		.data = DM_TEST_TYPE_FIRST },
 	{
 		.compatible = "google,another-fdt-test",
 		.data = DM_TEST_TYPE_SECOND },
 	{ }
 };

 U_BOOT_DRIVER(testfdt_drv) = {
 	.name	= "testfdt_drv",
 	.of_match	= testfdt_ids,
 	.id	= UCLASS_TEST_FDT,
 	.ofdata_to_platdata = testfdt_ofdata_to_platdata,
 	.probe	= testfdt_drv_probe,
 	.ops	= &test_ops,
 	.priv_auto_alloc_size = sizeof(struct dm_test_priv),
 	.platdata_auto_alloc_size = sizeof(struct dm_test_pdata),
 };

 /* From here is the testfdt uclass code */
 int testfdt_ping(struct udevice *dev, int pingval, int *pingret)
 {
 	const struct test_ops *ops = device_get_ops(dev);

 	if (!ops->ping)
 		return -ENOSYS;

 	return ops->ping(dev, pingval, pingret);
 }

 UCLASS_DRIVER(testfdt) = {
 	.name		= "testfdt",
 	.id		= UCLASS_TEST_FDT,
 	.flags		= DM_UC_FLAG_SEQ_ALIAS,
 };

 struct dm_testprobe_pdata {
 	int probe_err;
 };

 static int testprobe_drv_probe(struct udevice *dev)
 {
 	struct dm_testprobe_pdata *pdata = dev_get_platdata(dev);

 	return pdata->probe_err;
 }

 static const struct udevice_id testprobe_ids[] = {
 	{ .compatible = "denx,u-boot-probe-test" },
 	{ }
 };

 U_BOOT_DRIVER(testprobe_drv) = {
 	.name	= "testprobe_drv",
 	.of_match	= testprobe_ids,
 	.id	= UCLASS_TEST_PROBE,
 	.probe	= testprobe_drv_probe,
 	.platdata_auto_alloc_size	= sizeof(struct dm_testprobe_pdata),
 };

 UCLASS_DRIVER(testprobe) = {
 	.name		= "testprobe",
 	.id		= UCLASS_TEST_PROBE,
 	.flags		= DM_UC_FLAG_SEQ_ALIAS,
 };

 int dm_check_devices(struct unit_test_state *uts, int num_devices)
 {
 	struct udevice *dev;
 	int ret;
 	int i;

 	/*
 	 * Now check that the ping adds are what we expect. This is using the
 	 * ping-add property in each node.
 	 */
 	for (i = 0; i < num_devices; i++) {
 		uint32_t base;

 		ret = uclass_get_device(UCLASS_TEST_FDT, i, &dev);
 		ut_assert(!ret);

 		/*
 		 * Get the 'ping-expect' property, which tells us what the
 		 * ping add should be. We don't use the platdata because we
 		 * want to test the code that sets that up
 		 * (testfdt_drv_probe()).
 		 */
 		base = fdtdec_get_addr(gd->fdt_blob, dev_of_offset(dev),
 				       "ping-expect");
 		debug("dev=%d, base=%d: %s\n", i, base,
 		      fdt_get_name(gd->fdt_blob, dev_of_offset(dev), NULL));

 		ut_assert(!dm_check_operations(uts, dev, base,
 					       dev_get_priv(dev)));
 	}

 	return 0;
 }

 /* Test that FDT-based binding works correctly */
 static int dm_test_fdt(struct unit_test_state *uts)
 {
 	const int num_devices = 6;
 	struct udevice *dev;
 	struct uclass *uc;
 	int ret;
 	int i;

 	ret = dm_scan_fdt(gd->fdt_blob, false);
 	ut_assert(!ret);

 	ret = uclass_get(UCLASS_TEST_FDT, &uc);
 	ut_assert(!ret);

 	/* These are num_devices compatible root-level device tree nodes */
 	ut_asserteq(num_devices, list_count_items(&uc->dev_head));

