[mirror_ubuntu-zesty-kernel.git] / drivers / pinctrl / pinconf-generic.c

/*
 * Core driver for the generic pin config portions of the pin control subsystem
 *
 * Copyright (C) 2011 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 *
 * License terms: GNU General Public License (GPL) version 2
 */

#define pr_fmt(fmt) "generic pinconfig core: " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/of.h>
#include "core.h"
#include "pinconf.h"
#include "pinctrl-utils.h"

#ifdef CONFIG_DEBUG_FS

struct pin_config_item {
	const enum pin_config_param param;
	const char * const display;
	const char * const format;
	bool has_arg;
};

#define PCONFDUMP(a, b, c, d) { .param = a, .display = b, .format = c, \
				.has_arg = d }

static struct pin_config_item conf_items[] = {
	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
				"input bias pull to pin specific state", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
};

void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
			      struct seq_file *s, unsigned pin)
{
	const struct pinconf_ops *ops = pctldev->desc->confops;
	int i;

	if (!ops->is_generic)
		return;

	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
		unsigned long config;
		int ret;

		/* We want to check out this parameter */
		config = pinconf_to_config_packed(conf_items[i].param, 0);
		ret = pin_config_get_for_pin(pctldev, pin, &config);
		/* These are legal errors */
		if (ret == -EINVAL || ret == -ENOTSUPP)
			continue;
		if (ret) {
			seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
			continue;
		}
		/* Space between multiple configs */
		seq_puts(s, " ");
		seq_puts(s, conf_items[i].display);
		/* Print unit if available */
		if (conf_items[i].has_arg) {
			seq_printf(s, " (%u",
				   pinconf_to_config_argument(config));
			if (conf_items[i].format)
				seq_printf(s, " %s)", conf_items[i].format);
			else
				seq_puts(s, ")");
		}
	}
}

void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
			      struct seq_file *s, const char *gname)
{
	const struct pinconf_ops *ops = pctldev->desc->confops;
	int i;

	if (!ops->is_generic)
		return;

	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
		unsigned long config;
		int ret;

		/* We want to check out this parameter */
		config = pinconf_to_config_packed(conf_items[i].param, 0);
		ret = pin_config_group_get(dev_name(pctldev->dev), gname,
					   &config);
		/* These are legal errors */
		if (ret == -EINVAL || ret == -ENOTSUPP)
			continue;
		if (ret) {
			seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
			continue;
		}
		/* Space between multiple configs */
		seq_puts(s, " ");
		seq_puts(s, conf_items[i].display);
		/* Print unit if available */
		if (conf_items[i].has_arg) {
			seq_printf(s, " (%u",
				   pinconf_to_config_argument(config));
			if (conf_items[i].format)
				seq_printf(s, " %s)", conf_items[i].format);
			else
				seq_puts(s, ")");
		}
	}
}

void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
				 struct seq_file *s, unsigned long config)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
		if (pinconf_to_config_param(config) != conf_items[i].param)
			continue;
		seq_printf(s, "%s: 0x%x", conf_items[i].display,
			   pinconf_to_config_argument(config));
	}
}
EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
#endif

#ifdef CONFIG_OF
struct pinconf_generic_dt_params {
	const char * const property;
	enum pin_config_param param;
	u32 default_value;
};

static struct pinconf_generic_dt_params dt_params[] = {
	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
	{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
	{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0},
};

/**
 * pinconf_generic_parse_dt_config()
 * parse the config properties into generic pinconfig values.
 * @np: node containing the pinconfig properties
 * @configs: array with nconfigs entries containing the generic pinconf values
 * @nconfigs: umber of configurations
 */
int pinconf_generic_parse_dt_config(struct device_node *np,
				    unsigned long **configs,
				    unsigned int *nconfigs)
{
	unsigned long *cfg;
	unsigned int ncfg = 0;
	int ret;
	int i;
	u32 val;

	if (!np)
		return -EINVAL;

	/* allocate a temporary array big enough to hold one of each option */
	cfg = kzalloc(sizeof(*cfg) * ARRAY_SIZE(dt_params), GFP_KERNEL);
	if (!cfg)
		return -ENOMEM;

	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
		struct pinconf_generic_dt_params *par = &dt_params[i];
		ret = of_property_read_u32(np, par->property, &val);

		/* property not found */
		if (ret == -EINVAL)
			continue;

		/* use default value, when no value is specified */
		if (ret)
			val = par->default_value;

		pr_debug("found %s with value %u\n", par->property, val);
		cfg[ncfg] = pinconf_to_config_packed(par->param, val);
		ncfg++;
	}

	ret = 0;

