dm: Add basic tests

Add some tests of driver model functionality. Coverage includes:

- basic init
- binding of drivers to devices using platform_data
- automatic probing of devices when referenced
- availability of platform data to devices
- lifecycle from bind to probe to remove to unbind
- renumbering within a uclass when devices are probed/removed
- calling driver-defined operations
- deactivation of drivers when removed
- memory leak across creation and destruction of drivers/uclasses
- uclass init/destroy methods
- automatic probe/remove of children/parents when needed

This function is enabled for sandbox, using CONFIG_DM_TEST.

Signed-off-by: Simon Glass <sjg@chromium.org>

14 files changed, 1426 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 9b589a4..c6d1afa 100644
--- a/Makefile
+++ b/Makefile
@@ -626,6 +626,7 @@ libs-y += lib/libfdt/
 libs-$(CONFIG_API) += api/
 libs-$(CONFIG_HAS_POST) += post/
 libs-y += test/
+libs-y += test/dm/
 
 ifneq (,$(filter $(SOC), mx25 mx27 mx5 mx6 mx31 mx35 mxs vf610))
 libs-y += arch/$(ARCH)/imx-common/
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index 9cdfcc7..c9c8509 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -21,6 +21,7 @@
 #define CONFIG_BOOTSTAGE
 #define CONFIG_BOOTSTAGE_REPORT
 #define CONFIG_DM
+#define CONFIG_DM_TEST
 
 /* Number of bits in a C 'long' on this architecture */
 #define CONFIG_SANDBOX_BITS_PER_LONG	64
diff --git a/include/dm/test.h b/include/dm/test.h
new file mode 100644
index 0000000..eeaa2eb
--- /dev/null
+++ b/include/dm/test.h
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 2013 Google, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __DM_TEST_H
+#define __DM_TEST_H
+
+#include <dm.h>
+
+/**
+ * struct dm_test_cdata - configuration data for test instance
+ *
+ * @ping_add: Amonut to add each time we get a ping
+ * @base: Base address of this device
+ */
+struct dm_test_pdata {
+	int ping_add;
+	uint32_t base;
+};
+
+/**
+ * struct test_ops - Operations supported by the test device
+ *
+ * @ping: Ping operation
+ *	@dev: Device to operate on
+ *	@pingval: Value to ping the device with
+ *	@pingret: Returns resulting value from driver
+ *	@return 0 if OK, -ve on error
+ */
+struct test_ops {
+	int (*ping)(struct device *dev, int pingval, int *pingret);
+};
+
+/* Operations that our test driver supports */
+enum {
+	DM_TEST_OP_BIND = 0,
+	DM_TEST_OP_UNBIND,
+	DM_TEST_OP_PROBE,
+	DM_TEST_OP_REMOVE,
+
+	/* For uclass */
+	DM_TEST_OP_POST_BIND,
+	DM_TEST_OP_PRE_UNBIND,
+	DM_TEST_OP_POST_PROBE,
+	DM_TEST_OP_PRE_REMOVE,
+	DM_TEST_OP_INIT,
+	DM_TEST_OP_DESTROY,
+
+	DM_TEST_OP_COUNT,
+};
+
+/* Test driver types */
+enum {
+	DM_TEST_TYPE_FIRST = 0,
+	DM_TEST_TYPE_SECOND,
+};
+
+/* The number added to the ping total on each probe */
+#define DM_TEST_START_TOTAL	5
+
+/**
+ * struct dm_test_priv - private data for the test devices
+ */
+struct dm_test_priv {
+	int ping_total;
+	int op_count[DM_TEST_OP_COUNT];
+};
+
+/**
+ * struct dm_test_perdev_class_priv - private per-device data for test uclass
+ */
+struct dm_test_uclass_perdev_priv {
+	int base_add;
+};
+
+/**
+ * struct dm_test_uclass_priv - private data for test uclass
+ */
+struct dm_test_uclass_priv {
+	int total_add;
+};
+
+/*
+ * Operation counts for the test driver, used to check that each method is
+ * called correctly
+ */
+extern int dm_testdrv_op_count[DM_TEST_OP_COUNT];
+
+extern struct dm_test_state global_test_state;
+
+/*
+ * struct dm_test_state - Entire state of dm test system
+ *
+ * This is often abreviated to dms.
