[J-u-boot.git] / drivers / core / device.c

/*
 * Device manager
 *
 * Copyright (c) 2013 Google, Inc
 *
 * (C) Copyright 2012
 * Pavel Herrmann <[email protected]>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <fdtdec.h>
#include <malloc.h>
#include <dm/device.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/platdata.h>
#include <dm/uclass.h>
#include <dm/uclass-internal.h>
#include <dm/util.h>
#include <linux/err.h>
#include <linux/list.h>

DECLARE_GLOBAL_DATA_PTR;

int device_bind(struct udevice *parent, struct driver *drv, const char *name,
		void *platdata, int of_offset, struct udevice **devp)
{
	struct udevice *dev;
	struct uclass *uc;
	int ret = 0;

	*devp = NULL;
	if (!name)
		return -EINVAL;

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

	dev = calloc(1, sizeof(struct udevice));
	if (!dev)
		return -ENOMEM;

	INIT_LIST_HEAD(&dev->sibling_node);
	INIT_LIST_HEAD(&dev->child_head);
	INIT_LIST_HEAD(&dev->uclass_node);
	dev->platdata = platdata;
	dev->name = name;
	dev->of_offset = of_offset;
	dev->parent = parent;
	dev->driver = drv;
	dev->uclass = uc;

	/*
	 * For some devices, such as a SPI or I2C bus, the 'reg' property
	 * is a reasonable indicator of the sequence number. But if there is
	 * an alias, we use that in preference. In any case, this is just
	 * a 'requested' sequence, and will be resolved (and ->seq updated)
	 * when the device is probed.
	 */
	dev->seq = -1;
#ifdef CONFIG_OF_CONTROL
	dev->req_seq = fdtdec_get_int(gd->fdt_blob, of_offset, "reg", -1);
	if (!IS_ERR_VALUE(dev->req_seq))
		dev->req_seq &= INT_MAX;
	if (uc->uc_drv->name && of_offset != -1) {
		fdtdec_get_alias_seq(gd->fdt_blob, uc->uc_drv->name, of_offset,
				     &dev->req_seq);
	}
#else
	dev->req_seq = -1;
#endif
	if (!dev->platdata && drv->platdata_auto_alloc_size) {
		dev->flags |= DM_FLAG_ALLOC_PDATA;
		dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
		if (!dev->platdata) {
			ret = -ENOMEM;
			goto fail_alloc1;
		}
	}
	if (parent) {
		int size = parent->driver->per_child_platdata_auto_alloc_size;

		if (!size) {
			size = parent->uclass->uc_drv->
					per_child_platdata_auto_alloc_size;
		}
		if (size) {
			dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
			dev->parent_platdata = calloc(1, size);
			if (!dev->parent_platdata) {
				ret = -ENOMEM;
				goto fail_alloc2;
			}
		}
	}

	/* put dev into parent's successor list */
	if (parent)
		list_add_tail(&dev->sibling_node, &parent->child_head);

	ret = uclass_bind_device(dev);
	if (ret)
		goto fail_uclass_bind;

	/* if we fail to bind we remove device from successors and free it */
	if (drv->bind) {
		ret = drv->bind(dev);
		if (ret)
			goto fail_bind;
	}
	if (parent && parent->driver->child_post_bind) {
		ret = parent->driver->child_post_bind(dev);
		if (ret)
			goto fail_child_post_bind;
	}

	if (parent)
		dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
	*devp = dev;

	return 0;

fail_child_post_bind:
	if (drv->unbind && drv->unbind(dev)) {
		dm_warn("unbind() method failed on dev '%s' on error path\n",
			dev->name);
	}

fail_bind:
	if (uclass_unbind_device(dev)) {
		dm_warn("Failed to unbind dev '%s' on error path\n",
			dev->name);
	}
fail_uclass_bind:
	list_del(&dev->sibling_node);
	if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
		free(dev->parent_platdata);
		dev->parent_platdata = NULL;
	}
fail_alloc2:
	if (dev->flags & DM_FLAG_ALLOC_PDATA) {
		free(dev->platdata);
		dev->platdata = NULL;
	}
fail_alloc1:
	free(dev);

	return ret;
}

int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
			const struct driver_info *info, struct udevice **devp)
{
	struct driver *drv;

	drv = lists_driver_lookup_name(info->name);
	if (!drv)
		return -ENOENT;
	if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
		return -EPERM;

	return device_bind(parent, drv, info->name, (void *)info->platdata,
			   -1, devp);
}

int device_probe_child(struct udevice *dev, void *parent_priv)
{
	struct driver *drv;
	int size = 0;
	int ret;
	int seq;

	if (!dev)
		return -EINVAL;

	if (dev->flags & DM_FLAG_ACTIVATED)
		return 0;

	drv = dev->driver;
	assert(drv);

