drivers/core/root.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (c) 2013 Google, Inc
  *
  * (C) Copyright 2012
  * Pavel Herrmann <morpheus.ibis@gmail.com>
  */

 #define LOG_CATEGORY UCLASS_ROOT

 #include <common.h>
 #include <errno.h>
 #include <fdtdec.h>
 #include <log.h>
 #include <malloc.h>
 #include <asm-generic/sections.h>
 #include <asm/global_data.h>
 #include <linux/libfdt.h>
 #include <dm/acpi.h>
 #include <dm/device.h>
 #include <dm/device-internal.h>
 #include <dm/lists.h>
 #include <dm/of.h>
 #include <dm/of_access.h>
 #include <dm/platdata.h>
 #include <dm/read.h>
 #include <dm/root.h>
 #include <dm/uclass.h>
 #include <dm/uclass-internal.h>
 #include <dm/util.h>
 #include <linux/list.h>
 #include <linux/printk.h>

 DECLARE_GLOBAL_DATA_PTR;

 static struct driver_info root_info = {
 	.name		= "root_driver",
 };

 struct udevice *dm_root(void)
 {
 	if (!gd->dm_root) {
 		dm_warn("Virtual root driver does not exist!\n");
 		return NULL;
 	}

 	return gd->dm_root;
 }

 void dm_fixup_for_gd_move(struct global_data *new_gd)
 {
 	/* The sentinel node has moved, so update things that point to it */
 	if (gd->dm_root) {
 		new_gd->uclass_root->next->prev = new_gd->uclass_root;
 		new_gd->uclass_root->prev->next = new_gd->uclass_root;
 	}
 }

 static int dm_setup_inst(void)
 {
 	DM_ROOT_NON_CONST = DM_DEVICE_GET(root);

 	if (CONFIG_IS_ENABLED(OF_PLATDATA_RT)) {
 		struct udevice_rt *urt;
 		void *start, *end;
 		int each_size;
 		void *base;
 		int n_ents;
 		uint size;

 		/* Allocate the udevice_rt table */
 		each_size = dm_udevice_size();
 		start = ll_entry_start(struct udevice, udevice);
 		end = ll_entry_end(struct udevice, udevice);
 		size = end - start;
 		n_ents = size / each_size;
 		urt = calloc(n_ents, sizeof(struct udevice_rt));
 		if (!urt)
 			return log_msg_ret("urt", -ENOMEM);
 		gd_set_dm_udevice_rt(urt);

 		/* Now allocate space for the priv/plat data, and copy it in */
 		size = __priv_data_end - __priv_data_start;

 		base = calloc(1, size);
 		if (!base)
 			return log_msg_ret("priv", -ENOMEM);
 		memcpy(base, __priv_data_start, size);
 		gd_set_dm_priv_base(base);
 	}

 	return 0;
 }

 int dm_init(bool of_live)
 {
 	int ret;

 	if (gd->dm_root) {
 		dm_warn("Virtual root driver already exists!\n");
 		return -EINVAL;
 	}
 	if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
 		gd->uclass_root = &uclass_head;
 	} else {
 		gd->uclass_root = &DM_UCLASS_ROOT_S_NON_CONST;
 		INIT_LIST_HEAD(DM_UCLASS_ROOT_NON_CONST);
 	}

 	if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
 		ret = dm_setup_inst();
 		if (ret) {
 			log_debug("dm_setup_inst() failed: %d\n", ret);
 			return ret;
 		}
 	} else {
 		ret = device_bind_by_name(NULL, false, &root_info,
 					  &DM_ROOT_NON_CONST);
 		if (ret)
 			return ret;
 		if (CONFIG_IS_ENABLED(OF_CONTROL))
 			dev_set_ofnode(DM_ROOT_NON_CONST, ofnode_root());
 		ret = device_probe(DM_ROOT_NON_CONST);
 		if (ret)
 			return ret;
 	}