+ *
+ * @root: Root device
+ * @testdev: Test device
+ * @fail_count: Number of tests that failed
+ * @force_fail_alloc: Force all memory allocs to fail
+ * @skip_post_probe: Skip uclass post-probe processing
+ */
+struct dm_test_state {
+	struct device *root;
+	struct device *testdev;
+	int fail_count;
+	int force_fail_alloc;
+	int skip_post_probe;
+};
+
+/* Test flags for each test */
+enum {
+	DM_TESTF_SCAN_PDATA	= 1 << 0,	/* test needs platform data */
+	DM_TESTF_PROBE_TEST	= 1 << 1,	/* probe test uclass */
+	DM_TESTF_SCAN_FDT	= 1 << 2,	/* scan device tree */
+};
+
+/**
+ * struct dm_test - Information about a driver model test
+ *
+ * @name: Name of test
+ * @func: Function to call to perform test
+ * @flags: Flags indicated pre-conditions for test
+ */
+struct dm_test {
+	const char *name;
+	int (*func)(struct dm_test_state *dms);
+	int flags;
+};
+
+/* Declare a new driver model test */
+#define DM_TEST(_name, _flags)						\
+	ll_entry_declare(struct dm_test, _name, dm_test) = {		\
+		.name = #_name,						\
+		.flags = _flags,					\
+		.func = _name,						\
+	}
+
+/* Declare ping methods for the drivers */
+int test_ping(struct device *dev, int pingval, int *pingret);
+int testfdt_ping(struct device *dev, int pingval, int *pingret);
+
+/**
+ * dm_check_operations() - Check that we can perform ping operations
+ *
+ * This checks that the ping operations work as expected for a device
+ *
+ * @dms: Overall test state
+ * @dev: Device to test
+ * @base: Base address, used to check ping return value
+ * @priv: Pointer to private test information
+ * @return 0 if OK, -ve on error
+ */
+int dm_check_operations(struct dm_test_state *dms, struct device *dev,
+			uint32_t base, struct dm_test_priv *priv);
+
+/**
+ * dm_test_main() - Run all the tests
+ *
+ * This runs all available driver model tests
+ *
+ * @return 0 if OK, -ve on error
+ */
+int dm_test_main(void);
+
+#endif
diff --git a/include/dm/ut.h b/include/dm/ut.h
new file mode 100644
index 0000000..fa9eac0
--- /dev/null
+++ b/include/dm/ut.h
@@ -0,0 +1,95 @@
+/*
+ * Simple unit test library for driver model
+ *
+ * Copyright (c) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __DM_UT_H
+#define __DM_UT_H
+
+struct dm_test_state;
+
+/**
+ * ut_fail() - Record failure of a unit test
+ *
+ * @dms: Test state
+ * @fname: Filename where the error occured
+ * @line: Line number where the error occured
+ * @func: Function name where the error occured
+ * @cond: The condition that failed
+ */
+void ut_fail(struct dm_test_state *dms, const char *fname, int line,
+	     const char *func, const char *cond);
+
+/**
+ * ut_failf() - Record failure of a unit test
+ *
+ * @dms: Test state
+ * @fname: Filename where the error occured
+ * @line: Line number where the error occured
+ * @func: Function name where the error occured
+ * @cond: The condition that failed
+ * @fmt: printf() format string for the error, followed by args
+ */
+void ut_failf(struct dm_test_state *dms, const char *fname, int line,
+	      const char *func, const char *cond, const char *fmt, ...)
+			__attribute__ ((format (__printf__, 6, 7)));
+
+
+/* Assert that a condition is non-zero */
+#define ut_assert(cond)							\
+	if (!(cond)) {							\
+		ut_fail(dms, __FILE__, __LINE__, __func__, #cond);	\
+		return -1;						\
+	}
+
+/* Assert that a condition is non-zero, with printf() string */
+#define ut_assertf(cond, fmt, args...)					\
+	if (!(cond)) {							\
+		ut_failf(dms, __FILE__, __LINE__, __func__, #cond,	\
+			 fmt, ##args);					\
+		return -1;						\
+	}
+
+/* Assert that two int expressions are equal */
+#define ut_asserteq(expr1, expr2) {					\
+	unsigned int val1 = (expr1), val2 = (expr2);			\
+									\
+	if (val1 != val2) {						\
+		ut_failf(dms, __FILE__, __LINE__, __func__,		\
+			 #expr1 " == " #expr2,				\
+			 "Expected %d, got %d", val1, val2);		\
+		return -1;						\
+	}								\
+}
+
+/* Assert that two string expressions are equal */
+#define ut_asserteq_str(expr1, expr2) {					\
+	const char *val1 = (expr1), *val2 = (expr2);			\
+									\
+	if (strcmp(val1, val2)) {					\
+		ut_failf(dms, __FILE__, __LINE__, __func__,		\
+			 #expr1 " = " #expr2,				\
+			 "Expected \"%s\", got \"%s\"", val1, val2);	\
+		return -1;						\
+	}								\
+}
+
+/* Assert that two pointers are equal */
+#define ut_asserteq_ptr(expr1, expr2) {					\
+	const void *val1 = (expr1), *val2 = (expr2);			\
+									\
+	if (val1 != val2) {						\
+		ut_failf(dms, __FILE__, __LINE__, __func__,		\
+			 #expr1 " = " #expr2,				\
+			 "Expected %p, got %p", val1, val2);		\
+		return -1;						\
+	}								\
+}
+
+/* Assert that an operation succeeds (returns 0) */
+#define ut_assertok(cond)	ut_asserteq(0, cond)
+
+#endif
diff --git a/test/dm/.gitignore b/test/dm/.gitignore
new file mode 100644
index 0000000..b741b8a
--- /dev/null
+++ b/test/dm/.gitignore
@@ -0,0 +1 @@
+/test.dtb
diff --git a/test/dm/Makefile b/test/dm/Makefile
new file mode 100644
index 0000000..6af85b9
--- /dev/null
+++ b/test/dm/Makefile
@@ -0,0 +1,17 @@
+#
+# Copyright (c) 2013 Google, Inc
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-$(CONFIG_DM_TEST) += test-driver.o
+obj-$(CONFIG_DM_TEST) += test-fdt.o
+obj-$(CONFIG_DM_TEST) += test-main.o
+obj-$(CONFIG_DM_TEST) += test-uclass.o
+obj-$(CONFIG_DM_TEST) += ut.o
+
+# Tests for particular subsystems - when enabling driver model for a new
+# subsystem you must add sandbox tests here.