	/* Allocate private data if requested */
	if (drv->priv_auto_alloc_size) {
		dev->priv = calloc(1, drv->priv_auto_alloc_size);
		if (!dev->priv) {
			ret = -ENOMEM;
			goto fail;
		}
	}
	/* Allocate private data if requested */
	size = dev->uclass->uc_drv->per_device_auto_alloc_size;
	if (size) {
		dev->uclass_priv = calloc(1, size);
		if (!dev->uclass_priv) {
			ret = -ENOMEM;
			goto fail;
		}
	}

	/* Ensure all parents are probed */
	if (dev->parent) {
		size = dev->parent->driver->per_child_auto_alloc_size;
		if (size) {
			dev->parent_priv = calloc(1, size);
			if (!dev->parent_priv) {
				ret = -ENOMEM;
				goto fail;
			}
			if (parent_priv)
				memcpy(dev->parent_priv, parent_priv, size);
		}

		ret = device_probe(dev->parent);
		if (ret)
			goto fail;
	}

	seq = uclass_resolve_seq(dev);
	if (seq < 0) {
		ret = seq;
		goto fail;
	}
	dev->seq = seq;

	if (dev->parent && dev->parent->driver->child_pre_probe) {
		ret = dev->parent->driver->child_pre_probe(dev);
		if (ret)
			goto fail;
	}

	if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
		ret = drv->ofdata_to_platdata(dev);
		if (ret)
			goto fail;
	}

	if (drv->probe) {
		ret = drv->probe(dev);
		if (ret)
			goto fail;
	}

	dev->flags |= DM_FLAG_ACTIVATED;

	ret = uclass_post_probe_device(dev);
	if (ret) {
		dev->flags &= ~DM_FLAG_ACTIVATED;
		goto fail_uclass;
	}

	return 0;
fail_uclass:
	if (device_remove(dev)) {
		dm_warn("%s: Device '%s' failed to remove on error path\n",
			__func__, dev->name);
	}
fail:
	dev->seq = -1;
	device_free(dev);

	return ret;
}

int device_probe(struct udevice *dev)
{
	return device_probe_child(dev, NULL);
}

void *dev_get_platdata(struct udevice *dev)
{
	if (!dev) {
		dm_warn("%s: null device\n", __func__);
		return NULL;
	}

	return dev->platdata;
}

void *dev_get_parent_platdata(struct udevice *dev)
{
	if (!dev) {
		dm_warn("%s: null device", __func__);
		return NULL;
	}

	return dev->parent_platdata;
}

void *dev_get_priv(struct udevice *dev)
{
	if (!dev) {
		dm_warn("%s: null device\n", __func__);
		return NULL;
	}

	return dev->priv;
}

void *dev_get_parentdata(struct udevice *dev)
{
	if (!dev) {
		dm_warn("%s: null device\n", __func__);
		return NULL;
	}

	return dev->parent_priv;
}

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

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

	*devp = dev;

	return 0;
}

int device_get_child(struct udevice *parent, int index, struct udevice **devp)
{
	struct udevice *dev;

	list_for_each_entry(dev, &parent->child_head, sibling_node) {
		if (!index--)
			return device_get_device_tail(dev, 0, devp);
	}

	return -ENODEV;
}

int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
			     bool find_req_seq, struct udevice **devp)
{
	struct udevice *dev;

	*devp = NULL;
	if (seq_or_req_seq == -1)
		return -ENODEV;

	list_for_each_entry(dev, &parent->child_head, sibling_node) {
		if ((find_req_seq ? dev->req_seq : dev->seq) ==
				seq_or_req_seq) {
			*devp = dev;
			return 0;
		}
	}

	return -ENODEV;
}

int device_get_child_by_seq(struct udevice *parent, int seq,
			    struct udevice **devp)
{
	struct udevice *dev;
	int ret;