 	/* Each should have platform data but no private data */
 	for (i = 0; i < num_devices; i++) {
 		ret = uclass_find_device(UCLASS_TEST_FDT, i, &dev);
 		ut_assert(!ret);
 		ut_assert(!dev_get_priv(dev));
 		ut_assert(dev->platdata);
 	}

 	ut_assertok(dm_check_devices(uts, num_devices));

 	return 0;
 }
 DM_TEST(dm_test_fdt, 0);

 static int dm_test_fdt_pre_reloc(struct unit_test_state *uts)
 {
 	struct uclass *uc;
 	int ret;

 	ret = dm_scan_fdt(gd->fdt_blob, true);
 	ut_assert(!ret);

 	ret = uclass_get(UCLASS_TEST_FDT, &uc);
 	ut_assert(!ret);

 	/* These is only one pre-reloc device */
 	ut_asserteq(1, list_count_items(&uc->dev_head));

 	return 0;
 }
 DM_TEST(dm_test_fdt_pre_reloc, 0);

 /* Test that sequence numbers are allocated properly */
 static int dm_test_fdt_uclass_seq(struct unit_test_state *uts)
 {
 	struct udevice *dev;

 	/* A few basic santiy tests */
 	ut_assertok(uclass_find_device_by_seq(UCLASS_TEST_FDT, 3, true, &dev));
 	ut_asserteq_str("b-test", dev->name);

 	ut_assertok(uclass_find_device_by_seq(UCLASS_TEST_FDT, 8, true, &dev));
 	ut_asserteq_str("a-test", dev->name);

 	ut_asserteq(-ENODEV, uclass_find_device_by_seq(UCLASS_TEST_FDT, 5,
 						       true, &dev));
 	ut_asserteq_ptr(NULL, dev);

 	/* Test aliases */
 	ut_assertok(uclass_get_device_by_seq(UCLASS_TEST_FDT, 6, &dev));
 	ut_asserteq_str("e-test", dev->name);

 	ut_asserteq(-ENODEV, uclass_find_device_by_seq(UCLASS_TEST_FDT, 7,
 						       true, &dev));

 	/*
 	 * Note that c-test nodes are not probed since it is not a top-level
 	 * node
 	 */
 	ut_assertok(uclass_get_device_by_seq(UCLASS_TEST_FDT, 3, &dev));
 	ut_asserteq_str("b-test", dev->name);

 	/*
 	 * d-test wants sequence number 3 also, but it can't have it because
 	 * b-test gets it first.
 	 */
 	ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 2, &dev));
 	ut_asserteq_str("d-test", dev->name);

 	/* d-test actually gets 0 */
 	ut_assertok(uclass_get_device_by_seq(UCLASS_TEST_FDT, 0, &dev));
 	ut_asserteq_str("d-test", dev->name);

 	/* initially no one wants seq 1 */
 	ut_asserteq(-ENODEV, uclass_get_device_by_seq(UCLASS_TEST_FDT, 1,
 						      &dev));
 	ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 0, &dev));
 	ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 4, &dev));

 	/* But now that it is probed, we can find it */
 	ut_assertok(uclass_get_device_by_seq(UCLASS_TEST_FDT, 1, &dev));
 	ut_asserteq_str("f-test", dev->name);

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

 /* Test that we can find a device by device tree offset */
 static int dm_test_fdt_offset(struct unit_test_state *uts)
 {
 	const void *blob = gd->fdt_blob;
 	struct udevice *dev;
 	int node;

 	node = fdt_path_offset(blob, "/e-test");
 	ut_assert(node > 0);
 	ut_assertok(uclass_get_device_by_of_offset(UCLASS_TEST_FDT, node,
 						   &dev));
 	ut_asserteq_str("e-test", dev->name);

