[linux-block.git] / drivers / pinctrl / devicetree.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Device tree integration for the pin control subsystem
 *
 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
 */

#include <linux/device.h>
#include <linux/of.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/slab.h>

#include "core.h"
#include "devicetree.h"

/**
 * struct pinctrl_dt_map - mapping table chunk parsed from device tree
 * @node: list node for struct pinctrl's @dt_maps field
 * @pctldev: the pin controller that allocated this struct, and will free it
 * @maps: the mapping table entries
 */
struct pinctrl_dt_map {
	struct list_head node;
	struct pinctrl_dev *pctldev;
	struct pinctrl_map *map;
	unsigned num_maps;
};

static void dt_free_map(struct pinctrl_dev *pctldev,
		     struct pinctrl_map *map, unsigned num_maps)
{
	if (pctldev) {
		const struct pinctrl_ops *ops = pctldev->desc->pctlops;
		if (ops->dt_free_map)
			ops->dt_free_map(pctldev, map, num_maps);
	} else {
		/* There is no pctldev for PIN_MAP_TYPE_DUMMY_STATE */
		kfree(map);
	}
}

void pinctrl_dt_free_maps(struct pinctrl *p)
{
	struct pinctrl_dt_map *dt_map, *n1;

	list_for_each_entry_safe(dt_map, n1, &p->dt_maps, node) {
		pinctrl_unregister_map(dt_map->map);
		list_del(&dt_map->node);
		dt_free_map(dt_map->pctldev, dt_map->map,
			    dt_map->num_maps);
		kfree(dt_map);
	}

	of_node_put(p->dev->of_node);
}

static int dt_remember_or_free_map(struct pinctrl *p, const char *statename,
				   struct pinctrl_dev *pctldev,
				   struct pinctrl_map *map, unsigned num_maps)
{
	int i;
	struct pinctrl_dt_map *dt_map;

	/* Initialize common mapping table entry fields */
	for (i = 0; i < num_maps; i++) {
		map[i].dev_name = dev_name(p->dev);
		map[i].name = statename;
		if (pctldev)
			map[i].ctrl_dev_name = dev_name(pctldev->dev);
	}

	/* Remember the converted mapping table entries */
	dt_map = kzalloc(sizeof(*dt_map), GFP_KERNEL);
	if (!dt_map) {
		dt_free_map(pctldev, map, num_maps);
		return -ENOMEM;
	}

	dt_map->pctldev = pctldev;
	dt_map->map = map;
	dt_map->num_maps = num_maps;
	list_add_tail(&dt_map->node, &p->dt_maps);

	return pinctrl_register_map(map, num_maps, false);
}

struct pinctrl_dev *of_pinctrl_get(struct device_node *np)
{
	return get_pinctrl_dev_from_of_node(np);
}

static int dt_to_map_one_config(struct pinctrl *p,
				struct pinctrl_dev *hog_pctldev,
				const char *statename,
				struct device_node *np_config)
{
	struct pinctrl_dev *pctldev = NULL;
	struct device_node *np_pctldev;
	const struct pinctrl_ops *ops;
	int ret;
	struct pinctrl_map *map;
	unsigned num_maps;
	bool allow_default = false;

	/* Find the pin controller containing np_config */
	np_pctldev = of_node_get(np_config);
	for (;;) {
		if (!allow_default)
			allow_default = of_property_read_bool(np_pctldev,
							      "pinctrl-use-default");

		np_pctldev = of_get_next_parent(np_pctldev);
		if (!np_pctldev || of_node_is_root(np_pctldev)) {
			of_node_put(np_pctldev);
			ret = driver_deferred_probe_check_state(p->dev);
			/* keep deferring if modules are enabled unless we've timed out */
			if (IS_ENABLED(CONFIG_MODULES) && !allow_default && ret == -ENODEV)
				ret = -EPROBE_DEFER;

			return ret;
		}
		/* If we're creating a hog we can use the passed pctldev */
		if (hog_pctldev && (np_pctldev == p->dev->of_node)) {
			pctldev = hog_pctldev;
			break;
		}
		pctldev = get_pinctrl_dev_from_of_node(np_pctldev);
		if (pctldev)
			break;
		/* Do not defer probing of hogs (circular loop) */
		if (np_pctldev == p->dev->of_node) {
			of_node_put(np_pctldev);
			return -ENODEV;
		}
	}
	of_node_put(np_pctldev);

