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

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

 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <malloc.h>
 #include <dm/device.h>
 #include <dm/device-internal.h>
 #include <dm/lists.h>
 #include <dm/uclass.h>
 #include <dm/uclass-internal.h>
 #include <dm/util.h>

 DECLARE_GLOBAL_DATA_PTR;

 struct uclass *uclass_find(enum uclass_id key)
 {
 	struct uclass *uc;

 	if (!gd->dm_root)
 		return NULL;
 	/*
 	 * TODO(sjg@chromium.org): Optimise this, perhaps moving the found
 	 * node to the start of the list, or creating a linear array mapping
 	 * id to node.
 	 */
 	list_for_each_entry(uc, &gd->uclass_root, sibling_node) {
 		if (uc->uc_drv->id == key)
 			return uc;
 	}

 	return NULL;
 }

 /**
  * uclass_add() - Create new uclass in list
  * @id: Id number to create
  * @ucp: Returns pointer to uclass, or NULL on error
  * @return 0 on success, -ve on error
  *
  * The new uclass is added to the list. There must be only one uclass for
  * each id.
  */
 static int uclass_add(enum uclass_id id, struct uclass **ucp)
 {
 	struct uclass_driver *uc_drv;
 	struct uclass *uc;
 	int ret;

 	*ucp = NULL;
 	uc_drv = lists_uclass_lookup(id);
 	if (!uc_drv) {
 		debug("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
 		      id);
 		/*
 		 * Use a strange error to make this case easier to find. When
 		 * a uclass is not available it can prevent driver model from
 		 * starting up and this failure is otherwise hard to debug.
 		 */
 		return -EPFNOSUPPORT;
 	}
 	uc = calloc(1, sizeof(*uc));
 	if (!uc)
 		return -ENOMEM;
 	if (uc_drv->priv_auto_alloc_size) {
 		uc->priv = calloc(1, uc_drv->priv_auto_alloc_size);
 		if (!uc->priv) {
 			ret = -ENOMEM;
 			goto fail_mem;
 		}
 	}
 	uc->uc_drv = uc_drv;
 	INIT_LIST_HEAD(&uc->sibling_node);
 	INIT_LIST_HEAD(&uc->dev_head);
 	list_add(&uc->sibling_node, &DM_UCLASS_ROOT_NON_CONST);

 	if (uc_drv->init) {
 		ret = uc_drv->init(uc);
 		if (ret)
 			goto fail;
 	}

 	*ucp = uc;

 	return 0;
 fail:
 	if (uc_drv->priv_auto_alloc_size) {
 		free(uc->priv);
 		uc->priv = NULL;
 	}
 	list_del(&uc->sibling_node);
 fail_mem:
 	free(uc);

 	return ret;
 }

 int uclass_destroy(struct uclass *uc)
 {
 	struct uclass_driver *uc_drv;
 	struct udevice *dev;
 	int ret;

 	/*
 	 * We cannot use list_for_each_entry_safe() here. If a device in this
 	 * uclass has a child device also in this uclass, it will be also be
 	 * unbound (by the recursion in the call to device_unbind() below).
 	 * We can loop until the list is empty.
 	 */
 	while (!list_empty(&uc->dev_head)) {
 		dev = list_first_entry(&uc->dev_head, struct udevice,
 				       uclass_node);
 		ret = device_remove(dev, DM_REMOVE_NORMAL);
 		if (ret)
 			return ret;
 		ret = device_unbind(dev);
 		if (ret)
 			return ret;
 	}

 	uc_drv = uc->uc_drv;
 	if (uc_drv->destroy)
 		uc_drv->destroy(uc);
 	list_del(&uc->sibling_node);
 	if (uc_drv->priv_auto_alloc_size)
 		free(uc->priv);
 	free(uc);

 	return 0;
 }

 int uclass_get(enum uclass_id id, struct uclass **ucp)
 {
 	struct uclass *uc;

 	*ucp = NULL;
 	uc = uclass_find(id);
 	if (!uc)
 		return uclass_add(id, ucp);
 	*ucp = uc;

 	return 0;
 }

 const char *uclass_get_name(enum uclass_id id)
 {
 	struct uclass *uc;

 	if (uclass_get(id, &uc))
 		return NULL;
 	return uc->uc_drv->name;
 }

 enum uclass_id uclass_get_by_name(const char *name)
 {
 	int i;

 	for (i = 0; i < UCLASS_COUNT; i++) {
 		struct uclass_driver *uc_drv = lists_uclass_lookup(i);

 		if (uc_drv && !strcmp(uc_drv->name, name))
 			return i;
 	}

 	return UCLASS_INVALID;
 }

 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
 {
 	struct uclass *uc;
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	ret = uclass_get(id, &uc);
 	if (ret)
 		return ret;
 	if (list_empty(&uc->dev_head))
 		return -ENODEV;

