[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;

	dev->seq = -1;
	dev->req_seq = -1;
#ifdef CONFIG_OF_CONTROL
	/*
	 * Some devices, such as a SPI bus, I2C bus and serial ports are
	 * numbered using aliases.
	 *
	 * This is just a 'requested' sequence, and will be
	 * resolved (and ->seq updated) when the device is probed.
	 */
	if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
		if (uc->uc_drv->name && of_offset != -1) {
			fdtdec_get_alias_seq(gd->fdt_blob, uc->uc_drv->name,
					     of_offset, &dev->req_seq);
		}
	}
#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;
}

enum uclass_id device_get_uclass_id(struct udevice *dev)
{
	return dev->uclass->uc_drv->id;
}
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	55
5a66a8ff	56	dev->seq = -1;
9cc36a2b	57	dev->req_seq = -1;
91cbd792	58	#ifdef CONFIG_OF_CONTROL
9cc36a2b SG	59	/*
	60	* Some devices, such as a SPI bus, I2C bus and serial ports are
	61	* numbered using aliases.
	62	*
	63	* This is just a 'requested' sequence, and will be
	64	* resolved (and ->seq updated) when the device is probed.
	65	*/
	66	if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
	67	if (uc->uc_drv->name && of_offset != -1) {
	68	fdtdec_get_alias_seq(gd->fdt_blob, uc->uc_drv->name,
	69	of_offset, &dev->req_seq);
	70	}
5a66a8ff	71	}
91cbd792	72	#endif
f8a85449	73	if (!dev->platdata && drv->platdata_auto_alloc_size) {
6494d708	74	dev->flags \|= DM_FLAG_ALLOC_PDATA;
f8a85449 SG	75	dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
	76	if (!dev->platdata) {
	77	ret = -ENOMEM;
	78	goto fail_alloc1;
	79	}
	80	}
cdc133bd SG	81	if (parent) {
	82	int size = parent->driver->per_child_platdata_auto_alloc_size;
	83
ba8da9dc SG	84	if (!size) {
	85	size = parent->uclass->uc_drv->
	86	per_child_platdata_auto_alloc_size;
	87	}
cdc133bd SG	88	if (size) {
	89	dev->flags \|= DM_FLAG_ALLOC_PARENT_PDATA;
	90	dev->parent_platdata = calloc(1, size);
	91	if (!dev->parent_platdata) {
	92	ret = -ENOMEM;
	93	goto fail_alloc2;
	94	}
	95	}
	96	}
6494d708 SG	97
	98	/* put dev into parent's successor list */
	99	if (parent)
	100	list_add_tail(&dev->sibling_node, &parent->child_head);
	101
	102	ret = uclass_bind_device(dev);
	103	if (ret)
72ebfe86	104	goto fail_uclass_bind;
6494d708 SG	105
	106	/* if we fail to bind we remove device from successors and free it */
	107	if (drv->bind) {
	108	ret = drv->bind(dev);
72ebfe86	109	if (ret)
6494d708	110	goto fail_bind;
6494d708	111	}
0118ce79 SG	112	if (parent && parent->driver->child_post_bind) {
	113	ret = parent->driver->child_post_bind(dev);
	114	if (ret)
	115	goto fail_child_post_bind;
	116	}
	117
6494d708 SG	118	if (parent)
	119	dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
	120	*devp = dev;
	121
	122	return 0;
	123
0118ce79 SG	124	fail_child_post_bind:
	125	if (drv->unbind && drv->unbind(dev)) {
	126	dm_warn("unbind() method failed on dev '%s' on error path\n",
	127	dev->name);
	128	}
	129
6494d708	130	fail_bind:
72ebfe86 SG	131	if (uclass_unbind_device(dev)) {
	132	dm_warn("Failed to unbind dev '%s' on error path\n",
	133	dev->name);
	134	}
	135	fail_uclass_bind:
cdc133bd SG	136	list_del(&dev->sibling_node);
	137	if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
	138	free(dev->parent_platdata);
	139	dev->parent_platdata = NULL;
	140	}
	141	fail_alloc2:
f8a85449 SG	142	if (dev->flags & DM_FLAG_ALLOC_PDATA) {
	143	free(dev->platdata);
	144	dev->platdata = NULL;
	145	}
	146	fail_alloc1:
6494d708	147	free(dev);
72ebfe86	148
6494d708 SG	149	return ret;
