[linux-2.6-block.git] / drivers / pinctrl / devicetree.c

/*
 * Device tree integration for the pin control subsystem
 *
 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#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 *pctldev,
				const char *statename,
				struct device_node *np_config)
{
	struct device_node *np_pctldev;
	const struct pinctrl_ops *ops;
	int ret;
	struct pinctrl_map *map;
	unsigned num_maps;

	/* Find the pin controller containing np_config */
	np_pctldev = of_node_get(np_config);
	for (;;) {
		np_pctldev = of_get_next_parent(np_pctldev);
		if (!np_pctldev || of_node_is_root(np_pctldev)) {
			dev_info(p->dev, "could not find pctldev for node %pOF, deferring probe\n",
				np_config);
			of_node_put(np_pctldev);
			/* OK let's just assume this will appear later then */
			return -EPROBE_DEFER;
		}
		/* If we're creating a hog we can use the passed pctldev */
		if (pctldev && (np_pctldev == p->dev->of_node))
			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
57291ce2 SW	1	/*
	2	* Device tree integration for the pin control subsystem
	3	*
	4	* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	17	*/
	18
	19	#include <linux/device.h>
	20	#include <linux/of.h>
	21	#include <linux/pinctrl/pinctrl.h>
	22	#include <linux/slab.h>
	23
	24	#include "core.h"
	25	#include "devicetree.h"
	26
	27	/**
	28	* struct pinctrl_dt_map - mapping table chunk parsed from device tree
	29	* @node: list node for struct pinctrl's @dt_maps field
	30	* @pctldev: the pin controller that allocated this struct, and will free it
	31	* @maps: the mapping table entries
	32	*/
	33	struct pinctrl_dt_map {
	34	struct list_head node;
	35	struct pinctrl_dev *pctldev;
	36	struct pinctrl_map *map;
	37	unsigned num_maps;
	38	};
	39
	40	static void dt_free_map(struct pinctrl_dev *pctldev,
	41	struct pinctrl_map *map, unsigned num_maps)
	42	{
	43	if (pctldev) {
022ab148	44	const struct pinctrl_ops *ops = pctldev->desc->pctlops;
92c2b671 TL	45	if (ops->dt_free_map)
92c2b671 TL	46	ops->dt_free_map(pctldev, map, num_maps);
57291ce2 SW	47	} else {
	48	/* There is no pctldev for PIN_MAP_TYPE_DUMMY_STATE */
	49	kfree(map);
	50	}
	51	}
	52
	53	void pinctrl_dt_free_maps(struct pinctrl *p)
	54	{
	55	struct pinctrl_dt_map dt_map, n1;
	56
	57	list_for_each_entry_safe(dt_map, n1, &p->dt_maps, node) {
	58	pinctrl_unregister_map(dt_map->map);
	59	list_del(&dt_map->node);
	60	dt_free_map(dt_map->pctldev, dt_map->map,
	61	dt_map->num_maps);
	62	kfree(dt_map);
	63	}
	64
	65	of_node_put(p->dev->of_node);
	66	}
	67
	68	static int dt_remember_or_free_map(struct pinctrl p, const char statename,
	69	struct pinctrl_dev *pctldev,
	70	struct pinctrl_map *map, unsigned num_maps)
	71	{
	72	int i;
	73	struct pinctrl_dt_map *dt_map;
	74
	75	/* Initialize common mapping table entry fields */
	76	for (i = 0; i < num_maps; i++) {
	77	map[i].dev_name = dev_name(p->dev);
	78	map[i].name = statename;
	79	if (pctldev)
	80	map[i].ctrl_dev_name = dev_name(pctldev->dev);
	81	}
	82
	83	/* Remember the converted mapping table entries */
	84	dt_map = kzalloc(sizeof(*dt_map), GFP_KERNEL);
	85	if (!dt_map) {
57291ce2 SW	86	dt_free_map(pctldev, map, num_maps);
	87	return -ENOMEM;
	88	}
	89
	90	dt_map->pctldev = pctldev;
	91	dt_map->map = map;