 	/* This node should not be bound */
 	node = fdt_path_offset(blob, "/junk");
 	ut_assert(node > 0);
 	ut_asserteq(-ENODEV, uclass_get_device_by_of_offset(UCLASS_TEST_FDT,
 							    node, &dev));

 	/* This is not a top level node so should not be probed */
 	node = fdt_path_offset(blob, "/some-bus/c-test@5");
 	ut_assert(node > 0);
 	ut_asserteq(-ENODEV, uclass_get_device_by_of_offset(UCLASS_TEST_FDT,
 							    node, &dev));

 	return 0;
 }
 DM_TEST(dm_test_fdt_offset,
 	DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT | DM_TESTF_FLAT_TREE);

 /**
  * Test various error conditions with uclass_first_device() and
  * uclass_next_device()
  */
 static int dm_test_first_next_device(struct unit_test_state *uts)
 {
 	struct dm_testprobe_pdata *pdata;
 	struct udevice *dev, *parent = NULL;
 	int count;
 	int ret;

 	/* There should be 4 devices */
 	for (ret = uclass_first_device(UCLASS_TEST_PROBE, &dev), count = 0;
 	     dev;
 	     ret = uclass_next_device(&dev)) {
 		count++;
 		parent = dev_get_parent(dev);
 		}
 	ut_assertok(ret);
 	ut_asserteq(4, count);

 	/* Remove them and try again, with an error on the second one */
 	ut_assertok(uclass_get_device(UCLASS_TEST_PROBE, 1, &dev));
 	pdata = dev_get_platdata(dev);
 	pdata->probe_err = -ENOMEM;
 	device_remove(parent, DM_REMOVE_NORMAL);
 	ut_assertok(uclass_first_device(UCLASS_TEST_PROBE, &dev));
 	ut_asserteq(-ENOMEM, uclass_next_device(&dev));
 	ut_asserteq_ptr(dev, NULL);

 	/* Now an error on the first one */
 	ut_assertok(uclass_get_device(UCLASS_TEST_PROBE, 0, &dev));
 	pdata = dev_get_platdata(dev);
 	pdata->probe_err = -ENOENT;
 	device_remove(parent, DM_REMOVE_NORMAL);
 	ut_asserteq(-ENOENT, uclass_first_device(UCLASS_TEST_PROBE, &dev));

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

 /**
  * check_devices() - Check return values and pointers
  *
  * This runs through a full sequence of uclass_first_device_check()...
  * uclass_next_device_check() checking that the return values and devices
  * are correct.
  *
  * @uts: Test state
  * @devlist: List of expected devices
  * @mask: Indicates which devices should return an error. Device n should
  *	  return error (-NOENT - n) if bit n is set, or no error (i.e. 0) if
  *	  bit n is clear.
  */
 static int check_devices(struct unit_test_state *uts,
 			 struct udevice *devlist[], int mask)
 {
 	int expected_ret;
 	struct udevice *dev;
 	int i;

 	expected_ret = (mask & 1) ? -ENOENT : 0;
 	mask >>= 1;
 	ut_asserteq(expected_ret,
 		    uclass_first_device_check(UCLASS_TEST_PROBE, &dev));
 	for (i = 0; i < 4; i++) {
 		ut_asserteq_ptr(devlist[i], dev);
 		expected_ret = (mask & 1) ? -ENOENT - (i + 1) : 0;
 		mask >>= 1;
 		ut_asserteq(expected_ret, uclass_next_device_check(&dev));
 	}
 	ut_asserteq_ptr(NULL, dev);

 	return 0;
 }

 /* Test uclass_first_device_check() and uclass_next_device_check() */
 static int dm_test_first_next_ok_device(struct unit_test_state *uts)
 {
 	struct dm_testprobe_pdata *pdata;
 	struct udevice *dev, *parent = NULL, *devlist[4];
 	int count;
 	int ret;

