[deliverable/linux.git] / drivers / of / platform.c

/*
 *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
 *			 <benh@kernel.crashing.org>
 *    and		 Arnd Bergmann, IBM Corp.
 *    Merged from powerpc/kernel/of_platform.c and
 *    sparc{,64}/kernel/of_device.c by Stephen Rothwell
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */
#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 */
};

static int of_dev_node_match(struct device *dev, void *data)
{
	return dev->of_node == data;
}

/**
 * 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)
{
	struct device *dev;

	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);

#if defined(CONFIG_PPC_DCR)
#include <asm/dcr.h>
#endif

#if !defined(CONFIG_SPARC)
/*
 * 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.
 */

/**
 * 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 either the dcr-reg or the reg property
 * value to derive a unique name.  As a last resort it will use the node
 * name followed by a unique number.
 */
void of_device_make_bus_id(struct device *dev)
{
	static atomic_t bus_no_reg_magic;
	struct device_node *node = dev->of_node;
	const u32 *reg;
	u64 addr;
	int magic;

#ifdef CONFIG_PPC_DCR
	/*
	 * If it's a DCR based device, use 'd' for native DCRs
	 * and 'D' for MMIO DCRs.
	 */
	reg = of_get_property(node, "dcr-reg", NULL);
	if (reg) {
#ifdef CONFIG_PPC_DCR_NATIVE
		dev_set_name(dev, "d%x.%s", *reg, node->name);
#else /* CONFIG_PPC_DCR_NATIVE */
		u64 addr = of_translate_dcr_address(node, *reg, NULL);
		if (addr != OF_BAD_ADDR) {
			dev_set_name(dev, "D%llx.%s",
				     (unsigned long long)addr, node->name);
			return;
		}
#endif /* !CONFIG_PPC_DCR_NATIVE */
	}
#endif /* CONFIG_PPC_DCR */

	/*
	 * For MMIO, get the physical address
	 */
	reg = of_get_property(node, "reg", NULL);
	if (reg) {
		addr = of_translate_address(node, reg);
		if (addr != OF_BAD_ADDR) {
			dev_set_name(dev, "%llx.%s",
				     (unsigned long long)addr, node->name);
			return;
		}
	}

	/*
	 * No BusID, use the node name and add a globally incremented
	 * counter (and pray...)
	 */
	magic = atomic_add_return(1, &bus_no_reg_magic);
	dev_set_name(dev, "%s.%d", node->name, magic - 1);
}

/**
 * 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 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);
		}
		WARN_ON(of_irq_to_resource_table(np, res, num_irq) != num_irq);
	}

	dev->dev.of_node = of_node_get(np);
#if defined(CONFIG_PPC) || defined(CONFIG_MICROBLAZE)
	dev->dev.dma_mask = &dev->archdata.dma_mask;
#endif
	dev->dev.parent = parent;

	if (bus_id)
		dev_set_name(&dev->dev, "%s", bus_id);
	else
		of_device_make_bus_id(&dev->dev);

	return dev;
}
EXPORT_SYMBOL(of_device_alloc);

/**
 * 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 platform_device *dev;

	if (!of_device_is_available(np))
		return NULL;

	dev = of_device_alloc(np, bus_id, parent);
	if (!dev)
		return NULL;

#if defined(CONFIG_PPC) || defined(CONFIG_MICROBLAZE)
	dev->archdata.dma_mask = 0xffffffffUL;
#endif
	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
	dev->dev.bus = &platform_bus_type;

	/* 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 (of_device_add(dev) != 0) {
		platform_device_put(dev);
		return NULL;
	}

	return dev;
}
EXPORT_SYMBOL(of_platform_device_create);

#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 amba_device *dev;
	const void *prop;
	int i, ret;

	pr_debug("Creating amba device %s\n", node->full_name);

	if (!of_device_is_available(node))
		return NULL;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return 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);

	/* setup amba-specific device info */
	dev->dma_mask = ~0;

	/* 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)
		goto err_free;

	ret = amba_device_register(dev, &iomem_resource);
	if (ret)
		goto err_free;

	return dev;

err_free:
	kfree(dev);
	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)
{
	return NULL;
}
#endif /* CONFIG_ARM_AMBA */