 	INIT_LIST_HEAD((struct list_head *)&gd->dmtag_list);

 	return 0;
 }

 int dm_uninit(void)
 {
 	/* Remove non-vital devices first */
 	device_remove(dm_root(), DM_REMOVE_NON_VITAL);
 	device_remove(dm_root(), DM_REMOVE_NORMAL);
 	device_unbind(dm_root());
 	gd->dm_root = NULL;

 	return 0;
 }

 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
 int dm_remove_devices_flags(uint flags)
 {
 	device_remove(dm_root(), flags);

 	return 0;
 }
 #endif

 int dm_scan_plat(bool pre_reloc_only)
 {
 	int ret;

 	if (CONFIG_IS_ENABLED(OF_PLATDATA_DRIVER_RT)) {
 		struct driver_rt *dyn;
 		int n_ents;

 		n_ents = ll_entry_count(struct driver_info, driver_info);
 		dyn = calloc(n_ents, sizeof(struct driver_rt));
 		if (!dyn)
 			return -ENOMEM;
 		gd_set_dm_driver_rt(dyn);
 	}

 	ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
 	if (ret == -ENOENT) {
 		dm_warn("Some drivers were not found\n");
 		ret = 0;
 	}

 	return ret;
 }

 #if CONFIG_IS_ENABLED(OF_REAL)
 /**
  * dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
  *
  * This scans the subnodes of a device tree node and and creates a driver
  * for each one.
  *
  * @parent: Parent device for the devices that will be created
  * @node: Node to scan
  * @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
  * flag. If false bind all drivers.
  * Return: 0 if OK, -ve on error
  */
 static int dm_scan_fdt_node(struct udevice *parent, ofnode parent_node,
 			    bool pre_reloc_only)
 {
 	int ret = 0, err = 0;
 	ofnode node;

 	if (!ofnode_valid(parent_node))
 		return 0;

 	for (node = ofnode_first_subnode(parent_node);
 	     ofnode_valid(node);
 	     node = ofnode_next_subnode(node)) {
 		const char *node_name = ofnode_get_name(node);

 		if (!ofnode_is_enabled(node)) {
 			pr_debug("   - ignoring disabled device\n");
 			continue;
 		}
 		err = lists_bind_fdt(parent, node, NULL, NULL, pre_reloc_only);
 		if (err && !ret) {
 			ret = err;
 			debug("%s: ret=%d\n", node_name, ret);
 		}
 	}

 	if (ret)
 		dm_warn("Some drivers failed to bind\n");

 	return ret;
 }

 int dm_scan_fdt_dev(struct udevice *dev)
 {
 	return dm_scan_fdt_node(dev, dev_ofnode(dev),
 				gd->flags & GD_FLG_RELOC ? false : true);
 }

 int dm_scan_fdt(bool pre_reloc_only)
 {
 	return dm_scan_fdt_node(gd->dm_root, ofnode_root(), pre_reloc_only);
 }

 static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
 {
 	ofnode node;

 	node = ofnode_path(path);

 	return dm_scan_fdt_node(gd->dm_root, node, pre_reloc_only);
 }

 int dm_extended_scan(bool pre_reloc_only)
 {
 	int ret, i;
 	const char * const nodes[] = {
 		"/chosen",
 		"/clocks",
 		"/firmware"
 	};

 	ret = dm_scan_fdt(pre_reloc_only);
 	if (ret) {
 		debug("dm_scan_fdt() failed: %d\n", ret);
 		return ret;
 	}

 	/* Some nodes aren't devices themselves but may contain some */
 	for (i = 0; i < ARRAY_SIZE(nodes); i++) {
 		ret = dm_scan_fdt_ofnode_path(nodes[i], pre_reloc_only);
 		if (ret) {
 			debug("dm_scan_fdt() scan for %s failed: %d\n",
 			      nodes[i], ret);
 			return ret;
 		}
 	}

 	return ret;
 }
 #endif

 __weak int dm_scan_other(bool pre_reloc_only)
 {
 	return 0;
 }

 #if CONFIG_IS_ENABLED(OF_PLATDATA_INST) && CONFIG_IS_ENABLED(READ_ONLY)
 void *dm_priv_to_rw(void *priv)
 {
 	long offset = priv - (void *)__priv_data_start;

 	return gd_dm_priv_base() + offset;
 }
 #endif

 static int dm_probe_devices(struct udevice *dev, bool pre_reloc_only)
 {
 	ofnode node = dev_ofnode(dev);
 	struct udevice *child;
 	int ret;

 	if (pre_reloc_only &&
 	    (!ofnode_valid(node) || !ofnode_pre_reloc(node)) &&
 	    !(dev->driver->flags & DM_FLAG_PRE_RELOC))
 		goto probe_children;

 	if (dev_get_flags(dev) & DM_FLAG_PROBE_AFTER_BIND) {
 		ret = device_probe(dev);
 		if (ret)
 			return ret;
 	}