 	/* There should be 4 devices */
 	count = 0;
 	for (ret = uclass_first_device_check(UCLASS_TEST_PROBE, &dev);
 	     dev;
 	     ret = uclass_next_device_check(&dev)) {
 		ut_assertok(ret);
 		devlist[count++] = dev;
 		parent = dev_get_parent(dev);
 		}
 	ut_asserteq(4, count);
 	ut_assertok(uclass_first_device_check(UCLASS_TEST_PROBE, &dev));
 	ut_assertok(check_devices(uts, devlist, 0));

 	/* Remove them and try again, with an error on the second one */
 	pdata = dev_get_platdata(devlist[1]);
 	pdata->probe_err = -ENOENT - 1;
 	device_remove(parent, DM_REMOVE_NORMAL);
 	ut_assertok(check_devices(uts, devlist, 1 << 1));

 	/* Now an error on the first one */
 	pdata = dev_get_platdata(devlist[0]);
 	pdata->probe_err = -ENOENT - 0;
 	device_remove(parent, DM_REMOVE_NORMAL);
 	ut_assertok(check_devices(uts, devlist, 3 << 0));

 	/* Now errors on all */
 	pdata = dev_get_platdata(devlist[2]);
 	pdata->probe_err = -ENOENT - 2;
 	pdata = dev_get_platdata(devlist[3]);
 	pdata->probe_err = -ENOENT - 3;
 	device_remove(parent, DM_REMOVE_NORMAL);
 	ut_assertok(check_devices(uts, devlist, 0xf << 0));

 	return 0;
 }
 DM_TEST(dm_test_first_next_ok_device, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
	/*
	* Copyright (c) 2013 Google, Inc
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <dm.h>
	#include <errno.h>
	#include <fdtdec.h>
	#include <malloc.h>
	#include <asm/io.h>
	#include <dm/test.h>
	#include <dm/root.h>
	#include <dm/device-internal.h>
	#include <dm/uclass-internal.h>
	#include <dm/util.h>
	#include <test/ut.h>

	DECLARE_GLOBAL_DATA_PTR;

	static int testfdt_drv_ping(struct udevice dev, int pingval, int pingret)
	{
	const struct dm_test_pdata *pdata = dev->platdata;
	struct dm_test_priv *priv = dev_get_priv(dev);

	*pingret = pingval + pdata->ping_add;
	priv->ping_total += *pingret;

	return 0;
	}

	static const struct test_ops test_ops = {
	.ping = testfdt_drv_ping,
	};

	static int testfdt_ofdata_to_platdata(struct udevice *dev)
	{
	struct dm_test_pdata *pdata = dev_get_platdata(dev);

	pdata->ping_add = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
	"ping-add", -1);
	pdata->base = fdtdec_get_addr(gd->fdt_blob, dev_of_offset(dev),
	"ping-expect");

	return 0;
	}

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

	priv->ping_total += DM_TEST_START_TOTAL;

	/*
	* If this device is on a bus, the uclass_flag will be set before
	* calling this function. This is used by
	* dm_test_bus_child_pre_probe_uclass().
	*/
	priv->uclass_total += priv->uclass_flag;

	return 0;
	}

	static const struct udevice_id testfdt_ids[] = {
	{
	.compatible = "denx,u-boot-fdt-test",
	.data = DM_TEST_TYPE_FIRST },
	{
	.compatible = "google,another-fdt-test",
	.data = DM_TEST_TYPE_SECOND },
	{ }
	};

	U_BOOT_DRIVER(testfdt_drv) = {
	.name = "testfdt_drv",
	.of_match = testfdt_ids,
	.id = UCLASS_TEST_FDT,
	.ofdata_to_platdata = testfdt_ofdata_to_platdata,
	.probe = testfdt_drv_probe,
	.ops = &test_ops,
	.priv_auto_alloc_size = sizeof(struct dm_test_priv),
	.platdata_auto_alloc_size = sizeof(struct dm_test_pdata),
	};

