[linux-2.6-block.git] / drivers / regulator / tps65090-regulator.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Regulator driver for tps65090 power management chip.
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.

 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/tps65090.h>

#define MAX_CTRL_READ_TRIES	5
#define MAX_FET_ENABLE_TRIES	1000

#define CTRL_EN_BIT		0 /* Regulator enable bit, active high */
#define CTRL_WT_BIT		2 /* Regulator wait time 0 bit */
#define CTRL_PG_BIT		4 /* Regulator power good bit, 1=good */
#define CTRL_TO_BIT		7 /* Regulator timeout bit, 1=wait */

#define MAX_OVERCURRENT_WAIT	3 /* Overcurrent wait must be <= this */

/**
 * struct tps65090_regulator - Per-regulator data for a tps65090 regulator
 *
 * @dev: Pointer to our device.
 * @desc: The struct regulator_desc for the regulator.
 * @rdev: The struct regulator_dev for the regulator.
 * @overcurrent_wait_valid: True if overcurrent_wait is valid.
 * @overcurrent_wait: For FETs, the value to put in the WTFET bitfield.
 */

struct tps65090_regulator {
	struct device		*dev;
	struct regulator_desc	*desc;
	struct regulator_dev	*rdev;
	bool			overcurrent_wait_valid;
	int			overcurrent_wait;
};

static struct regulator_ops tps65090_ext_control_ops = {
};

/**
 * tps65090_reg_set_overcurrent_wait - Setup overcurrent wait
 *
 * This will set the overcurrent wait time based on what's in the regulator
 * info.
 *
 * @ri:		Overall regulator data
 * @rdev:	Regulator device
 *
 * Return: 0 if no error, non-zero if there was an error writing the register.
 */
static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri,
					     struct regulator_dev *rdev)
{
	int ret;

	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				 MAX_OVERCURRENT_WAIT << CTRL_WT_BIT,
				 ri->overcurrent_wait << CTRL_WT_BIT);
	if (ret) {
		dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n",
			rdev->desc->enable_reg);
	}

	return ret;
}

/**
 * tps65090_try_enable_fet - Try to enable a FET
 *
 * @rdev:	Regulator device
 *
 * Return: 0 if ok, -ENOTRECOVERABLE if the FET power good bit did not get
 * set, or some other -ve value if another error occurred (e.g. i2c error)
 */
static int tps65090_try_enable_fet(struct regulator_dev *rdev)
{
	unsigned int control;
	int ret, i;

	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				 rdev->desc->enable_mask,
				 rdev->desc->enable_mask);
	if (ret < 0) {
		dev_err(&rdev->dev, "Error in updating reg %#x\n",
			rdev->desc->enable_reg);
		return ret;
	}

	for (i = 0; i < MAX_CTRL_READ_TRIES; i++) {
		ret = regmap_read(rdev->regmap, rdev->desc->enable_reg,
				  &control);
		if (ret < 0)
			return ret;

		if (!(control & BIT(CTRL_TO_BIT)))
			break;

		usleep_range(1000, 1500);
	}
	if (!(control & BIT(CTRL_PG_BIT)))
		return -ENOTRECOVERABLE;

	return 0;
}

/**
 * tps65090_fet_enable - Enable a FET, trying a few times if it fails
 *
 * Some versions of the tps65090 have issues when turning on the FETs.
 * This function goes through several steps to ensure the best chance of the
 * FET going on.  Specifically:
 * - We'll make sure that we bump the "overcurrent wait" to the maximum, which
 *   increases the chances that we'll turn on properly.
 * - We'll retry turning the FET on multiple times (turning off in between).
 *
 * @rdev:	Regulator device
 *
 * Return: 0 if ok, non-zero if it fails.
 */
static int tps65090_fet_enable(struct regulator_dev *rdev)
{
	int ret, tries;

	/*
	 * Try enabling multiple times until we succeed since sometimes the
	 * first try times out.
	 */
	tries = 0;
	while (true) {
		ret = tps65090_try_enable_fet(rdev);
		if (!ret)
			break;
		if (ret != -ENOTRECOVERABLE || tries == MAX_FET_ENABLE_TRIES)
			goto err;

