[mirror_ubuntu-bionic-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
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_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_ENABLE, "output enabled", NULL, false),
	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
	PCONFDUMP(PIN_CONFIG_SLEEP_HARDWARE_STATE, "sleep hardware state", NULL, false),
	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
	PCONFDUMP(PIN_CONFIG_SKEW_DELAY, "skew delay", 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 },
	{ "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-disable", PIN_CONFIG_OUTPUT_ENABLE, 0 },
	{ "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 },
	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
	{ "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 },
	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
	{ "skew-delay", PIN_CONFIG_SKEW_DELAY, 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, "%pOF: could not parse property function\n",
				np);
		function = NULL;
	}

	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
					      &num_configs);
	if (ret < 0) {
		dev_err(dev, "%pOF: could not parse node property\n", 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),
eec45071 SB	38	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
eec45071 SB	39	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
3c4b23dd	40	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
eec45071	41	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
3c4b23dd	42	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
eec45071	43	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
eec45071	44	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
3c4b23dd	45	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
eec45071	46	PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
42556242	47	PCONFDUMP(PIN_CONFIG_OUTPUT_ENABLE, "output enabled", NULL, false),
eec45071	48	PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
3c4b23dd	49	PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
6606bc9d	50	PCONFDUMP(PIN_CONFIG_SLEEP_HARDWARE_STATE, "sleep hardware state", NULL, false),
3c4b23dd	51	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
e0e1e39d	52	PCONFDUMP(PIN_CONFIG_SKEW_DELAY, "skew delay", NULL, true),
394349f7 LW	53	};
394349f7 LW	54
dd4d01f7 SB	55	static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
	56	struct seq_file s, const char gname,
	57	unsigned pin,
	58	const struct pin_config_item *items,
a672eb5e	59	int nitems, int *print_sep)
394349f7	60	{
394349f7 LW	61	int i;
394349f7 LW	62
dd4d01f7	63	for (i = 0; i < nitems; i++) {
394349f7 LW	64	unsigned long config;
	65	int ret;
	66
	67	/* We want to check out this parameter */
dd4d01f7 SB	68	config = pinconf_to_config_packed(items[i].param, 0);
	69	if (gname)
	70	ret = pin_config_group_get(dev_name(pctldev->dev),
	71	gname, &config);
	72	else
	73	ret = pin_config_get_for_pin(pctldev, pin, &config);
394349f7 LW	74	/* These are legal errors */
	75	if (ret == -EINVAL \|\| ret == -ENOTSUPP)
	76	continue;
	77	if (ret) {
	78	seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
	79	continue;
	80	}
a672eb5e MY	81	/* comma between multiple configs */
	82	if (*print_sep)
	83	seq_puts(s, ", ");
	84	*print_sep = 1;
dd4d01f7	85	seq_puts(s, items[i].display);
394349f7	86	/* Print unit if available */
dd4d01f7	87	if (items[i].has_arg) {
eec45071 SB	88	seq_printf(s, " (%u",
eec45071 SB	89	pinconf_to_config_argument(config));
dd4d01f7 SB	90	if (items[i].format)
dd4d01f7 SB	91	seq_printf(s, " %s)", items[i].format);
eec45071 SB	92	else
	93	seq_puts(s, ")");
	94	}
394349f7 LW	95	}
	96	}
	97
dd4d01f7 SB	98	/**
	99	* pinconf_generic_dump_pins - Print information about pin or group of pins
	100	* @pctldev: Pincontrol device
	101	* @s: File to print to
	102	* @gname: Group name specifying pins
	103	* @pin: Pin number specyfying pin
	104	*
	105	* Print the pinconf configuration for the requested pin(s) to @s. Pins can be
	106	* specified either by pin using @pin or by group using @gname. Only one needs
	107	* to be specified the other can be NULL/0.