	/* From here is the testfdt uclass code */
	int testfdt_ping(struct udevice dev, int pingval, int pingret)
	{
	const struct test_ops *ops = device_get_ops(dev);

	if (!ops->ping)
	return -ENOSYS;

	return ops->ping(dev, pingval, pingret);
	}

	UCLASS_DRIVER(testfdt) = {
	.name = "testfdt",
	.id = UCLASS_TEST_FDT,
	.flags = DM_UC_FLAG_SEQ_ALIAS,
	};

	struct dm_testprobe_pdata {
	int probe_err;
	};

	static int testprobe_drv_probe(struct udevice *dev)
	{
	struct dm_testprobe_pdata *pdata = dev_get_platdata(dev);

	return pdata->probe_err;
	}

	static const struct udevice_id testprobe_ids[] = {
	{ .compatible = "denx,u-boot-probe-test" },
	{ }
	};

	U_BOOT_DRIVER(testprobe_drv) = {
	.name = "testprobe_drv",
	.of_match = testprobe_ids,
	.id = UCLASS_TEST_PROBE,
	.probe = testprobe_drv_probe,
	.platdata_auto_alloc_size = sizeof(struct dm_testprobe_pdata),
	};

	UCLASS_DRIVER(testprobe) = {
	.name = "testprobe",
	.id = UCLASS_TEST_PROBE,
	.flags = DM_UC_FLAG_SEQ_ALIAS,
	};

	int dm_check_devices(struct unit_test_state *uts, int num_devices)
	{
	struct udevice *dev;
	int ret;
	int i;

	/*
	* Now check that the ping adds are what we expect. This is using the
	* ping-add property in each node.
	*/
	for (i = 0; i < num_devices; i++) {
	uint32_t base;

	ret = uclass_get_device(UCLASS_TEST_FDT, i, &dev);
	ut_assert(!ret);

	/*
	* Get the 'ping-expect' property, which tells us what the
	* ping add should be. We don't use the platdata because we
	* want to test the code that sets that up
	* (testfdt_drv_probe()).
	*/
	base = fdtdec_get_addr(gd->fdt_blob, dev_of_offset(dev),
	"ping-expect");
	debug("dev=%d, base=%d: %s\n", i, base,
	fdt_get_name(gd->fdt_blob, dev_of_offset(dev), NULL));

	ut_assert(!dm_check_operations(uts, dev, base,
	dev_get_priv(dev)));
	}

	return 0;
	}

	/* Test that FDT-based binding works correctly */
	static int dm_test_fdt(struct unit_test_state *uts)
	{
	const int num_devices = 6;
	struct udevice *dev;
	struct uclass *uc;
	int ret;
	int i;

	ret = dm_scan_fdt(gd->fdt_blob, false);
	ut_assert(!ret);

	ret = uclass_get(UCLASS_TEST_FDT, &uc);
	ut_assert(!ret);

	/* These are num_devices compatible root-level device tree nodes */
	ut_asserteq(num_devices, list_count_items(&uc->dev_head));

	/* Each should have platform data but no private data */
	for (i = 0; i < num_devices; i++) {
	ret = uclass_find_device(UCLASS_TEST_FDT, i, &dev);
	ut_assert(!ret);
	ut_assert(!dev_get_priv(dev));
	ut_assert(dev->platdata);
	}

	ut_assertok(dm_check_devices(uts, num_devices));

	return 0;
	}
	DM_TEST(dm_test_fdt, 0);

	static int dm_test_fdt_pre_reloc(struct unit_test_state *uts)
	{
	struct uclass *uc;
	int ret;

	ret = dm_scan_fdt(gd->fdt_blob, true);
	ut_assert(!ret);

	ret = uclass_get(UCLASS_TEST_FDT, &uc);
	ut_assert(!ret);

	/* These is only one pre-reloc device */
	ut_asserteq(1, list_count_items(&uc->dev_head));

	return 0;
	}
	DM_TEST(dm_test_fdt_pre_reloc, 0);