		/* Try turning the FET off (and then on again) */
		ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
					 rdev->desc->enable_mask, 0);
		if (ret)
			goto err;

		tries++;
	}

	if (tries)
		dev_warn(&rdev->dev, "reg %#x enable ok after %d tries\n",
			 rdev->desc->enable_reg, tries);

	return 0;
err:
	dev_warn(&rdev->dev, "reg %#x enable failed\n", rdev->desc->enable_reg);
	WARN_ON(1);

	return ret;
}

static struct regulator_ops tps65090_reg_control_ops = {
	.enable		= regulator_enable_regmap,
	.disable	= regulator_disable_regmap,
	.is_enabled	= regulator_is_enabled_regmap,
};

static struct regulator_ops tps65090_fet_control_ops = {
	.enable		= tps65090_fet_enable,
	.disable	= regulator_disable_regmap,
	.is_enabled	= regulator_is_enabled_regmap,
};

static struct regulator_ops tps65090_ldo_ops = {
};

#define tps65090_REG_DESC(_id, _sname, _en_reg, _en_bits, _nvolt, _volt, _ops) \
{							\
	.name = "TPS65090_RAILS"#_id,			\
	.supply_name = _sname,				\
	.id = TPS65090_REGULATOR_##_id,			\
	.n_voltages = _nvolt,				\
	.ops = &_ops,					\
	.fixed_uV = _volt,				\
	.enable_reg = _en_reg,				\
	.enable_val = _en_bits,				\
	.enable_mask = _en_bits,			\
	.type = REGULATOR_VOLTAGE,			\
	.owner = THIS_MODULE,				\
}

#define tps65090_REG_FIXEDV(_id, _sname, en_reg, _en_bits, _volt, _ops) \
	tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 1, _volt, _ops)

#define tps65090_REG_SWITCH(_id, _sname, en_reg, _en_bits, _ops) \
	tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 0, 0, _ops)

static struct regulator_desc tps65090_regulator_desc[] = {
	tps65090_REG_FIXEDV(DCDC1, "vsys1",   0x0C, BIT(CTRL_EN_BIT), 5000000,
			    tps65090_reg_control_ops),
	tps65090_REG_FIXEDV(DCDC2, "vsys2",   0x0D, BIT(CTRL_EN_BIT), 3300000,
			    tps65090_reg_control_ops),
	tps65090_REG_SWITCH(DCDC3, "vsys3",   0x0E, BIT(CTRL_EN_BIT),
			    tps65090_reg_control_ops),

	tps65090_REG_SWITCH(FET1,  "infet1",  0x0F,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET2,  "infet2",  0x10,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET3,  "infet3",  0x11,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET4,  "infet4",  0x12,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET5,  "infet5",  0x13,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET6,  "infet6",  0x14,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET7,  "infet7",  0x15,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),

	tps65090_REG_FIXEDV(LDO1,  "vsys-l1", 0, 0, 5000000,
			    tps65090_ldo_ops),
	tps65090_REG_FIXEDV(LDO2,  "vsys-l2", 0, 0, 3300000,
			    tps65090_ldo_ops),
};

static inline bool is_dcdc(int id)
{
	switch (id) {
	case TPS65090_REGULATOR_DCDC1:
	case TPS65090_REGULATOR_DCDC2:
	case TPS65090_REGULATOR_DCDC3:
		return true;
	default:
		return false;
	}
}

static int tps65090_config_ext_control(
	struct tps65090_regulator *ri, bool enable)
{
	int ret;
	struct device *parent = ri->dev->parent;
	unsigned int reg_en_reg = ri->desc->enable_reg;

	if (enable)
		ret = tps65090_set_bits(parent, reg_en_reg, 1);
	else
		ret =  tps65090_clr_bits(parent, reg_en_reg, 1);
	if (ret < 0)
		dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
	return ret;
}

static int tps65090_regulator_disable_ext_control(
		struct tps65090_regulator *ri,
		struct tps65090_regulator_plat_data *tps_pdata)
{
	int ret = 0;
	struct device *parent = ri->dev->parent;
	unsigned int reg_en_reg = ri->desc->enable_reg;

	/*
	 * First enable output for internal control if require.
	 * And then disable external control.
	 */
	if (tps_pdata->reg_init_data->constraints.always_on ||
			tps_pdata->reg_init_data->constraints.boot_on) {
		ret =  tps65090_set_bits(parent, reg_en_reg, 0);
		if (ret < 0) {
			dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
			return ret;
		}
	}
	return tps65090_config_ext_control(ri, false);
}