+obj-$(CONFIG_DM_TEST) += core.o
+obj-$(CONFIG_DM_TEST) += ut.o
+obj-$(CONFIG_DM_GPIO) += gpio.o
diff --git a/test/dm/core.c b/test/dm/core.c
new file mode 100644
index 0000000..14a57c3
--- /dev/null
+++ b/test/dm/core.c
@@ -0,0 +1,544 @@
+/*
+ * Tests for the core driver model code
+ *
+ * Copyright (c) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <dm/device-internal.h>
+#include <dm/root.h>
+#include <dm/ut.h>
+#include <dm/util.h>
+#include <dm/test.h>
+#include <dm/uclass-internal.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+enum {
+	TEST_INTVAL1		= 0,
+	TEST_INTVAL2		= 3,
+	TEST_INTVAL3		= 6,
+	TEST_INTVAL_MANUAL	= 101112,
+};
+
+static const struct dm_test_pdata test_pdata[] = {
+	{ .ping_add		= TEST_INTVAL1, },
+	{ .ping_add		= TEST_INTVAL2, },
+	{ .ping_add		= TEST_INTVAL3, },
+};
+
+static const struct dm_test_pdata test_pdata_manual = {
+	.ping_add		= TEST_INTVAL_MANUAL,
+};
+
+U_BOOT_DEVICE(dm_test_info1) = {
+	.name = "test_drv",
+	.platdata = &test_pdata[0],
+};
+
+U_BOOT_DEVICE(dm_test_info2) = {
+	.name = "test_drv",
+	.platdata = &test_pdata[1],
+};
+
+U_BOOT_DEVICE(dm_test_info3) = {
+	.name = "test_drv",
+	.platdata = &test_pdata[2],
+};
+
+static struct driver_info driver_info_manual = {
+	.name = "test_manual_drv",
+	.platdata = &test_pdata_manual,
+};
+
+/* Test that binding with platdata occurs correctly */
+static int dm_test_autobind(struct dm_test_state *dms)
+{
+	struct device *dev;
+
+	/*
+	 * We should have a single class (UCLASS_ROOT) and a single root
+	 * device with no children.
+	 */
+	ut_assert(dms->root);
+	ut_asserteq(1, list_count_items(&gd->uclass_root));
+	ut_asserteq(0, list_count_items(&gd->dm_root->child_head));
+	ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_POST_BIND]);
+
+	ut_assertok(dm_scan_platdata());
+
+	/* We should have our test class now at least, plus more children */
+	ut_assert(1 < list_count_items(&gd->uclass_root));
+	ut_assert(0 < list_count_items(&gd->dm_root->child_head));
+
+	/* Our 3 dm_test_infox children should be bound to the test uclass */
+	ut_asserteq(3, dm_testdrv_op_count[DM_TEST_OP_POST_BIND]);
+
+	/* No devices should be probed */
+	list_for_each_entry(dev, &gd->dm_root->child_head, sibling_node)
+		ut_assert(!(dev->flags & DM_FLAG_ACTIVATED));
+
+	/* Our test driver should have been bound 3 times */
+	ut_assert(dm_testdrv_op_count[DM_TEST_OP_BIND] == 3);
+
+	return 0;
+}
+DM_TEST(dm_test_autobind, 0);
+
+/* Test that autoprobe finds all the expected devices */
+static int dm_test_autoprobe(struct dm_test_state *dms)
+{
+	int expected_base_add;
+	struct device *dev;
+	struct uclass *uc;
+	int i;
+
+	ut_assertok(uclass_get(UCLASS_TEST, &uc));
+	ut_assert(uc);
+
+	ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_INIT]);
+	ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_POST_PROBE]);
+
+	/* The root device should not be activated until needed */
+	ut_assert(!(dms->root->flags & DM_FLAG_ACTIVATED));
+
+	/*
+	 * We should be able to find the three test devices, and they should
+	 * all be activated as they are used (lazy activation, required by
+	 * U-Boot)
+	 */
+	for (i = 0; i < 3; i++) {
+		ut_assertok(uclass_find_device(UCLASS_TEST, i, &dev));
+		ut_assert(dev);
+		ut_assertf(!(dev->flags & DM_FLAG_ACTIVATED),
+			   "Driver %d/%s already activated", i, dev->name);
+
+		/* This should activate it */
+		ut_assertok(uclass_get_device(UCLASS_TEST, i, &dev));
+		ut_assert(dev);
+		ut_assert(dev->flags & DM_FLAG_ACTIVATED);
+
+		/* Activating a device should activate the root device */
+		if (!i)
+			ut_assert(dms->root->flags & DM_FLAG_ACTIVATED);
+	}
+
+	/* Our 3 dm_test_infox children should be passed to post_probe */
+	ut_asserteq(3, dm_testdrv_op_count[DM_TEST_OP_POST_PROBE]);
+
+	/* Also we can check the per-device data */
+	expected_base_add = 0;
+	for (i = 0; i < 3; i++) {
+		struct dm_test_uclass_perdev_priv *priv;
+		struct dm_test_pdata *pdata;
+
+		ut_assertok(uclass_find_device(UCLASS_TEST, i, &dev));
+		ut_assert(dev);
+
+		priv = dev->uclass_priv;
+		ut_assert(priv);
+		ut_asserteq(expected_base_add, priv->base_add);
+
+		pdata = dev->platdata;
+		expected_base_add += pdata->ping_add;
+	}
+
+	return 0;
+}
+DM_TEST(dm_test_autoprobe, DM_TESTF_SCAN_PDATA);
+
+/* Check that we see the correct platdata in each device */
+static int dm_test_platdata(struct dm_test_state *dms)
+{
+	const struct dm_test_pdata *pdata;
+	struct device *dev;
+	int i;
+
+	for (i = 0; i < 3; i++) {
+		ut_assertok(uclass_find_device(UCLASS_TEST, i, &dev));
+		ut_assert(dev);
+		pdata = dev->platdata;
+		ut_assert(pdata->ping_add == test_pdata[i].ping_add);
