[linux-block.git] / drivers / regulator / fixed.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * fixed.c
 *
 * Copyright 2008 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * Copyright (c) 2009 Nokia Corporation
 * Roger Quadros <ext-roger.quadros@nokia.com>
 *
 * This is useful for systems with mixed controllable and
 * non-controllable regulators, as well as for allowing testing on
 * systems with no controllable regulators.
 */

#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_opp.h>
#include <linux/reboot.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/fixed.h>
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/machine.h>
#include <linux/clk.h>

/* Default time in millisecond to wait for emergency shutdown */
#define FV_DEF_EMERG_SHUTDWN_TMO	10

struct fixed_voltage_data {
	struct regulator_desc desc;
	struct regulator_dev *dev;

	struct clk *enable_clock;
	unsigned int enable_counter;
	int performance_state;
};

struct fixed_dev_type {
	bool has_enable_clock;
	bool has_performance_state;
};

static int reg_clock_enable(struct regulator_dev *rdev)
{
	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
	int ret = 0;

	ret = clk_prepare_enable(priv->enable_clock);
	if (ret)
		return ret;

	priv->enable_counter++;

	return ret;
}

static int reg_clock_disable(struct regulator_dev *rdev)
{
	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);

	clk_disable_unprepare(priv->enable_clock);
	priv->enable_counter--;

	return 0;
}

static int reg_domain_enable(struct regulator_dev *rdev)
{
	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
	struct device *dev = rdev->dev.parent;
	int ret;

	ret = dev_pm_genpd_set_performance_state(dev, priv->performance_state);
	if (ret)
		return ret;

	priv->enable_counter++;

	return ret;
}

static int reg_domain_disable(struct regulator_dev *rdev)
{
	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
	struct device *dev = rdev->dev.parent;
	int ret;

	ret = dev_pm_genpd_set_performance_state(dev, 0);
	if (ret)
		return ret;

	priv->enable_counter--;

	return 0;
}

static int reg_is_enabled(struct regulator_dev *rdev)
{
	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);

	return priv->enable_counter > 0;
}

static irqreturn_t reg_fixed_under_voltage_irq_handler(int irq, void *data)
{
	struct fixed_voltage_data *priv = data;
	struct regulator_dev *rdev = priv->dev;

	regulator_notifier_call_chain(rdev, REGULATOR_EVENT_UNDER_VOLTAGE,
				      NULL);

	return IRQ_HANDLED;
}

/**
 * reg_fixed_get_irqs - Get and register the optional IRQ for fixed voltage
 *                      regulator.
 * @dev: Pointer to the device structure.
 * @priv: Pointer to fixed_voltage_data structure containing private data.
 *
 * This function tries to get the IRQ from the device firmware node.
 * If it's an optional IRQ and not found, it returns 0.
 * Otherwise, it attempts to request the threaded IRQ.
 *
 * Return: 0 on success, or a negative error number on failure.
 */
static int reg_fixed_get_irqs(struct device *dev,
			      struct fixed_voltage_data *priv)
{
	int ret;

	ret = fwnode_irq_get(dev_fwnode(dev), 0);
	/* This is optional IRQ. If not found we will get -EINVAL */
	if (ret == -EINVAL)
		return 0;
	if (ret < 0)
		return dev_err_probe(dev, ret, "Failed to get IRQ\n");

	ret = devm_request_threaded_irq(dev, ret, NULL,
					reg_fixed_under_voltage_irq_handler,
					IRQF_ONESHOT, "under-voltage", priv);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to request IRQ\n");

	return 0;
}

/**
 * of_get_fixed_voltage_config - extract fixed_voltage_config structure info
 * @dev: device requesting for fixed_voltage_config
 * @desc: regulator description
 *
 * Populates fixed_voltage_config structure by extracting data from device
 * tree node.
 *
 * Return: Pointer to a populated &struct fixed_voltage_config or %NULL if
 *	   memory allocation fails.
 */
static struct fixed_voltage_config *
of_get_fixed_voltage_config(struct device *dev,
			    const struct regulator_desc *desc)
{
	struct fixed_voltage_config *config;
	struct device_node *np = dev->of_node;
	struct regulator_init_data *init_data;