 	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
 		if (!index--) {
 			*devp = dev;
 			return 0;
 		}
 	}

 	return -ENODEV;
 }

 int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
 {
 	struct uclass *uc;
 	int ret;

 	*devp = NULL;
 	ret = uclass_get(id, &uc);
 	if (ret)
 		return ret;
 	if (list_empty(&uc->dev_head))
 		return 0;

 	*devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);

 	return 0;
 }

 int uclass_find_next_device(struct udevice **devp)
 {
 	struct udevice *dev = *devp;

 	*devp = NULL;
 	if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
 		return 0;

 	*devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node);

 	return 0;
 }

 int uclass_find_device_by_name(enum uclass_id id, const char *name,
 			       struct udevice **devp)
 {
 	struct uclass *uc;
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	if (!name)
 		return -EINVAL;
 	ret = uclass_get(id, &uc);
 	if (ret)
 		return ret;

 	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
 		if (!strncmp(dev->name, name, strlen(name))) {
 			*devp = dev;
 			return 0;
 		}
 	}

 	return -ENODEV;
 }

 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
 			      bool find_req_seq, struct udevice **devp)
 {
 	struct uclass *uc;
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	debug("%s: %d %d\n", __func__, find_req_seq, seq_or_req_seq);
 	if (seq_or_req_seq == -1)
 		return -ENODEV;
 	ret = uclass_get(id, &uc);
 	if (ret)
 		return ret;

 	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
 		debug("   - %d %d '%s'\n", dev->req_seq, dev->seq, dev->name);
 		if ((find_req_seq ? dev->req_seq : dev->seq) ==
 				seq_or_req_seq) {
 			*devp = dev;
 			debug("   - found\n");
 			return 0;
 		}
 	}
 	debug("   - not found\n");

 	return -ENODEV;
 }

 int uclass_find_device_by_of_offset(enum uclass_id id, int node,
 				    struct udevice **devp)
 {
 	struct uclass *uc;
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	if (node < 0)
 		return -ENODEV;
 	ret = uclass_get(id, &uc);
 	if (ret)
 		return ret;

 	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
 		if (dev_of_offset(dev) == node) {
 			*devp = dev;
 			return 0;
 		}
 	}

 	return -ENODEV;
 }

 int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
 				 struct udevice **devp)
 {
 	struct uclass *uc;
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	if (!ofnode_valid(node))
 		return -ENODEV;
 	ret = uclass_get(id, &uc);
 	if (ret)
 		return ret;

 	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
 		if (ofnode_equal(dev_ofnode(dev), node)) {
 			*devp = dev;
 			return 0;
 		}
 	}

 	return -ENODEV;
 }

 #if CONFIG_IS_ENABLED(OF_CONTROL)
 static int uclass_find_device_by_phandle(enum uclass_id id,
 					 struct udevice *parent,
 					 const char *name,
 					 struct udevice **devp)
 {
 	struct udevice *dev;
 	struct uclass *uc;
 	int find_phandle;
 	int ret;

 	*devp = NULL;
 	find_phandle = dev_read_u32_default(parent, name, -1);
 	if (find_phandle <= 0)
 		return -ENOENT;
 	ret = uclass_get(id, &uc);
 	if (ret)
 		return ret;

 	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
 		uint phandle;

 		phandle = dev_read_phandle(dev);

 		if (phandle == find_phandle) {
 			*devp = dev;
 			return 0;
 		}
 	}

 	return -ENODEV;
 }
 #endif

 int uclass_get_device_by_driver(enum uclass_id id,
 				const struct driver *find_drv,
 				struct udevice **devp)
 {
 	struct udevice *dev;
 	struct uclass *uc;
 	int ret;

 	ret = uclass_get(id, &uc);
 	if (ret)
 		return ret;

 	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
 		if (dev->driver == find_drv)
 			return uclass_get_device_tail(dev, 0, devp);
 	}

 	return -ENODEV;
 }

 int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp)
 {
 	if (ret)
 		return ret;

 	assert(dev);
 	ret = device_probe(dev);
 	if (ret)
 		return ret;