+	}
+
+	return 0;
+}
+DM_TEST(dm_test_platdata, DM_TESTF_SCAN_PDATA);
+
+/* Test that we can bind, probe, remove, unbind a driver */
+static int dm_test_lifecycle(struct dm_test_state *dms)
+{
+	int op_count[DM_TEST_OP_COUNT];
+	struct device *dev, *test_dev;
+	int pingret;
+	int ret;
+
+	memcpy(op_count, dm_testdrv_op_count, sizeof(op_count));
+
+	ut_assertok(device_bind_by_name(dms->root, &driver_info_manual,
+					&dev));
+	ut_assert(dev);
+	ut_assert(dm_testdrv_op_count[DM_TEST_OP_BIND]
+			== op_count[DM_TEST_OP_BIND] + 1);
+	ut_assert(!dev->priv);
+
+	/* Probe the device - it should fail allocating private data */
+	dms->force_fail_alloc = 1;
+	ret = device_probe(dev);
+	ut_assert(ret == -ENOMEM);
+	ut_assert(dm_testdrv_op_count[DM_TEST_OP_PROBE]
+			== op_count[DM_TEST_OP_PROBE] + 1);
+	ut_assert(!dev->priv);
+
+	/* Try again without the alloc failure */
+	dms->force_fail_alloc = 0;
+	ut_assertok(device_probe(dev));
+	ut_assert(dm_testdrv_op_count[DM_TEST_OP_PROBE]
+			== op_count[DM_TEST_OP_PROBE] + 2);
+	ut_assert(dev->priv);
+
+	/* This should be device 3 in the uclass */
+	ut_assertok(uclass_find_device(UCLASS_TEST, 3, &test_dev));
+	ut_assert(dev == test_dev);
+
+	/* Try ping */
+	ut_assertok(test_ping(dev, 100, &pingret));
+	ut_assert(pingret == 102);
+
+	/* Now remove device 3 */
+	ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_PRE_REMOVE]);
+	ut_assertok(device_remove(dev));
+	ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_PRE_REMOVE]);
+
+	ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_UNBIND]);
+	ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_PRE_UNBIND]);
+	ut_assertok(device_unbind(dev));
+	ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_UNBIND]);
+	ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_PRE_UNBIND]);
+
+	return 0;
+}
+DM_TEST(dm_test_lifecycle, DM_TESTF_SCAN_PDATA | DM_TESTF_PROBE_TEST);
+
+/* Test that we can bind/unbind and the lists update correctly */
+static int dm_test_ordering(struct dm_test_state *dms)
+{
+	struct device *dev, *dev_penultimate, *dev_last, *test_dev;
+	int pingret;
+
+	ut_assertok(device_bind_by_name(dms->root, &driver_info_manual,
+					&dev));
+	ut_assert(dev);
+
+	/* Bind two new devices (numbers 4 and 5) */
+	ut_assertok(device_bind_by_name(dms->root, &driver_info_manual,
+					&dev_penultimate));
+	ut_assert(dev_penultimate);
+	ut_assertok(device_bind_by_name(dms->root, &driver_info_manual,
+					&dev_last));
+	ut_assert(dev_last);
+
+	/* Now remove device 3 */
+	ut_assertok(device_remove(dev));
+	ut_assertok(device_unbind(dev));
+
+	/* The device numbering should have shifted down one */
+	ut_assertok(uclass_find_device(UCLASS_TEST, 3, &test_dev));
+	ut_assert(dev_penultimate == test_dev);
+	ut_assertok(uclass_find_device(UCLASS_TEST, 4, &test_dev));
+	ut_assert(dev_last == test_dev);
+
+	/* Add back the original device 3, now in position 5 */
+	ut_assertok(device_bind_by_name(dms->root, &driver_info_manual, &dev));
+	ut_assert(dev);
+
+	/* Try ping */
+	ut_assertok(test_ping(dev, 100, &pingret));
+	ut_assert(pingret == 102);
+
+	/* Remove 3 and 4 */
+	ut_assertok(device_remove(dev_penultimate));
+	ut_assertok(device_unbind(dev_penultimate));
+	ut_assertok(device_remove(dev_last));
+	ut_assertok(device_unbind(dev_last));
+
+	/* Our device should now be in position 3 */
+	ut_assertok(uclass_find_device(UCLASS_TEST, 3, &test_dev));
+	ut_assert(dev == test_dev);
+
+	/* Now remove device 3 */
+	ut_assertok(device_remove(dev));
+	ut_assertok(device_unbind(dev));
+
+	return 0;
+}
+DM_TEST(dm_test_ordering, DM_TESTF_SCAN_PDATA);
+
+/* Check that we can perform operations on a device (do a ping) */
+int dm_check_operations(struct dm_test_state *dms, struct device *dev,
+			uint32_t base, struct dm_test_priv *priv)
+{
+	int expected;
+	int pingret;
+
+	/* Getting the child device should allocate platdata / priv */
+	ut_assertok(testfdt_ping(dev, 10, &pingret));
+	ut_assert(dev->priv);
+	ut_assert(dev->platdata);
+
+	expected = 10 + base;
+	ut_asserteq(expected, pingret);
+
+	/* Do another ping */
+	ut_assertok(testfdt_ping(dev, 20, &pingret));
+	expected = 20 + base;
+	ut_asserteq(expected, pingret);
+
+	/* Now check the ping_total */
+	priv = dev->priv;
+	ut_asserteq(DM_TEST_START_TOTAL + 10 + 20 + base * 2,
+		    priv->ping_total);
+
+	return 0;
+}
+
+/* Check that we can perform operations on devices */
+static int dm_test_operations(struct dm_test_state *dms)
+{
+	struct device *dev;
+	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 < ARRAY_SIZE(test_pdata); i++) {
+		uint32_t base;
+
+		ut_assertok(uclass_get_device(UCLASS_TEST, i, &dev));
