1 files changed, 456 insertions, 297 deletions

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index d58ade170c4..500436f9be7 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -13,393 +13,552 @@
  */
 #include <linux/errno.h>
 #include <linux/module.h>
+#include <linux/amba/bus.h>
 #include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/of_address.h>
 #include <linux/of_device.h>
+#include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+const struct of_device_id of_default_bus_match_table[] = {
+	{ .compatible = "simple-bus", },
+#ifdef CONFIG_ARM_AMBA
+	{ .compatible = "arm,amba-bus", },
+#endif /* CONFIG_ARM_AMBA */
+	{} /* Empty terminated list */
+};
 
-extern struct device_attribute of_platform_device_attrs[];
-
-static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
+static int of_dev_node_match(struct device *dev, void *data)
 {
-	struct of_device *of_dev = to_of_device(dev);
-	struct of_platform_driver *of_drv = to_of_platform_driver(drv);
-	const struct of_device_id *matches = of_drv->match_table;
-
-	if (!matches)
-		return 0;
-
-	return of_match_device(matches, of_dev) != NULL;
+	return dev->of_node == data;
 }
 
-static int of_platform_device_probe(struct device *dev)
+/**
+ * of_find_device_by_node - Find the platform_device associated with a node
+ * @np: Pointer to device tree node
+ *
+ * Returns platform_device pointer, or NULL if not found
+ */
+struct platform_device *of_find_device_by_node(struct device_node *np)
 {
-	int error = -ENODEV;
-	struct of_platform_driver *drv;
-	struct of_device *of_dev;
-	const struct of_device_id *match;
+	struct device *dev;
 
-	drv = to_of_platform_driver(dev->driver);
-	of_dev = to_of_device(dev);
-
-	if (!drv->probe)
-		return error;
-
-	of_dev_get(of_dev);
-
-	match = of_match_device(drv->match_table, of_dev);
-	if (match)
-		error = drv->probe(of_dev, match);
-	if (error)
-		of_dev_put(of_dev);
-
-	return error;
+	dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
+	return dev ? to_platform_device(dev) : NULL;
 }
+EXPORT_SYMBOL(of_find_device_by_node);
 
-static int of_platform_device_remove(struct device *dev)
-{
-	struct of_device *of_dev = to_of_device(dev);
-	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
-
-	if (dev->driver && drv->remove)
-		drv->remove(of_dev);
-	return 0;
-}
+#ifdef CONFIG_OF_ADDRESS
+/*
+ * The following routines scan a subtree and registers a device for
+ * each applicable node.
+ *
+ * Note: sparc doesn't use these routines because it has a different
+ * mechanism for creating devices from device tree nodes.
+ */
 
-static void of_platform_device_shutdown(struct device *dev)
+/**
+ * of_device_make_bus_id - Use the device node data to assign a unique name
+ * @dev: pointer to device structure that is linked to a device tree node
+ *
+ * This routine will first try using the translated bus address to
+ * derive a unique name. If it cannot, then it will prepend names from
+ * parent nodes until a unique name can be derived.
+ */
+void of_device_make_bus_id(struct device *dev)
 {
-	struct of_device *of_dev = to_of_device(dev);
-	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
-
-	if (dev->driver && drv->shutdown)
-		drv->shutdown(of_dev);
+	struct device_node *node = dev->of_node;
+	const __be32 *reg;
+	u64 addr;
+
+	/* Construct the name, using parent nodes if necessary to ensure uniqueness */
+	while (node->parent) {
+		/*
+		 * If the address can be translated, then that is as much
+		 * uniqueness as we need. Make it the first component and return
+		 */
+		reg = of_get_property(node, "reg", NULL);
+		if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
+			dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s",
+				     (unsigned long long)addr, node->name,
+				     dev_name(dev));
+			return;
+		}
+
+		/* format arguments only used if dev_name() resolves to NULL */
+		dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
+			     strrchr(node->full_name, '/') + 1, dev_name(dev));
+		node = node->parent;
+	}
 }
 