#ifdef CONFIG_OF
static struct of_regulator_match tps65090_matches[] = {
	{ .name = "dcdc1", },
	{ .name = "dcdc2", },
	{ .name = "dcdc3", },
	{ .name = "fet1",  },
	{ .name = "fet2",  },
	{ .name = "fet3",  },
	{ .name = "fet4",  },
	{ .name = "fet5",  },
	{ .name = "fet6",  },
	{ .name = "fet7",  },
	{ .name = "ldo1",  },
	{ .name = "ldo2",  },
};

static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
		struct platform_device *pdev,
		struct of_regulator_match **tps65090_reg_matches)
{
	struct tps65090_platform_data *tps65090_pdata;
	struct device_node *np = pdev->dev.parent->of_node;
	struct device_node *regulators;
	int idx = 0, ret;
	struct tps65090_regulator_plat_data *reg_pdata;

	tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata),
				GFP_KERNEL);
	if (!tps65090_pdata)
		return ERR_PTR(-ENOMEM);

	reg_pdata = devm_kcalloc(&pdev->dev,
				 TPS65090_REGULATOR_MAX, sizeof(*reg_pdata),
				 GFP_KERNEL);
	if (!reg_pdata)
		return ERR_PTR(-ENOMEM);

	regulators = of_get_child_by_name(np, "regulators");
	if (!regulators) {
		dev_err(&pdev->dev, "regulator node not found\n");
		return ERR_PTR(-ENODEV);
	}

	ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches,
			ARRAY_SIZE(tps65090_matches));
	of_node_put(regulators);
	if (ret < 0) {
		dev_err(&pdev->dev,
			"Error parsing regulator init data: %d\n", ret);
		return ERR_PTR(ret);
	}

	*tps65090_reg_matches = tps65090_matches;
	for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) {
		struct regulator_init_data *ri_data;
		struct tps65090_regulator_plat_data *rpdata;

		rpdata = &reg_pdata[idx];
		ri_data = tps65090_matches[idx].init_data;
		if (!ri_data || !tps65090_matches[idx].of_node)
			continue;

		rpdata->reg_init_data = ri_data;
		rpdata->enable_ext_control = of_property_read_bool(
					tps65090_matches[idx].of_node,
					"ti,enable-ext-control");
		if (rpdata->enable_ext_control) {
			enum gpiod_flags gflags;

			if (ri_data->constraints.always_on ||
			    ri_data->constraints.boot_on)
				gflags = GPIOD_OUT_HIGH;
			else
				gflags = GPIOD_OUT_LOW;
			gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE;

			rpdata->gpiod = devm_gpiod_get_from_of_node(&pdev->dev,
								    tps65090_matches[idx].of_node,
								    "dcdc-ext-control-gpios", 0,
								    gflags,
								    "tps65090");
			if (PTR_ERR(rpdata->gpiod) == -ENOENT) {
				dev_err(&pdev->dev,
					"could not find DCDC external control GPIO\n");
				rpdata->gpiod = NULL;
			} else if (IS_ERR(rpdata->gpiod))
				return ERR_CAST(rpdata->gpiod);
		}

		if (of_property_read_u32(tps65090_matches[idx].of_node,
					 "ti,overcurrent-wait",
					 &rpdata->overcurrent_wait) == 0)
			rpdata->overcurrent_wait_valid = true;

		tps65090_pdata->reg_pdata[idx] = rpdata;
	}
	return tps65090_pdata;
}
#else
static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data(
			struct platform_device *pdev,
			struct of_regulator_match **tps65090_reg_matches)
{
	*tps65090_reg_matches = NULL;
	return NULL;
}
#endif

static int tps65090_regulator_probe(struct platform_device *pdev)
{
	struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
	struct tps65090_regulator *ri = NULL;
	struct regulator_config config = { };
	struct regulator_dev *rdev;
	struct tps65090_regulator_plat_data *tps_pdata;
	struct tps65090_regulator *pmic;
	struct tps65090_platform_data *tps65090_pdata;
	struct of_regulator_match *tps65090_reg_matches = NULL;
	int num;
	int ret;