+
+		/*
+		 * Get the 'reg' 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 = test_pdata[i].ping_add;
+		debug("dev=%d, base=%d\n", i, base);
+
+		ut_assert(!dm_check_operations(dms, dev, base, dev->priv));
+	}
+
+	return 0;
+}
+DM_TEST(dm_test_operations, DM_TESTF_SCAN_PDATA);
+
+/* Remove all drivers and check that things work */
+static int dm_test_remove(struct dm_test_state *dms)
+{
+	struct device *dev;
+	int i;
+
+	for (i = 0; i < 3; i++) {
+		ut_assertok(uclass_find_device(UCLASS_TEST, i, &dev));
+		ut_assert(dev);
+		ut_assertf(dev->flags & DM_FLAG_ACTIVATED,
+			   "Driver %d/%s not activated", i, dev->name);
+		ut_assertok(device_remove(dev));
+		ut_assertf(!(dev->flags & DM_FLAG_ACTIVATED),
+			   "Driver %d/%s should have deactivated", i,
+			   dev->name);
+		ut_assert(!dev->priv);
+	}
+
+	return 0;
+}
+DM_TEST(dm_test_remove, DM_TESTF_SCAN_PDATA | DM_TESTF_PROBE_TEST);
+
+/* Remove and recreate everything, check for memory leaks */
+static int dm_test_leak(struct dm_test_state *dms)
+{
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		struct mallinfo start, end;
+		struct device *dev;
+		int ret;
+		int id;
+
+		start = mallinfo();
+		if (!start.uordblks)
+			puts("Warning: Please add '#define DEBUG' to the top of common/dlmalloc.c\n");
+
+		ut_assertok(dm_scan_platdata());
+		ut_assertok(dm_scan_fdt(gd->fdt_blob));
+
+		/* Scanning the uclass is enough to probe all the devices */
+		for (id = UCLASS_ROOT; id < UCLASS_COUNT; id++) {
+			for (ret = uclass_first_device(UCLASS_TEST, &dev);
+			     dev;
+			     ret = uclass_next_device(&dev))
+				;
+			ut_assertok(ret);
+		}
+
+		/* Don't delete the root class, since we started with that */
+		for (id = UCLASS_ROOT + 1; id < UCLASS_COUNT; id++) {
+			struct uclass *uc;
+
+			uc = uclass_find(id);
+			if (!uc)
+				continue;
+			ut_assertok(uclass_destroy(uc));
+		}
+
+		end = mallinfo();
+		ut_asserteq(start.uordblks, end.uordblks);
+	}
+
+	return 0;
+}
+DM_TEST(dm_test_leak, 0);
+
+/* Test uclass init/destroy methods */
+static int dm_test_uclass(struct dm_test_state *dms)
+{
+	struct uclass *uc;
+
+	ut_assertok(uclass_get(UCLASS_TEST, &uc));
+	ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_INIT]);
+	ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_DESTROY]);
+	ut_assert(uc->priv);
+
+	ut_assertok(uclass_destroy(uc));
+	ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_INIT]);
+	ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_DESTROY]);
+
+	return 0;
+}
+DM_TEST(dm_test_uclass, 0);
+
+/**
+ * create_children() - Create children of a parent node
+ *
+ * @dms:	Test system state
+ * @parent:	Parent device
+ * @count:	Number of children to create
+ * @key:	Key value to put in first child. Subsequence children
+ *		receive an incrementing value
+ * @child:	If not NULL, then the child device pointers are written into
+ *		this array.
+ * @return 0 if OK, -ve on error
+ */
+static int create_children(struct dm_test_state *dms, struct device *parent,
+			   int count, int key, struct device *child[])
+{
+	struct device *dev;
+	int i;
+
+	for (i = 0; i < count; i++) {
+		struct dm_test_pdata *pdata;
+
+		ut_assertok(device_bind_by_name(parent, &driver_info_manual,
+						&dev));
+		pdata = calloc(1, sizeof(*pdata));
+		pdata->ping_add = key + i;
+		dev->platdata = pdata;
+		if (child)
+			child[i] = dev;
+	}
+
+	return 0;
+}
+
+#define NODE_COUNT	10
+
+static int dm_test_children(struct dm_test_state *dms)
+{
+	struct device *top[NODE_COUNT];
+	struct device *child[NODE_COUNT];
+	struct device *grandchild[NODE_COUNT];
+	struct device *dev;
+	int total;
+	int ret;
+	int i;
+
+	/* We don't care about the numbering for this test */
+	dms->skip_post_probe = 1;
+
+	ut_assert(NODE_COUNT > 5);
+
+	/* First create 10 top-level children */
+	ut_assertok(create_children(dms, dms->root, NODE_COUNT, 0, top));
+
+	/* Now a few have their own children */
+	ut_assertok(create_children(dms, top[2], NODE_COUNT, 2, NULL));
+	ut_assertok(create_children(dms, top[5], NODE_COUNT, 5, child));
+
+	/* And grandchildren */
+	for (i = 0; i < NODE_COUNT; i++)
+		ut_assertok(create_children(dms, child[i], NODE_COUNT, 50 * i,
+					    i == 2 ? grandchild : NULL));
+
+	/* Check total number of devices */
+	total = NODE_COUNT * (3 + NODE_COUNT);
+	ut_asserteq(total, dm_testdrv_op_count[DM_TEST_OP_BIND]);
+
+	/* Try probing one of the grandchildren */
+	ut_assertok(uclass_get_device(UCLASS_TEST,
+				      NODE_COUNT * 3 + 2 * NODE_COUNT, &dev));
+	ut_asserteq_ptr(grandchild[0], dev);
+
+	/*
+	 * This should have probed the child and top node also, for a total
+	 * of 3 nodes.