	/*
	 * Call pinctrl driver to parse device tree node, and
	 * generate mapping table entries
	 */
	ops = pctldev->desc->pctlops;
	if (!ops->dt_node_to_map) {
		dev_err(p->dev, "pctldev %s doesn't support DT\n",
			dev_name(pctldev->dev));
		return -ENODEV;
	}
	ret = ops->dt_node_to_map(pctldev, np_config, &map, &num_maps);
	if (ret < 0)
		return ret;

	/* Stash the mapping table chunk away for later use */
	return dt_remember_or_free_map(p, statename, pctldev, map, num_maps);
}

static int dt_remember_dummy_state(struct pinctrl *p, const char *statename)
{
	struct pinctrl_map *map;

	map = kzalloc(sizeof(*map), GFP_KERNEL);
	if (!map)
		return -ENOMEM;

	/* There is no pctldev for PIN_MAP_TYPE_DUMMY_STATE */
	map->type = PIN_MAP_TYPE_DUMMY_STATE;

	return dt_remember_or_free_map(p, statename, NULL, map, 1);
}

bool pinctrl_dt_has_hogs(struct pinctrl_dev *pctldev)
{
	struct device_node *np;
	struct property *prop;
	int size;

	np = pctldev->dev->of_node;
	if (!np)
		return false;

	prop = of_find_property(np, "pinctrl-0", &size);

	return prop ? true : false;
}

int pinctrl_dt_to_map(struct pinctrl *p, struct pinctrl_dev *pctldev)
{
	struct device_node *np = p->dev->of_node;
	int state, ret;
	char *propname;
	struct property *prop;
	const char *statename;
	const __be32 *list;
	int size, config;
	phandle phandle;
	struct device_node *np_config;

	/* CONFIG_OF enabled, p->dev not instantiated from DT */
	if (!np) {
		if (of_have_populated_dt())
			dev_dbg(p->dev,
				"no of_node; not parsing pinctrl DT\n");
		return 0;
	}

	/* We may store pointers to property names within the node */
	of_node_get(np);

	/* For each defined state ID */
	for (state = 0; ; state++) {
		/* Retrieve the pinctrl-* property */
		propname = kasprintf(GFP_KERNEL, "pinctrl-%d", state);
		prop = of_find_property(np, propname, &size);
		kfree(propname);
		if (!prop) {
			if (state == 0) {
				of_node_put(np);
				return -ENODEV;
			}
			break;
		}
		list = prop->value;
		size /= sizeof(*list);

		/* Determine whether pinctrl-names property names the state */
		ret = of_property_read_string_index(np, "pinctrl-names",
						    state, &statename);
		/*
		 * If not, statename is just the integer state ID. But rather
		 * than dynamically allocate it and have to free it later,
		 * just point part way into the property name for the string.
		 */
		if (ret < 0) {
			/* strlen("pinctrl-") == 8 */
			statename = prop->name + 8;
		}

		/* For every referenced pin configuration node in it */
		for (config = 0; config < size; config++) {
			phandle = be32_to_cpup(list++);

			/* Look up the pin configuration node */
			np_config = of_find_node_by_phandle(phandle);
			if (!np_config) {
				dev_err(p->dev,
					"prop %s index %i invalid phandle\n",
					prop->name, config);
				ret = -EINVAL;
				goto err;
			}

			/* Parse the node */
			ret = dt_to_map_one_config(p, pctldev, statename,
						   np_config);
			of_node_put(np_config);
			if (ret < 0)
				goto err;
		}