	150	}
	151
00606d7e SG	152	int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
00606d7e SG	153	const struct driver_info info, struct udevice *devp)
6494d708 SG	154	{
	155	struct driver *drv;
	156
	157	drv = lists_driver_lookup_name(info->name);
	158	if (!drv)
	159	return -ENOENT;
00606d7e SG	160	if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
00606d7e SG	161	return -EPERM;
6494d708 SG	162
	163	return device_bind(parent, drv, info->name, (void *)info->platdata,
	164	-1, devp);
	165	}
	166
accd4b19	167	int device_probe_child(struct udevice dev, void parent_priv)
6494d708 SG	168	{
	169	struct driver *drv;
	170	int size = 0;
	171	int ret;
5a66a8ff	172	int seq;
6494d708 SG	173
	174	if (!dev)
	175	return -EINVAL;
	176
	177	if (dev->flags & DM_FLAG_ACTIVATED)
	178	return 0;
	179
	180	drv = dev->driver;
	181	assert(drv);
	182
f8a85449	183	/* Allocate private data if requested */
6494d708 SG	184	if (drv->priv_auto_alloc_size) {
	185	dev->priv = calloc(1, drv->priv_auto_alloc_size);
	186	if (!dev->priv) {
	187	ret = -ENOMEM;
	188	goto fail;
	189	}
	190	}
	191	/* Allocate private data if requested */
6494d708 SG	192	size = dev->uclass->uc_drv->per_device_auto_alloc_size;
	193	if (size) {
	194	dev->uclass_priv = calloc(1, size);
	195	if (!dev->uclass_priv) {
	196	ret = -ENOMEM;
	197	goto fail;
	198	}
	199	}
	200
	201	/* Ensure all parents are probed */
	202	if (dev->parent) {
e59f458d SG	203	size = dev->parent->driver->per_child_auto_alloc_size;
	204	if (size) {
	205	dev->parent_priv = calloc(1, size);
	206	if (!dev->parent_priv) {
	207	ret = -ENOMEM;
	208	goto fail;
	209	}
accd4b19 SG	210	if (parent_priv)
accd4b19 SG	211	memcpy(dev->parent_priv, parent_priv, size);
e59f458d SG	212	}
e59f458d SG	213
6494d708 SG	214	ret = device_probe(dev->parent);
	215	if (ret)
	216	goto fail;
	217	}
	218
5a66a8ff SG	219	seq = uclass_resolve_seq(dev);
	220	if (seq < 0) {
	221	ret = seq;
	222	goto fail;
	223	}
	224	dev->seq = seq;
	225
a327dee0 SG	226	if (dev->parent && dev->parent->driver->child_pre_probe) {
	227	ret = dev->parent->driver->child_pre_probe(dev);
	228	if (ret)
	229	goto fail;
	230	}
	231
6494d708 SG	232	if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
	233	ret = drv->ofdata_to_platdata(dev);
	234	if (ret)
	235	goto fail;
	236	}
	237
	238	if (drv->probe) {
	239	ret = drv->probe(dev);
	240	if (ret)
	241	goto fail;
	242	}
	243
	244	dev->flags \|= DM_FLAG_ACTIVATED;
	245
	246	ret = uclass_post_probe_device(dev);
	247	if (ret) {
	248	dev->flags &= ~DM_FLAG_ACTIVATED;
	249	goto fail_uclass;
	250	}
	251
	252	return 0;
	253	fail_uclass:
	254	if (device_remove(dev)) {
	255	dm_warn("%s: Device '%s' failed to remove on error path\n",
	256	__func__, dev->name);
	257	}
	258	fail:
5a66a8ff	259	dev->seq = -1;
6494d708 SG	260	device_free(dev);
	261
	262	return ret;
	263	}
	264
accd4b19 SG	265	int device_probe(struct udevice *dev)
	266	{
	267	return device_probe_child(dev, NULL);
	268	}
	269
54c5d08a	270	void dev_get_platdata(struct udevice dev)
6494d708 SG	271	{
6494d708 SG	272	if (!dev) {
964d153c	273	dm_warn("%s: null device\n", __func__);
6494d708 SG	274	return NULL;
	275	}
	276
	277	return dev->platdata;
	278	}
	279
cdc133bd SG	280	void dev_get_parent_platdata(struct udevice dev)
	281	{
	282	if (!dev) {
	283	dm_warn("%s: null device", __func__);
	284	return NULL;
	285	}
	286
	287	return dev->parent_platdata;
	288	}
	289
54c5d08a	290	void dev_get_priv(struct udevice dev)
6494d708 SG	291	{
6494d708 SG	292	if (!dev) {
