[linux-2.6-block.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
static const struct pin_config_item conf_items[] = {
	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
	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_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_BIAS_PULL_UP, "input bias pull up", NULL, false),
	PCONFDUMP(PIN_CONFIG_BIDIRECTIONAL, "bi-directional pin operations", 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_PUSH_PULL, "output drive push pull", NULL, false),
	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
};

static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
				     struct seq_file *s, const char *gname,
				     unsigned pin,
				     const struct pin_config_item *items,
				     int nitems, int *print_sep)
{
	int i;

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

		/* We want to check out this parameter */
		config = pinconf_to_config_packed(items[i].param, 0);
		if (gname)
			ret = pin_config_group_get(dev_name(pctldev->dev),
						   gname, &config);
		else
			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;
		}
		/* comma between multiple configs */
		if (*print_sep)
			seq_puts(s, ", ");
		*print_sep = 1;
		seq_puts(s, items[i].display);
		/* Print unit if available */
		if (items[i].has_arg) {
			seq_printf(s, " (%u",
				   pinconf_to_config_argument(config));
			if (items[i].format)
				seq_printf(s, " %s)", items[i].format);
			else
				seq_puts(s, ")");
		}
	}
}

/**
 * pinconf_generic_dump_pins - Print information about pin or group of pins
 * @pctldev:	Pincontrol device
 * @s:		File to print to
 * @gname:	Group name specifying pins
 * @pin:	Pin number specyfying pin
 *
 * Print the pinconf configuration for the requested pin(s) to @s. Pins can be
 * specified either by pin using @pin or by group using @gname. Only one needs
 * to be specified the other can be NULL/0.
 */
void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
			       const char *gname, unsigned pin)
{
	const struct pinconf_ops *ops = pctldev->desc->confops;
	int print_sep = 0;

	if (!ops->is_generic)
		return;

	/* generic parameters */
	pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
				 ARRAY_SIZE(conf_items), &print_sep);
	/* driver-specific parameters */
	if (pctldev->desc->num_custom_params &&
	    pctldev->desc->custom_conf_items)
		pinconf_generic_dump_one(pctldev, s, gname, pin,
					 pctldev->desc->custom_conf_items,
					 pctldev->desc->num_custom_params,
					 &print_sep);
}

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));
	}

	if (!pctldev->desc->num_custom_params ||
	    !pctldev->desc->custom_conf_items)
		return;

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

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

/**
 * parse_dt_cfg() - Parse DT pinconf parameters
 * @np:	DT node
 * @params:	Array of describing generic parameters
 * @count:	Number of entries in @params
 * @cfg:	Array of parsed config options
 * @ncfg:	Number of entries in @cfg
 *
 * Parse the config options described in @params from @np and puts the result
 * in @cfg. @cfg does not need to be empty, entries are added beginning at
 * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
 * needs to have enough memory allocated to hold all possible entries.
 */
static void parse_dt_cfg(struct device_node *np,
			 const struct pinconf_generic_params *params,
			 unsigned int count, unsigned long *cfg,
			 unsigned int *ncfg)
{
	int i;

	for (i = 0; i < count; i++) {
		u32 val;
		int ret;
		const struct pinconf_generic_params *par = &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)++;
	}
}

/**
 * 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
 *           must be freed when no longer necessary.
 * @nconfigs: umber of configurations
 */
int pinconf_generic_parse_dt_config(struct device_node *np,
				    struct pinctrl_dev *pctldev,
				    unsigned long **configs,
				    unsigned int *nconfigs)
{
	unsigned long *cfg;
	unsigned int max_cfg, ncfg = 0;
	int ret;

	if (!np)
		return -EINVAL;