 probe_children:
 	list_for_each_entry(child, &dev->child_head, sibling_node)
 		dm_probe_devices(child, pre_reloc_only);

 	return 0;
 }

 /**
  * dm_scan() - Scan tables to bind devices
  *
  * Runs through the driver_info tables and binds the devices it finds. Then runs
  * through the devicetree nodes. Finally calls dm_scan_other() to add any
  * special devices
  *
  * @pre_reloc_only: If true, bind only nodes with special devicetree properties,
  * or drivers with the DM_FLAG_PRE_RELOC flag. If false bind all drivers.
  */
 static int dm_scan(bool pre_reloc_only)
 {
 	int ret;

 	ret = dm_scan_plat(pre_reloc_only);
 	if (ret) {
 		debug("dm_scan_plat() failed: %d\n", ret);
 		return ret;
 	}

 	if (CONFIG_IS_ENABLED(OF_REAL)) {
 		ret = dm_extended_scan(pre_reloc_only);
 		if (ret) {
 			debug("dm_extended_scan() failed: %d\n", ret);
 			return ret;
 		}
 	}

 	ret = dm_scan_other(pre_reloc_only);
 	if (ret)
 		return ret;

 	return dm_probe_devices(gd->dm_root, pre_reloc_only);
 }

 int dm_init_and_scan(bool pre_reloc_only)
 {
 	int ret;

 	ret = dm_init(CONFIG_IS_ENABLED(OF_LIVE));
 	if (ret) {
 		debug("dm_init() failed: %d\n", ret);
 		return ret;
 	}
 	if (!CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
 		ret = dm_scan(pre_reloc_only);
 		if (ret) {
 			log_debug("dm_scan() failed: %d\n", ret);
 			return ret;
 		}
 	}
 	if (CONFIG_IS_ENABLED(DM_EVENT)) {
 		ret = event_notify_null(gd->flags & GD_FLG_RELOC ?
 					EVT_DM_POST_INIT_R :
 					EVT_DM_POST_INIT_F);
 		if (ret)
 			return log_msg_ret("ev", ret);
 	}

 	return 0;
 }

 void dm_get_stats(int *device_countp, int *uclass_countp)
 {
 	*device_countp = device_get_decendent_count(gd->dm_root);
 	*uclass_countp = uclass_get_count();
 }

 void dev_collect_stats(struct dm_stats *stats, const struct udevice *parent)
 {
 	const struct udevice *dev;
 	int i;

 	stats->dev_count++;
 	stats->dev_size += sizeof(struct udevice);
 	stats->dev_name_size += strlen(parent->name) + 1;
 	for (i = 0; i < DM_TAG_ATTACH_COUNT; i++) {
 		int size = dev_get_attach_size(parent, i);

 		if (size ||
 		    (i == DM_TAG_DRIVER_DATA && parent->driver_data)) {
 			stats->attach_count[i]++;
 			stats->attach_size[i] += size;
 			stats->attach_count_total++;
 			stats->attach_size_total += size;
 		}
 	}

 	list_for_each_entry(dev, &parent->child_head, sibling_node)
 		dev_collect_stats(stats, dev);
 }

 void uclass_collect_stats(struct dm_stats *stats)
 {
 	struct uclass *uc;

 	list_for_each_entry(uc, gd->uclass_root, sibling_node) {
 		int size;

 		stats->uc_count++;
 		stats->uc_size += sizeof(struct uclass);
 		size = uc->uc_drv->priv_auto;
 		if (size) {
 			stats->uc_attach_count++;
 			stats->uc_attach_size += size;
 		}
 	}
 }

 void dm_get_mem(struct dm_stats *stats)
 {
 	memset(stats, '\0', sizeof(*stats));
 	dev_collect_stats(stats, gd->dm_root);
 	uclass_collect_stats(stats);
 	dev_tag_collect_stats(stats);

 	stats->total_size = stats->dev_size + stats->uc_size +
 		stats->attach_size_total + stats->uc_attach_size +
 		stats->tag_size;
 }

 #ifdef CONFIG_ACPIGEN
 static int root_acpi_get_name(const struct udevice *dev, char *out_name)
 {
 	return acpi_copy_name(out_name, "\\_SB");
 }

 struct acpi_ops root_acpi_ops = {
 	.get_name	= root_acpi_get_name,
 };
 #endif

 /* This is the root driver - all drivers are children of this */
 U_BOOT_DRIVER(root_driver) = {
 	.name	= "root_driver",
 	.id	= UCLASS_ROOT,
 	ACPI_OPS_PTR(&root_acpi_ops)
 };