 	*devp = dev;

 	return 0;
 }

 int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
 {
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	ret = uclass_find_device(id, index, &dev);
 	return uclass_get_device_tail(dev, ret, devp);
 }

 int uclass_get_device_by_name(enum uclass_id id, const char *name,
 			      struct udevice **devp)
 {
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	ret = uclass_find_device_by_name(id, name, &dev);
 	return uclass_get_device_tail(dev, ret, devp);
 }

 int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
 {
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	ret = uclass_find_device_by_seq(id, seq, false, &dev);
 	if (ret == -ENODEV) {
 		/*
 		 * We didn't find it in probed devices. See if there is one
 		 * that will request this seq if probed.
 		 */
 		ret = uclass_find_device_by_seq(id, seq, true, &dev);
 	}
 	return uclass_get_device_tail(dev, ret, devp);
 }

 int uclass_get_device_by_of_offset(enum uclass_id id, int node,
 				   struct udevice **devp)
 {
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	ret = uclass_find_device_by_of_offset(id, node, &dev);
 	return uclass_get_device_tail(dev, ret, devp);
 }

 int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
 				struct udevice **devp)
 {
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	ret = uclass_find_device_by_ofnode(id, node, &dev);

 	return uclass_get_device_tail(dev, ret, devp);
 }

 #if CONFIG_IS_ENABLED(OF_CONTROL)
 int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id,
 				    struct udevice **devp)
 {
 	struct udevice *dev;
 	struct uclass *uc;
 	int ret;

 	*devp = NULL;
 	ret = uclass_get(id, &uc);
 	if (ret)
 		return ret;

 	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
 		uint phandle;

 		phandle = dev_read_phandle(dev);

 		if (phandle == phandle_id) {
 			*devp = dev;
 			return uclass_get_device_tail(dev, ret, devp);
 		}
 	}

 	return -ENODEV;
 }

 int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
 				 const char *name, struct udevice **devp)
 {
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	ret = uclass_find_device_by_phandle(id, parent, name, &dev);
 	return uclass_get_device_tail(dev, ret, devp);
 }
 #endif

 int uclass_first_device(enum uclass_id id, struct udevice **devp)
 {
 	struct udevice *dev;
 	int ret;

 	*devp = NULL;
 	ret = uclass_find_first_device(id, &dev);
 	if (!dev)
 		return 0;
 	return uclass_get_device_tail(dev, ret, devp);
 }

 int uclass_first_device_err(enum uclass_id id, struct udevice **devp)
 {
 	int ret;

 	ret = uclass_first_device(id, devp);
 	if (ret)
 		return ret;
 	else if (!*devp)
 		return -ENODEV;

 	return 0;
 }

 int uclass_next_device(struct udevice **devp)
 {
 	struct udevice *dev = *devp;
 	int ret;

 	*devp = NULL;
 	ret = uclass_find_next_device(&dev);
 	if (!dev)
 		return 0;
 	return uclass_get_device_tail(dev, ret, devp);
 }

 int uclass_first_device_check(enum uclass_id id, struct udevice **devp)
 {
 	int ret;

 	*devp = NULL;
 	ret = uclass_find_first_device(id, devp);
 	if (ret)
 		return ret;
 	if (!*devp)
 		return 0;

 	return device_probe(*devp);
 }

 int uclass_next_device_check(struct udevice **devp)
 {
 	int ret;

 	ret = uclass_find_next_device(devp);
 	if (ret)
 		return ret;
 	if (!*devp)
 		return 0;

 	return device_probe(*devp);
 }

 int uclass_bind_device(struct udevice *dev)
 {
 	struct uclass *uc;
 	int ret;

 	uc = dev->uclass;
 	list_add_tail(&dev->uclass_node, &uc->dev_head);

 	if (dev->parent) {
 		struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv;

 		if (uc_drv->child_post_bind) {
 			ret = uc_drv->child_post_bind(dev);
 			if (ret)
 				goto err;
 		}
 	}

 	return 0;
 err:
 	/* There is no need to undo the parent's post_bind call */
 	list_del(&dev->uclass_node);

 	return ret;
 }

 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
 int uclass_unbind_device(struct udevice *dev)
 {
 	struct uclass *uc;
 	int ret;