	92	dt_map->num_maps = num_maps;
	93	list_add_tail(&dt_map->node, &p->dt_maps);
	94
c5272a28	95	return pinctrl_register_map(map, num_maps, false);
57291ce2 SW	96	}
57291ce2 SW	97
1e63d7b9	98	struct pinctrl_dev of_pinctrl_get(struct device_node np)
f23f1516	99	{
fb00de77	100	return get_pinctrl_dev_from_of_node(np);
f23f1516 SH	101	}
f23f1516 SH	102
99e4f675 TL	103	static int dt_to_map_one_config(struct pinctrl *p,
	104	struct pinctrl_dev *pctldev,
	105	const char *statename,
57291ce2 SW	106	struct device_node *np_config)
	107	{
	108	struct device_node *np_pctldev;
022ab148	109	const struct pinctrl_ops *ops;
57291ce2 SW	110	int ret;
	111	struct pinctrl_map *map;
	112	unsigned num_maps;
	113
	114	/* Find the pin controller containing np_config */
	115	np_pctldev = of_node_get(np_config);
	116	for (;;) {
	117	np_pctldev = of_get_next_parent(np_pctldev);
	118	if (!np_pctldev \|\| of_node_is_root(np_pctldev)) {
f5292d06 RH	119	dev_info(p->dev, "could not find pctldev for node %pOF, deferring probe\n",
f5292d06 RH	120	np_config);
57291ce2	121	of_node_put(np_pctldev);
c05127c4 LW	122	/* OK let's just assume this will appear later then */
c05127c4 LW	123	return -EPROBE_DEFER;
57291ce2	124	}
b89405b6 RF	125	/* If we're creating a hog we can use the passed pctldev */
	126	if (pctldev && (np_pctldev == p->dev->of_node))
	127	break;
	128	pctldev = get_pinctrl_dev_from_of_node(np_pctldev);
57291ce2 SW	129	if (pctldev)
57291ce2 SW	130	break;
b2083062 LW	131	/* Do not defer probing of hogs (circular loop) */
	132	if (np_pctldev == p->dev->of_node) {
	133	of_node_put(np_pctldev);
	134	return -ENODEV;
	135	}
57291ce2 SW	136	}
	137	of_node_put(np_pctldev);
	138
	139	/*
	140	* Call pinctrl driver to parse device tree node, and
	141	* generate mapping table entries
	142	*/
	143	ops = pctldev->desc->pctlops;
	144	if (!ops->dt_node_to_map) {
	145	dev_err(p->dev, "pctldev %s doesn't support DT\n",
	146	dev_name(pctldev->dev));
	147	return -ENODEV;
	148	}
	149	ret = ops->dt_node_to_map(pctldev, np_config, &map, &num_maps);
	150	if (ret < 0)
	151	return ret;
	152
	153	/* Stash the mapping table chunk away for later use */
	154	return dt_remember_or_free_map(p, statename, pctldev, map, num_maps);
	155	}
	156
	157	static int dt_remember_dummy_state(struct pinctrl p, const char statename)
	158	{
	159	struct pinctrl_map *map;
	160
	161	map = kzalloc(sizeof(*map), GFP_KERNEL);
9b21e72e	162	if (!map)
57291ce2	163	return -ENOMEM;
57291ce2 SW	164
	165	/* There is no pctldev for PIN_MAP_TYPE_DUMMY_STATE */
	166	map->type = PIN_MAP_TYPE_DUMMY_STATE;
	167
	168	return dt_remember_or_free_map(p, statename, NULL, map, 1);
	169	}
	170
99e4f675 TL	171	bool pinctrl_dt_has_hogs(struct pinctrl_dev *pctldev)
	172	{
	173	struct device_node *np;
	174	struct property *prop;
	175	int size;
	176
	177	np = pctldev->dev->of_node;
	178	if (!np)
	179	return false;
	180
	181	prop = of_find_property(np, "pinctrl-0", &size);
	182
	183	return prop ? true : false;
	184	}
	185
	186	int pinctrl_dt_to_map(struct pinctrl p, struct pinctrl_dev pctldev)
57291ce2 SW	187	{
	188	struct device_node *np = p->dev->of_node;
	189	int state, ret;
	190	char *propname;
	191	struct property *prop;
	192	const char *statename;
	193	const __be32 *list;