+	 */
+	ut_asserteq(3, dm_testdrv_op_count[DM_TEST_OP_PROBE]);
+
+	/* Probe the other grandchildren */
+	for (i = 1; i < NODE_COUNT; i++)
+		ut_assertok(device_probe(grandchild[i]));
+
+	ut_asserteq(2 + NODE_COUNT, dm_testdrv_op_count[DM_TEST_OP_PROBE]);
+
+	/* Probe everything */
+	for (ret = uclass_first_device(UCLASS_TEST, &dev);
+	     dev;
+	     ret = uclass_next_device(&dev))
+		;
+	ut_assertok(ret);
+
+	ut_asserteq(total, dm_testdrv_op_count[DM_TEST_OP_PROBE]);
+
+	/* Remove a top-level child and check that the children are removed */
+	ut_assertok(device_remove(top[2]));
+	ut_asserteq(NODE_COUNT + 1, dm_testdrv_op_count[DM_TEST_OP_REMOVE]);
+	dm_testdrv_op_count[DM_TEST_OP_REMOVE] = 0;
+
+	/* Try one with grandchildren */
+	ut_assertok(uclass_get_device(UCLASS_TEST, 5, &dev));
+	ut_asserteq_ptr(dev, top[5]);
+	ut_assertok(device_remove(dev));
+	ut_asserteq(1 + NODE_COUNT * (1 + NODE_COUNT),
+		    dm_testdrv_op_count[DM_TEST_OP_REMOVE]);
+
+	/* Try the same with unbind */
+	ut_assertok(device_unbind(top[2]));
+	ut_asserteq(NODE_COUNT + 1, dm_testdrv_op_count[DM_TEST_OP_UNBIND]);
+	dm_testdrv_op_count[DM_TEST_OP_UNBIND] = 0;
+
+	/* Try one with grandchildren */
+	ut_assertok(uclass_get_device(UCLASS_TEST, 5, &dev));
+	ut_asserteq_ptr(dev, top[6]);
+	ut_assertok(device_unbind(top[5]));
+	ut_asserteq(1 + NODE_COUNT * (1 + NODE_COUNT),
+		    dm_testdrv_op_count[DM_TEST_OP_UNBIND]);
+
+	return 0;
+}
+DM_TEST(dm_test_children, 0);
diff --git a/test/dm/test-dm.sh b/test/dm/test-dm.sh
new file mode 100755
index 0000000..ef5aca5
--- /dev/null
+++ b/test/dm/test-dm.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+NUM_CPUS=$(cat /proc/cpuinfo |grep -c processor)
+dtc -I dts -O dtb test/dm/test.dts -o test/dm/test.dtb
+make O=sandbox sandbox_config
+make O=sandbox -s -j${NUM_CPUS}
+./sandbox/u-boot -d test/dm/test.dtb -c "dm test"
diff --git a/test/dm/test-driver.c b/test/dm/test-driver.c
new file mode 100644
index 0000000..c4be8a1
--- /dev/null
+++ b/test/dm/test-driver.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <malloc.h>
+#include <dm/test.h>
+#include <dm/ut.h>
+#include <asm/io.h>
+
+int dm_testdrv_op_count[DM_TEST_OP_COUNT];
+static struct dm_test_state *dms = &global_test_state;
+
+static int testdrv_ping(struct device *dev, int pingval, int *pingret)
+{
+	const struct dm_test_pdata *pdata = dev_get_platdata(dev);
+	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 = testdrv_ping,
+};
+
+static int test_bind(struct device *dev)
+{
+	/* Private data should not be allocated */
+	ut_assert(!dev_get_priv(dev));
+
+	dm_testdrv_op_count[DM_TEST_OP_BIND]++;
+	return 0;
+}
+
+static int test_probe(struct device *dev)
+{
+	struct dm_test_priv *priv = dev_get_priv(dev);
+
+	/* Private data should be allocated */
+	ut_assert(priv);
+
+	dm_testdrv_op_count[DM_TEST_OP_PROBE]++;
+	priv->ping_total += DM_TEST_START_TOTAL;
+	return 0;
+}
+
+static int test_remove(struct device *dev)
+{
+	/* Private data should still be allocated */
+	ut_assert(dev_get_priv(dev));
+
+	dm_testdrv_op_count[DM_TEST_OP_REMOVE]++;
+	return 0;
+}
+
+static int test_unbind(struct device *dev)
+{
+	/* Private data should not be allocated */
+	ut_assert(!dev->priv);
+
+	dm_testdrv_op_count[DM_TEST_OP_UNBIND]++;
+	return 0;
+}
+
+U_BOOT_DRIVER(test_drv) = {
+	.name	= "test_drv",
+	.id	= UCLASS_TEST,
+	.ops	= &test_ops,
+	.bind	= test_bind,
+	.probe	= test_probe,
+	.remove	= test_remove,
+	.unbind	= test_unbind,
+	.priv_auto_alloc_size = sizeof(struct dm_test_priv),
+};
+
+U_BOOT_DRIVER(test2_drv) = {
+	.name	= "test2_drv",
+	.id	= UCLASS_TEST,
+	.ops	= &test_ops,
+	.bind	= test_bind,
+	.probe	= test_probe,
+	.remove	= test_remove,
+	.unbind	= test_unbind,
+	.priv_auto_alloc_size = sizeof(struct dm_test_priv),
+};
+
+static int test_manual_drv_ping(struct device *dev, int pingval, int *pingret)
+{
+	*pingret = pingval + 2;
+
+	return 0;
+}
+
+static const struct test_ops test_manual_ops = {
+	.ping = test_manual_drv_ping,
+};
+
+static int test_manual_bind(struct device *dev)
+{
+	dm_testdrv_op_count[DM_TEST_OP_BIND]++;
+
+	return 0;
+}
+
+static int test_manual_probe(struct device *dev)
+{
+	dm_testdrv_op_count[DM_TEST_OP_PROBE]++;
+	if (!dms->force_fail_alloc)
+		dev->priv = calloc(1, sizeof(struct dm_test_priv));
+	if (!dev->priv)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int test_manual_remove(struct device *dev)