 	uc = dev->uclass;
 	if (uc->uc_drv->pre_unbind) {
 		ret = uc->uc_drv->pre_unbind(dev);
 		if (ret)
 			return ret;
 	}

 	list_del(&dev->uclass_node);
 	return 0;
 }
 #endif

 int uclass_resolve_seq(struct udevice *dev)
 {
 	struct udevice *dup;
 	int seq;
 	int ret;

 	assert(dev->seq == -1);
 	ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq,
 					false, &dup);
 	if (!ret) {
 		dm_warn("Device '%s': seq %d is in use by '%s'\n",
 			dev->name, dev->req_seq, dup->name);
 	} else if (ret == -ENODEV) {
 		/* Our requested sequence number is available */
 		if (dev->req_seq != -1)
 			return dev->req_seq;
 	} else {
 		return ret;
 	}

 	for (seq = 0; seq < DM_MAX_SEQ; seq++) {
 		ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq,
 						false, &dup);
 		if (ret == -ENODEV)
 			break;
 		if (ret)
 			return ret;
 	}
 	return seq;
 }

 int uclass_pre_probe_device(struct udevice *dev)
 {
 	struct uclass_driver *uc_drv;
 	int ret;

 	uc_drv = dev->uclass->uc_drv;
 	if (uc_drv->pre_probe) {
 		ret = uc_drv->pre_probe(dev);
 		if (ret)
 			return ret;
 	}

 	if (!dev->parent)
 		return 0;
 	uc_drv = dev->parent->uclass->uc_drv;
 	if (uc_drv->child_pre_probe)
 		return uc_drv->child_pre_probe(dev);

 	return 0;
 }

 int uclass_post_probe_device(struct udevice *dev)
 {
 	struct uclass_driver *uc_drv = dev->uclass->uc_drv;

 	if (uc_drv->post_probe)
 		return uc_drv->post_probe(dev);

 	return 0;
 }

 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
 int uclass_pre_remove_device(struct udevice *dev)
 {
 	struct uclass *uc;
 	int ret;

 	uc = dev->uclass;
 	if (uc->uc_drv->pre_remove) {
 		ret = uc->uc_drv->pre_remove(dev);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }
 #endif
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (c) 2013 Google, Inc
	*
	* (C) Copyright 2012
	* Pavel Herrmann <morpheus.ibis@gmail.com>
	*/

	#include <common.h>
	#include <dm.h>
	#include <errno.h>
	#include <malloc.h>
	#include <dm/device.h>
	#include <dm/device-internal.h>
	#include <dm/lists.h>
	#include <dm/uclass.h>
	#include <dm/uclass-internal.h>
	#include <dm/util.h>

	DECLARE_GLOBAL_DATA_PTR;

	struct uclass *uclass_find(enum uclass_id key)
	{
	struct uclass *uc;

	if (!gd->dm_root)
	return NULL;
	/*
	* TODO(sjg@chromium.org): Optimise this, perhaps moving the found
	* node to the start of the list, or creating a linear array mapping
	* id to node.
	*/
	list_for_each_entry(uc, &gd->uclass_root, sibling_node) {
	if (uc->uc_drv->id == key)
	return uc;
	}

	return NULL;
	}

	/**
	* uclass_add() - Create new uclass in list
	* @id: Id number to create
	* @ucp: Returns pointer to uclass, or NULL on error
	* @return 0 on success, -ve on error
	*
	* The new uclass is added to the list. There must be only one uclass for
	* each id.
	*/
	static int uclass_add(enum uclass_id id, struct uclass **ucp)
	{
	struct uclass_driver *uc_drv;
	struct uclass *uc;
	int ret;

	*ucp = NULL;
	uc_drv = lists_uclass_lookup(id);
	if (!uc_drv) {
	debug("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
	id);
	/*
	* Use a strange error to make this case easier to find. When
	* a uclass is not available it can prevent driver model from
	* starting up and this failure is otherwise hard to debug.
	*/
	return -EPFNOSUPPORT;
	}
	uc = calloc(1, sizeof(*uc));
	if (!uc)
	return -ENOMEM;
	if (uc_drv->priv_auto_alloc_size) {
	uc->priv = calloc(1, uc_drv->priv_auto_alloc_size);
	if (!uc->priv) {
	ret = -ENOMEM;
	goto fail_mem;
	}
	}
	uc->uc_drv = uc_drv;
	INIT_LIST_HEAD(&uc->sibling_node);
	INIT_LIST_HEAD(&uc->dev_head);
	list_add(&uc->sibling_node, &DM_UCLASS_ROOT_NON_CONST);