	/* allocate a temporary array big enough to hold one of each option */
	max_cfg = ARRAY_SIZE(dt_params);
	if (pctldev)
		max_cfg += pctldev->desc->num_custom_params;
	cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
	if (!cfg)
		return -ENOMEM;

	parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
	if (pctldev && pctldev->desc->num_custom_params &&
		pctldev->desc->custom_params)
		parse_dt_cfg(np, pctldev->desc->custom_params,
			     pctldev->desc->num_custom_params, cfg, &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, strings_count;
	struct property *prop;
	const char *group;
	const char *subnode_target_type = "pins";

	ret = of_property_count_strings(np, "pins");
	if (ret < 0) {
		ret = of_property_count_strings(np, "groups");
		if (ret < 0)
			/* skip this node; may contain config child nodes */
			return 0;
		if (type == PIN_MAP_TYPE_INVALID)
			type = PIN_MAP_TYPE_CONFIGS_GROUP;
		subnode_target_type = "groups";
	} else {
		if (type == PIN_MAP_TYPE_INVALID)
			type = PIN_MAP_TYPE_CONFIGS_PIN;
	}
	strings_count = ret;

	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, "%s: could not parse property function\n",
				of_node_full_name(np));
		function = NULL;
	}

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

	reserve = 0;
	if (function != NULL)
		reserve++;
	if (num_configs)
		reserve++;

	reserve *= strings_count;

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

	of_property_for_each_string(np, subnode_target_type, 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;

	ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
						&reserved_maps, num_maps, type);
	if (ret < 0)
		goto exit;

	for_each_available_child_of_node(np_config, np) {
		ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
					&reserved_maps, num_maps, type);
		if (ret < 0)
			goto exit;
	}
	return 0;

exit:
	pinctrl_utils_free_map(pctldev, *map, *num_maps);
	return ret;
}
EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);