+{
+	dm_testdrv_op_count[DM_TEST_OP_REMOVE]++;
+	return 0;
+}
+
+static int test_manual_unbind(struct device *dev)
+{
+	dm_testdrv_op_count[DM_TEST_OP_UNBIND]++;
+	return 0;
+}
+
+U_BOOT_DRIVER(test_manual_drv) = {
+	.name	= "test_manual_drv",
+	.id	= UCLASS_TEST,
+	.ops	= &test_manual_ops,
+	.bind	= test_manual_bind,
+	.probe	= test_manual_probe,
+	.remove	= test_manual_remove,
+	.unbind	= test_manual_unbind,
+};
diff --git a/test/dm/test-fdt.c b/test/dm/test-fdt.c
new file mode 100644
index 0000000..e1d982f
--- /dev/null
+++ b/test/dm/test-fdt.c
@@ -0,0 +1,144 @@
+/*
+ * 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/ut.h>
+#include <dm/uclass-internal.h>
+#include <dm/util.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int testfdt_drv_ping(struct device *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 device *dev)
+{
+	struct dm_test_pdata *pdata = dev_get_platdata(dev);
+
+	pdata->ping_add = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+					"ping-add", -1);
+	pdata->base = fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
+
+	return 0;
+}
+
+static int testfdt_drv_probe(struct device *dev)
+{
+	struct dm_test_priv *priv = dev_get_priv(dev);
+
+	priv->ping_total += DM_TEST_START_TOTAL;
+
+	return 0;
+}
+
+static const struct device_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 device *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,
+};
+
+/* Test that FDT-based binding works correctly */
+static int dm_test_fdt(struct dm_test_state *dms)
+{
+	const int num_drivers = 3;
+	struct device *dev;
+	struct uclass *uc;
+	int ret;
+	int i;
+
+	ret = dm_scan_fdt(gd->fdt_blob);
+	ut_assert(!ret);
+
+	ret = uclass_get(UCLASS_TEST_FDT, &uc);
+	ut_assert(!ret);
+
+	/* These are num_drivers compatible root-level device tree nodes */
+	ut_asserteq(num_drivers, list_count_items(&uc->dev_head));
+
+	/* Each should have no platdata / priv */
+	for (i = 0; i < num_drivers; i++) {
+		ret = uclass_find_device(UCLASS_TEST_FDT, i, &dev);
+		ut_assert(!ret);
+		ut_assert(!dev_get_priv(dev));
+		ut_assert(!dev->platdata);
+	}
+
+	/*
+	 * 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_drivers; i++) {
+		uint32_t base;
+
+		ret = uclass_get_device(UCLASS_TEST_FDT, i, &dev);
+		ut_assert(!ret);
+
+		/*
+		 * Get the 'reg' 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, "reg");
+		debug("dev=%d, base=%d: %s\n", i, base,
+		      fdt_get_name(gd->fdt_blob, dev->of_offset, NULL));
+
+		ut_assert(!dm_check_operations(dms, dev, base,
+					       dev_get_priv(dev)));
+	}
+
+	return 0;
+}
+DM_TEST(dm_test_fdt, 0);
diff --git a/test/dm/test-main.c b/test/dm/test-main.c
new file mode 100644
index 0000000..828ed46
--- /dev/null
+++ b/test/dm/test-main.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <dm/test.h>
+#include <dm/root.h>
+#include <dm/uclass-internal.h>
+#include <dm/ut.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct dm_test_state global_test_state;
+
+/* Get ready for testing */
+static int dm_test_init(struct dm_test_state *dms)
+{
+	memset(dms, '\0', sizeof(*dms));
+	gd->dm_root = NULL;
+	memset(dm_testdrv_op_count, '\0', sizeof(dm_testdrv_op_count));
+
+	ut_assertok(dm_init());
+	dms->root = dm_root();
+
+	return 0;
+}
+
+/* Ensure all the test devices are probed */
+static int do_autoprobe(struct dm_test_state *dms)
+{
+	struct device *dev;
+	int ret;
+
+	/* Scanning the uclass is enough to probe all the devices */
+	for (ret = uclass_first_device(UCLASS_TEST, &dev);
+	     dev;
+	     ret = uclass_next_device(&dev))
+		;
+
+	return ret;
+}
+
+static int dm_test_destroy(struct dm_test_state *dms)
+{
+	int id;
+
+	for (id = 0; id < UCLASS_COUNT; id++) {
+		struct uclass *uc;
+
+		/*
+		 * If the uclass doesn't exist we don't want to create it. So
+		 * check that here before we call uclass_find_device()/
+		 */
+		uc = uclass_find(id);
+		if (!uc)
+			continue;
+		ut_assertok(uclass_destroy(uc));
+	}
+
+	return 0;
+}
+
+int dm_test_main(void)
+{
+	struct dm_test *tests = ll_entry_start(struct dm_test, dm_test);
+	const int n_ents = ll_entry_count(struct dm_test, dm_test);
+	struct dm_test_state *dms = &global_test_state;
+	struct dm_test *test;
+
+	/*
+	 * If we have no device tree, or it only has a root node, then these
+	 * tests clearly aren't going to work...