		/* No entries in DT? Generate a dummy state table entry */
		if (!size) {
			ret = dt_remember_dummy_state(p, statename);
			if (ret < 0)
				goto err;
		}
	}

	return 0;

err:
	pinctrl_dt_free_maps(p);
	return ret;
}

/*
 * For pinctrl binding, typically #pinctrl-cells is for the pin controller
 * device, so either parent or grandparent. See pinctrl-bindings.txt.
 */
static int pinctrl_find_cells_size(const struct device_node *np)
{
	const char *cells_name = "#pinctrl-cells";
	int cells_size, error;

	error = of_property_read_u32(np->parent, cells_name, &cells_size);
	if (error) {
		error = of_property_read_u32(np->parent->parent,
					     cells_name, &cells_size);
		if (error)
			return -ENOENT;
	}

	return cells_size;
}

/**
 * pinctrl_get_list_and_count - Gets the list and it's cell size and number
 * @np: pointer to device node with the property
 * @list_name: property that contains the list
 * @list: pointer for the list found
 * @cells_size: pointer for the cell size found
 * @nr_elements: pointer for the number of elements found
 *
 * Typically np is a single pinctrl entry containing the list.
 */
static int pinctrl_get_list_and_count(const struct device_node *np,
				      const char *list_name,
				      const __be32 **list,
				      int *cells_size,
				      int *nr_elements)
{
	int size;

	*cells_size = 0;
	*nr_elements = 0;

	*list = of_get_property(np, list_name, &size);
	if (!*list)
		return -ENOENT;

	*cells_size = pinctrl_find_cells_size(np);
	if (*cells_size < 0)
		return -ENOENT;

	/* First element is always the index within the pinctrl device */
	*nr_elements = (size / sizeof(**list)) / (*cells_size + 1);

	return 0;
}

/**
 * pinctrl_count_index_with_args - Count number of elements in a pinctrl entry
 * @np: pointer to device node with the property
 * @list_name: property that contains the list
 *
 * Counts the number of elements in a pinctrl array consisting of an index
 * within the controller and a number of u32 entries specified for each
 * entry. Note that device_node is always for the parent pin controller device.
 */
int pinctrl_count_index_with_args(const struct device_node *np,
				  const char *list_name)
{
	const __be32 *list;
	int size, nr_cells, error;

	error = pinctrl_get_list_and_count(np, list_name, &list,
					   &nr_cells, &size);
	if (error)
		return error;

	return size;
}
EXPORT_SYMBOL_GPL(pinctrl_count_index_with_args);

/**
 * pinctrl_copy_args - Populates of_phandle_args based on index
 * @np: pointer to device node with the property
 * @list: pointer to a list with the elements
 * @index: entry within the list of elements
 * @nr_cells: number of cells in the list
 * @nr_elem: number of elements for each entry in the list
 * @out_args: returned values
 *
 * Populates the of_phandle_args based on the index in the list.
 */
static int pinctrl_copy_args(const struct device_node *np,
			     const __be32 *list,
			     int index, int nr_cells, int nr_elem,
			     struct of_phandle_args *out_args)
{
	int i;

	memset(out_args, 0, sizeof(*out_args));
	out_args->np = (struct device_node *)np;
	out_args->args_count = nr_cells + 1;

	if (index >= nr_elem)
		return -EINVAL;

	list += index * (nr_cells + 1);

	for (i = 0; i < nr_cells + 1; i++)
		out_args->args[i] = be32_to_cpup(list++);

	return 0;
}

/**
 * pinctrl_parse_index_with_args - Find a node pointed by index in a list
 * @np: pointer to device node with the property
 * @list_name: property that contains the list
 * @index: index within the list
 * @out_arts: entries in the list pointed by index
 *
 * Finds the selected element in a pinctrl array consisting of an index
 * within the controller and a number of u32 entries specified for each
 * entry. Note that device_node is always for the parent pin controller device.
 */
int pinctrl_parse_index_with_args(const struct device_node *np,
				  const char *list_name, int index,
				  struct of_phandle_args *out_args)
{
	const __be32 *list;
	int nr_elem, nr_cells, error;