-#ifdef CONFIG_PM_SLEEP
-
-static int of_platform_legacy_suspend(struct device *dev, pm_message_t mesg)
+/**
+ * of_device_alloc - Allocate and initialize an of_device
+ * @np: device node to assign to device
+ * @bus_id: Name to assign to the device.  May be null to use default name.
+ * @parent: Parent device.
+ */
+struct platform_device *of_device_alloc(struct device_node *np,
+				  const char *bus_id,
+				  struct device *parent)
 {
-	struct of_device *of_dev = to_of_device(dev);
-	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
-	int ret = 0;
+	struct platform_device *dev;
+	int rc, i, num_reg = 0, num_irq;
+	struct resource *res, temp_res;
+
+	dev = platform_device_alloc("", -1);
+	if (!dev)
+		return NULL;
+
+	/* count the io and irq resources */
+	while (of_address_to_resource(np, num_reg, &temp_res) == 0)
+		num_reg++;
+	num_irq = of_irq_count(np);
+
+	/* Populate the resource table */
+	if (num_irq || num_reg) {
+		res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL);
+		if (!res) {
+			platform_device_put(dev);
+			return NULL;
+		}
+
+		dev->num_resources = num_reg + num_irq;
+		dev->resource = res;
+		for (i = 0; i < num_reg; i++, res++) {
+			rc = of_address_to_resource(np, i, res);
+			WARN_ON(rc);
+		}
+		if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
+			pr_debug("not all legacy IRQ resources mapped for %s\n",
+				 np->name);
+	}
 
-	if (dev->driver && drv->suspend)
-		ret = drv->suspend(of_dev, mesg);
-	return ret;
-}
+	dev->dev.of_node = of_node_get(np);
+	dev->dev.parent = parent;
 
-static int of_platform_legacy_resume(struct device *dev)
-{
-	struct of_device *of_dev = to_of_device(dev);
-	struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
-	int ret = 0;
+	if (bus_id)
+		dev_set_name(&dev->dev, "%s", bus_id);
+	else
+		of_device_make_bus_id(&dev->dev);
 
-	if (dev->driver && drv->resume)
-		ret = drv->resume(of_dev);
-	return ret;
+	return dev;
 }
+EXPORT_SYMBOL(of_device_alloc);
 
-static int of_platform_pm_prepare(struct device *dev)
+/**
+ * of_dma_configure - Setup DMA configuration
+ * @dev:	Device to apply DMA configuration
+ *
+ * Try to get devices's DMA configuration from DT and update it
+ * accordingly.
+ *
+ * In case if platform code need to use own special DMA configuration,it
+ * can use Platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE event
+ * to fix up DMA configuration.
+ */
+static void of_dma_configure(struct platform_device *pdev)
 {
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
+	u64 dma_addr, paddr, size;
+	int ret;
+	struct device *dev = &pdev->dev;
+
+	/*
+	 * Set default dma-mask to 32 bit. Drivers are expected to setup
+	 * the correct supported dma_mask.
+	 */
+	dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+	/*
+	 * Set it to coherent_dma_mask by default if the architecture
+	 * code has not set it.
+	 */
+	if (!dev->dma_mask)
+		dev->dma_mask = &dev->coherent_dma_mask;
+
+	/*
+	 * if dma-coherent property exist, call arch hook to setup
+	 * dma coherent operations.
+	 */
+	if (of_dma_is_coherent(dev->of_node)) {
+		set_arch_dma_coherent_ops(dev);
+		dev_dbg(dev, "device is dma coherent\n");
+	}
 
-	if (drv && drv->pm && drv->pm->prepare)
-		ret = drv->pm->prepare(dev);
+	/*
+	 * if dma-ranges property doesn't exist - just return else
+	 * setup the dma offset
+	 */
+	ret = of_dma_get_range(dev->of_node, &dma_addr, &paddr, &size);
+	if (ret < 0) {
+		dev_dbg(dev, "no dma range information to setup\n");
+		return;
+	}
 
-	return ret;
+	/* DMA ranges found. Calculate and set dma_pfn_offset */
+	dev->dma_pfn_offset = PFN_DOWN(paddr - dma_addr);
+	dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", dev->dma_pfn_offset);
 }
 
-static void of_platform_pm_complete(struct device *dev)
+/**
+ * of_platform_device_create_pdata - Alloc, initialize and register an of_device
+ * @np: pointer to node to create device for
+ * @bus_id: name to assign device
+ * @platform_data: pointer to populate platform_data pointer with
+ * @parent: Linux device model parent device.
+ *
+ * Returns pointer to created platform device, or NULL if a device was not
+ * registered.  Unavailable devices will not get registered.
+ */
+static struct platform_device *of_platform_device_create_pdata(
+					struct device_node *np,
+					const char *bus_id,
+					void *platform_data,
+					struct device *parent)
 {
-	struct device_driver *drv = dev->driver;
+	struct platform_device *dev;
 
