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>

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),
+};