/**
 * 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
 * disallow recursive creation of child buses
 * @parent: parent for new device, or NULL for top level.
 *
 * 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,
				  struct device *parent, bool strict)
{
	struct device_node *child;
	struct platform_device *dev;
	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 (of_device_is_compatible(bus, "arm,primecell")) {
		of_amba_device_create(bus, NULL, NULL, parent);
		return 0;
	}

	dev = of_platform_device_create(bus, NULL, parent);
	if (!dev || !of_match_node(matches, bus))
		return 0;

	for_each_child_of_node(bus, child) {
		pr_debug("   create child: %s\n", child->full_name);
		rc = of_platform_bus_create(child, matches, &dev->dev, strict);
		if (rc) {
			of_node_put(child);
			break;
		}
	}
	return rc;
}

/**
 * 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_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, parent, false);
	} else for_each_child_of_node(root, child) {
		if (!of_match_node(matches, child))
			continue;
		rc = of_platform_bus_create(child, matches, parent, false);
		if (rc)
			break;
	}

	of_node_put(root);
	return rc;
}
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
 * @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,
			struct device *parent)
{
	struct device_node *child;
	int rc = 0;

	root = root ? of_node_get(root) : of_find_node_by_path("/");
	if (!root)
		return -EINVAL;

	for_each_child_of_node(root, child) {
		rc = of_platform_bus_create(child, matches, parent, true);
		if (rc)
			break;
	}