-	if (drv && drv->pm && drv->pm->complete)
-		drv->pm->complete(dev);
-}
+	if (!of_device_is_available(np) ||
+	    of_node_test_and_set_flag(np, OF_POPULATED))
+		return NULL;
 
-#ifdef CONFIG_SUSPEND
+	dev = of_device_alloc(np, bus_id, parent);
+	if (!dev)
+		goto err_clear_flag;
 
-static int of_platform_pm_suspend(struct device *dev)
-{
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
+	of_dma_configure(dev);
+	dev->dev.bus = &platform_bus_type;
+	dev->dev.platform_data = platform_data;
 
-	if (!drv)
-		return 0;
+	/* We do not fill the DMA ops for platform devices by default.
+	 * This is currently the responsibility of the platform code
+	 * to do such, possibly using a device notifier
+	 */
 
-	if (drv->pm) {
-		if (drv->pm->suspend)
-			ret = drv->pm->suspend(dev);
-	} else {
-		ret = of_platform_legacy_suspend(dev, PMSG_SUSPEND);
+	if (of_device_add(dev) != 0) {
+		platform_device_put(dev);
+		goto err_clear_flag;
 	}
 
-	return ret;
-}
-
-static int of_platform_pm_suspend_noirq(struct device *dev)
-{
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
-
-	if (!drv)
-		return 0;
-
-	if (drv->pm) {
-		if (drv->pm->suspend_noirq)
-			ret = drv->pm->suspend_noirq(dev);
-	}
+	return dev;
 
-	return ret;
+err_clear_flag:
+	of_node_clear_flag(np, OF_POPULATED);
+	return NULL;
 }
 
-static int of_platform_pm_resume(struct device *dev)
+/**
+ * of_platform_device_create - Alloc, initialize and register an of_device
+ * @np: pointer to node to create device for
+ * @bus_id: name to assign device
+ * @parent: Linux device model parent device.
+ *
+ * Returns pointer to created platform device, or NULL if a device was not
+ * registered.  Unavailable devices will not get registered.
+ */
+struct platform_device *of_platform_device_create(struct device_node *np,
+					    const char *bus_id,
+					    struct device *parent)
 {
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
-
-	if (!drv)
-		return 0;
-
-	if (drv->pm) {
-		if (drv->pm->resume)
-			ret = drv->pm->resume(dev);
-	} else {
-		ret = of_platform_legacy_resume(dev);
-	}
-
-	return ret;
+	return of_platform_device_create_pdata(np, bus_id, NULL, parent);
 }
+EXPORT_SYMBOL(of_platform_device_create);
 
-static int of_platform_pm_resume_noirq(struct device *dev)
+#ifdef CONFIG_ARM_AMBA
+static struct amba_device *of_amba_device_create(struct device_node *node,
+						 const char *bus_id,
+						 void *platform_data,
+						 struct device *parent)
 {
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
+	struct amba_device *dev;
+	const void *prop;
+	int i, ret;
 
-	if (!drv)
-		return 0;
+	pr_debug("Creating amba device %s\n", node->full_name);
 
-	if (drv->pm) {
-		if (drv->pm->resume_noirq)
-			ret = drv->pm->resume_noirq(dev);
-	}
+	if (!of_device_is_available(node) ||
+	    of_node_test_and_set_flag(node, OF_POPULATED))
+		return NULL;
 
-	return ret;
-}
-
-#else /* !CONFIG_SUSPEND */
+	dev = amba_device_alloc(NULL, 0, 0);
+	if (!dev) {
+		pr_err("%s(): amba_device_alloc() failed for %s\n",
+		       __func__, node->full_name);
+		goto err_clear_flag;
+	}
 
-#define of_platform_pm_suspend		NULL
-#define of_platform_pm_resume		NULL
-#define of_platform_pm_suspend_noirq	NULL
-#define of_platform_pm_resume_noirq	NULL
+	/* setup generic device info */
+	dev->dev.coherent_dma_mask = ~0;
+	dev->dev.of_node = of_node_get(node);
+	dev->dev.parent = parent;
+	dev->dev.platform_data = platform_data;
+	if (bus_id)
+		dev_set_name(&dev->dev, "%s", bus_id);
+	else
+		of_device_make_bus_id(&dev->dev);
+
+	/* Allow the HW Peripheral ID to be overridden */
+	prop = of_get_property(node, "arm,primecell-periphid", NULL);
+	if (prop)
+		dev->periphid = of_read_ulong(prop, 1);
+
+	/* Decode the IRQs and address ranges */
+	for (i = 0; i < AMBA_NR_IRQS; i++)
+		dev->irq[i] = irq_of_parse_and_map(node, i);
+
+	ret = of_address_to_resource(node, 0, &dev->res);
+	if (ret) {
+		pr_err("%s(): of_address_to_resource() failed (%d) for %s\n",
+		       __func__, ret, node->full_name);
+		goto err_free;
+	}
 