 /* This is the root uclass */
 UCLASS_DRIVER(root) = {
 	.name	= "root",
 	.id	= UCLASS_ROOT,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (c) 2013 Google, Inc
	*
	* (C) Copyright 2012
	* Pavel Herrmann <morpheus.ibis@gmail.com>
	*/

	#define LOG_CATEGORY UCLASS_ROOT

	#include <common.h>
	#include <errno.h>
	#include <fdtdec.h>
	#include <log.h>
	#include <malloc.h>
	#include <asm-generic/sections.h>
	#include <asm/global_data.h>
	#include <linux/libfdt.h>
	#include <dm/acpi.h>
	#include <dm/device.h>
	#include <dm/device-internal.h>
	#include <dm/lists.h>
	#include <dm/of.h>
	#include <dm/of_access.h>
	#include <dm/platdata.h>
	#include <dm/read.h>
	#include <dm/root.h>
	#include <dm/uclass.h>
	#include <dm/uclass-internal.h>
	#include <dm/util.h>
	#include <linux/list.h>
	#include <linux/printk.h>

	DECLARE_GLOBAL_DATA_PTR;

	static struct driver_info root_info = {
	.name = "root_driver",
	};

	struct udevice *dm_root(void)
	{
	if (!gd->dm_root) {
	dm_warn("Virtual root driver does not exist!\n");
	return NULL;
	}

	return gd->dm_root;
	}

	void dm_fixup_for_gd_move(struct global_data *new_gd)
	{
	/* The sentinel node has moved, so update things that point to it */
	if (gd->dm_root) {
	new_gd->uclass_root->next->prev = new_gd->uclass_root;
	new_gd->uclass_root->prev->next = new_gd->uclass_root;
	}
	}

	static int dm_setup_inst(void)
	{
	DM_ROOT_NON_CONST = DM_DEVICE_GET(root);

	if (CONFIG_IS_ENABLED(OF_PLATDATA_RT)) {
	struct udevice_rt *urt;
	void start, end;
	int each_size;
	void *base;
	int n_ents;
	uint size;

	/* Allocate the udevice_rt table */
	each_size = dm_udevice_size();
	start = ll_entry_start(struct udevice, udevice);
	end = ll_entry_end(struct udevice, udevice);
	size = end - start;
	n_ents = size / each_size;
	urt = calloc(n_ents, sizeof(struct udevice_rt));
	if (!urt)
	return log_msg_ret("urt", -ENOMEM);
	gd_set_dm_udevice_rt(urt);

	/* Now allocate space for the priv/plat data, and copy it in */
	size = __priv_data_end - __priv_data_start;

	base = calloc(1, size);
	if (!base)
	return log_msg_ret("priv", -ENOMEM);
	memcpy(base, __priv_data_start, size);
	gd_set_dm_priv_base(base);
	}

	return 0;
	}

	int dm_init(bool of_live)
	{
	int ret;

	if (gd->dm_root) {
	dm_warn("Virtual root driver already exists!\n");
	return -EINVAL;
	}
	if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
	gd->uclass_root = &uclass_head;
	} else {
	gd->uclass_root = &DM_UCLASS_ROOT_S_NON_CONST;
	INIT_LIST_HEAD(DM_UCLASS_ROOT_NON_CONST);
	}

	if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
	ret = dm_setup_inst();
	if (ret) {
	log_debug("dm_setup_inst() failed: %d\n", ret);
	return ret;
	}
	} else {
	ret = device_bind_by_name(NULL, false, &root_info,
	&DM_ROOT_NON_CONST);
	if (ret)
	return ret;
	if (CONFIG_IS_ENABLED(OF_CONTROL))
	dev_set_ofnode(DM_ROOT_NON_CONST, ofnode_root());
	ret = device_probe(DM_ROOT_NON_CONST);
	if (ret)
	return ret;
	}