	*devp = NULL;
	ret = device_find_child_by_seq(parent, 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 = device_find_child_by_seq(parent, seq, true, &dev);
	}
	return device_get_device_tail(dev, ret, devp);
}

int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
				   struct udevice **devp)
{
	struct udevice *dev;

	*devp = NULL;

	list_for_each_entry(dev, &parent->child_head, sibling_node) {
		if (dev->of_offset == of_offset) {
			*devp = dev;
			return 0;
		}
	}

	return -ENODEV;
}

int device_get_child_by_of_offset(struct udevice *parent, int seq,
				  struct udevice **devp)
{
	struct udevice *dev;
	int ret;

	*devp = NULL;
	ret = device_find_child_by_of_offset(parent, seq, &dev);
	return device_get_device_tail(dev, ret, devp);
}

int device_find_first_child(struct udevice *parent, struct udevice **devp)
{
	if (list_empty(&parent->child_head)) {
		*devp = NULL;
	} else {
		*devp = list_first_entry(&parent->child_head, struct udevice,
					 sibling_node);
	}

	return 0;
}

int device_find_next_child(struct udevice **devp)
{
	struct udevice *dev = *devp;
	struct udevice *parent = dev->parent;

	if (list_is_last(&dev->sibling_node, &parent->child_head)) {
		*devp = NULL;
	} else {
		*devp = list_entry(dev->sibling_node.next, struct udevice,
				   sibling_node);
	}