	108	*/
	109	void pinconf_generic_dump_pins(struct pinctrl_dev pctldev, struct seq_file s,
	110	const char *gname, unsigned pin)
394349f7 LW	111	{
394349f7 LW	112	const struct pinconf_ops *ops = pctldev->desc->confops;
a672eb5e	113	int print_sep = 0;
394349f7 LW	114
	115	if (!ops->is_generic)
	116	return;
	117
dd4d01f7 SB	118	/* generic parameters */
dd4d01f7 SB	119	pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
a672eb5e	120	ARRAY_SIZE(conf_items), &print_sep);
dd4d01f7	121	/* driver-specific parameters */
f684e4ac LW	122	if (pctldev->desc->num_custom_params &&
f684e4ac LW	123	pctldev->desc->custom_conf_items)
dd4d01f7	124	pinconf_generic_dump_one(pctldev, s, gname, pin,
f684e4ac	125	pctldev->desc->custom_conf_items,
a672eb5e MY	126	pctldev->desc->num_custom_params,
a672eb5e MY	127	&print_sep);
394349f7 LW	128	}
394349f7 LW	129
9cfd1724 HZ	130	void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
	131	struct seq_file *s, unsigned long config)
	132	{
	133	int i;
	134
b6465424	135	for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
9cfd1724 HZ	136	if (pinconf_to_config_param(config) != conf_items[i].param)
	137	continue;
	138	seq_printf(s, "%s: 0x%x", conf_items[i].display,
	139	pinconf_to_config_argument(config));
	140	}
dd4d01f7	141
f684e4ac LW	142	if (!pctldev->desc->num_custom_params \|\|
f684e4ac LW	143	!pctldev->desc->custom_conf_items)
dd4d01f7 SB	144	return;
dd4d01f7 SB	145
f684e4ac LW	146	for (i = 0; i < pctldev->desc->num_custom_params; i++) {
	147	if (pinconf_to_config_param(config) !=
	148	pctldev->desc->custom_conf_items[i].param)
dd4d01f7	149	continue;
f684e4ac LW	150	seq_printf(s, "%s: 0x%x",
	151	pctldev->desc->custom_conf_items[i].display,
	152	pinconf_to_config_argument(config));
dd4d01f7	153	}
9cfd1724 HZ	154	}
9cfd1724 HZ	155	EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
394349f7	156	#endif
7db9af4b HS	157
7db9af4b HS	158	#ifdef CONFIG_OF
f684e4ac	159	static const struct pinconf_generic_params dt_params[] = {
3c4b23dd	160	{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
7db9af4b HS	161	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
7db9af4b HS	162	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
9ee1f7d2	163	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
9ee1f7d2	164	{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
3c4b23dd	165	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
7db9af4b HS	166	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
7db9af4b HS	167	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
3c4b23dd	168	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
7db9af4b	169	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
3c4b23dd	170	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
8ba3f4d0	171	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
3c4b23dd	172	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
69c308e2	173	{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
7db9af4b	174	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
3c4b23dd	175	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
9ee1f7d2	176	{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
3c4b23dd	177	{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
42556242 JM	178	{ "output-disable", PIN_CONFIG_OUTPUT_ENABLE, 0 },
42556242 JM	179	{ "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 },
7db9af4b	180	{ "output-high", PIN_CONFIG_OUTPUT, 1, },
3c4b23dd MY	181	{ "output-low", PIN_CONFIG_OUTPUT, 0, },
3c4b23dd MY	182	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
6606bc9d	183	{ "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 },
3c4b23dd	184	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
e0e1e39d	185	{ "skew-delay", PIN_CONFIG_SKEW_DELAY, 0 },
7db9af4b HS	186	};
7db9af4b HS	187
dd4d01f7	188	/**
f684e4ac	189	* parse_dt_cfg() - Parse DT pinconf parameters
dd4d01f7	190	* @np: DT node
f684e4ac	191	* @params: Array of describing generic parameters
dd4d01f7 SB	192	* @count: Number of entries in @params
	193	* @cfg: Array of parsed config options
	194	* @ncfg: Number of entries in @cfg
	195	*
	196	* Parse the config options described in @params from @np and puts the result
3ec440e3	197	* in @cfg. @cfg does not need to be empty, entries are added beginning at
dd4d01f7 SB	198	* @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
	199	* needs to have enough memory allocated to hold all possible entries.