void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev,
				 struct pinctrl_map *map,
				 unsigned num_maps)
{
	pinctrl_utils_free_map(pctldev, map, num_maps);
}
EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_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
394349f7 LW	29	#ifdef CONFIG_DEBUG_FS
2500bcc9	30	static const struct pin_config_item conf_items[] = {
3c4b23dd	31	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
eec45071 SB	32	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
eec45071 SB	33	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
eec45071	34	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
7970cb77	35	PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
eec45071	36	"input bias pull to pin specific state", NULL, false),
3c4b23dd	37	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
8c58f1a7	38	PCONFDUMP(PIN_CONFIG_BIDIRECTIONAL, "bi-directional pin operations", NULL, false),
eec45071 SB	39	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
eec45071 SB	40	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
3c4b23dd	41	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
eec45071	42	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
3c4b23dd	43	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
eec45071	44	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
eec45071	45	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
3c4b23dd	46	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
eec45071 SB	47	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
eec45071 SB	48	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
3c4b23dd MY	49	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
3c4b23dd MY	50	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
394349f7 LW	51	};
394349f7 LW	52
dd4d01f7 SB	53	static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
	54	struct seq_file s, const char gname,
	55	unsigned pin,
	56	const struct pin_config_item *items,
a672eb5e	57	int nitems, int *print_sep)
394349f7	58	{
394349f7 LW	59	int i;
394349f7 LW	60
dd4d01f7	61	for (i = 0; i < nitems; i++) {
394349f7 LW	62	unsigned long config;
	63	int ret;
	64
	65	/* We want to check out this parameter */
dd4d01f7 SB	66	config = pinconf_to_config_packed(items[i].param, 0);
	67	if (gname)
	68	ret = pin_config_group_get(dev_name(pctldev->dev),
	69	gname, &config);
	70	else
	71	ret = pin_config_get_for_pin(pctldev, pin, &config);
394349f7 LW	72	/* These are legal errors */
	73	if (ret == -EINVAL \|\| ret == -ENOTSUPP)
	74	continue;
	75	if (ret) {
	76	seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
	77	continue;
	78	}
a672eb5e MY	79	/* comma between multiple configs */
	80	if (*print_sep)
	81	seq_puts(s, ", ");
	82	*print_sep = 1;
dd4d01f7	83	seq_puts(s, items[i].display);
394349f7	84	/* Print unit if available */
dd4d01f7	85	if (items[i].has_arg) {
eec45071 SB	86	seq_printf(s, " (%u",
eec45071 SB	87	pinconf_to_config_argument(config));
dd4d01f7 SB	88	if (items[i].format)
dd4d01f7 SB	89	seq_printf(s, " %s)", items[i].format);
eec45071 SB	90	else
	91	seq_puts(s, ")");
	92	}
394349f7 LW	93	}
	94	}
	95
dd4d01f7 SB	96	/**
	97	* pinconf_generic_dump_pins - Print information about pin or group of pins
	98	* @pctldev: Pincontrol device
	99	* @s: File to print to
	100	* @gname: Group name specifying pins
	101	* @pin: Pin number specyfying pin
	102	*
	103	* Print the pinconf configuration for the requested pin(s) to @s. Pins can be
	104	* specified either by pin using @pin or by group using @gname. Only one needs
	105	* to be specified the other can be NULL/0.
	106	*/
	107	void pinconf_generic_dump_pins(struct pinctrl_dev pctldev, struct seq_file s,
	108	const char *gname, unsigned pin)
394349f7 LW	109	{
394349f7 LW	110	const struct pinconf_ops *ops = pctldev->desc->confops;
a672eb5e	111	int print_sep = 0;
394349f7 LW	112
	113	if (!ops->is_generic)
	114	return;
	115
dd4d01f7 SB	116	/* generic parameters */
dd4d01f7 SB	117	pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
a672eb5e	118	ARRAY_SIZE(conf_items), &print_sep);
dd4d01f7	119	/* driver-specific parameters */
f684e4ac LW	120	if (pctldev->desc->num_custom_params &&
f684e4ac LW	121	pctldev->desc->custom_conf_items)
dd4d01f7	122	pinconf_generic_dump_one(pctldev, s, gname, pin,
f684e4ac	123	pctldev->desc->custom_conf_items,
a672eb5e MY	124	pctldev->desc->num_custom_params,
a672eb5e MY	125	&print_sep);
394349f7 LW	126	}
394349f7 LW	127
9cfd1724 HZ	128	void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
	129	struct seq_file *s, unsigned long config)
	130	{
	131	int i;
	132
b6465424	133	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
9cfd1724 HZ	134	if (pinconf_to_config_param(config) != conf_items[i].param)
	135	continue;
	136	seq_printf(s, "%s: 0x%x", conf_items[i].display,