	return 0;
}

struct udevice *dev_get_parent(struct udevice *child)
{
	return child->parent;
}

ulong dev_get_of_data(struct udevice *dev)
{
	return dev->of_id->data;
}
Commit	Line	Data
6494d708 SG	1	/*
	2	* Device manager
	3	*
	4	* Copyright (c) 2013 Google, Inc
	5	*
	6	* (C) Copyright 2012
	7	* Pavel Herrmann <[email protected]>
	8	*
	9	* SPDX-License-Identifier: GPL-2.0+
	10	*/
	11
	12	#include <common.h>
5a66a8ff	13	#include <fdtdec.h>
6494d708 SG	14	#include <malloc.h>
	15	#include <dm/device.h>
	16	#include <dm/device-internal.h>
	17	#include <dm/lists.h>
	18	#include <dm/platdata.h>
	19	#include <dm/uclass.h>
	20	#include <dm/uclass-internal.h>
	21	#include <dm/util.h>
	22	#include <linux/err.h>
	23	#include <linux/list.h>
	24
5a66a8ff SG	25	DECLARE_GLOBAL_DATA_PTR;
5a66a8ff SG	26
54c5d08a HS	27	int device_bind(struct udevice parent, struct driver drv, const char *name,
54c5d08a HS	28	void platdata, int of_offset, struct udevice *devp)
6494d708	29	{
54c5d08a	30	struct udevice *dev;
6494d708 SG	31	struct uclass *uc;
	32	int ret = 0;
	33
	34	*devp = NULL;
	35	if (!name)
	36	return -EINVAL;
	37
	38	ret = uclass_get(drv->id, &uc);
	39	if (ret)
	40	return ret;
	41
54c5d08a	42	dev = calloc(1, sizeof(struct udevice));
6494d708 SG	43	if (!dev)
	44	return -ENOMEM;
	45
	46	INIT_LIST_HEAD(&dev->sibling_node);
	47	INIT_LIST_HEAD(&dev->child_head);
	48	INIT_LIST_HEAD(&dev->uclass_node);
	49	dev->platdata = platdata;
	50	dev->name = name;
	51	dev->of_offset = of_offset;
	52	dev->parent = parent;
	53	dev->driver = drv;
	54	dev->uclass = uc;
5a66a8ff SG	55
	56	/*
	57	* For some devices, such as a SPI or I2C bus, the 'reg' property
	58	* is a reasonable indicator of the sequence number. But if there is
	59	* an alias, we use that in preference. In any case, this is just
	60	* a 'requested' sequence, and will be resolved (and ->seq updated)
	61	* when the device is probed.
	62	*/
5a66a8ff	63	dev->seq = -1;
91cbd792 SG	64	#ifdef CONFIG_OF_CONTROL
91cbd792 SG	65	dev->req_seq = fdtdec_get_int(gd->fdt_blob, of_offset, "reg", -1);
cae025aa RB	66	if (!IS_ERR_VALUE(dev->req_seq))
cae025aa RB	67	dev->req_seq &= INT_MAX;
5a66a8ff SG	68	if (uc->uc_drv->name && of_offset != -1) {
	69	fdtdec_get_alias_seq(gd->fdt_blob, uc->uc_drv->name, of_offset,
	70	&dev->req_seq);
	71	}
91cbd792 SG	72	#else
	73	dev->req_seq = -1;
	74	#endif
f8a85449	75	if (!dev->platdata && drv->platdata_auto_alloc_size) {
6494d708	76	dev->flags \|= DM_FLAG_ALLOC_PDATA;
f8a85449 SG	77	dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
	78	if (!dev->platdata) {
	79	ret = -ENOMEM;
	80	goto fail_alloc1;
	81	}
	82	}
cdc133bd SG	83	if (parent) {
	84	int size = parent->driver->per_child_platdata_auto_alloc_size;
	85
ba8da9dc SG	86	if (!size) {
	87	size = parent->uclass->uc_drv->
	88	per_child_platdata_auto_alloc_size;
	89	}
cdc133bd SG	90	if (size) {
	91	dev->flags \|= DM_FLAG_ALLOC_PARENT_PDATA;
	92	dev->parent_platdata = calloc(1, size);
	93	if (!dev->parent_platdata) {
	94	ret = -ENOMEM;
	95	goto fail_alloc2;
	96	}
	97	}
	98	}
6494d708 SG	99
	100	/* put dev into parent's successor list */
	101	if (parent)
	102	list_add_tail(&dev->sibling_node, &parent->child_head);
	103
	104	ret = uclass_bind_device(dev);
	105	if (ret)
72ebfe86	106	goto fail_uclass_bind;
6494d708 SG	107
	108	/* if we fail to bind we remove device from successors and free it */
	109	if (drv->bind) {
	110	ret = drv->bind(dev);
72ebfe86	111	if (ret)
6494d708	112	goto fail_bind;
6494d708	113	}
0118ce79 SG	114	if (parent && parent->driver->child_post_bind) {
	115	ret = parent->driver->child_post_bind(dev);
	116	if (ret)
	117	goto fail_child_post_bind;
	118	}
	119
6494d708 SG	120	if (parent)
	121	dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
	122	*devp = dev;
	123
	124	return 0;
	125
0118ce79 SG	126	fail_child_post_bind:
	127	if (drv->unbind && drv->unbind(dev)) {
	128	dm_warn("unbind() method failed on dev '%s' on error path\n",
	129	dev->name);
	130	}
	131
6494d708	132	fail_bind:
72ebfe86 SG	133	if (uclass_unbind_device(dev)) {
	134	dm_warn("Failed to unbind dev '%s' on error path\n",
	135	dev->name);
	136	}
	137	fail_uclass_bind:
cdc133bd SG	138	list_del(&dev->sibling_node);
	139	if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
	140	free(dev->parent_platdata);
	141	dev->parent_platdata = NULL;
	142	}
	143	fail_alloc2:
f8a85449 SG	144	if (dev->flags & DM_FLAG_ALLOC_PDATA) {
	145	free(dev->platdata);
	146	dev->platdata = NULL;
	147	}
	148	fail_alloc1:
6494d708	149	free(dev);
72ebfe86	150
6494d708 SG	151	return ret;
	152	}
	153
00606d7e SG	154	int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
00606d7e SG	155	const struct driver_info info, struct udevice *devp)
6494d708 SG	156	{
	157	struct driver *drv;
	158
	159	drv = lists_driver_lookup_name(info->name);
	160	if (!drv)
	161	return -ENOENT;
00606d7e SG	162	if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
00606d7e SG	163	return -EPERM;
6494d708 SG	164
	165	return device_bind(parent, drv, info->name, (void *)info->platdata,
	166	-1, devp);
	167	}
	168
accd4b19	169	int device_probe_child(struct udevice dev, void parent_priv)
6494d708 SG	170	{
	171	struct driver *drv;
	172	int size = 0;
	173	int ret;
5a66a8ff	174	int seq;
6494d708 SG	175
	176	if (!dev)
	177	return -EINVAL;
	178
	179	if (dev->flags & DM_FLAG_ACTIVATED)
	180	return 0;
	181
	182	drv = dev->driver;
	183	assert(drv);
	184
f8a85449	185	/* Allocate private data if requested */
6494d708 SG	186	if (drv->priv_auto_alloc_size) {
	187	dev->priv = calloc(1, drv->priv_auto_alloc_size);
	188	if (!dev->priv) {
	189	ret = -ENOMEM;
	190	goto fail;
	191	}
	192	}
	193	/* Allocate private data if requested */
6494d708 SG	194	size = dev->uclass->uc_drv->per_device_auto_alloc_size;
	195	if (size) {
	196	dev->uclass_priv = calloc(1, size);
	197	if (!dev->uclass_priv) {
	198	ret = -ENOMEM;
	199	goto fail;
	200	}
	201	}
	202
	203	/* Ensure all parents are probed */
	204	if (dev->parent) {
e59f458d SG	205	size = dev->parent->driver->per_child_auto_alloc_size;
	206	if (size) {
	207	dev->parent_priv = calloc(1, size);
	208	if (!dev->parent_priv) {
	209	ret = -ENOMEM;
	210	goto fail;
	211	}
accd4b19 SG	212	if (parent_priv)
accd4b19 SG	213	memcpy(dev->parent_priv, parent_priv, size);
e59f458d SG	214	}
e59f458d SG	215
6494d708 SG	216	ret = device_probe(dev->parent);
	217	if (ret)
	218	goto fail;
	219	}
	220
5a66a8ff SG	221	seq = uclass_resolve_seq(dev);
	222	if (seq < 0) {
	223	ret = seq;
	224	goto fail;
	225	}
	226	dev->seq = seq;
	227
a327dee0 SG	228	if (dev->parent && dev->parent->driver->child_pre_probe) {
	229	ret = dev->parent->driver->child_pre_probe(dev);
	230	if (ret)
	231	goto fail;
	232	}
	233
6494d708 SG	234	if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
	235	ret = drv->ofdata_to_platdata(dev);
	236	if (ret)
	237	goto fail;
	238	}
	239
	240	if (drv->probe) {
	241	ret = drv->probe(dev);
	242	if (ret)
	243	goto fail;
	244	}
	245
	246	dev->flags \|= DM_FLAG_ACTIVATED;
	247
	248	ret = uclass_post_probe_device(dev);
	249	if (ret) {
	250	dev->flags &= ~DM_FLAG_ACTIVATED;
	251	goto fail_uclass;
	252	}
	253
	254	return 0;
	255	fail_uclass:
	256	if (device_remove(dev)) {
	257	dm_warn("%s: Device '%s' failed to remove on error path\n",
	258	__func__, dev->name);
	259	}
	260	fail:
5a66a8ff	261	dev->seq = -1;
6494d708 SG	262	device_free(dev);
	263
	264	return ret;
	265	}
	266
accd4b19 SG	267	int device_probe(struct udevice *dev)
	268	{
	269	return device_probe_child(dev, NULL);
	270	}
	271
54c5d08a	272	void dev_get_platdata(struct udevice dev)
6494d708 SG	273	{
6494d708 SG	274	if (!dev) {
964d153c	275	dm_warn("%s: null device\n", __func__);