-#endif /* !CONFIG_SUSPEND */
+	ret = amba_device_add(dev, &iomem_resource);
+	if (ret) {
+		pr_err("%s(): amba_device_add() failed (%d) for %s\n",
+		       __func__, ret, node->full_name);
+		goto err_free;
+	}
 
-#ifdef CONFIG_HIBERNATION
+	return dev;
 
-static int of_platform_pm_freeze(struct device *dev)
+err_free:
+	amba_device_put(dev);
+err_clear_flag:
+	of_node_clear_flag(node, OF_POPULATED);
+	return NULL;
+}
+#else /* CONFIG_ARM_AMBA */
+static struct amba_device *of_amba_device_create(struct device_node *node,
+						 const char *bus_id,
+						 void *platform_data,
+						 struct device *parent)
 {
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
-
-	if (!drv)
-		return 0;
-
-	if (drv->pm) {
-		if (drv->pm->freeze)
-			ret = drv->pm->freeze(dev);
-	} else {
-		ret = of_platform_legacy_suspend(dev, PMSG_FREEZE);
-	}
-
-	return ret;
+	return NULL;
 }
+#endif /* CONFIG_ARM_AMBA */
 
-static int of_platform_pm_freeze_noirq(struct device *dev)
+/**
+ * of_devname_lookup() - Given a device node, lookup the preferred Linux name
+ */
+static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
+				 struct device_node *np)
 {
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
-
-	if (!drv)
-		return 0;
-
-	if (drv->pm) {
-		if (drv->pm->freeze_noirq)
-			ret = drv->pm->freeze_noirq(dev);
+	struct resource res;
+
+	if (!lookup)
+		return NULL;
+
+	for(; lookup->compatible != NULL; lookup++) {
+		if (!of_device_is_compatible(np, lookup->compatible))
+			continue;
+		if (!of_address_to_resource(np, 0, &res))
+			if (res.start != lookup->phys_addr)
+				continue;
+		pr_debug("%s: devname=%s\n", np->full_name, lookup->name);
+		return lookup;
 	}
 
-	return ret;
+	return NULL;
 }
 
-static int of_platform_pm_thaw(struct device *dev)
+/**
+ * of_platform_bus_create() - Create a device for a node and its children.
+ * @bus: device node of the bus to instantiate
+ * @matches: match table for bus nodes
+ * @lookup: auxdata table for matching id and platform_data with device nodes
+ * @parent: parent for new device, or NULL for top level.
+ * @strict: require compatible property
+ *
+ * Creates a platform_device for the provided device_node, and optionally
+ * recursively create devices for all the child nodes.
+ */
+static int of_platform_bus_create(struct device_node *bus,
+				  const struct of_device_id *matches,
+				  const struct of_dev_auxdata *lookup,
+				  struct device *parent, bool strict)
 {
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
-
-	if (!drv)
+	const struct of_dev_auxdata *auxdata;
+	struct device_node *child;
+	struct platform_device *dev;
+	const char *bus_id = NULL;
+	void *platform_data = NULL;
+	int rc = 0;
+
+	/* Make sure it has a compatible property */
+	if (strict && (!of_get_property(bus, "compatible", NULL))) {
+		pr_debug("%s() - skipping %s, no compatible prop\n",
+			 __func__, bus->full_name);
 		return 0;
-
-	if (drv->pm) {
-		if (drv->pm->thaw)
-			ret = drv->pm->thaw(dev);
-	} else {
-		ret = of_platform_legacy_resume(dev);
 	}
 
-	return ret;
-}
-
-static int of_platform_pm_thaw_noirq(struct device *dev)
-{
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
+	auxdata = of_dev_lookup(lookup, bus);
+	if (auxdata) {
+		bus_id = auxdata->name;
+		platform_data = auxdata->platform_data;
+	}
 
-	if (!drv)
+	if (of_device_is_compatible(bus, "arm,primecell")) {
+		/*
+		 * Don't return an error here to keep compatibility with older
+		 * device tree files.
+		 */
+		of_amba_device_create(bus, bus_id, platform_data, parent);
 		return 0;
-
-	if (drv->pm) {
-		if (drv->pm->thaw_noirq)
-			ret = drv->pm->thaw_noirq(dev);
 	}
 