	137	pinconf_to_config_argument(config));
	138	}
dd4d01f7	139
f684e4ac LW	140	if (!pctldev->desc->num_custom_params \|\|
f684e4ac LW	141	!pctldev->desc->custom_conf_items)
dd4d01f7 SB	142	return;
dd4d01f7 SB	143
f684e4ac LW	144	for (i = 0; i < pctldev->desc->num_custom_params; i++) {
	145	if (pinconf_to_config_param(config) !=
	146	pctldev->desc->custom_conf_items[i].param)
dd4d01f7	147	continue;
f684e4ac LW	148	seq_printf(s, "%s: 0x%x",
	149	pctldev->desc->custom_conf_items[i].display,
	150	pinconf_to_config_argument(config));
dd4d01f7	151	}
9cfd1724 HZ	152	}
9cfd1724 HZ	153	EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
394349f7	154	#endif
7db9af4b HS	155
7db9af4b HS	156	#ifdef CONFIG_OF
f684e4ac	157	static const struct pinconf_generic_params dt_params[] = {
3c4b23dd	158	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
7db9af4b HS	159	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
7db9af4b HS	160	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
9ee1f7d2	161	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
9ee1f7d2	162	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
3c4b23dd	163	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
8c58f1a7	164	{ "bi-directional", PIN_CONFIG_BIDIRECTIONAL, 1 },
7db9af4b HS	165	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
7db9af4b HS	166	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
3c4b23dd	167	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
7db9af4b	168	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
3c4b23dd	169	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
8ba3f4d0	170	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
3c4b23dd	171	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
69c308e2	172	{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
7db9af4b	173	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
3c4b23dd	174	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
9ee1f7d2	175	{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
3c4b23dd	176	{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
8c58f1a7	177	{ "output-enable", PIN_CONFIG_OUTPUT, 1, },
7db9af4b	178	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
3c4b23dd MY	179	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
	180	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
	181	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
7db9af4b HS	182	};
7db9af4b HS	183
dd4d01f7	184	/**
f684e4ac	185	* parse_dt_cfg() - Parse DT pinconf parameters
dd4d01f7	186	* @np: DT node
f684e4ac	187	* @params: Array of describing generic parameters
dd4d01f7 SB	188	* @count: Number of entries in @params
	189	* @cfg: Array of parsed config options
	190	* @ncfg: Number of entries in @cfg
	191	*
	192	* Parse the config options described in @params from @np and puts the result
3ec440e3	193	* in @cfg. @cfg does not need to be empty, entries are added beginning at
dd4d01f7 SB	194	* @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
	195	* needs to have enough memory allocated to hold all possible entries.
	196	*/
	197	static void parse_dt_cfg(struct device_node *np,
f684e4ac	198	const struct pinconf_generic_params *params,
dd4d01f7 SB	199	unsigned int count, unsigned long *cfg,
	200	unsigned int *ncfg)
	201	{
	202	int i;
	203
	204	for (i = 0; i < count; i++) {
	205	u32 val;
	206	int ret;
f684e4ac	207	const struct pinconf_generic_params *par = &params[i];
dd4d01f7 SB	208
	209	ret = of_property_read_u32(np, par->property, &val);
	210
	211	/* property not found */
	212	if (ret == -EINVAL)
	213	continue;
	214
	215	/* use default value, when no value is specified */
	216	if (ret)
	217	val = par->default_value;
	218
	219	pr_debug("found %s with value %u\n", par->property, val);
	220	cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
	221	(*ncfg)++;
	222	}
	223	}
	224
7db9af4b HS	225	/**
	226	* pinconf_generic_parse_dt_config()
	227	* parse the config properties into generic pinconfig values.
	228	* @np: node containing the pinconfig properties
	229	* @configs: array with nconfigs entries containing the generic pinconf values
d9ac5e25	230	* must be freed when no longer necessary.
7db9af4b HS	231	* @nconfigs: umber of configurations
	232	*/
	233	int pinconf_generic_parse_dt_config(struct device_node *np,
dd4d01f7	234	struct pinctrl_dev *pctldev,
7db9af4b HS	235	unsigned long **configs,
	236	unsigned int *nconfigs)
	237	{
6abab2d4	238	unsigned long *cfg;
dd4d01f7	239	unsigned int max_cfg, ncfg = 0;
7db9af4b	240	int ret;
7db9af4b HS	241
	242	if (!np)
	243	return -EINVAL;
	244
6abab2d4	245	/* allocate a temporary array big enough to hold one of each option */
dd4d01f7 SB	246	max_cfg = ARRAY_SIZE(dt_params);
dd4d01f7 SB	247	if (pctldev)
f684e4ac	248	max_cfg += pctldev->desc->num_custom_params;
dd4d01f7	249	cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