	if (uc_drv->init) {
	ret = uc_drv->init(uc);
	if (ret)
	goto fail;
	}

	*ucp = uc;

	return 0;
	fail:
	if (uc_drv->priv_auto_alloc_size) {
	free(uc->priv);
	uc->priv = NULL;
	}
	list_del(&uc->sibling_node);
	fail_mem:
	free(uc);

	return ret;
	}

	int uclass_destroy(struct uclass *uc)
	{
	struct uclass_driver *uc_drv;
	struct udevice *dev;
	int ret;

	/*
	* We cannot use list_for_each_entry_safe() here. If a device in this
	* uclass has a child device also in this uclass, it will be also be
	* unbound (by the recursion in the call to device_unbind() below).
	* We can loop until the list is empty.
	*/
	while (!list_empty(&uc->dev_head)) {
	dev = list_first_entry(&uc->dev_head, struct udevice,
	uclass_node);
	ret = device_remove(dev, DM_REMOVE_NORMAL);
	if (ret)
	return ret;
	ret = device_unbind(dev);
	if (ret)
	return ret;
	}

	uc_drv = uc->uc_drv;
	if (uc_drv->destroy)
	uc_drv->destroy(uc);
	list_del(&uc->sibling_node);
	if (uc_drv->priv_auto_alloc_size)
	free(uc->priv);
	free(uc);

	return 0;
	}

	int uclass_get(enum uclass_id id, struct uclass **ucp)
	{
	struct uclass *uc;

	*ucp = NULL;
	uc = uclass_find(id);
	if (!uc)
	return uclass_add(id, ucp);
	*ucp = uc;

	return 0;
	}

	const char *uclass_get_name(enum uclass_id id)
	{
	struct uclass *uc;

	if (uclass_get(id, &uc))
	return NULL;
	return uc->uc_drv->name;
	}

	enum uclass_id uclass_get_by_name(const char *name)
	{
	int i;

	for (i = 0; i < UCLASS_COUNT; i++) {
	struct uclass_driver *uc_drv = lists_uclass_lookup(i);

	if (uc_drv && !strcmp(uc_drv->name, name))
	return i;
	}

	return UCLASS_INVALID;
	}

	int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
	{
	struct uclass *uc;
	struct udevice *dev;
	int ret;

	*devp = NULL;
	ret = uclass_get(id, &uc);
	if (ret)
	return ret;
	if (list_empty(&uc->dev_head))
	return -ENODEV;

	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
	if (!index--) {
	*devp = dev;
	return 0;
	}
	}

	return -ENODEV;
	}

	int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
	{
	struct uclass *uc;
	int ret;

	*devp = NULL;
	ret = uclass_get(id, &uc);
	if (ret)
	return ret;
	if (list_empty(&uc->dev_head))
	return 0;

	*devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);

	return 0;
	}

	int uclass_find_next_device(struct udevice **devp)
	{
	struct udevice dev = devp;

	*devp = NULL;
	if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
	return 0;

	*devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node);

	return 0;
	}

	int uclass_find_device_by_name(enum uclass_id id, const char *name,
	struct udevice **devp)
	{
	struct uclass *uc;
	struct udevice *dev;
	int ret;

	*devp = NULL;
	if (!name)
	return -EINVAL;
	ret = uclass_get(id, &uc);
	if (ret)
	return ret;

	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
	if (!strncmp(dev->name, name, strlen(name))) {
	*devp = dev;
	return 0;
	}
	}

	return -ENODEV;
	}

	int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
	bool find_req_seq, struct udevice **devp)
	{
	struct uclass *uc;
	struct udevice *dev;
	int ret;

	*devp = NULL;
	debug("%s: %d %d\n", __func__, find_req_seq, seq_or_req_seq);
	if (seq_or_req_seq == -1)
	return -ENODEV;
	ret = uclass_get(id, &uc);
	if (ret)
	return ret;

	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
	debug(" - %d %d '%s'\n", dev->req_seq, dev->seq, dev->name);
	if ((find_req_seq ? dev->req_seq : dev->seq) ==
	seq_or_req_seq) {
	*devp = dev;
	debug(" - found\n");
	return 0;
	}
	}
	debug(" - not found\n");

	return -ENODEV;
	}

	int uclass_find_device_by_of_offset(enum uclass_id id, int node,
	struct udevice **devp)
	{
	struct uclass *uc;
	struct udevice *dev;
	int ret;