	/* Test that sequence numbers are allocated properly */
	static int dm_test_fdt_uclass_seq(struct unit_test_state *uts)
	{
	struct udevice *dev;

	/* A few basic santiy tests */
	ut_assertok(uclass_find_device_by_seq(UCLASS_TEST_FDT, 3, true, &dev));
	ut_asserteq_str("b-test", dev->name);

	ut_assertok(uclass_find_device_by_seq(UCLASS_TEST_FDT, 8, true, &dev));
	ut_asserteq_str("a-test", dev->name);

	ut_asserteq(-ENODEV, uclass_find_device_by_seq(UCLASS_TEST_FDT, 5,
	true, &dev));
	ut_asserteq_ptr(NULL, dev);

	/* Test aliases */
	ut_assertok(uclass_get_device_by_seq(UCLASS_TEST_FDT, 6, &dev));
	ut_asserteq_str("e-test", dev->name);

	ut_asserteq(-ENODEV, uclass_find_device_by_seq(UCLASS_TEST_FDT, 7,
	true, &dev));

	/*
	* Note that c-test nodes are not probed since it is not a top-level
	* node
	*/
	ut_assertok(uclass_get_device_by_seq(UCLASS_TEST_FDT, 3, &dev));
	ut_asserteq_str("b-test", dev->name);

	/*
	* d-test wants sequence number 3 also, but it can't have it because
	* b-test gets it first.
	*/
	ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 2, &dev));
	ut_asserteq_str("d-test", dev->name);

	/* d-test actually gets 0 */
	ut_assertok(uclass_get_device_by_seq(UCLASS_TEST_FDT, 0, &dev));
	ut_asserteq_str("d-test", dev->name);

	/* initially no one wants seq 1 */
	ut_asserteq(-ENODEV, uclass_get_device_by_seq(UCLASS_TEST_FDT, 1,
	&dev));
	ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 0, &dev));
	ut_assertok(uclass_get_device(UCLASS_TEST_FDT, 4, &dev));

	/* But now that it is probed, we can find it */
	ut_assertok(uclass_get_device_by_seq(UCLASS_TEST_FDT, 1, &dev));
	ut_asserteq_str("f-test", dev->name);

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

	/* Test that we can find a device by device tree offset */
	static int dm_test_fdt_offset(struct unit_test_state *uts)
	{
	const void *blob = gd->fdt_blob;
	struct udevice *dev;
	int node;

	node = fdt_path_offset(blob, "/e-test");
	ut_assert(node > 0);
	ut_assertok(uclass_get_device_by_of_offset(UCLASS_TEST_FDT, node,
	&dev));
	ut_asserteq_str("e-test", dev->name);

	/* This node should not be bound */
	node = fdt_path_offset(blob, "/junk");
	ut_assert(node > 0);
	ut_asserteq(-ENODEV, uclass_get_device_by_of_offset(UCLASS_TEST_FDT,
	node, &dev));

	/* This is not a top level node so should not be probed */
	node = fdt_path_offset(blob, "/some-bus/c-test@5");
	ut_assert(node > 0);
	ut_asserteq(-ENODEV, uclass_get_device_by_of_offset(UCLASS_TEST_FDT,
	node, &dev));

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

	/**
	* Test various error conditions with uclass_first_device() and
	* uclass_next_device()
	*/
	static int dm_test_first_next_device(struct unit_test_state *uts)
	{
	struct dm_testprobe_pdata *pdata;
	struct udevice dev, parent = NULL;
	int count;
	int ret;

	/* There should be 4 devices */
	for (ret = uclass_first_device(UCLASS_TEST_PROBE, &dev), count = 0;
	dev;
	ret = uclass_next_device(&dev)) {
	count++;
	parent = dev_get_parent(dev);
	}
	ut_assertok(ret);
	ut_asserteq(4, count);