	dev_dbg(&pdev->dev, "Probing regulator\n");

	tps65090_pdata = dev_get_platdata(pdev->dev.parent);
	if (!tps65090_pdata && tps65090_mfd->dev->of_node)
		tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
					&tps65090_reg_matches);
	if (IS_ERR_OR_NULL(tps65090_pdata)) {
		dev_err(&pdev->dev, "Platform data missing\n");
		return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
	}

	pmic = devm_kcalloc(&pdev->dev,
			    TPS65090_REGULATOR_MAX, sizeof(*pmic),
			    GFP_KERNEL);
	if (!pmic)
		return -ENOMEM;

	for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
		tps_pdata = tps65090_pdata->reg_pdata[num];

		ri = &pmic[num];
		ri->dev = &pdev->dev;
		ri->desc = &tps65090_regulator_desc[num];
		if (tps_pdata) {
			ri->overcurrent_wait_valid =
				tps_pdata->overcurrent_wait_valid;
			ri->overcurrent_wait = tps_pdata->overcurrent_wait;
		}

		/*
		 * TPS5090 DCDC support the control from external digital input.
		 * Configure it as per platform data.
		 */
		if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
			if (tps_pdata->enable_ext_control) {
				config.ena_gpiod = tps_pdata->gpiod;
				ri->desc->ops = &tps65090_ext_control_ops;
			} else {
				ret = tps65090_regulator_disable_ext_control(
						ri, tps_pdata);
				if (ret < 0) {
					dev_err(&pdev->dev,
						"failed disable ext control\n");
					return ret;
				}
			}
		}

		config.dev = pdev->dev.parent;
		config.driver_data = ri;
		config.regmap = tps65090_mfd->rmap;
		if (tps_pdata)
			config.init_data = tps_pdata->reg_init_data;
		else
			config.init_data = NULL;
		if (tps65090_reg_matches)
			config.of_node = tps65090_reg_matches[num].of_node;
		else
			config.of_node = NULL;

		/*
		 * Hand the GPIO descriptor management over to the regulator
		 * core, remove it from devres management.
		 */
		if (config.ena_gpiod)
			devm_gpiod_unhinge(&pdev->dev, config.ena_gpiod);
		rdev = devm_regulator_register(&pdev->dev, ri->desc, &config);
		if (IS_ERR(rdev)) {
			dev_err(&pdev->dev, "failed to register regulator %s\n",
				ri->desc->name);
			return PTR_ERR(rdev);
		}
		ri->rdev = rdev;

		if (ri->overcurrent_wait_valid) {
			ret = tps65090_reg_set_overcurrent_wait(ri, rdev);
			if (ret < 0)
				return ret;
		}

		/* Enable external control if it is require */
		if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
				tps_pdata->enable_ext_control) {
			ret = tps65090_config_ext_control(ri, true);
			if (ret < 0)
				return ret;
		}
	}

	platform_set_drvdata(pdev, pmic);
	return 0;
}

static struct platform_driver tps65090_regulator_driver = {
	.driver	= {
		.name	= "tps65090-pmic",
	},
	.probe		= tps65090_regulator_probe,
};

static int __init tps65090_regulator_init(void)
{
	return platform_driver_register(&tps65090_regulator_driver);
}
subsys_initcall(tps65090_regulator_init);

static void __exit tps65090_regulator_exit(void)
{
	platform_driver_unregister(&tps65090_regulator_driver);
}
module_exit(tps65090_regulator_exit);