	/* no configs found at all */
	if (ncfg == 0) {
		*configs = NULL;
		*nconfigs = 0;
		goto out;
	}

	/*
	 * Now limit the number of configs to the real number of
	 * found properties.
	 */
	*configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
	if (!*configs) {
		ret = -ENOMEM;
		goto out;
	}

	*nconfigs = ncfg;

out:
	kfree(cfg);
	return ret;
}

int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
		struct device_node *np, struct pinctrl_map **map,
		unsigned *reserved_maps, unsigned *num_maps,
		enum pinctrl_map_type type)
{
	int ret;
	const char *function;
	struct device *dev = pctldev->dev;
	unsigned long *configs = NULL;
	unsigned num_configs = 0;
	unsigned reserve;
	struct property *prop;
	const char *group;

	ret = of_property_read_string(np, "function", &function);
	if (ret < 0) {
		/* EINVAL=missing, which is fine since it's optional */
		if (ret != -EINVAL)
			dev_err(dev, "could not parse property function\n");
		function = NULL;
	}

	ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
	if (ret < 0) {
		dev_err(dev, "could not parse node property\n");
		return ret;
	}

	reserve = 0;
	if (function != NULL)
		reserve++;
	if (num_configs)
		reserve++;
	ret = of_property_count_strings(np, "pins");
	if (ret < 0) {
		dev_err(dev, "could not parse property pins\n");
		goto exit;
	}
	reserve *= ret;

	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
			num_maps, reserve);
	if (ret < 0)
		goto exit;

	of_property_for_each_string(np, "pins", prop, group) {
		if (function) {
			ret = pinctrl_utils_add_map_mux(pctldev, map,
					reserved_maps, num_maps, group,
					function);
			if (ret < 0)
				goto exit;
		}

		if (num_configs) {
			ret = pinctrl_utils_add_map_configs(pctldev, map,
					reserved_maps, num_maps, group, configs,
					num_configs, type);
			if (ret < 0)
				goto exit;
		}
	}
	ret = 0;

exit:
	kfree(configs);
	return ret;
}
EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);

int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
		struct device_node *np_config, struct pinctrl_map **map,
		unsigned *num_maps, enum pinctrl_map_type type)
{
	unsigned reserved_maps;
	struct device_node *np;
	int ret;

	reserved_maps = 0;
	*map = NULL;
	*num_maps = 0;

	for_each_child_of_node(np_config, np) {
		ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
					&reserved_maps, num_maps, type);
		if (ret < 0) {
			pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
			return ret;
		}
	}
	return 0;
}
EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);