	INIT_LIST_HEAD((struct list_head *)&gd->dmtag_list);

	return 0;
	}

	int dm_uninit(void)
	{
	/* Remove non-vital devices first */
	device_remove(dm_root(), DM_REMOVE_NON_VITAL);
	device_remove(dm_root(), DM_REMOVE_NORMAL);
	device_unbind(dm_root());
	gd->dm_root = NULL;

	return 0;
	}

	#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
	int dm_remove_devices_flags(uint flags)
	{
	device_remove(dm_root(), flags);

	return 0;
	}
	#endif

	int dm_scan_plat(bool pre_reloc_only)
	{
	int ret;

	if (CONFIG_IS_ENABLED(OF_PLATDATA_DRIVER_RT)) {
	struct driver_rt *dyn;
	int n_ents;

	n_ents = ll_entry_count(struct driver_info, driver_info);
	dyn = calloc(n_ents, sizeof(struct driver_rt));
	if (!dyn)
	return -ENOMEM;
	gd_set_dm_driver_rt(dyn);
	}

	ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
	if (ret == -ENOENT) {
	dm_warn("Some drivers were not found\n");
	ret = 0;
	}

	return ret;
	}

	#if CONFIG_IS_ENABLED(OF_REAL)
	/**
	* dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
	*
	* This scans the subnodes of a device tree node and and creates a driver
	* for each one.
	*
	* @parent: Parent device for the devices that will be created
	* @node: Node to scan
	* @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
	* flag. If false bind all drivers.
	* Return: 0 if OK, -ve on error
	*/
	static int dm_scan_fdt_node(struct udevice *parent, ofnode parent_node,
	bool pre_reloc_only)
	{
	int ret = 0, err = 0;
	ofnode node;

	if (!ofnode_valid(parent_node))
	return 0;

	for (node = ofnode_first_subnode(parent_node);
	ofnode_valid(node);
	node = ofnode_next_subnode(node)) {
	const char *node_name = ofnode_get_name(node);

	if (!ofnode_is_enabled(node)) {
	pr_debug(" - ignoring disabled device\n");
	continue;
	}
	err = lists_bind_fdt(parent, node, NULL, NULL, pre_reloc_only);
	if (err && !ret) {
	ret = err;
	debug("%s: ret=%d\n", node_name, ret);
	}
	}

	if (ret)
	dm_warn("Some drivers failed to bind\n");

	return ret;
	}

	int dm_scan_fdt_dev(struct udevice *dev)
	{
	return dm_scan_fdt_node(dev, dev_ofnode(dev),
	gd->flags & GD_FLG_RELOC ? false : true);
	}

	int dm_scan_fdt(bool pre_reloc_only)
	{
	return dm_scan_fdt_node(gd->dm_root, ofnode_root(), pre_reloc_only);
	}

	static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
	{
	ofnode node;

	node = ofnode_path(path);

	return dm_scan_fdt_node(gd->dm_root, node, pre_reloc_only);
	}

	int dm_extended_scan(bool pre_reloc_only)
	{
	int ret, i;
	const char * const nodes[] = {
	"/chosen",
	"/clocks",
	"/firmware"
	};

	ret = dm_scan_fdt(pre_reloc_only);
	if (ret) {
	debug("dm_scan_fdt() failed: %d\n", ret);
	return ret;
	}

	/* Some nodes aren't devices themselves but may contain some */
	for (i = 0; i < ARRAY_SIZE(nodes); i++) {
	ret = dm_scan_fdt_ofnode_path(nodes[i], pre_reloc_only);
	if (ret) {
	debug("dm_scan_fdt() scan for %s failed: %d\n",
	nodes[i], ret);
	return ret;
	}
	}

	return ret;
	}
	#endif

	__weak int dm_scan_other(bool pre_reloc_only)
	{
	return 0;
	}

	#if CONFIG_IS_ENABLED(OF_PLATDATA_INST) && CONFIG_IS_ENABLED(READ_ONLY)
	void dm_priv_to_rw(void priv)
	{
	long offset = priv - (void *)__priv_data_start;

	return gd_dm_priv_base() + offset;
	}
	#endif

	static int dm_probe_devices(struct udevice *dev, bool pre_reloc_only)
	{
	ofnode node = dev_ofnode(dev);
	struct udevice *child;
	int ret;

	if (pre_reloc_only &&
	(!ofnode_valid(node) \|\| !ofnode_pre_reloc(node)) &&
	!(dev->driver->flags & DM_FLAG_PRE_RELOC))
	goto probe_children;

	if (dev_get_flags(dev) & DM_FLAG_PROBE_AFTER_BIND) {
	ret = device_probe(dev);
	if (ret)
	return ret;
	}

	probe_children:
	list_for_each_entry(child, &dev->child_head, sibling_node)
	dm_probe_devices(child, pre_reloc_only);