	of_node_put(root);
	return rc;
}
#endif /* !CONFIG_SPARC */
Commit	Line	Data
3f23de10 SR	1	/*
	2	* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
	3	* <benh@kernel.crashing.org>
	4	* and Arnd Bergmann, IBM Corp.
	5	* Merged from powerpc/kernel/of_platform.c and
	6	* sparc{,64}/kernel/of_device.c by Stephen Rothwell
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*
	13	*/
	14	#include <linux/errno.h>
5c457083	15	#include <linux/module.h>
5de1540b	16	#include <linux/amba/bus.h>
3f23de10	17	#include <linux/device.h>
5fd200f3	18	#include <linux/dma-mapping.h>
50ef5284	19	#include <linux/slab.h>
9e3288dc	20	#include <linux/of_address.h>
3f23de10	21	#include <linux/of_device.h>
9e3288dc	22	#include <linux/of_irq.h>
3f23de10	23	#include <linux/of_platform.h>
eca39301 GL	24	#include <linux/platform_device.h>
eca39301 GL	25
cbb49c26 GL	26	const struct of_device_id of_default_bus_match_table[] = {
	27	{ .compatible = "simple-bus", },
	28	#ifdef CONFIG_ARM_AMBA
	29	{ .compatible = "arm,amba-bus", },
	30	#endif /* CONFIG_ARM_AMBA */
	31	{} /* Empty terminated list */
	32	};
	33
c6085584 JB	34	static int of_dev_node_match(struct device dev, void data)
	35	{
	36	return dev->of_node == data;
	37	}
	38
	39	/**
	40	* of_find_device_by_node - Find the platform_device associated with a node
	41	* @np: Pointer to device tree node
	42	*
	43	* Returns platform_device pointer, or NULL if not found
	44	*/
	45	struct platform_device of_find_device_by_node(struct device_node np)
	46	{
	47	struct device *dev;
	48
	49	dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
	50	return dev ? to_platform_device(dev) : NULL;
	51	}
	52	EXPORT_SYMBOL(of_find_device_by_node);
	53
596c955c GL	54	#if defined(CONFIG_PPC_DCR)
	55	#include <asm/dcr.h>
	56	#endif
	57
5fd200f3 GL	58	#if !defined(CONFIG_SPARC)
	59	/*
	60	* The following routines scan a subtree and registers a device for
	61	* each applicable node.
	62	*
	63	* Note: sparc doesn't use these routines because it has a different
	64	* mechanism for creating devices from device tree nodes.
	65	*/
	66
94c09319 GL	67	/**
	68	* of_device_make_bus_id - Use the device node data to assign a unique name
	69	* @dev: pointer to device structure that is linked to a device tree node
	70	*
	71	* This routine will first try using either the dcr-reg or the reg property
	72	* value to derive a unique name. As a last resort it will use the node
	73	* name followed by a unique number.
	74	*/
c6601225	75	void of_device_make_bus_id(struct device *dev)
94c09319 GL	76	{
	77	static atomic_t bus_no_reg_magic;
	78	struct device_node *node = dev->of_node;
	79	const u32 *reg;
	80	u64 addr;
	81	int magic;
	82
	83	#ifdef CONFIG_PPC_DCR
	84	/*
	85	* If it's a DCR based device, use 'd' for native DCRs
	86	* and 'D' for MMIO DCRs.
	87	*/
	88	reg = of_get_property(node, "dcr-reg", NULL);
	89	if (reg) {
	90	#ifdef CONFIG_PPC_DCR_NATIVE
	91	dev_set_name(dev, "d%x.%s", *reg, node->name);
	92	#else /* CONFIG_PPC_DCR_NATIVE */
	93	u64 addr = of_translate_dcr_address(node, *reg, NULL);
	94	if (addr != OF_BAD_ADDR) {
	95	dev_set_name(dev, "D%llx.%s",
	96	(unsigned long long)addr, node->name);
	97	return;
	98	}
	99	#endif /* !CONFIG_PPC_DCR_NATIVE */
	100	}
	101	#endif /* CONFIG_PPC_DCR */
	102
	103	/*
	104	* For MMIO, get the physical address
	105	*/
	106	reg = of_get_property(node, "reg", NULL);
	107	if (reg) {
	108	addr = of_translate_address(node, reg);
	109	if (addr != OF_BAD_ADDR) {
	110	dev_set_name(dev, "%llx.%s",
	111	(unsigned long long)addr, node->name);
	112	return;
	113	}
	114	}
	115
	116	/*
	117	* No BusID, use the node name and add a globally incremented
	118	* counter (and pray...)
	119	*/
	120	magic = atomic_add_return(1, &bus_no_reg_magic);
	121	dev_set_name(dev, "%s.%d", node->name, magic - 1);
	122	}
	123
	124	/**
	125	* of_device_alloc - Allocate and initialize an of_device
	126	* @np: device node to assign to device
	127	* @bus_id: Name to assign to the device. May be null to use default name.
	128	* @parent: Parent device.
	129	*/
94a0cb1f	130	struct platform_device of_device_alloc(struct device_node np,
94c09319 GL	131	const char *bus_id,
	132	struct device *parent)
	133	{
94a0cb1f	134	struct platform_device *dev;
52f6537c	135	int rc, i, num_reg = 0, num_irq;
ac80a51e GL	136	struct resource *res, temp_res;
ac80a51e GL	137
7096d042 GL	138	dev = platform_device_alloc("", -1);
	139	if (!dev)
	140	return NULL;
	141
	142	/* count the io and irq resources */