-	return ret;
-}
-
-static int of_platform_pm_poweroff(struct device *dev)
-{
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
-
-	if (!drv)
+	dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
+	if (!dev || !of_match_node(matches, bus))
 		return 0;
 
-	if (drv->pm) {
-		if (drv->pm->poweroff)
-			ret = drv->pm->poweroff(dev);
-	} else {
-		ret = of_platform_legacy_suspend(dev, PMSG_HIBERNATE);
+	for_each_child_of_node(bus, child) {
+		pr_debug("   create child: %s\n", child->full_name);
+		rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
+		if (rc) {
+			of_node_put(child);
+			break;
+		}
 	}
-
-	return ret;
+	return rc;
 }
 
-static int of_platform_pm_poweroff_noirq(struct device *dev)
+/**
+ * of_platform_bus_probe() - Probe the device-tree for platform buses
+ * @root: parent of the first level to probe or NULL for the root of the tree
+ * @matches: match table for bus nodes
+ * @parent: parent to hook devices from, NULL for toplevel
+ *
+ * Note that children of the provided root are not instantiated as devices
+ * unless the specified root itself matches the bus list and is not NULL.
+ */
+int of_platform_bus_probe(struct device_node *root,
+			  const struct of_device_id *matches,
+			  struct device *parent)
 {
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
-
-	if (!drv)
-		return 0;
-
-	if (drv->pm) {
-		if (drv->pm->poweroff_noirq)
-			ret = drv->pm->poweroff_noirq(dev);
+	struct device_node *child;
+	int rc = 0;
+
+	root = root ? of_node_get(root) : of_find_node_by_path("/");
+	if (!root)
+		return -EINVAL;
+
+	pr_debug("of_platform_bus_probe()\n");
+	pr_debug(" starting at: %s\n", root->full_name);
+
+	/* Do a self check of bus type, if there's a match, create children */
+	if (of_match_node(matches, root)) {
+		rc = of_platform_bus_create(root, matches, NULL, parent, false);
+	} else for_each_child_of_node(root, child) {
+		if (!of_match_node(matches, child))
+			continue;
+		rc = of_platform_bus_create(child, matches, NULL, parent, false);
+		if (rc)
+			break;
 	}
 
-	return ret;
+	of_node_put(root);
+	return rc;
 }
-
-static int of_platform_pm_restore(struct device *dev)
+EXPORT_SYMBOL(of_platform_bus_probe);
+
+/**
+ * of_platform_populate() - Populate platform_devices from device tree data
+ * @root: parent of the first level to probe or NULL for the root of the tree
+ * @matches: match table, NULL to use the default
+ * @lookup: auxdata table for matching id and platform_data with device nodes
+ * @parent: parent to hook devices from, NULL for toplevel
+ *
+ * Similar to of_platform_bus_probe(), this function walks the device tree
+ * and creates devices from nodes.  It differs in that it follows the modern
+ * convention of requiring all device nodes to have a 'compatible' property,
+ * and it is suitable for creating devices which are children of the root
+ * node (of_platform_bus_probe will only create children of the root which
+ * are selected by the @matches argument).
+ *
+ * New board support should be using this function instead of
+ * of_platform_bus_probe().
+ *
+ * Returns 0 on success, < 0 on failure.
+ */
+int of_platform_populate(struct device_node *root,
+			const struct of_device_id *matches,
+			const struct of_dev_auxdata *lookup,
+			struct device *parent)
 {
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
+	struct device_node *child;
+	int rc = 0;
 
-	if (!drv)
-		return 0;
+	root = root ? of_node_get(root) : of_find_node_by_path("/");
+	if (!root)
+		return -EINVAL;
 
-	if (drv->pm) {
-		if (drv->pm->restore)
-			ret = drv->pm->restore(dev);
-	} else {
-		ret = of_platform_legacy_resume(dev);
+	for_each_child_of_node(root, child) {
+		rc = of_platform_bus_create(child, matches, lookup, parent, true);
+		if (rc)
+			break;
 	}
 
-	return ret;
+	of_node_put(root);
+	return rc;
 }
+EXPORT_SYMBOL_GPL(of_platform_populate);
 
-static int of_platform_pm_restore_noirq(struct device *dev)
+static int of_platform_device_destroy(struct device *dev, void *data)
 {
-	struct device_driver *drv = dev->driver;
-	int ret = 0;
+	bool *children_left = data;
 