	/* Remove them and try again, with an error on the second one */
	ut_assertok(uclass_get_device(UCLASS_TEST_PROBE, 1, &dev));
	pdata = dev_get_platdata(dev);
	pdata->probe_err = -ENOMEM;
	device_remove(parent, DM_REMOVE_NORMAL);
	ut_assertok(uclass_first_device(UCLASS_TEST_PROBE, &dev));
	ut_asserteq(-ENOMEM, uclass_next_device(&dev));
	ut_asserteq_ptr(dev, NULL);

	/* Now an error on the first one */
	ut_assertok(uclass_get_device(UCLASS_TEST_PROBE, 0, &dev));
	pdata = dev_get_platdata(dev);
	pdata->probe_err = -ENOENT;
	device_remove(parent, DM_REMOVE_NORMAL);
	ut_asserteq(-ENOENT, uclass_first_device(UCLASS_TEST_PROBE, &dev));

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

	/**
	* check_devices() - Check return values and pointers
	*
	* This runs through a full sequence of uclass_first_device_check()...
	* uclass_next_device_check() checking that the return values and devices
	* are correct.
	*
	* @uts: Test state
	* @devlist: List of expected devices
	* @mask: Indicates which devices should return an error. Device n should
	* return error (-NOENT - n) if bit n is set, or no error (i.e. 0) if
	* bit n is clear.
	*/
	static int check_devices(struct unit_test_state *uts,
	struct udevice *devlist[], int mask)
	{
	int expected_ret;
	struct udevice *dev;
	int i;

	expected_ret = (mask & 1) ? -ENOENT : 0;
	mask >>= 1;
	ut_asserteq(expected_ret,
	uclass_first_device_check(UCLASS_TEST_PROBE, &dev));
	for (i = 0; i < 4; i++) {
	ut_asserteq_ptr(devlist[i], dev);
	expected_ret = (mask & 1) ? -ENOENT - (i + 1) : 0;
	mask >>= 1;
	ut_asserteq(expected_ret, uclass_next_device_check(&dev));
	}
	ut_asserteq_ptr(NULL, dev);

	return 0;
	}

	/* Test uclass_first_device_check() and uclass_next_device_check() */
	static int dm_test_first_next_ok_device(struct unit_test_state *uts)
	{
	struct dm_testprobe_pdata *pdata;
	struct udevice dev, parent = NULL, *devlist[4];
	int count;
	int ret;

	/* There should be 4 devices */
	count = 0;
	for (ret = uclass_first_device_check(UCLASS_TEST_PROBE, &dev);
	dev;
	ret = uclass_next_device_check(&dev)) {
	ut_assertok(ret);
	devlist[count++] = dev;
	parent = dev_get_parent(dev);
	}
	ut_asserteq(4, count);
	ut_assertok(uclass_first_device_check(UCLASS_TEST_PROBE, &dev));
	ut_assertok(check_devices(uts, devlist, 0));

	/* Remove them and try again, with an error on the second one */
	pdata = dev_get_platdata(devlist[1]);
	pdata->probe_err = -ENOENT - 1;
	device_remove(parent, DM_REMOVE_NORMAL);
	ut_assertok(check_devices(uts, devlist, 1 << 1));

	/* Now an error on the first one */
	pdata = dev_get_platdata(devlist[0]);
	pdata->probe_err = -ENOENT - 0;
	device_remove(parent, DM_REMOVE_NORMAL);
	ut_assertok(check_devices(uts, devlist, 3 << 0));

	/* Now errors on all */
	pdata = dev_get_platdata(devlist[2]);
	pdata->probe_err = -ENOENT - 2;
	pdata = dev_get_platdata(devlist[3]);
	pdata->probe_err = -ENOENT - 3;
	device_remove(parent, DM_REMOVE_NORMAL);
	ut_assertok(check_devices(uts, devlist, 0xf << 0));

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