ac80a51e GL	143	while (of_address_to_resource(np, num_reg, &temp_res) == 0)
ac80a51e GL	144	num_reg++;
52f6537c	145	num_irq = of_irq_count(np);
ac80a51e	146
ac80a51e GL	147	/* Populate the resource table */
ac80a51e GL	148	if (num_irq \|\| num_reg) {
7096d042 GL	149	res = kzalloc(sizeof(res) (num_irq + num_reg), GFP_KERNEL);
	150	if (!res) {
	151	platform_device_put(dev);
	152	return NULL;
	153	}
	154
ac80a51e GL	155	dev->num_resources = num_reg + num_irq;
	156	dev->resource = res;
	157	for (i = 0; i < num_reg; i++, res++) {
	158	rc = of_address_to_resource(np, i, res);
	159	WARN_ON(rc);
	160	}
52f6537c	161	WARN_ON(of_irq_to_resource_table(np, res, num_irq) != num_irq);
ac80a51e	162	}
94c09319 GL	163
94c09319 GL	164	dev->dev.of_node = of_node_get(np);
9e3288dc	165	#if defined(CONFIG_PPC) \|\| defined(CONFIG_MICROBLAZE)
94c09319	166	dev->dev.dma_mask = &dev->archdata.dma_mask;
9e3288dc	167	#endif
94c09319	168	dev->dev.parent = parent;
94c09319 GL	169
	170	if (bus_id)
	171	dev_set_name(&dev->dev, "%s", bus_id);
	172	else
	173	of_device_make_bus_id(&dev->dev);
	174
	175	return dev;
	176	}
	177	EXPORT_SYMBOL(of_device_alloc);
	178
5fd200f3 GL	179	/**
	180	* of_platform_device_create - Alloc, initialize and register an of_device
	181	* @np: pointer to node to create device for
	182	* @bus_id: name to assign device
	183	* @parent: Linux device model parent device.
cd1e6504 GL	184	*
	185	* Returns pointer to created platform device, or NULL if a device was not
	186	* registered. Unavailable devices will not get registered.
5fd200f3	187	*/
94a0cb1f	188	struct platform_device of_platform_device_create(struct device_node np,
5fd200f3 GL	189	const char *bus_id,
	190	struct device *parent)
	191	{
94a0cb1f	192	struct platform_device *dev;
5fd200f3	193
cd1e6504 GL	194	if (!of_device_is_available(np))
	195	return NULL;
	196
5fd200f3 GL	197	dev = of_device_alloc(np, bus_id, parent);
	198	if (!dev)
	199	return NULL;
	200
9e3288dc	201	#if defined(CONFIG_PPC) \|\| defined(CONFIG_MICROBLAZE)
5fd200f3	202	dev->archdata.dma_mask = 0xffffffffUL;
9e3288dc	203	#endif
5fd200f3	204	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
eca39301	205	dev->dev.bus = &platform_bus_type;
5fd200f3 GL	206
	207	/* We do not fill the DMA ops for platform devices by default.
	208	* This is currently the responsibility of the platform code
	209	* to do such, possibly using a device notifier
	210	*/
	211
7096d042 GL	212	if (of_device_add(dev) != 0) {
7096d042 GL	213	platform_device_put(dev);
5fd200f3 GL	214	return NULL;
	215	}
	216
	217	return dev;
	218	}
	219	EXPORT_SYMBOL(of_platform_device_create);
	220
5de1540b GL	221	#ifdef CONFIG_ARM_AMBA
	222	static struct amba_device of_amba_device_create(struct device_node node,
	223	const char *bus_id,
	224	void *platform_data,
	225	struct device *parent)
	226	{
	227	struct amba_device *dev;
	228	const void *prop;
	229	int i, ret;
	230
	231	pr_debug("Creating amba device %s\n", node->full_name);
	232
	233	if (!of_device_is_available(node))
	234	return NULL;
	235
	236	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	237	if (!dev)
	238	return NULL;
	239
	240	/* setup generic device info */
	241	dev->dev.coherent_dma_mask = ~0;
	242	dev->dev.of_node = of_node_get(node);
	243	dev->dev.parent = parent;
	244	dev->dev.platform_data = platform_data;
	245	if (bus_id)
	246	dev_set_name(&dev->dev, "%s", bus_id);
	247	else
	248	of_device_make_bus_id(&dev->dev);
	249
	250	/* setup amba-specific device info */
	251	dev->dma_mask = ~0;
	252
	253	/* Allow the HW Peripheral ID to be overridden */
	254	prop = of_get_property(node, "arm,primecell-periphid", NULL);
	255	if (prop)
	256	dev->periphid = of_read_ulong(prop, 1);
	257
	258	/* Decode the IRQs and address ranges */
	259	for (i = 0; i < AMBA_NR_IRQS; i++)
	260	dev->irq[i] = irq_of_parse_and_map(node, i);
	261
	262	ret = of_address_to_resource(node, 0, &dev->res);
	263	if (ret)
	264	goto err_free;
	265
	266	ret = amba_device_register(dev, &iomem_resource);
	267	if (ret)
	268	goto err_free;
	269
	270	return dev;
	271
	272	err_free:
	273	kfree(dev);
	274	return NULL;
	275	}
	276	#else /* CONFIG_ARM_AMBA */
	277	static struct amba_device of_amba_device_create(struct device_node node,
	278	const char *bus_id,
	279	void *platform_data,
	280	struct device *parent)
	281	{
	282	return NULL;
	283	}
	284	#endif /* CONFIG_ARM_AMBA */
285
5fd200f3	286	/**
38e9e21d	287	* of_platform_bus_create() - Create a device for a node and its children.
5fd200f3	288	* @bus: device node of the bus to instantiate