	error = pinctrl_get_list_and_count(np, list_name, &list,
					   &nr_cells, &nr_elem);
	if (error || !nr_cells)
		return error;

	error = pinctrl_copy_args(np, list, index, nr_cells, nr_elem,
				  out_args);
	if (error)
		return error;

	return 0;
}
EXPORT_SYMBOL_GPL(pinctrl_parse_index_with_args);
Commit	Line	Data
9952f691	1	// SPDX-License-Identifier: GPL-2.0-only
57291ce2 SW	2	/*
	3	* Device tree integration for the pin control subsystem
	4	*
	5	* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
57291ce2 SW	6	*/
	7
	8	#include <linux/device.h>
	9	#include <linux/of.h>
	10	#include <linux/pinctrl/pinctrl.h>
	11	#include <linux/slab.h>
	12
	13	#include "core.h"
	14	#include "devicetree.h"
	15
	16	/**
	17	* struct pinctrl_dt_map - mapping table chunk parsed from device tree
	18	* @node: list node for struct pinctrl's @dt_maps field
	19	* @pctldev: the pin controller that allocated this struct, and will free it
	20	* @maps: the mapping table entries
	21	*/
	22	struct pinctrl_dt_map {
	23	struct list_head node;
	24	struct pinctrl_dev *pctldev;
	25	struct pinctrl_map *map;
	26	unsigned num_maps;
	27	};
	28
	29	static void dt_free_map(struct pinctrl_dev *pctldev,
	30	struct pinctrl_map *map, unsigned num_maps)
	31	{
	32	if (pctldev) {
022ab148	33	const struct pinctrl_ops *ops = pctldev->desc->pctlops;
92c2b671 TL	34	if (ops->dt_free_map)
92c2b671 TL	35	ops->dt_free_map(pctldev, map, num_maps);
57291ce2 SW	36	} else {
	37	/* There is no pctldev for PIN_MAP_TYPE_DUMMY_STATE */
	38	kfree(map);
	39	}
	40	}
	41
	42	void pinctrl_dt_free_maps(struct pinctrl *p)
	43	{
	44	struct pinctrl_dt_map dt_map, n1;
	45
	46	list_for_each_entry_safe(dt_map, n1, &p->dt_maps, node) {
	47	pinctrl_unregister_map(dt_map->map);
	48	list_del(&dt_map->node);
	49	dt_free_map(dt_map->pctldev, dt_map->map,
	50	dt_map->num_maps);
	51	kfree(dt_map);
	52	}
	53
	54	of_node_put(p->dev->of_node);
	55	}
	56
	57	static int dt_remember_or_free_map(struct pinctrl p, const char statename,
	58	struct pinctrl_dev *pctldev,
	59	struct pinctrl_map *map, unsigned num_maps)
	60	{
	61	int i;
	62	struct pinctrl_dt_map *dt_map;
	63
	64	/* Initialize common mapping table entry fields */
	65	for (i = 0; i < num_maps; i++) {
	66	map[i].dev_name = dev_name(p->dev);
	67	map[i].name = statename;
	68	if (pctldev)
	69	map[i].ctrl_dev_name = dev_name(pctldev->dev);
	70	}
	71
	72	/* Remember the converted mapping table entries */
	73	dt_map = kzalloc(sizeof(*dt_map), GFP_KERNEL);
	74	if (!dt_map) {
57291ce2 SW	75	dt_free_map(pctldev, map, num_maps);
	76	return -ENOMEM;
	77	}
	78
	79	dt_map->pctldev = pctldev;
	80	dt_map->map = map;
	81	dt_map->num_maps = num_maps;
	82	list_add_tail(&dt_map->node, &p->dt_maps);
	83
c5272a28	84	return pinctrl_register_map(map, num_maps, false);
57291ce2 SW	85	}
57291ce2 SW	86
1e63d7b9	87	struct pinctrl_dev of_pinctrl_get(struct device_node np)
f23f1516	88	{
fb00de77	89	return get_pinctrl_dev_from_of_node(np);
f23f1516 SH	90	}
f23f1516 SH	91
99e4f675	92	static int dt_to_map_one_config(struct pinctrl *p,
bc3322bc	93	struct pinctrl_dev *hog_pctldev,
99e4f675	94	const char *statename,
57291ce2 SW	95	struct device_node *np_config)
57291ce2 SW	96	{
bc3322bc	97	struct pinctrl_dev *pctldev = NULL;