MODULE_DESCRIPTION("tps65090 regulator driver");
MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps65090-pmic");
Commit	Line	Data
9952f691	1	// SPDX-License-Identifier: GPL-2.0-only
452534e5 VB	2	/*
	3	* Regulator driver for tps65090 power management chip.
	4	*
	5	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	6
452534e5 VB	7	*/
	8
	9	#include <linux/module.h>
ed11f1ea	10	#include <linux/delay.h>
452534e5	11	#include <linux/init.h>
3012e814 LW	12	#include <linux/of.h>
3012e814 LW	13	#include <linux/gpio/consumer.h>
452534e5 VB	14	#include <linux/slab.h>
	15	#include <linux/err.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/regulator/driver.h>
	18	#include <linux/regulator/machine.h>
6c7a7a0e	19	#include <linux/regulator/of_regulator.h>
452534e5	20	#include <linux/mfd/tps65090.h>
452534e5	21
ed11f1ea DA	22	#define MAX_CTRL_READ_TRIES 5
	23	#define MAX_FET_ENABLE_TRIES 1000
	24
	25	#define CTRL_EN_BIT 0 /* Regulator enable bit, active high */
29041449	26	#define CTRL_WT_BIT 2 /* Regulator wait time 0 bit */
ed11f1ea DA	27	#define CTRL_PG_BIT 4 /* Regulator power good bit, 1=good */
ed11f1ea DA	28	#define CTRL_TO_BIT 7 /* Regulator timeout bit, 1=wait */
29041449 DA	29
	30	#define MAX_OVERCURRENT_WAIT 3 /* Overcurrent wait must be <= this */
	31
	32	/**
	33	* struct tps65090_regulator - Per-regulator data for a tps65090 regulator
	34	*
	35	* @dev: Pointer to our device.
	36	* @desc: The struct regulator_desc for the regulator.
	37	* @rdev: The struct regulator_dev for the regulator.
	38	* @overcurrent_wait_valid: True if overcurrent_wait is valid.
	39	* @overcurrent_wait: For FETs, the value to put in the WTFET bitfield.
	40	*/
	41
452534e5	42	struct tps65090_regulator {
452534e5	43	struct device *dev;
24282a1c LD	44	struct regulator_desc *desc;
24282a1c LD	45	struct regulator_dev *rdev;
29041449 DA	46	bool overcurrent_wait_valid;
29041449 DA	47	int overcurrent_wait;
452534e5 VB	48	};
452534e5 VB	49
f329b175 LD	50	static struct regulator_ops tps65090_ext_control_ops = {
	51	};
	52
29041449 DA	53	/**
	54	* tps65090_reg_set_overcurrent_wait - Setup overcurrent wait
	55	*
	56	* This will set the overcurrent wait time based on what's in the regulator
	57	* info.
	58	*
	59	* @ri: Overall regulator data
	60	* @rdev: Regulator device
	61	*
	62	* Return: 0 if no error, non-zero if there was an error writing the register.
	63	*/
	64	static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri,
	65	struct regulator_dev *rdev)
	66	{
	67	int ret;
	68
	69	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
	70	MAX_OVERCURRENT_WAIT << CTRL_WT_BIT,
	71	ri->overcurrent_wait << CTRL_WT_BIT);
	72	if (ret) {
	73	dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n",
	74	rdev->desc->enable_reg);
	75	}
	76
	77	return ret;
	78	}
	79
ed11f1ea DA	80	/**
	81	* tps65090_try_enable_fet - Try to enable a FET
	82	*
	83	* @rdev: Regulator device
	84	*
	85	* Return: 0 if ok, -ENOTRECOVERABLE if the FET power good bit did not get
	86	* set, or some other -ve value if another error occurred (e.g. i2c error)
	87	*/
	88	static int tps65090_try_enable_fet(struct regulator_dev *rdev)
	89	{
	90	unsigned int control;
	91	int ret, i;
	92
	93	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
	94	rdev->desc->enable_mask,
	95	rdev->desc->enable_mask);
	96	if (ret < 0) {
	97	dev_err(&rdev->dev, "Error in updating reg %#x\n",
	98	rdev->desc->enable_reg);