	*devp = NULL;
	if (node < 0)
	return -ENODEV;
	ret = uclass_get(id, &uc);
	if (ret)
	return ret;

	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
	if (dev_of_offset(dev) == node) {
	*devp = dev;
	return 0;
	}
	}

	return -ENODEV;
	}

	int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
	struct udevice **devp)
	{
	struct uclass *uc;
	struct udevice *dev;
	int ret;

	*devp = NULL;
	if (!ofnode_valid(node))
	return -ENODEV;
	ret = uclass_get(id, &uc);
	if (ret)
	return ret;

	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
	if (ofnode_equal(dev_ofnode(dev), node)) {
	*devp = dev;
	return 0;
	}
	}

	return -ENODEV;
	}

	#if CONFIG_IS_ENABLED(OF_CONTROL)
	static int uclass_find_device_by_phandle(enum uclass_id id,
	struct udevice *parent,
	const char *name,
	struct udevice **devp)
	{
	struct udevice *dev;
	struct uclass *uc;
	int find_phandle;
	int ret;

	*devp = NULL;
	find_phandle = dev_read_u32_default(parent, name, -1);
	if (find_phandle <= 0)
	return -ENOENT;
	ret = uclass_get(id, &uc);
	if (ret)
	return ret;

	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
	uint phandle;

	phandle = dev_read_phandle(dev);

	if (phandle == find_phandle) {
	*devp = dev;
	return 0;
	}
	}

	return -ENODEV;
	}
	#endif

	int uclass_get_device_by_driver(enum uclass_id id,
	const struct driver *find_drv,
	struct udevice **devp)
	{
	struct udevice *dev;
	struct uclass *uc;
	int ret;

	ret = uclass_get(id, &uc);
	if (ret)
	return ret;

	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
	if (dev->driver == find_drv)
	return uclass_get_device_tail(dev, 0, devp);
	}

	return -ENODEV;
	}

	int uclass_get_device_tail(struct udevice dev, int ret, struct udevice *devp)
	{
	if (ret)
	return ret;

	assert(dev);
	ret = device_probe(dev);
	if (ret)
	return ret;

	*devp = dev;

	return 0;
	}

	int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
	{
	struct udevice *dev;
	int ret;

	*devp = NULL;
	ret = uclass_find_device(id, index, &dev);
	return uclass_get_device_tail(dev, ret, devp);
	}

	int uclass_get_device_by_name(enum uclass_id id, const char *name,
	struct udevice **devp)
	{
	struct udevice *dev;
	int ret;

	*devp = NULL;
	ret = uclass_find_device_by_name(id, name, &dev);
	return uclass_get_device_tail(dev, ret, devp);
	}

	int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
	{
	struct udevice *dev;
	int ret;

	*devp = NULL;
	ret = uclass_find_device_by_seq(id, seq, false, &dev);
	if (ret == -ENODEV) {
	/*
	* We didn't find it in probed devices. See if there is one
	* that will request this seq if probed.
	*/
	ret = uclass_find_device_by_seq(id, seq, true, &dev);
	}
	return uclass_get_device_tail(dev, ret, devp);
	}

	int uclass_get_device_by_of_offset(enum uclass_id id, int node,
	struct udevice **devp)
	{
	struct udevice *dev;
	int ret;

	*devp = NULL;
	ret = uclass_find_device_by_of_offset(id, node, &dev);
	return uclass_get_device_tail(dev, ret, devp);
	}

	int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
	struct udevice **devp)
	{
	struct udevice *dev;
	int ret;

	*devp = NULL;
	ret = uclass_find_device_by_ofnode(id, node, &dev);

	return uclass_get_device_tail(dev, ret, devp);
	}

	#if CONFIG_IS_ENABLED(OF_CONTROL)
	int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id,
	struct udevice **devp)
	{
	struct udevice *dev;
	struct uclass *uc;
	int ret;

	*devp = NULL;
	ret = uclass_get(id, &uc);
	if (ret)
	return ret;

	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
	uint phandle;

	phandle = dev_read_phandle(dev);

	if (phandle == phandle_id) {
	*devp = dev;
	return uclass_get_device_tail(dev, ret, devp);
	}
	}

	return -ENODEV;
	}

	int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
	const char name, struct udevice *devp)
	{
	struct udevice *dev;
	int ret;