	200	*/
	201	static void parse_dt_cfg(struct device_node *np,
f684e4ac	202	const struct pinconf_generic_params *params,
dd4d01f7 SB	203	unsigned int count, unsigned long *cfg,
	204	unsigned int *ncfg)
	205	{
	206	int i;
	207
	208	for (i = 0; i < count; i++) {
	209	u32 val;
	210	int ret;
f684e4ac	211	const struct pinconf_generic_params *par = &params[i];
dd4d01f7 SB	212
	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	}
	228
7db9af4b HS	229	/**
	230	* pinconf_generic_parse_dt_config()
	231	* parse the config properties into generic pinconfig values.
	232	* @np: node containing the pinconfig properties
	233	* @configs: array with nconfigs entries containing the generic pinconf values
d9ac5e25	234	* must be freed when no longer necessary.
7db9af4b HS	235	* @nconfigs: umber of configurations
	236	*/
	237	int pinconf_generic_parse_dt_config(struct device_node *np,
dd4d01f7	238	struct pinctrl_dev *pctldev,
7db9af4b HS	239	unsigned long **configs,
	240	unsigned int *nconfigs)
	241	{
6abab2d4	242	unsigned long *cfg;
dd4d01f7	243	unsigned int max_cfg, ncfg = 0;
7db9af4b	244	int ret;
7db9af4b HS	245
	246	if (!np)
	247	return -EINVAL;
	248
6abab2d4	249	/* allocate a temporary array big enough to hold one of each option */
dd4d01f7 SB	250	max_cfg = ARRAY_SIZE(dt_params);
dd4d01f7 SB	251	if (pctldev)
f684e4ac	252	max_cfg += pctldev->desc->num_custom_params;
dd4d01f7	253	cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
6abab2d4 HS	254	if (!cfg)
	255	return -ENOMEM;
	256
dd4d01f7	257	parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
f684e4ac LW	258	if (pctldev && pctldev->desc->num_custom_params &&
	259	pctldev->desc->custom_params)
	260	parse_dt_cfg(np, pctldev->desc->custom_params,
	261	pctldev->desc->num_custom_params, cfg, &ncfg);
7db9af4b	262
6abab2d4 HS	263	ret = 0;
6abab2d4 HS	264
e4a8844c HS	265	/* no configs found at all */
	266	if (ncfg == 0) {
	267	*configs = NULL;
	268	*nconfigs = 0;
6abab2d4	269	goto out;
e4a8844c HS	270	}
e4a8844c HS	271
7db9af4b HS	272	/*
	273	* Now limit the number of configs to the real number of
	274	* found properties.