+	 */
+	if (!gd->fdt_blob || fdt_next_node(gd->fdt_blob, 0, NULL) < 0) {
+		puts("Please run with test device tree:\n"
+		     "     dtc -I dts -O dtb test/dm/test.dts  -o test/dm/test.dtb\n"
+		     "    ./u-boot -d test/dm/test.dtb\n");
+		ut_assert(gd->fdt_blob);
+	}
+
+	printf("Running %d driver model tests\n", n_ents);
+
+	for (test = tests; test < tests + n_ents; test++) {
+		printf("Test: %s\n", test->name);
+		ut_assertok(dm_test_init(dms));
+
+		if (test->flags & DM_TESTF_SCAN_PDATA)
+			ut_assertok(dm_scan_platdata());
+		if (test->flags & DM_TESTF_PROBE_TEST)
+			ut_assertok(do_autoprobe(dms));
+		if (test->flags & DM_TESTF_SCAN_FDT)
+			ut_assertok(dm_scan_fdt(gd->fdt_blob));
+
+		if (test->func(dms))
+			break;
+
+		ut_assertok(dm_test_destroy(dms));
+	}
+
+	printf("Failures: %d\n", dms->fail_count);
+
+	return 0;
+}
diff --git a/test/dm/test-uclass.c b/test/dm/test-uclass.c
new file mode 100644
index 0000000..8b564b8
--- /dev/null
+++ b/test/dm/test-uclass.c
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <dm.h>
+#include <errno.h>
+#include <dm/test.h>
+#include <dm/ut.h>
+#include <asm/io.h>
+#include <linux/list.h>
+
+static struct dm_test_state *dms = &global_test_state;
+
+int test_ping(struct device *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);
+}
+
+static int test_post_bind(struct device *dev)
+{
+	dm_testdrv_op_count[DM_TEST_OP_POST_BIND]++;
+
+	return 0;
+}
+
+static int test_pre_unbind(struct device *dev)
+{
+	dm_testdrv_op_count[DM_TEST_OP_PRE_UNBIND]++;
+
+	return 0;
+}
+
+static int test_post_probe(struct device *dev)
+{
+	struct device *prev = list_entry(dev->uclass_node.prev, struct device,
+					 uclass_node);
+	struct dm_test_uclass_perdev_priv *priv = dev->uclass_priv;
+	struct uclass *uc = dev->uclass;
+
+	dm_testdrv_op_count[DM_TEST_OP_POST_PROBE]++;
+	ut_assert(priv);
+	ut_assert(device_active(dev));
+	priv->base_add = 0;
+	if (dms->skip_post_probe)
+		return 0;
+	if (&prev->uclass_node != &uc->dev_head) {
+		struct dm_test_uclass_perdev_priv *prev_uc_priv
+				= prev->uclass_priv;
+		struct dm_test_pdata *pdata = prev->platdata;
+
+		ut_assert(pdata);
+		ut_assert(prev_uc_priv);
+		priv->base_add = prev_uc_priv->base_add + pdata->ping_add;
+	}
+
+	return 0;
+}
+
+static int test_pre_remove(struct device *dev)
+{
+	dm_testdrv_op_count[DM_TEST_OP_PRE_REMOVE]++;
+
+	return 0;
+}
+
+static int test_init(struct uclass *uc)
+{
+	dm_testdrv_op_count[DM_TEST_OP_INIT]++;
+	ut_assert(uc->priv);
+
+	return 0;
+}
+
+static int test_destroy(struct uclass *uc)
+{
+	dm_testdrv_op_count[DM_TEST_OP_DESTROY]++;
+
+	return 0;
+}
+
+UCLASS_DRIVER(test) = {
+	.name		= "test",
+	.id		= UCLASS_TEST,
+	.post_bind	= test_post_bind,
+	.pre_unbind	= test_pre_unbind,
+	.post_probe	= test_post_probe,
+	.pre_remove	= test_pre_remove,
+	.init		= test_init,
+	.destroy	= test_destroy,
+	.priv_auto_alloc_size	= sizeof(struct dm_test_uclass_priv),
+	.per_device_auto_alloc_size = sizeof(struct dm_test_uclass_perdev_priv),
+};
diff --git a/test/dm/test.dts b/test/dm/test.dts
new file mode 100644
index 0000000..ec5364f
--- /dev/null
+++ b/test/dm/test.dts
@@ -0,0 +1,59 @@
+/dts-v1/;
+
+/ {
+	model = "sandbox";
+	compatible = "sandbox";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	a-test {
+		reg = <0>;
+		compatible = "denx,u-boot-fdt-test";
+		ping-add = <0>;
+	};
+
+	junk {
+		reg = <1>;
+		compatible = "not,compatible";
+	};
+
+	no-compatible {
+		reg = <2>;
+	};
+
+	b-test {
+		reg = <3>;
+		compatible = "denx,u-boot-fdt-test";
+		ping-add = <3>;
+	};
+
+	some-bus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <4>;
+		ping-add = <4>;
+		c-test {
+			compatible = "denx,u-boot-fdt-test";
+			reg = <5>;
+			ping-add = <5>;
+		};
+	};
+
+	d-test {
+		reg = <6>;
+		ping-add = <6>;
+		compatible = "google,another-fdt-test";
+	};
+
+	base-gpios {
+		compatible = "sandbox,gpio";
+		gpio-bank-name = "a";
+		num-gpios = <20>;
+	};
+
+	extra-gpios {
+		compatible = "sandbox,gpio";
+		gpio-bank-name = "b";
+		num-gpios = <10>;
+	};
+};
diff --git a/test/dm/ut.c b/test/dm/ut.c
new file mode 100644
index 0000000..8b69bc2
--- /dev/null
+++ b/test/dm/ut.c
@@ -0,0 +1,33 @@
+/*
+ * Simple unit test library for driver model
+ *
+ * Copyright (c) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm/test.h>
+#include <dm/ut.h>
+
+struct dm_test_state;
+
+void ut_fail(struct dm_test_state *dms, const char *fname, int line,
+	     const char *func, const char *cond)
+{
+	printf("%s:%d, %s(): %s\n", fname, line, func, cond);
+	dms->fail_count++;
+}
+
+void ut_failf(struct dm_test_state *dms, const char *fname, int line,
+	      const char *func, const char *cond, const char *fmt, ...)
+{
+	va_list args;
+
+	printf("%s:%d, %s(): %s: ", fname, line, func, cond);
+	va_start(args, fmt);
+	vprintf(fmt, args);
+	va_end(args);
+	putc('\n');
+	dms->fail_count++;
+}