	config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config),
								 GFP_KERNEL);
	if (!config)
		return ERR_PTR(-ENOMEM);

	config->init_data = of_get_regulator_init_data(dev, dev->of_node, desc);
	if (!config->init_data)
		return ERR_PTR(-EINVAL);

	init_data = config->init_data;
	init_data->constraints.apply_uV = 0;

	config->supply_name = init_data->constraints.name;
	if (init_data->constraints.min_uV == init_data->constraints.max_uV) {
		config->microvolts = init_data->constraints.min_uV;
	} else {
		dev_err(dev,
			 "Fixed regulator specified with variable voltages\n");
		return ERR_PTR(-EINVAL);
	}

	if (init_data->constraints.boot_on)
		config->enabled_at_boot = true;

	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
	of_property_read_u32(np, "off-on-delay-us", &config->off_on_delay);

	if (of_property_present(np, "vin-supply"))
		config->input_supply = "vin";

	return config;
}

static const struct regulator_ops fixed_voltage_ops = {
};

static const struct regulator_ops fixed_voltage_clkenabled_ops = {
	.enable = reg_clock_enable,
	.disable = reg_clock_disable,
	.is_enabled = reg_is_enabled,
};

static const struct regulator_ops fixed_voltage_domain_ops = {
	.enable = reg_domain_enable,
	.disable = reg_domain_disable,
	.is_enabled = reg_is_enabled,
};

static int reg_fixed_voltage_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct fixed_voltage_config *config;
	struct fixed_voltage_data *drvdata;
	const struct fixed_dev_type *drvtype = of_device_get_match_data(dev);
	struct regulator_config cfg = { };
	enum gpiod_flags gflags;
	int ret;

	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data),
			       GFP_KERNEL);
	if (!drvdata)
		return -ENOMEM;

	if (pdev->dev.of_node) {
		config = of_get_fixed_voltage_config(&pdev->dev,
						     &drvdata->desc);
		if (IS_ERR(config))
			return PTR_ERR(config);
	} else {
		config = dev_get_platdata(&pdev->dev);
	}

	if (!config)
		return -ENOMEM;

	drvdata->desc.name = devm_kstrdup(&pdev->dev,
					  config->supply_name,
					  GFP_KERNEL);
	if (drvdata->desc.name == NULL) {
		dev_err(&pdev->dev, "Failed to allocate supply name\n");
		return -ENOMEM;
	}
	drvdata->desc.type = REGULATOR_VOLTAGE;
	drvdata->desc.owner = THIS_MODULE;

	if (drvtype && drvtype->has_enable_clock) {
		drvdata->desc.ops = &fixed_voltage_clkenabled_ops;

		drvdata->enable_clock = devm_clk_get(dev, NULL);
		if (IS_ERR(drvdata->enable_clock)) {
			dev_err(dev, "Can't get enable-clock from devicetree\n");
			return PTR_ERR(drvdata->enable_clock);
		}
	} else if (drvtype && drvtype->has_performance_state) {
		drvdata->desc.ops = &fixed_voltage_domain_ops;

		drvdata->performance_state = of_get_required_opp_performance_state(dev->of_node, 0);
		if (drvdata->performance_state < 0) {
			dev_err(dev, "Can't get performance state from devicetree\n");
			return drvdata->performance_state;
		}
	} else {
		drvdata->desc.ops = &fixed_voltage_ops;
	}

	drvdata->desc.enable_time = config->startup_delay;
	drvdata->desc.off_on_delay = config->off_on_delay;

	if (config->input_supply) {
		drvdata->desc.supply_name = devm_kstrdup(&pdev->dev,
					    config->input_supply,
					    GFP_KERNEL);
		if (!drvdata->desc.supply_name)
			return -ENOMEM;
	}

	if (config->microvolts)
		drvdata->desc.n_voltages = 1;

	drvdata->desc.fixed_uV = config->microvolts;

	/*
	 * The signal will be inverted by the GPIO core if flagged so in the
	 * descriptor.
	 */
	if (config->enabled_at_boot)
		gflags = GPIOD_OUT_HIGH;
	else
		gflags = GPIOD_OUT_LOW;