	275	*/
db388dfb	276	configs = kmemdup(cfg, ncfg sizeof(unsigned long), GFP_KERNEL);
6abab2d4 HS	277	if (!*configs) {
	278	ret = -ENOMEM;
	279	goto out;
	280	}
7db9af4b	281
7db9af4b	282	*nconfigs = ncfg;
6abab2d4 HS	283
	284	out:
	285	kfree(cfg);
	286	return ret;
7db9af4b	287	}
e81c8f18 LD	288
	289	int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
	290	struct device_node np, struct pinctrl_map *map,
3287c240 LD	291	unsigned reserved_maps, unsigned num_maps,
3287c240 LD	292	enum pinctrl_map_type type)
e81c8f18 LD	293	{
	294	int ret;
	295	const char *function;
	296	struct device *dev = pctldev->dev;
	297	unsigned long *configs = NULL;
	298	unsigned num_configs = 0;
c7289500	299	unsigned reserve, strings_count;
e81c8f18 LD	300	struct property *prop;
e81c8f18 LD	301	const char *group;
31c89c95	302	const char *subnode_target_type = "pins";
e81c8f18	303
c7289500 BS	304	ret = of_property_count_strings(np, "pins");
	305	if (ret < 0) {
	306	ret = of_property_count_strings(np, "groups");
	307	if (ret < 0)
	308	/* skip this node; may contain config child nodes */
	309	return 0;
	310	if (type == PIN_MAP_TYPE_INVALID)
	311	type = PIN_MAP_TYPE_CONFIGS_GROUP;
	312	subnode_target_type = "groups";
	313	} else {
	314	if (type == PIN_MAP_TYPE_INVALID)
	315	type = PIN_MAP_TYPE_CONFIGS_PIN;
	316	}
	317	strings_count = ret;
	318
e81c8f18 LD	319	ret = of_property_read_string(np, "function", &function);
	320	if (ret < 0) {
	321	/* EINVAL=missing, which is fine since it's optional */
	322	if (ret != -EINVAL)
f5292d06 RH	323	dev_err(dev, "%pOF: could not parse property function\n",
f5292d06 RH	324	np);
e81c8f18 LD	325	function = NULL;
	326	}
	327
dd4d01f7 SB	328	ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
dd4d01f7 SB	329	&num_configs);
e81c8f18	330	if (ret < 0) {
f5292d06	331	dev_err(dev, "%pOF: could not parse node property\n", np);
e81c8f18 LD	332	return ret;
	333	}
	334
	335	reserve = 0;
	336	if (function != NULL)
	337	reserve++;
	338	if (num_configs)
	339	reserve++;
31c89c95	340
c7289500	341	reserve *= strings_count;
e81c8f18 LD	342
	343	ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
	344	num_maps, reserve);
	345	if (ret < 0)
	346	goto exit;
	347
31c89c95	348	of_property_for_each_string(np, subnode_target_type, prop, group) {
e81c8f18 LD	349	if (function) {
	350	ret = pinctrl_utils_add_map_mux(pctldev, map,
	351	reserved_maps, num_maps, group,
	352	function);
	353	if (ret < 0)
	354	goto exit;
	355	}
	356
	357	if (num_configs) {
	358	ret = pinctrl_utils_add_map_configs(pctldev, map,
	359	reserved_maps, num_maps, group, configs,
3287c240	360	num_configs, type);
e81c8f18 LD	361	if (ret < 0)
	362	goto exit;
	363	}
	364	}
	365	ret = 0;
	366
	367	exit:
	368	kfree(configs);
	369	return ret;
	370	}
	371	EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
	372
	373	int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
	374	struct device_node np_config, struct pinctrl_map *map,
3287c240	375	unsigned *num_maps, enum pinctrl_map_type type)
e81c8f18 LD	376	{
	377	unsigned reserved_maps;
	378	struct device_node *np;
	379	int ret;
	380
	381	reserved_maps = 0;
	382	*map = NULL;
	383	*num_maps = 0;
	384
c7289500 BS	385	ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
	386	&reserved_maps, num_maps, type);
	387	if (ret < 0)
	388	goto exit;
	389
e06c2ee5	390	for_each_available_child_of_node(np_config, np) {
e81c8f18	391	ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
3287c240	392	&reserved_maps, num_maps, type);
c7289500 BS	393	if (ret < 0)
c7289500 BS	394	goto exit;
e81c8f18 LD	395	}
e81c8f18 LD	396	return 0;
c7289500 BS	397
c7289500 BS	398	exit:
d32f7fd3	399	pinctrl_utils_free_map(pctldev, map, num_maps);
c7289500	400	return ret;
e81c8f18 LD	401	}
	402	EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
	403
8dfebf57 JH	404	void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev,
	405	struct pinctrl_map *map,
	406	unsigned num_maps)
	407	{
	408	pinctrl_utils_free_map(pctldev, map, num_maps);
	409	}
	410	EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map);
	411
7db9af4b	412	#endif