57291ce2	98	struct device_node *np_pctldev;
022ab148	99	const struct pinctrl_ops *ops;
57291ce2 SW	100	int ret;
	101	struct pinctrl_map *map;
	102	unsigned num_maps;
d19c5e79	103	bool allow_default = false;
57291ce2 SW	104
	105	/* Find the pin controller containing np_config */
	106	np_pctldev = of_node_get(np_config);
	107	for (;;) {
d19c5e79 RH	108	if (!allow_default)
	109	allow_default = of_property_read_bool(np_pctldev,
	110	"pinctrl-use-default");
	111
57291ce2 SW	112	np_pctldev = of_get_next_parent(np_pctldev);
57291ce2 SW	113	if (!np_pctldev \|\| of_node_is_root(np_pctldev)) {
57291ce2	114	of_node_put(np_pctldev);
d19c5e79 RH	115	ret = driver_deferred_probe_check_state(p->dev);
	116	/* keep deferring if modules are enabled unless we've timed out */
	117	if (IS_ENABLED(CONFIG_MODULES) && !allow_default && ret == -ENODEV)
	118	ret = -EPROBE_DEFER;
	119
	120	return ret;
57291ce2	121	}
b89405b6	122	/* If we're creating a hog we can use the passed pctldev */
bc3322bc FE	123	if (hog_pctldev && (np_pctldev == p->dev->of_node)) {
bc3322bc FE	124	pctldev = hog_pctldev;
b89405b6	125	break;
bc3322bc	126	}
b89405b6	127	pctldev = get_pinctrl_dev_from_of_node(np_pctldev);
57291ce2 SW	128	if (pctldev)
57291ce2 SW	129	break;
b2083062 LW	130	/* Do not defer probing of hogs (circular loop) */
	131	if (np_pctldev == p->dev->of_node) {
	132	of_node_put(np_pctldev);
	133	return -ENODEV;
	134	}
57291ce2 SW	135	}
	136	of_node_put(np_pctldev);
	137
	138	/*
	139	* Call pinctrl driver to parse device tree node, and
	140	* generate mapping table entries
	141	*/
	142	ops = pctldev->desc->pctlops;
	143	if (!ops->dt_node_to_map) {
	144	dev_err(p->dev, "pctldev %s doesn't support DT\n",
	145	dev_name(pctldev->dev));
	146	return -ENODEV;
	147	}
	148	ret = ops->dt_node_to_map(pctldev, np_config, &map, &num_maps);
	149	if (ret < 0)
	150	return ret;
	151
	152	/* Stash the mapping table chunk away for later use */
	153	return dt_remember_or_free_map(p, statename, pctldev, map, num_maps);
	154	}
	155
	156	static int dt_remember_dummy_state(struct pinctrl p, const char statename)
	157	{
	158	struct pinctrl_map *map;
	159
	160	map = kzalloc(sizeof(*map), GFP_KERNEL);
9b21e72e	161	if (!map)
57291ce2	162	return -ENOMEM;
57291ce2 SW	163
	164	/* There is no pctldev for PIN_MAP_TYPE_DUMMY_STATE */
	165	map->type = PIN_MAP_TYPE_DUMMY_STATE;
	166
	167	return dt_remember_or_free_map(p, statename, NULL, map, 1);
	168	}
	169
99e4f675 TL	170	bool pinctrl_dt_has_hogs(struct pinctrl_dev *pctldev)
	171	{
	172	struct device_node *np;
	173	struct property *prop;
	174	int size;
	175
	176	np = pctldev->dev->of_node;
	177	if (!np)
	178	return false;
	179
	180	prop = of_find_property(np, "pinctrl-0", &size);
	181
	182	return prop ? true : false;
	183	}
	184
	185	int pinctrl_dt_to_map(struct pinctrl p, struct pinctrl_dev pctldev)
57291ce2 SW	186	{
	187	struct device_node *np = p->dev->of_node;
	188	int state, ret;
	189	char *propname;
	190	struct property *prop;
	191	const char *statename;
	192	const __be32 *list;
	193	int size, config;
	194	phandle phandle;
	195	struct device_node *np_config;
	196
	197	/* CONFIG_OF enabled, p->dev not instantiated from DT */
	198	if (!np) {
5d88dcea MB	199	if (of_have_populated_dt())
	200	dev_dbg(p->dev,