	*devp = NULL;
	ret = uclass_find_device_by_phandle(id, parent, name, &dev);
	return uclass_get_device_tail(dev, ret, devp);
	}
	#endif

	int uclass_first_device(enum uclass_id id, struct udevice **devp)
	{
	struct udevice *dev;
	int ret;

	*devp = NULL;
	ret = uclass_find_first_device(id, &dev);
	if (!dev)
	return 0;
	return uclass_get_device_tail(dev, ret, devp);
	}

	int uclass_first_device_err(enum uclass_id id, struct udevice **devp)
	{
	int ret;

	ret = uclass_first_device(id, devp);
	if (ret)
	return ret;
	else if (!*devp)
	return -ENODEV;

	return 0;
	}

	int uclass_next_device(struct udevice **devp)
	{
	struct udevice dev = devp;
	int ret;

	*devp = NULL;
	ret = uclass_find_next_device(&dev);
	if (!dev)
	return 0;
	return uclass_get_device_tail(dev, ret, devp);
	}

	int uclass_first_device_check(enum uclass_id id, struct udevice **devp)
	{
	int ret;

	*devp = NULL;
	ret = uclass_find_first_device(id, devp);
	if (ret)
	return ret;
	if (!*devp)
	return 0;

	return device_probe(*devp);
	}

	int uclass_next_device_check(struct udevice **devp)
	{
	int ret;

	ret = uclass_find_next_device(devp);
	if (ret)
	return ret;
	if (!*devp)
	return 0;

	return device_probe(*devp);
	}

	int uclass_bind_device(struct udevice *dev)
	{
	struct uclass *uc;
	int ret;

	uc = dev->uclass;
	list_add_tail(&dev->uclass_node, &uc->dev_head);

	if (dev->parent) {
	struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv;

	if (uc_drv->child_post_bind) {
	ret = uc_drv->child_post_bind(dev);
	if (ret)
	goto err;
	}
	}

	return 0;
	err:
	/* There is no need to undo the parent's post_bind call */
	list_del(&dev->uclass_node);

	return ret;
	}

	#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
	int uclass_unbind_device(struct udevice *dev)
	{
	struct uclass *uc;
	int ret;

	uc = dev->uclass;
	if (uc->uc_drv->pre_unbind) {
	ret = uc->uc_drv->pre_unbind(dev);
	if (ret)
	return ret;
	}

	list_del(&dev->uclass_node);
	return 0;
	}
	#endif

	int uclass_resolve_seq(struct udevice *dev)
	{
	struct udevice *dup;
	int seq;
	int ret;

	assert(dev->seq == -1);
	ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq,
	false, &dup);
	if (!ret) {
	dm_warn("Device '%s': seq %d is in use by '%s'\n",
	dev->name, dev->req_seq, dup->name);
	} else if (ret == -ENODEV) {
	/* Our requested sequence number is available */
	if (dev->req_seq != -1)
	return dev->req_seq;
	} else {
	return ret;
	}

	for (seq = 0; seq < DM_MAX_SEQ; seq++) {
	ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq,
	false, &dup);
	if (ret == -ENODEV)
	break;
	if (ret)
	return ret;
	}
	return seq;
	}

	int uclass_pre_probe_device(struct udevice *dev)
	{
	struct uclass_driver *uc_drv;
	int ret;

	uc_drv = dev->uclass->uc_drv;
	if (uc_drv->pre_probe) {
	ret = uc_drv->pre_probe(dev);
	if (ret)
	return ret;
	}

	if (!dev->parent)
	return 0;
	uc_drv = dev->parent->uclass->uc_drv;
	if (uc_drv->child_pre_probe)
	return uc_drv->child_pre_probe(dev);

	return 0;
	}

	int uclass_post_probe_device(struct udevice *dev)
	{
	struct uclass_driver *uc_drv = dev->uclass->uc_drv;

	if (uc_drv->post_probe)
	return uc_drv->post_probe(dev);

	return 0;
	}

	#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
	int uclass_pre_remove_device(struct udevice *dev)
	{
	struct uclass *uc;
	int ret;

	uc = dev->uclass;
	if (uc->uc_drv->pre_remove) {
	ret = uc->uc_drv->pre_remove(dev);
	if (ret)
	return ret;
	}

	return 0;
	}
	#endif