	99	return ret;
	100	}
	101
	102	for (i = 0; i < MAX_CTRL_READ_TRIES; i++) {
	103	ret = regmap_read(rdev->regmap, rdev->desc->enable_reg,
	104	&control);
	105	if (ret < 0)
	106	return ret;
	107
	108	if (!(control & BIT(CTRL_TO_BIT)))
	109	break;
	110
	111	usleep_range(1000, 1500);
	112	}
	113	if (!(control & BIT(CTRL_PG_BIT)))
	114	return -ENOTRECOVERABLE;
	115
	116	return 0;
	117	}
	118
	119	/**
	120	* tps65090_fet_enable - Enable a FET, trying a few times if it fails
	121	*
	122	* Some versions of the tps65090 have issues when turning on the FETs.
	123	* This function goes through several steps to ensure the best chance of the
	124	* FET going on. Specifically:
	125	* - We'll make sure that we bump the "overcurrent wait" to the maximum, which
	126	* increases the chances that we'll turn on properly.
	127	* - We'll retry turning the FET on multiple times (turning off in between).
	128	*
	129	* @rdev: Regulator device
	130	*
	131	* Return: 0 if ok, non-zero if it fails.
	132	*/
	133	static int tps65090_fet_enable(struct regulator_dev *rdev)
	134	{
	135	int ret, tries;
	136
	137	/*
	138	* Try enabling multiple times until we succeed since sometimes the
	139	* first try times out.
	140	*/
	141	tries = 0;
	142	while (true) {
	143	ret = tps65090_try_enable_fet(rdev);
144	if (!ret)
145	break;
146	if (ret != -ENOTRECOVERABLE \|\| tries == MAX_FET_ENABLE_TRIES)
147	goto err;
148
149	/* Try turning the FET off (and then on again) */
150	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
151	rdev->desc->enable_mask, 0);
152	if (ret)
153	goto err;
154
155	tries++;
156	}
157
158	if (tries)
159	dev_warn(&rdev->dev, "reg %#x enable ok after %d tries\n",
160	rdev->desc->enable_reg, tries);
161
162	return 0;
163	err:
164	dev_warn(&rdev->dev, "reg %#x enable failed\n", rdev->desc->enable_reg);
165	WARN_ON(1);
166
167	return ret;
168	}
169
170	static struct regulator_ops tps65090_reg_control_ops = {
f329b175 LD	171	.enable = regulator_enable_regmap,
	172	.disable = regulator_disable_regmap,
	173	.is_enabled = regulator_is_enabled_regmap,
452534e5 VB	174	};
452534e5 VB	175
ed11f1ea DA	176	static struct regulator_ops tps65090_fet_control_ops = {
	177	.enable = tps65090_fet_enable,
	178	.disable = regulator_disable_regmap,
	179	.is_enabled = regulator_is_enabled_regmap,
	180	};
	181
3a81ef8c LD	182	static struct regulator_ops tps65090_ldo_ops = {
	183	};
	184
4f2352cf	185	#define tps65090_REG_DESC(_id, _sname, _en_reg, _en_bits, _nvolt, _volt, _ops) \
452534e5	186	{ \
24282a1c LD	187	.name = "TPS65090_RAILS"#_id, \
24282a1c LD	188	.supply_name = _sname, \
8620ca9f	189	.id = TPS65090_REGULATOR_##_id, \
4f2352cf	190	.n_voltages = _nvolt, \
24282a1c	191	.ops = &_ops, \
4f2352cf	192	.fixed_uV = _volt, \
24282a1c	193	.enable_reg = _en_reg, \
ed11f1ea DA	194	.enable_val = _en_bits, \
ed11f1ea DA	195	.enable_mask = _en_bits, \
24282a1c LD	196	.type = REGULATOR_VOLTAGE, \
24282a1c LD	197	.owner = THIS_MODULE, \
452534e5 VB	198	}
452534e5 VB	199
4f2352cf JMC	200	#define tps65090_REG_FIXEDV(_id, _sname, en_reg, _en_bits, _volt, _ops) \
	201	tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 1, _volt, _ops)
	202
	203	#define tps65090_REG_SWITCH(_id, _sname, en_reg, _en_bits, _ops) \
	204	tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 0, 0, _ops)
	205
24282a1c	206	static struct regulator_desc tps65090_regulator_desc[] = {