	194	int size, config;
	195	phandle phandle;
	196	struct device_node *np_config;
	197
	198	/* CONFIG_OF enabled, p->dev not instantiated from DT */
	199	if (!np) {
5d88dcea MB	200	if (of_have_populated_dt())
	201	dev_dbg(p->dev,
	202	"no of_node; not parsing pinctrl DT\n");
57291ce2 SW	203	return 0;
	204	}
	205
	206	/* We may store pointers to property names within the node */
	207	of_node_get(np);
	208
	209	/* For each defined state ID */
	210	for (state = 0; ; state++) {
	211	/* Retrieve the pinctrl-* property */
	212	propname = kasprintf(GFP_KERNEL, "pinctrl-%d", state);
	213	prop = of_find_property(np, propname, &size);
	214	kfree(propname);
98849fa0 JH	215	if (!prop) {
	216	if (state == 0) {
	217	of_node_put(np);
	218	return -ENODEV;
	219	}
57291ce2	220	break;
98849fa0	221	}
57291ce2 SW	222	list = prop->value;
	223	size /= sizeof(*list);
	224
	225	/* Determine whether pinctrl-names property names the state */
	226	ret = of_property_read_string_index(np, "pinctrl-names",
	227	state, &statename);
	228	/*
	229	* If not, statename is just the integer state ID. But rather
	230	* than dynamically allocate it and have to free it later,
	231	* just point part way into the property name for the string.
	232	*/
	233	if (ret < 0) {
	234	/* strlen("pinctrl-") == 8 */
	235	statename = prop->name + 8;
	236	}
	237
	238	/* For every referenced pin configuration node in it */
	239	for (config = 0; config < size; config++) {
	240	phandle = be32_to_cpup(list++);
	241
	242	/* Look up the pin configuration node */
	243	np_config = of_find_node_by_phandle(phandle);
	244	if (!np_config) {
	245	dev_err(p->dev,
	246	"prop %s index %i invalid phandle\n",
	247	prop->name, config);
	248	ret = -EINVAL;
	249	goto err;
	250	}
	251
	252	/* Parse the node */
99e4f675 TL	253	ret = dt_to_map_one_config(p, pctldev, statename,
99e4f675 TL	254	np_config);
57291ce2 SW	255	of_node_put(np_config);
	256	if (ret < 0)
	257	goto err;
	258	}
	259
	260	/* No entries in DT? Generate a dummy state table entry */
	261	if (!size) {
	262	ret = dt_remember_dummy_state(p, statename);
	263	if (ret < 0)
	264	goto err;
	265	}
	266	}
	267
	268	return 0;
	269
	270	err:
	271	pinctrl_dt_free_maps(p);
	272	return ret;
	273	}
42124bc5 TL	274
	275	/*
	276	* For pinctrl binding, typically #pinctrl-cells is for the pin controller
	277	* device, so either parent or grandparent. See pinctrl-bindings.txt.
	278	*/
	279	static int pinctrl_find_cells_size(const struct device_node *np)
	280	{
	281	const char *cells_name = "#pinctrl-cells";
	282	int cells_size, error;
	283
	284	error = of_property_read_u32(np->parent, cells_name, &cells_size);
	285	if (error) {
	286	error = of_property_read_u32(np->parent->parent,
	287	cells_name, &cells_size);
	288	if (error)
	289	return -ENOENT;
	290	}
	291
	292	return cells_size;
	293	}
	294
	295	/**
	296	* pinctrl_get_list_and_count - Gets the list and it's cell size and number
	297	* @np: pointer to device node with the property
	298	* @list_name: property that contains the list
	299	* @list: pointer for the list found
	300	* @cells_size: pointer for the cell size found
	301	* @nr_elements: pointer for the number of elements found
	302	*
	303	* Typically np is a single pinctrl entry containing the list.