	201	"no of_node; not parsing pinctrl DT\n");
57291ce2 SW	202	return 0;
	203	}
	204
	205	/* We may store pointers to property names within the node */
	206	of_node_get(np);
	207
	208	/* For each defined state ID */
	209	for (state = 0; ; state++) {
	210	/* Retrieve the pinctrl-* property */
	211	propname = kasprintf(GFP_KERNEL, "pinctrl-%d", state);
	212	prop = of_find_property(np, propname, &size);
	213	kfree(propname);
98849fa0 JH	214	if (!prop) {
	215	if (state == 0) {
	216	of_node_put(np);
	217	return -ENODEV;
	218	}
57291ce2	219	break;
98849fa0	220	}
57291ce2 SW	221	list = prop->value;
	222	size /= sizeof(*list);
	223
	224	/* Determine whether pinctrl-names property names the state */
	225	ret = of_property_read_string_index(np, "pinctrl-names",
	226	state, &statename);
	227	/*
	228	* If not, statename is just the integer state ID. But rather
	229	* than dynamically allocate it and have to free it later,
	230	* just point part way into the property name for the string.
	231	*/
	232	if (ret < 0) {
	233	/* strlen("pinctrl-") == 8 */
	234	statename = prop->name + 8;
	235	}
	236
	237	/* For every referenced pin configuration node in it */
	238	for (config = 0; config < size; config++) {
	239	phandle = be32_to_cpup(list++);
	240
	241	/* Look up the pin configuration node */
	242	np_config = of_find_node_by_phandle(phandle);
	243	if (!np_config) {
	244	dev_err(p->dev,
	245	"prop %s index %i invalid phandle\n",
	246	prop->name, config);
	247	ret = -EINVAL;
	248	goto err;
	249	}
	250
	251	/* Parse the node */
99e4f675 TL	252	ret = dt_to_map_one_config(p, pctldev, statename,
99e4f675 TL	253	np_config);
57291ce2 SW	254	of_node_put(np_config);
	255	if (ret < 0)
	256	goto err;
	257	}
	258
	259	/* No entries in DT? Generate a dummy state table entry */
	260	if (!size) {
	261	ret = dt_remember_dummy_state(p, statename);
	262	if (ret < 0)
	263	goto err;
	264	}
	265	}
	266
	267	return 0;
	268
	269	err:
	270	pinctrl_dt_free_maps(p);
	271	return ret;
	272	}
42124bc5 TL	273
	274	/*
	275	* For pinctrl binding, typically #pinctrl-cells is for the pin controller
	276	* device, so either parent or grandparent. See pinctrl-bindings.txt.
	277	*/
	278	static int pinctrl_find_cells_size(const struct device_node *np)
	279	{
	280	const char *cells_name = "#pinctrl-cells";
	281	int cells_size, error;
	282
	283	error = of_property_read_u32(np->parent, cells_name, &cells_size);
	284	if (error) {
	285	error = of_property_read_u32(np->parent->parent,
	286	cells_name, &cells_size);
	287	if (error)
	288	return -ENOENT;
	289	}
	290
	291	return cells_size;
	292	}
	293
	294	/**
	295	* pinctrl_get_list_and_count - Gets the list and it's cell size and number
	296	* @np: pointer to device node with the property
	297	* @list_name: property that contains the list
	298	* @list: pointer for the list found
	299	* @cells_size: pointer for the cell size found
	300	* @nr_elements: pointer for the number of elements found
	301	*
	302	* Typically np is a single pinctrl entry containing the list.
	303	*/
	304	static int pinctrl_get_list_and_count(const struct device_node *np,
	305	const char *list_name,
	306	const __be32 **list,
	307	int *cells_size,
	308	int *nr_elements)
	309	{
	310	int size;
	311
	312	*cells_size = 0;