4f2352cf JMC	207	tps65090_REG_FIXEDV(DCDC1, "vsys1", 0x0C, BIT(CTRL_EN_BIT), 5000000,
	208	tps65090_reg_control_ops),
	209	tps65090_REG_FIXEDV(DCDC2, "vsys2", 0x0D, BIT(CTRL_EN_BIT), 3300000,
	210	tps65090_reg_control_ops),
	211	tps65090_REG_SWITCH(DCDC3, "vsys3", 0x0E, BIT(CTRL_EN_BIT),
	212	tps65090_reg_control_ops),
	213
	214	tps65090_REG_SWITCH(FET1, "infet1", 0x0F,
	215	BIT(CTRL_EN_BIT) \| BIT(CTRL_PG_BIT),
	216	tps65090_fet_control_ops),
	217	tps65090_REG_SWITCH(FET2, "infet2", 0x10,
	218	BIT(CTRL_EN_BIT) \| BIT(CTRL_PG_BIT),
	219	tps65090_fet_control_ops),
	220	tps65090_REG_SWITCH(FET3, "infet3", 0x11,
	221	BIT(CTRL_EN_BIT) \| BIT(CTRL_PG_BIT),
	222	tps65090_fet_control_ops),
	223	tps65090_REG_SWITCH(FET4, "infet4", 0x12,
	224	BIT(CTRL_EN_BIT) \| BIT(CTRL_PG_BIT),
	225	tps65090_fet_control_ops),
	226	tps65090_REG_SWITCH(FET5, "infet5", 0x13,
	227	BIT(CTRL_EN_BIT) \| BIT(CTRL_PG_BIT),
	228	tps65090_fet_control_ops),
	229	tps65090_REG_SWITCH(FET6, "infet6", 0x14,
	230	BIT(CTRL_EN_BIT) \| BIT(CTRL_PG_BIT),
	231	tps65090_fet_control_ops),
	232	tps65090_REG_SWITCH(FET7, "infet7", 0x15,
	233	BIT(CTRL_EN_BIT) \| BIT(CTRL_PG_BIT),
	234	tps65090_fet_control_ops),
	235
	236	tps65090_REG_FIXEDV(LDO1, "vsys-l1", 0, 0, 5000000,
	237	tps65090_ldo_ops),
	238	tps65090_REG_FIXEDV(LDO2, "vsys-l2", 0, 0, 3300000,
	239	tps65090_ldo_ops),
452534e5 VB	240	};
452534e5 VB	241
24282a1c	242	static inline bool is_dcdc(int id)
452534e5	243	{
24282a1c	244	switch (id) {
8620ca9f LD	245	case TPS65090_REGULATOR_DCDC1:
	246	case TPS65090_REGULATOR_DCDC2:
	247	case TPS65090_REGULATOR_DCDC3:
24282a1c LD	248	return true;
	249	default:
	250	return false;
	251	}
	252	}
452534e5	253
a5023574	254	static int tps65090_config_ext_control(
24282a1c LD	255	struct tps65090_regulator *ri, bool enable)
	256	{
	257	int ret;
	258	struct device *parent = ri->dev->parent;
	259	unsigned int reg_en_reg = ri->desc->enable_reg;
	260
	261	if (enable)
	262	ret = tps65090_set_bits(parent, reg_en_reg, 1);
	263	else
	264	ret = tps65090_clr_bits(parent, reg_en_reg, 1);
	265	if (ret < 0)
	266	dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
	267	return ret;
	268	}
	269
a5023574	270	static int tps65090_regulator_disable_ext_control(
24282a1c LD	271	struct tps65090_regulator *ri,
	272	struct tps65090_regulator_plat_data *tps_pdata)
	273	{
	274	int ret = 0;
	275	struct device *parent = ri->dev->parent;
	276	unsigned int reg_en_reg = ri->desc->enable_reg;
	277
	278	/*
	279	* First enable output for internal control if require.
	280	* And then disable external control.
	281	*/
	282	if (tps_pdata->reg_init_data->constraints.always_on \|\|
	283	tps_pdata->reg_init_data->constraints.boot_on) {
	284	ret = tps65090_set_bits(parent, reg_en_reg, 0);
	285	if (ret < 0) {
	286	dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
	287	return ret;
	288	}
452534e5	289	}
24282a1c	290	return tps65090_config_ext_control(ri, false);
452534e5 VB	291	}
452534e5 VB	292
6c7a7a0e LD	293	#ifdef CONFIG_OF
	294	static struct of_regulator_match tps65090_matches[] = {
	295	{ .name = "dcdc1", },
	296	{ .name = "dcdc2", },
	297	{ .name = "dcdc3", },
	298	{ .name = "fet1", },
	299	{ .name = "fet2", },
	300	{ .name = "fet3", },
	301	{ .name = "fet4", },
	302	{ .name = "fet5", },
	303	{ .name = "fet6", },
	304	{ .name = "fet7", },
	305	{ .name = "ldo1", },
	306	{ .name = "ldo2", },
	307	};
	308