	304	*/
	305	static int pinctrl_get_list_and_count(const struct device_node *np,
	306	const char *list_name,
	307	const __be32 **list,
	308	int *cells_size,
	309	int *nr_elements)
	310	{
	311	int size;
	312
	313	*cells_size = 0;
	314	*nr_elements = 0;
	315
	316	*list = of_get_property(np, list_name, &size);
	317	if (!*list)
	318	return -ENOENT;
	319
	320	*cells_size = pinctrl_find_cells_size(np);
	321	if (*cells_size < 0)
	322	return -ENOENT;
	323
	324	/* First element is always the index within the pinctrl device */
	325	nr_elements = (size / sizeof(list)) / (cells_size + 1);
	326
	327	return 0;
	328	}
	329
	330	/**
	331	* pinctrl_count_index_with_args - Count number of elements in a pinctrl entry
	332	* @np: pointer to device node with the property
	333	* @list_name: property that contains the list
	334	*
	335	* Counts the number of elements in a pinctrl array consisting of an index
	336	* within the controller and a number of u32 entries specified for each
	337	* entry. Note that device_node is always for the parent pin controller device.
338	*/
339	int pinctrl_count_index_with_args(const struct device_node *np,
340	const char *list_name)
341	{
342	const __be32 *list;
343	int size, nr_cells, error;
344
345	error = pinctrl_get_list_and_count(np, list_name, &list,
346	&nr_cells, &size);
347	if (error)
348	return error;
349
350	return size;
351	}
352	EXPORT_SYMBOL_GPL(pinctrl_count_index_with_args);
353
354	/**
355	* pinctrl_copy_args - Populates of_phandle_args based on index
356	* @np: pointer to device node with the property
357	* @list: pointer to a list with the elements
358	* @index: entry within the list of elements
359	* @nr_cells: number of cells in the list
360	* @nr_elem: number of elements for each entry in the list
361	* @out_args: returned values
362	*
363	* Populates the of_phandle_args based on the index in the list.
364	*/
365	static int pinctrl_copy_args(const struct device_node *np,
366	const __be32 *list,
367	int index, int nr_cells, int nr_elem,
368	struct of_phandle_args *out_args)
369	{
370	int i;
371
372	memset(out_args, 0, sizeof(*out_args));
373	out_args->np = (struct device_node *)np;
374	out_args->args_count = nr_cells + 1;
375
376	if (index >= nr_elem)
377	return -EINVAL;
378
379	list += index * (nr_cells + 1);
380
381	for (i = 0; i < nr_cells + 1; i++)
382	out_args->args[i] = be32_to_cpup(list++);
383
384	return 0;
385	}
386
387	/**
388	* pinctrl_parse_index_with_args - Find a node pointed by index in a list
389	* @np: pointer to device node with the property
390	* @list_name: property that contains the list
391	* @index: index within the list
392	* @out_arts: entries in the list pointed by index
393	*
394	* Finds the selected element in a pinctrl array consisting of an index
395	* within the controller and a number of u32 entries specified for each
396	* entry. Note that device_node is always for the parent pin controller device.
397	*/
398	int pinctrl_parse_index_with_args(const struct device_node *np,
399	const char *list_name, int index,
400	struct of_phandle_args *out_args)
401	{
402	const __be32 *list;
403	int nr_elem, nr_cells, error;
404
405	error = pinctrl_get_list_and_count(np, list_name, &list,
406	&nr_cells, &nr_elem);
407	if (error \|\| !nr_cells)
408	return error;
409
410	error = pinctrl_copy_args(np, list, index, nr_cells, nr_elem,
411	out_args);
412	if (error)
413	return error;
414
415	return 0;
416	}
417	EXPORT_SYMBOL_GPL(pinctrl_parse_index_with_args);