	/*
	 * Some fixed regulators share the enable line between two
	 * regulators which makes it necessary to get a handle on the
	 * same descriptor for two different consumers. This will get
	 * the GPIO descriptor, but only the first call will initialize
	 * it so any flags such as inversion or open drain will only
	 * be set up by the first caller and assumed identical on the
	 * next caller.
	 *
	 * FIXME: find a better way to deal with this.
	 */
	gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE;

	/*
	 * Do not use devm* here: the regulator core takes over the
	 * lifecycle management of the GPIO descriptor.
	 */
	cfg.ena_gpiod = gpiod_get_optional(&pdev->dev, NULL, gflags);
	if (IS_ERR(cfg.ena_gpiod))
		return dev_err_probe(&pdev->dev, PTR_ERR(cfg.ena_gpiod),
				     "can't get GPIO\n");

	cfg.dev = &pdev->dev;
	cfg.init_data = config->init_data;
	cfg.driver_data = drvdata;
	cfg.of_node = pdev->dev.of_node;

	drvdata->dev = devm_regulator_register(&pdev->dev, &drvdata->desc,
					       &cfg);
	if (IS_ERR(drvdata->dev)) {
		ret = dev_err_probe(&pdev->dev, PTR_ERR(drvdata->dev),
				    "Failed to register regulator: %ld\n",
				    PTR_ERR(drvdata->dev));
		return ret;
	}

	platform_set_drvdata(pdev, drvdata);

	dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
		drvdata->desc.fixed_uV);

	ret = reg_fixed_get_irqs(dev, drvdata);
	if (ret)
		return ret;

	return 0;
}

#if defined(CONFIG_OF)
static const struct fixed_dev_type fixed_voltage_data = {
	.has_enable_clock = false,
};

static const struct fixed_dev_type fixed_clkenable_data = {
	.has_enable_clock = true,
};

static const struct fixed_dev_type fixed_domain_data = {
	.has_performance_state = true,
};

static const struct of_device_id fixed_of_match[] = {
	{
		.compatible = "regulator-fixed",
		.data = &fixed_voltage_data,
	},
	{
		.compatible = "regulator-fixed-clock",
		.data = &fixed_clkenable_data,
	},
	{
		.compatible = "regulator-fixed-domain",
		.data = &fixed_domain_data,
	},
	{
	},
};
MODULE_DEVICE_TABLE(of, fixed_of_match);
#endif

static struct platform_driver regulator_fixed_voltage_driver = {
	.probe		= reg_fixed_voltage_probe,
	.driver		= {
		.name		= "reg-fixed-voltage",
		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
		.of_match_table = of_match_ptr(fixed_of_match),
	},
};

static int __init regulator_fixed_voltage_init(void)
{
	return platform_driver_register(&regulator_fixed_voltage_driver);
}
subsys_initcall(regulator_fixed_voltage_init);