964d153c	293	dm_warn("%s: null device\n", __func__);
6494d708 SG	294	return NULL;
	295	}
	296
	297	return dev->priv;
	298	}
997c87bb	299
e59f458d SG	300	void dev_get_parentdata(struct udevice dev)
	301	{
	302	if (!dev) {
964d153c	303	dm_warn("%s: null device\n", __func__);
e59f458d SG	304	return NULL;
	305	}
	306
	307	return dev->parent_priv;
	308	}
	309
997c87bb SG	310	static int device_get_device_tail(struct udevice *dev, int ret,
	311	struct udevice **devp)
	312	{
	313	if (ret)
	314	return ret;
	315
	316	ret = device_probe(dev);
	317	if (ret)
	318	return ret;
	319
	320	*devp = dev;
	321
	322	return 0;
	323	}
	324
	325	int device_get_child(struct udevice parent, int index, struct udevice *devp)
	326	{
	327	struct udevice *dev;
	328
	329	list_for_each_entry(dev, &parent->child_head, sibling_node) {
	330	if (!index--)
	331	return device_get_device_tail(dev, 0, devp);
	332	}
	333
	334	return -ENODEV;
	335	}
	336
	337	int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
	338	bool find_req_seq, struct udevice **devp)
	339	{
	340	struct udevice *dev;
	341
	342	*devp = NULL;
	343	if (seq_or_req_seq == -1)
	344	return -ENODEV;
	345
	346	list_for_each_entry(dev, &parent->child_head, sibling_node) {
	347	if ((find_req_seq ? dev->req_seq : dev->seq) ==
	348	seq_or_req_seq) {
	349	*devp = dev;
	350	return 0;
	351	}
	352	}
	353
	354	return -ENODEV;
	355	}
	356
	357	int device_get_child_by_seq(struct udevice *parent, int seq,
	358	struct udevice **devp)
	359	{
	360	struct udevice *dev;
	361	int ret;
	362
	363	*devp = NULL;
	364	ret = device_find_child_by_seq(parent, seq, false, &dev);
	365	if (ret == -ENODEV) {
	366	/*
	367	* We didn't find it in probed devices. See if there is one
	368	* that will request this seq if probed.
	369	*/
	370	ret = device_find_child_by_seq(parent, seq, true, &dev);
	371	}
	372	return device_get_device_tail(dev, ret, devp);
	373	}
374
375	int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
376	struct udevice **devp)
377	{
378	struct udevice *dev;
379
380	*devp = NULL;
381
382	list_for_each_entry(dev, &parent->child_head, sibling_node) {
383	if (dev->of_offset == of_offset) {
384	*devp = dev;
385	return 0;
386	}
387	}
388
389	return -ENODEV;
390	}
391
392	int device_get_child_by_of_offset(struct udevice *parent, int seq,
393	struct udevice **devp)
394	{
395	struct udevice *dev;
396	int ret;
397
398	*devp = NULL;
399	ret = device_find_child_by_of_offset(parent, seq, &dev);
400	return device_get_device_tail(dev, ret, devp);
401	}
a8981d4f SG	402
	403	int device_find_first_child(struct udevice parent, struct udevice *devp)
	404	{
	405	if (list_empty(&parent->child_head)) {
	406	*devp = NULL;
	407	} else {
	408	*devp = list_first_entry(&parent->child_head, struct udevice,
	409	sibling_node);
	410	}
	411
	412	return 0;
	413	}
	414
	415	int device_find_next_child(struct udevice **devp)
	416	{
	417	struct udevice dev = devp;
	418	struct udevice *parent = dev->parent;
	419
	420	if (list_is_last(&dev->sibling_node, &parent->child_head)) {
	421	*devp = NULL;
	422	} else {
	423	*devp = list_entry(dev->sibling_node.next, struct udevice,
	424	sibling_node);
	425	}
	426
	427	return 0;
	428	}
2ef249b4	429
479728cb SG	430	struct udevice dev_get_parent(struct udevice child)
	431	{
	432	return child->parent;
	433	}
	434
2ef249b4 SG	435	ulong dev_get_of_data(struct udevice *dev)
	436	{
	437	return dev->of_id->data;
	438	}
b3670531 SG	439
	440	enum uclass_id device_get_uclass_id(struct udevice *dev)
	441	{
	442	return dev->uclass->uc_drv->id;
	443	}