1eed4c07	289	* @matches: match table for bus nodes
38e9e21d GL	290	* disallow recursive creation of child buses
	291	* @parent: parent for new device, or NULL for top level.
	292	*
	293	* Creates a platform_device for the provided device_node, and optionally
	294	* recursively create devices for all the child nodes.
5fd200f3	295	*/
38e9e21d	296	static int of_platform_bus_create(struct device_node *bus,
5fd200f3	297	const struct of_device_id *matches,
29d4f8a4	298	struct device *parent, bool strict)
5fd200f3 GL	299	{
5fd200f3 GL	300	struct device_node *child;
94a0cb1f	301	struct platform_device *dev;
5fd200f3 GL	302	int rc = 0;
5fd200f3 GL	303
29d4f8a4 GL	304	/* Make sure it has a compatible property */
	305	if (strict && (!of_get_property(bus, "compatible", NULL))) {
	306	pr_debug("%s() - skipping %s, no compatible prop\n",
	307	__func__, bus->full_name);
	308	return 0;
	309	}
	310
5de1540b GL	311	if (of_device_is_compatible(bus, "arm,primecell")) {
	312	of_amba_device_create(bus, NULL, NULL, parent);
	313	return 0;
	314	}
	315
38e9e21d GL	316	dev = of_platform_device_create(bus, NULL, parent);
	317	if (!dev \|\| !of_match_node(matches, bus))
	318	return 0;
	319
5fd200f3 GL	320	for_each_child_of_node(bus, child) {
5fd200f3 GL	321	pr_debug(" create child: %s\n", child->full_name);
29d4f8a4	322	rc = of_platform_bus_create(child, matches, &dev->dev, strict);
5fd200f3 GL	323	if (rc) {
	324	of_node_put(child);
	325	break;
	326	}
	327	}
	328	return rc;
	329	}
	330
	331	/**
38e9e21d	332	* of_platform_bus_probe() - Probe the device-tree for platform buses
5fd200f3	333	* @root: parent of the first level to probe or NULL for the root of the tree
1eed4c07	334	* @matches: match table for bus nodes
5fd200f3 GL	335	* @parent: parent to hook devices from, NULL for toplevel
	336	*
	337	* Note that children of the provided root are not instantiated as devices
	338	* unless the specified root itself matches the bus list and is not NULL.
	339	*/
	340	int of_platform_bus_probe(struct device_node *root,
	341	const struct of_device_id *matches,
	342	struct device *parent)
	343	{
	344	struct device_node *child;
5fd200f3 GL	345	int rc = 0;
5fd200f3 GL	346
1eed4c07 GL	347	root = root ? of_node_get(root) : of_find_node_by_path("/");
1eed4c07 GL	348	if (!root)
60d59913	349	return -EINVAL;
5fd200f3 GL	350
	351	pr_debug("of_platform_bus_probe()\n");
	352	pr_debug(" starting at: %s\n", root->full_name);
	353
1eed4c07	354	/* Do a self check of bus type, if there's a match, create children */
5fd200f3	355	if (of_match_node(matches, root)) {
29d4f8a4	356	rc = of_platform_bus_create(root, matches, parent, false);
38e9e21d	357	} else for_each_child_of_node(root, child) {
5fd200f3 GL	358	if (!of_match_node(matches, child))
5fd200f3 GL	359	continue;
29d4f8a4	360	rc = of_platform_bus_create(child, matches, parent, false);
38e9e21d	361	if (rc)
5fd200f3	362	break;
5fd200f3	363	}
38e9e21d	364
5fd200f3 GL	365	of_node_put(root);
	366	return rc;
	367	}
	368	EXPORT_SYMBOL(of_platform_bus_probe);
29d4f8a4 GL	369
	370	/**
	371	* of_platform_populate() - Populate platform_devices from device tree data
	372	* @root: parent of the first level to probe or NULL for the root of the tree
	373	* @matches: match table, NULL to use the default
	374	* @parent: parent to hook devices from, NULL for toplevel
	375	*
	376	* Similar to of_platform_bus_probe(), this function walks the device tree
	377	* and creates devices from nodes. It differs in that it follows the modern
	378	* convention of requiring all device nodes to have a 'compatible' property,
	379	* and it is suitable for creating devices which are children of the root
	380	* node (of_platform_bus_probe will only create children of the root which
	381	* are selected by the @matches argument).
	382	*
	383	* New board support should be using this function instead of
	384	* of_platform_bus_probe().
	385	*
	386	* Returns 0 on success, < 0 on failure.
	387	*/
	388	int of_platform_populate(struct device_node *root,
	389	const struct of_device_id *matches,
	390	struct device *parent)
	391	{
	392	struct device_node *child;
	393	int rc = 0;
	394
	395	root = root ? of_node_get(root) : of_find_node_by_path("/");
	396	if (!root)
	397	return -EINVAL;
	398
	399	for_each_child_of_node(root, child) {
	400	rc = of_platform_bus_create(child, matches, parent, true);
	401	if (rc)
	402	break;
	403	}
	404
	405	of_node_put(root);
	406	return rc;
	407	}
5fd200f3	408	#endif /* !CONFIG_SPARC */