static void __exit regulator_fixed_voltage_exit(void)
{
	platform_driver_unregister(&regulator_fixed_voltage_driver);
}
module_exit(regulator_fixed_voltage_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("Fixed voltage regulator");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:reg-fixed-voltage");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
4b74ff65 MB	2	/*
	3	* fixed.c
	4	*
	5	* Copyright 2008 Wolfson Microelectronics PLC.
	6	*
	7	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	8	*
86d9884b RQ	9	* Copyright (c) 2009 Nokia Corporation
	10	* Roger Quadros <ext-roger.quadros@nokia.com>
	11	*
4b74ff65 MB	12	* This is useful for systems with mixed controllable and
	13	* non-controllable regulators, as well as for allowing testing on
	14	* systems with no controllable regulators.
	15	*/
	16
	17	#include <linux/err.h>
	18	#include <linux/mutex.h>
65602c32	19	#include <linux/module.h>
4b74ff65	20	#include <linux/platform_device.h>
bf3a28cf DB	21	#include <linux/pm_domain.h>
bf3a28cf DB	22	#include <linux/pm_opp.h>
ecb6f1f4	23	#include <linux/reboot.h>
4b74ff65 MB	24	#include <linux/regulator/driver.h>
4b74ff65 MB	25	#include <linux/regulator/fixed.h>
efdfeb07	26	#include <linux/gpio/consumer.h>
5a0e3ad6	27	#include <linux/slab.h>
cef49102	28	#include <linux/of.h>
cef49102 RN	29	#include <linux/regulator/of_regulator.h>
cef49102 RN	30	#include <linux/regulator/machine.h>
8959e532 PS	31	#include <linux/clk.h>
8959e532 PS	32
ecb6f1f4 OR	33	/* Default time in millisecond to wait for emergency shutdown */
ecb6f1f4 OR	34	#define FV_DEF_EMERG_SHUTDWN_TMO 10
4b74ff65 MB	35
	36	struct fixed_voltage_data {
	37	struct regulator_desc desc;
	38	struct regulator_dev *dev;
8959e532 PS	39
8959e532 PS	40	struct clk *enable_clock;
bf3a28cf DB	41	unsigned int enable_counter;
bf3a28cf DB	42	int performance_state;
4b74ff65 MB	43	};
4b74ff65 MB	44
8959e532 PS	45	struct fixed_dev_type {
8959e532 PS	46	bool has_enable_clock;
bf3a28cf	47	bool has_performance_state;
8959e532 PS	48	};
8959e532 PS	49
8959e532 PS	50	static int reg_clock_enable(struct regulator_dev *rdev)
	51	{
	52	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
	53	int ret = 0;
	54
	55	ret = clk_prepare_enable(priv->enable_clock);
	56	if (ret)
	57	return ret;
	58
bf3a28cf	59	priv->enable_counter++;
8959e532 PS	60
	61	return ret;
	62	}
	63
	64	static int reg_clock_disable(struct regulator_dev *rdev)
	65	{
	66	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
	67
	68	clk_disable_unprepare(priv->enable_clock);
bf3a28cf	69	priv->enable_counter--;
8959e532 PS	70
	71	return 0;
	72	}
	73
bf3a28cf	74	static int reg_domain_enable(struct regulator_dev *rdev)
8959e532 PS	75	{
8959e532 PS	76	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
bf3a28cf DB	77	struct device *dev = rdev->dev.parent;
	78	int ret;
	79
	80	ret = dev_pm_genpd_set_performance_state(dev, priv->performance_state);
	81	if (ret)
	82	return ret;
8959e532	83
bf3a28cf DB	84	priv->enable_counter++;
	85
	86	return ret;
	87	}
	88
	89	static int reg_domain_disable(struct regulator_dev *rdev)
	90	{
	91	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
	92	struct device *dev = rdev->dev.parent;
855bfff9 AL	93	int ret;
	94
	95	ret = dev_pm_genpd_set_performance_state(dev, 0);
	96	if (ret)
	97	return ret;
bf3a28cf DB	98
	99	priv->enable_counter--;
	100
855bfff9	101	return 0;
bf3a28cf DB	102	}
	103
	104	static int reg_is_enabled(struct regulator_dev *rdev)
	105	{
	106	struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
	107
	108	return priv->enable_counter > 0;