6494d708 SG	276	return NULL;
	277	}
	278
	279	return dev->platdata;
	280	}
	281
cdc133bd SG	282	void dev_get_parent_platdata(struct udevice dev)
	283	{
	284	if (!dev) {
	285	dm_warn("%s: null device", __func__);
	286	return NULL;
	287	}
	288
	289	return dev->parent_platdata;
	290	}
	291
54c5d08a	292	void dev_get_priv(struct udevice dev)
6494d708 SG	293	{
6494d708 SG	294	if (!dev) {
964d153c	295	dm_warn("%s: null device\n", __func__);
6494d708 SG	296	return NULL;
	297	}
	298
	299	return dev->priv;
	300	}
997c87bb	301
e59f458d SG	302	void dev_get_parentdata(struct udevice dev)
	303	{
	304	if (!dev) {
964d153c	305	dm_warn("%s: null device\n", __func__);
e59f458d SG	306	return NULL;
	307	}
	308
	309	return dev->parent_priv;
	310	}
	311
997c87bb SG	312	static int device_get_device_tail(struct udevice *dev, int ret,
	313	struct udevice **devp)
	314	{
	315	if (ret)
	316	return ret;
	317
	318	ret = device_probe(dev);
	319	if (ret)
	320	return ret;
	321
	322	*devp = dev;
	323
	324	return 0;
	325	}
	326
	327	int device_get_child(struct udevice parent, int index, struct udevice *devp)
	328	{
	329	struct udevice *dev;
	330
	331	list_for_each_entry(dev, &parent->child_head, sibling_node) {
	332	if (!index--)
	333	return device_get_device_tail(dev, 0, devp);
	334	}
	335
	336	return -ENODEV;
	337	}
	338
	339	int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
	340	bool find_req_seq, struct udevice **devp)
	341	{
	342	struct udevice *dev;
	343
	344	*devp = NULL;
	345	if (seq_or_req_seq == -1)
	346	return -ENODEV;
	347
	348	list_for_each_entry(dev, &parent->child_head, sibling_node) {
	349	if ((find_req_seq ? dev->req_seq : dev->seq) ==
	350	seq_or_req_seq) {
	351	*devp = dev;
	352	return 0;
	353	}
	354	}
	355
	356	return -ENODEV;
	357	}
	358
	359	int device_get_child_by_seq(struct udevice *parent, int seq,
	360	struct udevice **devp)
	361	{
	362	struct udevice *dev;
	363	int ret;
	364
	365	*devp = NULL;
	366	ret = device_find_child_by_seq(parent, seq, false, &dev);
	367	if (ret == -ENODEV) {
	368	/*
	369	* We didn't find it in probed devices. See if there is one
	370	* that will request this seq if probed.
	371	*/
	372	ret = device_find_child_by_seq(parent, seq, true, &dev);
	373	}
	374	return device_get_device_tail(dev, ret, devp);
	375	}
376
377	int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
378	struct udevice **devp)
379	{
380	struct udevice *dev;
381
382	*devp = NULL;
383
384	list_for_each_entry(dev, &parent->child_head, sibling_node) {
385	if (dev->of_offset == of_offset) {
386	*devp = dev;
387	return 0;
388	}
389	}
390
391	return -ENODEV;
392	}
393
394	int device_get_child_by_of_offset(struct udevice *parent, int seq,
395	struct udevice **devp)
396	{
397	struct udevice *dev;
398	int ret;
399
400	*devp = NULL;
401	ret = device_find_child_by_of_offset(parent, seq, &dev);
402	return device_get_device_tail(dev, ret, devp);
403	}
a8981d4f SG	404
	405	int device_find_first_child(struct udevice parent, struct udevice *devp)
	406	{
	407	if (list_empty(&parent->child_head)) {
	408	*devp = NULL;
	409	} else {
	410	*devp = list_first_entry(&parent->child_head, struct udevice,
	411	sibling_node);
	412	}
	413
	414	return 0;
	415	}
	416
	417	int device_find_next_child(struct udevice **devp)
	418	{
	419	struct udevice dev = devp;
	420	struct udevice *parent = dev->parent;
	421
	422	if (list_is_last(&dev->sibling_node, &parent->child_head)) {
	423	*devp = NULL;
	424	} else {
	425	*devp = list_entry(dev->sibling_node.next, struct udevice,
	426	sibling_node);
	427	}
	428
	429	return 0;
	430	}
2ef249b4	431
479728cb SG	432	struct udevice dev_get_parent(struct udevice child)
	433	{
	434	return child->parent;
	435	}
	436
2ef249b4 SG	437	ulong dev_get_of_data(struct udevice *dev)
	438	{
	439	return dev->of_id->data;
	440	}