#endif
Commit	Line	Data
394349f7 LW	1	/*
	2	* Core driver for the generic pin config portions of the pin control subsystem
	3	*
	4	* Copyright (C) 2011 ST-Ericsson SA
	5	* Written on behalf of Linaro for ST-Ericsson
	6	*
	7	* Author: Linus Walleij <linus.walleij@linaro.org>
	8	*
	9	* License terms: GNU General Public License (GPL) version 2
	10	*/
	11
	12	#define pr_fmt(fmt) "generic pinconfig core: " fmt
	13
	14	#include <linux/kernel.h>
9cfd1724	15	#include <linux/module.h>
394349f7 LW	16	#include <linux/init.h>
	17	#include <linux/device.h>
	18	#include <linux/slab.h>
	19	#include <linux/debugfs.h>
	20	#include <linux/seq_file.h>
	21	#include <linux/pinctrl/pinctrl.h>
	22	#include <linux/pinctrl/pinconf.h>
	23	#include <linux/pinctrl/pinconf-generic.h>
7db9af4b	24	#include <linux/of.h>
394349f7 LW	25	#include "core.h"
394349f7 LW	26	#include "pinconf.h"
e81c8f18	27	#include "pinctrl-utils.h"
394349f7 LW	28
	29	#ifdef CONFIG_DEBUG_FS
	30
	31	struct pin_config_item {
	32	const enum pin_config_param param;
	33	const char * const display;
	34	const char * const format;
eec45071	35	bool has_arg;
394349f7 LW	36	};
394349f7 LW	37
eec45071 SB	38	#define PCONFDUMP(a, b, c, d) { .param = a, .display = b, .format = c, \
eec45071 SB	39	.has_arg = d }
394349f7	40
1ef465c0	41	static struct pin_config_item conf_items[] = {
eec45071 SB	42	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
	43	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
	44	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
	45	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
	46	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
7970cb77	47	PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
eec45071 SB	48	"input bias pull to pin specific state", NULL, false),
	49	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
	50	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
	51	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
	52	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
	53	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
	54	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
	55	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
	56	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
	57	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
	58	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
	59	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
	60	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
394349f7 LW	61	};
	62
	63	void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
	64	struct seq_file *s, unsigned pin)
	65	{
	66	const struct pinconf_ops *ops = pctldev->desc->confops;
	67	int i;
	68
	69	if (!ops->is_generic)
	70	return;
	71
b6465424	72	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
394349f7 LW	73	unsigned long config;
	74	int ret;
	75
	76	/* We want to check out this parameter */
	77	config = pinconf_to_config_packed(conf_items[i].param, 0);
	78	ret = pin_config_get_for_pin(pctldev, pin, &config);
	79	/* These are legal errors */
	80	if (ret == -EINVAL \|\| ret == -ENOTSUPP)
	81	continue;
	82	if (ret) {
	83	seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
	84	continue;
	85	}
	86	/* Space between multiple configs */
	87	seq_puts(s, " ");
	88	seq_puts(s, conf_items[i].display);
	89	/* Print unit if available */
eec45071 SB	90	if (conf_items[i].has_arg) {
	91	seq_printf(s, " (%u",
	92	pinconf_to_config_argument(config));
	93	if (conf_items[i].format)
	94	seq_printf(s, " %s)", conf_items[i].format);
	95	else
	96	seq_puts(s, ")");
	97	}
394349f7 LW	98	}
	99	}
	100
	101	void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
	102	struct seq_file s, const char gname)
	103	{
	104	const struct pinconf_ops *ops = pctldev->desc->confops;
	105	int i;
	106
	107	if (!ops->is_generic)
	108	return;
	109
b6465424	110	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
394349f7 LW	111	unsigned long config;
	112	int ret;
	113
	114	/* We want to check out this parameter */
	115	config = pinconf_to_config_packed(conf_items[i].param, 0);
	116	ret = pin_config_group_get(dev_name(pctldev->dev), gname,
	117	&config);
	118	/* These are legal errors */
	119	if (ret == -EINVAL \|\| ret == -ENOTSUPP)
	120	continue;
	121	if (ret) {
	122	seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
	123	continue;
	124	}
	125	/* Space between multiple configs */
	126	seq_puts(s, " ");
	127	seq_puts(s, conf_items[i].display);
	128	/* Print unit if available */
eec45071 SB	129	if (conf_items[i].has_arg) {
	130	seq_printf(s, " (%u",
	131	pinconf_to_config_argument(config));
	132	if (conf_items[i].format)
	133	seq_printf(s, " %s)", conf_items[i].format);
	134	else
	135	seq_puts(s, ")");
	136	}
394349f7 LW	137	}
	138	}
	139
9cfd1724 HZ	140	void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
	141	struct seq_file *s, unsigned long config)
	142	{
	143	int i;
	144
b6465424	145	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
9cfd1724 HZ	146	if (pinconf_to_config_param(config) != conf_items[i].param)
	147	continue;
	148	seq_printf(s, "%s: 0x%x", conf_items[i].display,
	149	pinconf_to_config_argument(config));
	150	}
	151	}
	152	EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
394349f7	153	#endif
7db9af4b HS	154
	155	#ifdef CONFIG_OF
	156	struct pinconf_generic_dt_params {
	157	const char * const property;
	158	enum pin_config_param param;
	159	u32 default_value;
	160	};
	161
	162	static struct pinconf_generic_dt_params dt_params[] = {
	163	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
	164	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
	165	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
9ee1f7d2 HS	166	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