8959e532 PS	109	}
8959e532 PS	110
ecb6f1f4 OR	111	static irqreturn_t reg_fixed_under_voltage_irq_handler(int irq, void *data)
	112	{
	113	struct fixed_voltage_data *priv = data;
	114	struct regulator_dev *rdev = priv->dev;
	115
	116	regulator_notifier_call_chain(rdev, REGULATOR_EVENT_UNDER_VOLTAGE,
	117	NULL);
	118
	119	return IRQ_HANDLED;
	120	}
	121
	122	/**
	123	* reg_fixed_get_irqs - Get and register the optional IRQ for fixed voltage
	124	* regulator.
	125	* @dev: Pointer to the device structure.
	126	* @priv: Pointer to fixed_voltage_data structure containing private data.
	127	*
	128	* This function tries to get the IRQ from the device firmware node.
	129	* If it's an optional IRQ and not found, it returns 0.
	130	* Otherwise, it attempts to request the threaded IRQ.
	131	*
98ce82a5	132	* Return: 0 on success, or a negative error number on failure.
ecb6f1f4 OR	133	*/
	134	static int reg_fixed_get_irqs(struct device *dev,
	135	struct fixed_voltage_data *priv)
	136	{
	137	int ret;
	138
	139	ret = fwnode_irq_get(dev_fwnode(dev), 0);
	140	/* This is optional IRQ. If not found we will get -EINVAL */
	141	if (ret == -EINVAL)
	142	return 0;
	143	if (ret < 0)
	144	return dev_err_probe(dev, ret, "Failed to get IRQ\n");
	145
	146	ret = devm_request_threaded_irq(dev, ret, NULL,
	147	reg_fixed_under_voltage_irq_handler,
	148	IRQF_ONESHOT, "under-voltage", priv);
	149	if (ret)
	150	return dev_err_probe(dev, ret, "Failed to request IRQ\n");
	151
	152	return 0;
	153	}
cef49102 RN	154
	155	/**
	156	* of_get_fixed_voltage_config - extract fixed_voltage_config structure info
	157	* @dev: device requesting for fixed_voltage_config
072e78b1	158	* @desc: regulator description
cef49102 RN	159	*
cef49102 RN	160	* Populates fixed_voltage_config structure by extracting data from device
5f93c59e CYT	161	* tree node.
	162	*
	163	* Return: Pointer to a populated &struct fixed_voltage_config or %NULL if
	164	* memory allocation fails.
cef49102	165	*/
bc91396b	166	static struct fixed_voltage_config *
072e78b1 JMC	167	of_get_fixed_voltage_config(struct device *dev,
072e78b1 JMC	168	const struct regulator_desc *desc)
cef49102 RN	169	{
	170	struct fixed_voltage_config *config;
	171	struct device_node *np = dev->of_node;
cef49102 RN	172	struct regulator_init_data *init_data;
	173
	174	config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config),
	175	GFP_KERNEL);
	176	if (!config)
f141822b	177	return ERR_PTR(-ENOMEM);
cef49102	178
072e78b1	179	config->init_data = of_get_regulator_init_data(dev, dev->of_node, desc);
4b864af1	180	if (!config->init_data)
f141822b	181	return ERR_PTR(-EINVAL);
4b864af1	182
cef49102	183	init_data = config->init_data;
0c437c4a	184	init_data->constraints.apply_uV = 0;
cef49102 RN	185
	186	config->supply_name = init_data->constraints.name;
	187	if (init_data->constraints.min_uV == init_data->constraints.max_uV) {
	188	config->microvolts = init_data->constraints.min_uV;
	189	} else {
	190	dev_err(dev,
	191	"Fixed regulator specified with variable voltages\n");
f141822b	192	return ERR_PTR(-EINVAL);
cef49102 RN	193	}
	194
	195	if (init_data->constraints.boot_on)
	196	config->enabled_at_boot = true;
	197
4127f696	198	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
f7907e57	199	of_property_read_u32(np, "off-on-delay-us", &config->off_on_delay);
cef49102	200
7dda20c9	201	if (of_property_present(np, "vin-supply"))
6be5bfc3 LD	202	config->input_supply = "vin";
6be5bfc3 LD	203
cef49102 RN	204	return config;
	205	}
	206