	313	*nr_elements = 0;
	314
	315	*list = of_get_property(np, list_name, &size);
	316	if (!*list)
	317	return -ENOENT;
	318
	319	*cells_size = pinctrl_find_cells_size(np);
	320	if (*cells_size < 0)
	321	return -ENOENT;
	322
	323	/* First element is always the index within the pinctrl device */
	324	nr_elements = (size / sizeof(list)) / (cells_size + 1);
	325
	326	return 0;
	327	}
	328
	329	/**
	330	* pinctrl_count_index_with_args - Count number of elements in a pinctrl entry
	331	* @np: pointer to device node with the property
	332	* @list_name: property that contains the list
	333	*
	334	* Counts the number of elements in a pinctrl array consisting of an index
	335	* within the controller and a number of u32 entries specified for each
	336	* entry. Note that device_node is always for the parent pin controller device.
337	*/
338	int pinctrl_count_index_with_args(const struct device_node *np,
339	const char *list_name)
340	{
341	const __be32 *list;
342	int size, nr_cells, error;
343
344	error = pinctrl_get_list_and_count(np, list_name, &list,
345	&nr_cells, &size);
346	if (error)
347	return error;
348
349	return size;
350	}
351	EXPORT_SYMBOL_GPL(pinctrl_count_index_with_args);
352
353	/**
354	* pinctrl_copy_args - Populates of_phandle_args based on index
355	* @np: pointer to device node with the property
356	* @list: pointer to a list with the elements
357	* @index: entry within the list of elements
358	* @nr_cells: number of cells in the list
359	* @nr_elem: number of elements for each entry in the list
360	* @out_args: returned values
361	*
362	* Populates the of_phandle_args based on the index in the list.
363	*/
364	static int pinctrl_copy_args(const struct device_node *np,
365	const __be32 *list,
366	int index, int nr_cells, int nr_elem,
367	struct of_phandle_args *out_args)
368	{
369	int i;
370
371	memset(out_args, 0, sizeof(*out_args));
372	out_args->np = (struct device_node *)np;
373	out_args->args_count = nr_cells + 1;
374
375	if (index >= nr_elem)
376	return -EINVAL;
377
378	list += index * (nr_cells + 1);
379
380	for (i = 0; i < nr_cells + 1; i++)
381	out_args->args[i] = be32_to_cpup(list++);
382
383	return 0;
384	}
385
386	/**
387	* pinctrl_parse_index_with_args - Find a node pointed by index in a list
388	* @np: pointer to device node with the property
389	* @list_name: property that contains the list
390	* @index: index within the list
391	* @out_arts: entries in the list pointed by index
392	*
393	* Finds the selected element in a pinctrl array consisting of an index
394	* within the controller and a number of u32 entries specified for each
395	* entry. Note that device_node is always for the parent pin controller device.
396	*/
397	int pinctrl_parse_index_with_args(const struct device_node *np,
398	const char *list_name, int index,
399	struct of_phandle_args *out_args)
400	{
401	const __be32 *list;
402	int nr_elem, nr_cells, error;
403
404	error = pinctrl_get_list_and_count(np, list_name, &list,
405	&nr_cells, &nr_elem);
406	if (error \|\| !nr_cells)
407	return error;
408
409	error = pinctrl_copy_args(np, list, index, nr_cells, nr_elem,
410	out_args);
411	if (error)
412	return error;
413
414	return 0;
415	}
416	EXPORT_SYMBOL_GPL(pinctrl_parse_index_with_args);