	167	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
	168	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
7db9af4b HS	169	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
	170	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
	171	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
	172	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
8ba3f4d0 SY	173	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
8ba3f4d0 SY	174	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
7db9af4b HS	175	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
7db9af4b HS	176	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
7db9af4b	177	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
ca6c5518	178	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
9ee1f7d2 HS	179	{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
9ee1f7d2 HS	180	{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
7db9af4b HS	181	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
7db9af4b HS	182	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
8ba3f4d0	183	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0},
7db9af4b HS	184	};
	185
	186	/**
	187	* pinconf_generic_parse_dt_config()
	188	* parse the config properties into generic pinconfig values.
	189	* @np: node containing the pinconfig properties
	190	* @configs: array with nconfigs entries containing the generic pinconf values
	191	* @nconfigs: umber of configurations
	192	*/
	193	int pinconf_generic_parse_dt_config(struct device_node *np,
	194	unsigned long **configs,
	195	unsigned int *nconfigs)
	196	{
6abab2d4	197	unsigned long *cfg;
7db9af4b HS	198	unsigned int ncfg = 0;
	199	int ret;
	200	int i;
	201	u32 val;
	202
	203	if (!np)
	204	return -EINVAL;
	205
6abab2d4 HS	206	/* allocate a temporary array big enough to hold one of each option */
	207	cfg = kzalloc(sizeof(cfg) ARRAY_SIZE(dt_params), GFP_KERNEL);
	208	if (!cfg)
	209	return -ENOMEM;
	210
7db9af4b HS	211	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
	212	struct pinconf_generic_dt_params *par = &dt_params[i];
	213	ret = of_property_read_u32(np, par->property, &val);
	214
	215	/* property not found */
	216	if (ret == -EINVAL)
	217	continue;
	218
	219	/* use default value, when no value is specified */
	220	if (ret)
	221	val = par->default_value;
	222
	223	pr_debug("found %s with value %u\n", par->property, val);
	224	cfg[ncfg] = pinconf_to_config_packed(par->param, val);
	225	ncfg++;
	226	}
	227
6abab2d4 HS	228	ret = 0;
6abab2d4 HS	229
e4a8844c HS	230	/* no configs found at all */
	231	if (ncfg == 0) {
	232	*configs = NULL;
	233	*nconfigs = 0;
6abab2d4	234	goto out;
e4a8844c HS	235	}
e4a8844c HS	236
7db9af4b HS	237	/*
	238	* Now limit the number of configs to the real number of
	239	* found properties.
	240	*/
db388dfb	241	configs = kmemdup(cfg, ncfg sizeof(unsigned long), GFP_KERNEL);
6abab2d4 HS	242	if (!*configs) {
	243	ret = -ENOMEM;
	244	goto out;
	245	}
7db9af4b	246
7db9af4b	247	*nconfigs = ncfg;
6abab2d4 HS	248
	249	out:
	250	kfree(cfg);
	251	return ret;
7db9af4b	252	}
e81c8f18 LD	253
	254	int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
	255	struct device_node np, struct pinctrl_map *map,
3287c240 LD	256	unsigned reserved_maps, unsigned num_maps,
3287c240 LD	257	enum pinctrl_map_type type)
e81c8f18 LD	258	{
	259	int ret;
	260	const char *function;
	261	struct device *dev = pctldev->dev;
	262	unsigned long *configs = NULL;
	263	unsigned num_configs = 0;
	264	unsigned reserve;
	265	struct property *prop;
	266	const char *group;
	267
	268	ret = of_property_read_string(np, "function", &function);
	269	if (ret < 0) {
	270	/* EINVAL=missing, which is fine since it's optional */
	271	if (ret != -EINVAL)
acf564a8	272	dev_err(dev, "could not parse property function\n");
e81c8f18 LD	273	function = NULL;
	274	}
	275
	276	ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
	277	if (ret < 0) {
	278	dev_err(dev, "could not parse node property\n");
	279	return ret;
	280	}
	281
	282	reserve = 0;
	283	if (function != NULL)
	284	reserve++;
	285	if (num_configs)
	286	reserve++;
	287	ret = of_property_count_strings(np, "pins");
	288	if (ret < 0) {
acf564a8	289	dev_err(dev, "could not parse property pins\n");
e81c8f18 LD	290	goto exit;
	291	}
	292	reserve *= ret;
	293
	294	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
	295	num_maps, reserve);
	296	if (ret < 0)
	297	goto exit;
	298
	299	of_property_for_each_string(np, "pins", prop, group) {
	300	if (function) {
	301	ret = pinctrl_utils_add_map_mux(pctldev, map,
	302	reserved_maps, num_maps, group,
	303	function);
	304	if (ret < 0)
	305	goto exit;
	306	}
	307
	308	if (num_configs) {
	309	ret = pinctrl_utils_add_map_configs(pctldev, map,
	310	reserved_maps, num_maps, group, configs,
3287c240	311	num_configs, type);
e81c8f18 LD	312	if (ret < 0)
	313	goto exit;
	314	}
	315	}
	316	ret = 0;
	317
	318	exit:
	319	kfree(configs);
	320	return ret;
	321	}
	322	EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
	323
	324	int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
	325	struct device_node np_config, struct pinctrl_map *map,
3287c240	326	unsigned *num_maps, enum pinctrl_map_type type)
e81c8f18 LD	327	{
	328	unsigned reserved_maps;
	329	struct device_node *np;
	330	int ret;
	331
	332	reserved_maps = 0;
	333	*map = NULL;
	334	*num_maps = 0;
	335
	336	for_each_child_of_node(np_config, np) {
	337	ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
3287c240	338	&reserved_maps, num_maps, type);
e81c8f18 LD	339	if (ret < 0) {
	340	pinctrl_utils_dt_free_map(pctldev, map, num_maps);
	341	return ret;
	342	}
	343	}
	344	return 0;
	345	}
	346	EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
	347
7db9af4b	348	#endif