96ee75ff	207	static const struct regulator_ops fixed_voltage_ops = {
9d442061 MB	208	};
9d442061 MB	209
96ee75ff	210	static const struct regulator_ops fixed_voltage_clkenabled_ops = {
8959e532 PS	211	.enable = reg_clock_enable,
8959e532 PS	212	.disable = reg_clock_disable,
bf3a28cf DB	213	.is_enabled = reg_is_enabled,
	214	};
	215
	216	static const struct regulator_ops fixed_voltage_domain_ops = {
	217	.enable = reg_domain_enable,
	218	.disable = reg_domain_disable,
	219	.is_enabled = reg_is_enabled,
8959e532 PS	220	};
8959e532 PS	221
a5023574	222	static int reg_fixed_voltage_probe(struct platform_device *pdev)
4b74ff65	223	{
8959e532	224	struct device *dev = &pdev->dev;
22d881c0	225	struct fixed_voltage_config *config;
4b74ff65	226	struct fixed_voltage_data *drvdata;
1d6db22f	227	const struct fixed_dev_type *drvtype = of_device_get_match_data(dev);
c172708d	228	struct regulator_config cfg = { };
efdfeb07	229	enum gpiod_flags gflags;
4b74ff65 MB	230	int ret;
4b74ff65 MB	231
072e78b1 JMC	232	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data),
	233	GFP_KERNEL);
	234	if (!drvdata)
	235	return -ENOMEM;
	236
f141822b	237	if (pdev->dev.of_node) {
072e78b1 JMC	238	config = of_get_fixed_voltage_config(&pdev->dev,
072e78b1 JMC	239	&drvdata->desc);
f141822b SW	240	if (IS_ERR(config))
	241	return PTR_ERR(config);
	242	} else {
dff91d0b	243	config = dev_get_platdata(&pdev->dev);
f141822b	244	}
22d881c0 AL	245
	246	if (!config)
	247	return -ENOMEM;
cef49102	248
84d0ffbe MB	249	drvdata->desc.name = devm_kstrdup(&pdev->dev,
	250	config->supply_name,
	251	GFP_KERNEL);
4b74ff65	252	if (drvdata->desc.name == NULL) {
c53ad7fe	253	dev_err(&pdev->dev, "Failed to allocate supply name\n");
84d0ffbe	254	return -ENOMEM;
4b74ff65 MB	255	}
	256	drvdata->desc.type = REGULATOR_VOLTAGE;
	257	drvdata->desc.owner = THIS_MODULE;
8959e532	258
1d6db22f	259	if (drvtype && drvtype->has_enable_clock) {
8959e532 PS	260	drvdata->desc.ops = &fixed_voltage_clkenabled_ops;
	261
	262	drvdata->enable_clock = devm_clk_get(dev, NULL);
	263	if (IS_ERR(drvdata->enable_clock)) {
09dad81e	264	dev_err(dev, "Can't get enable-clock from devicetree\n");
02bcba0b	265	return PTR_ERR(drvdata->enable_clock);
8959e532	266	}
bf3a28cf DB	267	} else if (drvtype && drvtype->has_performance_state) {
	268	drvdata->desc.ops = &fixed_voltage_domain_ops;
	269
	270	drvdata->performance_state = of_get_required_opp_performance_state(dev->of_node, 0);
	271	if (drvdata->performance_state < 0) {
	272	dev_err(dev, "Can't get performance state from devicetree\n");
	273	return drvdata->performance_state;
	274	}
8959e532 PS	275	} else {
	276	drvdata->desc.ops = &fixed_voltage_ops;
	277	}
1c37f8a8	278
3d0f267f	279	drvdata->desc.enable_time = config->startup_delay;
f7907e57	280	drvdata->desc.off_on_delay = config->off_on_delay;
3d0f267f	281
6be5bfc3	282	if (config->input_supply) {
84d0ffbe MB	283	drvdata->desc.supply_name = devm_kstrdup(&pdev->dev,
	284	config->input_supply,
	285	GFP_KERNEL);
6c315afe	286	if (!drvdata->desc.supply_name)
84d0ffbe	287	return -ENOMEM;
6be5bfc3 LD	288	}
6be5bfc3 LD	289
1c37f8a8 SH	290	if (config->microvolts)
1c37f8a8 SH	291	drvdata->desc.n_voltages = 1;
4b74ff65	292
c368e5fc	293	drvdata->desc.fixed_uV = config->microvolts;
9d442061	294
01dc79cd LW	295	/*
01dc79cd LW	296	* The signal will be inverted by the GPIO core if flagged so in the
d3f37233	297	* descriptor.
01dc79cd LW	298	*/
	299	if (config->enabled_at_boot)
	300	gflags = GPIOD_OUT_HIGH;
	301	else
	302	gflags = GPIOD_OUT_LOW;
efdfeb07	303
b0ce7b29 LW	304	/*
	305	* Some fixed regulators share the enable line between two