6abab2d4 HS	250	if (!cfg)
	251	return -ENOMEM;
	252
dd4d01f7	253	parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
f684e4ac LW	254	if (pctldev && pctldev->desc->num_custom_params &&
	255	pctldev->desc->custom_params)
	256	parse_dt_cfg(np, pctldev->desc->custom_params,
	257	pctldev->desc->num_custom_params, cfg, &ncfg);
7db9af4b	258
6abab2d4 HS	259	ret = 0;
6abab2d4 HS	260
e4a8844c HS	261	/* no configs found at all */
	262	if (ncfg == 0) {
	263	*configs = NULL;
	264	*nconfigs = 0;
6abab2d4	265	goto out;
e4a8844c HS	266	}
e4a8844c HS	267
7db9af4b HS	268	/*
	269	* Now limit the number of configs to the real number of
	270	* found properties.
	271	*/
db388dfb	272	configs = kmemdup(cfg, ncfg sizeof(unsigned long), GFP_KERNEL);
6abab2d4 HS	273	if (!*configs) {
	274	ret = -ENOMEM;
	275	goto out;
	276	}
7db9af4b	277
7db9af4b	278	*nconfigs = ncfg;
6abab2d4 HS	279
	280	out:
	281	kfree(cfg);
	282	return ret;
7db9af4b	283	}
e81c8f18 LD	284
	285	int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
	286	struct device_node np, struct pinctrl_map *map,
3287c240 LD	287	unsigned reserved_maps, unsigned num_maps,
3287c240 LD	288	enum pinctrl_map_type type)
e81c8f18 LD	289	{
	290	int ret;
	291	const char *function;
	292	struct device *dev = pctldev->dev;
	293	unsigned long *configs = NULL;
	294	unsigned num_configs = 0;
c7289500	295	unsigned reserve, strings_count;
e81c8f18 LD	296	struct property *prop;
e81c8f18 LD	297	const char *group;
31c89c95	298	const char *subnode_target_type = "pins";
e81c8f18	299
c7289500 BS	300	ret = of_property_count_strings(np, "pins");
	301	if (ret < 0) {
	302	ret = of_property_count_strings(np, "groups");
	303	if (ret < 0)
	304	/* skip this node; may contain config child nodes */
	305	return 0;
	306	if (type == PIN_MAP_TYPE_INVALID)
	307	type = PIN_MAP_TYPE_CONFIGS_GROUP;
	308	subnode_target_type = "groups";
	309	} else {
	310	if (type == PIN_MAP_TYPE_INVALID)
	311	type = PIN_MAP_TYPE_CONFIGS_PIN;
	312	}
	313	strings_count = ret;
	314
e81c8f18 LD	315	ret = of_property_read_string(np, "function", &function);
	316	if (ret < 0) {
	317	/* EINVAL=missing, which is fine since it's optional */
	318	if (ret != -EINVAL)
4024efb4 BS	319	dev_err(dev, "%s: could not parse property function\n",
4024efb4 BS	320	of_node_full_name(np));
e81c8f18 LD	321	function = NULL;
	322	}
	323
dd4d01f7 SB	324	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
dd4d01f7 SB	325	&num_configs);
e81c8f18	326	if (ret < 0) {
4024efb4 BS	327	dev_err(dev, "%s: could not parse node property\n",
4024efb4 BS	328	of_node_full_name(np));
e81c8f18 LD	329	return ret;
	330	}
	331
	332	reserve = 0;
	333	if (function != NULL)
	334	reserve++;
	335	if (num_configs)
	336	reserve++;
31c89c95	337
c7289500	338	reserve *= strings_count;
e81c8f18 LD	339
	340	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
	341	num_maps, reserve);
	342	if (ret < 0)
	343	goto exit;
	344
31c89c95	345	of_property_for_each_string(np, subnode_target_type, prop, group) {
e81c8f18 LD	346	if (function) {
	347	ret = pinctrl_utils_add_map_mux(pctldev, map,
	348	reserved_maps, num_maps, group,
	349	function);
	350	if (ret < 0)
	351	goto exit;
	352	}
	353
	354	if (num_configs) {
	355	ret = pinctrl_utils_add_map_configs(pctldev, map,
	356	reserved_maps, num_maps, group, configs,
3287c240	357	num_configs, type);
e81c8f18 LD	358	if (ret < 0)
	359	goto exit;
	360	}
	361	}
	362	ret = 0;
	363
	364	exit:
	365	kfree(configs);
	366	return ret;
	367	}
	368	EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
	369
	370	int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
	371	struct device_node np_config, struct pinctrl_map *map,
3287c240	372	unsigned *num_maps, enum pinctrl_map_type type)
e81c8f18 LD	373	{
	374	unsigned reserved_maps;
	375	struct device_node *np;
	376	int ret;
	377
	378	reserved_maps = 0;
	379	*map = NULL;
	380	*num_maps = 0;
	381
c7289500 BS	382	ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
	383	&reserved_maps, num_maps, type);
	384	if (ret < 0)
	385	goto exit;
	386
e06c2ee5	387	for_each_available_child_of_node(np_config, np) {
e81c8f18	388	ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
3287c240	389	&reserved_maps, num_maps, type);
c7289500 BS	390	if (ret < 0)
c7289500 BS	391	goto exit;
e81c8f18 LD	392	}
e81c8f18 LD	393	return 0;
c7289500 BS	394
c7289500 BS	395	exit:
d32f7fd3	396	pinctrl_utils_free_map(pctldev, map, num_maps);
c7289500	397	return ret;
e81c8f18 LD	398	}
	399	EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
	400
8dfebf57 JH	401	void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev,
	402	struct pinctrl_map *map,
	403	unsigned num_maps)
	404	{
	405	pinctrl_utils_free_map(pctldev, map, num_maps);
	406	}
	407	EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map);
	408
7db9af4b	409	#endif