	return 0;
	}

	/**
	* dm_scan() - Scan tables to bind devices
	*
	* Runs through the driver_info tables and binds the devices it finds. Then runs
	* through the devicetree nodes. Finally calls dm_scan_other() to add any
	* special devices
	*
	* @pre_reloc_only: If true, bind only nodes with special devicetree properties,
	* or drivers with the DM_FLAG_PRE_RELOC flag. If false bind all drivers.
	*/
	static int dm_scan(bool pre_reloc_only)
	{
	int ret;

	ret = dm_scan_plat(pre_reloc_only);
	if (ret) {
	debug("dm_scan_plat() failed: %d\n", ret);
	return ret;
	}

	if (CONFIG_IS_ENABLED(OF_REAL)) {
	ret = dm_extended_scan(pre_reloc_only);
	if (ret) {
	debug("dm_extended_scan() failed: %d\n", ret);
	return ret;
	}
	}

	ret = dm_scan_other(pre_reloc_only);
	if (ret)
	return ret;

	return dm_probe_devices(gd->dm_root, pre_reloc_only);
	}

	int dm_init_and_scan(bool pre_reloc_only)
	{
	int ret;

	ret = dm_init(CONFIG_IS_ENABLED(OF_LIVE));
	if (ret) {
	debug("dm_init() failed: %d\n", ret);
	return ret;
	}
	if (!CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
	ret = dm_scan(pre_reloc_only);
	if (ret) {
	log_debug("dm_scan() failed: %d\n", ret);
	return ret;
	}
	}
	if (CONFIG_IS_ENABLED(DM_EVENT)) {
	ret = event_notify_null(gd->flags & GD_FLG_RELOC ?
	EVT_DM_POST_INIT_R :
	EVT_DM_POST_INIT_F);
	if (ret)
	return log_msg_ret("ev", ret);
	}

	return 0;
	}

	void dm_get_stats(int device_countp, int uclass_countp)
	{
	*device_countp = device_get_decendent_count(gd->dm_root);
	*uclass_countp = uclass_get_count();
	}

	void dev_collect_stats(struct dm_stats stats, const struct udevice parent)
	{
	const struct udevice *dev;
	int i;

	stats->dev_count++;
	stats->dev_size += sizeof(struct udevice);
	stats->dev_name_size += strlen(parent->name) + 1;
	for (i = 0; i < DM_TAG_ATTACH_COUNT; i++) {
	int size = dev_get_attach_size(parent, i);

	if (size \|\|
	(i == DM_TAG_DRIVER_DATA && parent->driver_data)) {
	stats->attach_count[i]++;
	stats->attach_size[i] += size;
	stats->attach_count_total++;
	stats->attach_size_total += size;
	}
	}

	list_for_each_entry(dev, &parent->child_head, sibling_node)
	dev_collect_stats(stats, dev);
	}

	void uclass_collect_stats(struct dm_stats *stats)
	{
	struct uclass *uc;

	list_for_each_entry(uc, gd->uclass_root, sibling_node) {
	int size;

	stats->uc_count++;
	stats->uc_size += sizeof(struct uclass);
	size = uc->uc_drv->priv_auto;
	if (size) {
	stats->uc_attach_count++;
	stats->uc_attach_size += size;
	}
	}
	}

	void dm_get_mem(struct dm_stats *stats)
	{
	memset(stats, '\0', sizeof(*stats));
	dev_collect_stats(stats, gd->dm_root);
	uclass_collect_stats(stats);
	dev_tag_collect_stats(stats);

	stats->total_size = stats->dev_size + stats->uc_size +
	stats->attach_size_total + stats->uc_attach_size +
	stats->tag_size;
	}

	#ifdef CONFIG_ACPIGEN
	static int root_acpi_get_name(const struct udevice dev, char out_name)
	{
	return acpi_copy_name(out_name, "\\_SB");
	}

	struct acpi_ops root_acpi_ops = {
	.get_name = root_acpi_get_name,
	};
	#endif

	/* This is the root driver - all drivers are children of this */
	U_BOOT_DRIVER(root_driver) = {
	.name = "root_driver",
	.id = UCLASS_ROOT,
	ACPI_OPS_PTR(&root_acpi_ops)
	};

	/* This is the root uclass */
	UCLASS_DRIVER(root) = {
	.name = "root",
	.id = UCLASS_ROOT,
	};