	306	* regulators which makes it necessary to get a handle on the
	307	* same descriptor for two different consumers. This will get
	308	* the GPIO descriptor, but only the first call will initialize
	309	* it so any flags such as inversion or open drain will only
	310	* be set up by the first caller and assumed identical on the
	311	* next caller.
	312	*
	313	* FIXME: find a better way to deal with this.
	314	*/
	315	gflags \|= GPIOD_FLAGS_BIT_NONEXCLUSIVE;
	316
5e6f3ae5 LW	317	/*
	318	* Do not use devm* here: the regulator core takes over the
	319	* lifecycle management of the GPIO descriptor.
	320	*/
	321	cfg.ena_gpiod = gpiod_get_optional(&pdev->dev, NULL, gflags);
efdfeb07	322	if (IS_ERR(cfg.ena_gpiod))
7740ab84 RC	323	return dev_err_probe(&pdev->dev, PTR_ERR(cfg.ena_gpiod),
7740ab84 RC	324	"can't get GPIO\n");
4b74ff65	325
c172708d MB	326	cfg.dev = &pdev->dev;
	327	cfg.init_data = config->init_data;
	328	cfg.driver_data = drvdata;
	329	cfg.of_node = pdev->dev.of_node;
	330
84d0ffbe MB	331	drvdata->dev = devm_regulator_register(&pdev->dev, &drvdata->desc,
84d0ffbe MB	332	&cfg);
4b74ff65	333	if (IS_ERR(drvdata->dev)) {
d0f95e64 CM	334	ret = dev_err_probe(&pdev->dev, PTR_ERR(drvdata->dev),
	335	"Failed to register regulator: %ld\n",
	336	PTR_ERR(drvdata->dev));
84d0ffbe	337	return ret;
4b74ff65 MB	338	}
	339
	340	platform_set_drvdata(pdev, drvdata);
	341
	342	dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
c368e5fc	343	drvdata->desc.fixed_uV);
4b74ff65	344
ecb6f1f4 OR	345	ret = reg_fixed_get_irqs(dev, drvdata);
	346	if (ret)
	347	return ret;
	348
4b74ff65	349	return 0;
4b74ff65 MB	350	}
4b74ff65 MB	351
cef49102	352	#if defined(CONFIG_OF)
0f037255 JZ	353	static const struct fixed_dev_type fixed_voltage_data = {
	354	.has_enable_clock = false,
	355	};
	356
	357	static const struct fixed_dev_type fixed_clkenable_data = {
	358	.has_enable_clock = true,
	359	};
	360
bf3a28cf DB	361	static const struct fixed_dev_type fixed_domain_data = {
	362	.has_performance_state = true,
	363	};
	364
3d68dfe3	365	static const struct of_device_id fixed_of_match[] = {
8959e532 PS	366	{
	367	.compatible = "regulator-fixed",
	368	.data = &fixed_voltage_data,
	369	},
	370	{
	371	.compatible = "regulator-fixed-clock",
	372	.data = &fixed_clkenable_data,
	373	},
bf3a28cf DB	374	{
	375	.compatible = "regulator-fixed-domain",
	376	.data = &fixed_domain_data,
	377	},
8959e532 PS	378	{
8959e532 PS	379	},
cef49102 RN	380	};
cef49102 RN	381	MODULE_DEVICE_TABLE(of, fixed_of_match);
cef49102 RN	382	#endif
cef49102 RN	383
4b74ff65	384	static struct platform_driver regulator_fixed_voltage_driver = {
8ab3343d	385	.probe = reg_fixed_voltage_probe,
4b74ff65 MB	386	.driver = {
4b74ff65 MB	387	.name = "reg-fixed-voltage",
259b93b2	388	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
abcfaf23	389	.of_match_table = of_match_ptr(fixed_of_match),
4b74ff65 MB	390	},
	391	};
	392
	393	static int __init regulator_fixed_voltage_init(void)
	394	{
	395	return platform_driver_register(&regulator_fixed_voltage_driver);
	396	}
5a1b22be	397	subsys_initcall(regulator_fixed_voltage_init);
4b74ff65 MB	398
	399	static void __exit regulator_fixed_voltage_exit(void)
	400	{
	401	platform_driver_unregister(&regulator_fixed_voltage_driver);
	402	}
	403	module_exit(regulator_fixed_voltage_exit);
	404
	405	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	406	MODULE_DESCRIPTION("Fixed voltage regulator");
	407	MODULE_LICENSE("GPL");
38c53c89	408	MODULE_ALIAS("platform:reg-fixed-voltage");