-	if (!drv)
+	/* Do not touch devices not populated from the device tree */
+	if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) {
+		*children_left = true;
 		return 0;
-
-	if (drv->pm) {
-		if (drv->pm->restore_noirq)
-			ret = drv->pm->restore_noirq(dev);
 	}
 
-	return ret;
-}
-
-#else /* !CONFIG_HIBERNATION */
-
-#define of_platform_pm_freeze		NULL
-#define of_platform_pm_thaw		NULL
-#define of_platform_pm_poweroff		NULL
-#define of_platform_pm_restore		NULL
-#define of_platform_pm_freeze_noirq	NULL
-#define of_platform_pm_thaw_noirq		NULL
-#define of_platform_pm_poweroff_noirq	NULL
-#define of_platform_pm_restore_noirq	NULL
-
-#endif /* !CONFIG_HIBERNATION */
-
-static struct dev_pm_ops of_platform_dev_pm_ops = {
-	.prepare = of_platform_pm_prepare,
-	.complete = of_platform_pm_complete,
-	.suspend = of_platform_pm_suspend,
-	.resume = of_platform_pm_resume,
-	.freeze = of_platform_pm_freeze,
-	.thaw = of_platform_pm_thaw,
-	.poweroff = of_platform_pm_poweroff,
-	.restore = of_platform_pm_restore,
-	.suspend_noirq = of_platform_pm_suspend_noirq,
-	.resume_noirq = of_platform_pm_resume_noirq,
-	.freeze_noirq = of_platform_pm_freeze_noirq,
-	.thaw_noirq = of_platform_pm_thaw_noirq,
-	.poweroff_noirq = of_platform_pm_poweroff_noirq,
-	.restore_noirq = of_platform_pm_restore_noirq,
-};
-
-#define OF_PLATFORM_PM_OPS_PTR	(&of_platform_dev_pm_ops)
-
-#else /* !CONFIG_PM_SLEEP */
+	/* Recurse, but don't touch this device if it has any children left */
+	if (of_platform_depopulate(dev) != 0) {
+		*children_left = true;
+		return 0;
+	}
 
-#define OF_PLATFORM_PM_OPS_PTR	NULL
+	if (dev->bus == &platform_bus_type)
+		platform_device_unregister(to_platform_device(dev));
+#ifdef CONFIG_ARM_AMBA
+	else if (dev->bus == &amba_bustype)
+		amba_device_unregister(to_amba_device(dev));
+#endif
+	else {
+		*children_left = true;
+		return 0;
+	}
 
-#endif /* !CONFIG_PM_SLEEP */
+	of_node_clear_flag(dev->of_node, OF_POPULATED);
 
-int of_bus_type_init(struct bus_type *bus, const char *name)
-{
-	bus->name = name;
-	bus->match = of_platform_bus_match;
-	bus->probe = of_platform_device_probe;
-	bus->remove = of_platform_device_remove;
-	bus->shutdown = of_platform_device_shutdown;
-	bus->dev_attrs = of_platform_device_attrs;
-	bus->pm = OF_PLATFORM_PM_OPS_PTR;
-	return bus_register(bus);
+	return 0;
 }
 
-int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
+/**
+ * of_platform_depopulate() - Remove devices populated from device tree
+ * @parent: device which childred will be removed
+ *
+ * Complementary to of_platform_populate(), this function removes children
+ * of the given device (and, recurrently, their children) that have been
+ * created from their respective device tree nodes (and only those,
+ * leaving others - eg. manually created - unharmed).
+ *
+ * Returns 0 when all children devices have been removed or
+ * -EBUSY when some children remained.
+ */
+int of_platform_depopulate(struct device *parent)
 {
-	/* initialize common driver fields */
-	if (!drv->driver.name)
-		drv->driver.name = drv->name;
-	if (!drv->driver.owner)
-		drv->driver.owner = drv->owner;
-	drv->driver.bus = bus;
-
-	/* register with core */
-	return driver_register(&drv->driver);
-}
-EXPORT_SYMBOL(of_register_driver);
+	bool children_left = false;
 
-void of_unregister_driver(struct of_platform_driver *drv)
-{
-	driver_unregister(&drv->driver);
+	device_for_each_child(parent, &children_left,
+			      of_platform_device_destroy);
+
+	return children_left ? -EBUSY : 0;
 }
-EXPORT_SYMBOL(of_unregister_driver);
+EXPORT_SYMBOL_GPL(of_platform_depopulate);
+
+#endif /* CONFIG_OF_ADDRESS */