	309	static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
	310	struct platform_device *pdev,
	311	struct of_regulator_match **tps65090_reg_matches)
	312	{
	313	struct tps65090_platform_data *tps65090_pdata;
	314	struct device_node *np = pdev->dev.parent->of_node;
	315	struct device_node *regulators;
	316	int idx = 0, ret;
	317	struct tps65090_regulator_plat_data *reg_pdata;
	318
	319	tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata),
	320	GFP_KERNEL);
0ad91c69	321	if (!tps65090_pdata)
6c7a7a0e	322	return ERR_PTR(-ENOMEM);
6c7a7a0e	323
a86854d0 KC	324	reg_pdata = devm_kcalloc(&pdev->dev,
	325	TPS65090_REGULATOR_MAX, sizeof(*reg_pdata),
	326	GFP_KERNEL);
0ad91c69	327	if (!reg_pdata)
6c7a7a0e	328	return ERR_PTR(-ENOMEM);
6c7a7a0e	329
4c850ead	330	regulators = of_get_child_by_name(np, "regulators");
6c7a7a0e LD	331	if (!regulators) {
	332	dev_err(&pdev->dev, "regulator node not found\n");
	333	return ERR_PTR(-ENODEV);
	334	}
	335
09a228e7	336	ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches,
6c7a7a0e	337	ARRAY_SIZE(tps65090_matches));
026cdfe6	338	of_node_put(regulators);
6c7a7a0e LD	339	if (ret < 0) {
	340	dev_err(&pdev->dev,
	341	"Error parsing regulator init data: %d\n", ret);
	342	return ERR_PTR(ret);
	343	}
	344
	345	*tps65090_reg_matches = tps65090_matches;
	346	for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) {
	347	struct regulator_init_data *ri_data;
	348	struct tps65090_regulator_plat_data *rpdata;
	349
	350	rpdata = &reg_pdata[idx];
	351	ri_data = tps65090_matches[idx].init_data;
	352	if (!ri_data \|\| !tps65090_matches[idx].of_node)
	353	continue;
	354
	355	rpdata->reg_init_data = ri_data;
	356	rpdata->enable_ext_control = of_property_read_bool(
	357	tps65090_matches[idx].of_node,
	358	"ti,enable-ext-control");
3012e814 LW	359	if (rpdata->enable_ext_control) {
	360	enum gpiod_flags gflags;
	361
	362	if (ri_data->constraints.always_on \|\|
	363	ri_data->constraints.boot_on)
	364	gflags = GPIOD_OUT_HIGH;
	365	else
	366	gflags = GPIOD_OUT_LOW;
63239e4b	367	gflags \|= GPIOD_FLAGS_BIT_NONEXCLUSIVE;
3012e814 LW	368
	369	rpdata->gpiod = devm_gpiod_get_from_of_node(&pdev->dev,
	370	tps65090_matches[idx].of_node,
	371	"dcdc-ext-control-gpios", 0,
	372	gflags,
	373	"tps65090");
025bf377	374	if (PTR_ERR(rpdata->gpiod) == -ENOENT) {
3012e814 LW	375	dev_err(&pdev->dev,
3012e814 LW	376	"could not find DCDC external control GPIO\n");
025bf377 WG	377	rpdata->gpiod = NULL;
	378	} else if (IS_ERR(rpdata->gpiod))
	379	return ERR_CAST(rpdata->gpiod);
3012e814	380	}
6c7a7a0e	381
29041449 DA	382	if (of_property_read_u32(tps65090_matches[idx].of_node,
	383	"ti,overcurrent-wait",
	384	&rpdata->overcurrent_wait) == 0)
	385	rpdata->overcurrent_wait_valid = true;
	386
6c7a7a0e LD	387	tps65090_pdata->reg_pdata[idx] = rpdata;
	388	}
	389	return tps65090_pdata;
	390	}
	391	#else
	392	static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data(
	393	struct platform_device *pdev,
	394	struct of_regulator_match **tps65090_reg_matches)
	395	{
	396	*tps65090_reg_matches = NULL;
	397	return NULL;
	398	}
	399	#endif
	400
a5023574	401	static int tps65090_regulator_probe(struct platform_device *pdev)
452534e5	402	{
06c4998b	403	struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
452534e5	404	struct tps65090_regulator *ri = NULL;
c172708d	405	struct regulator_config config = { };
452534e5	406	struct regulator_dev *rdev;
24282a1c LD	407	struct tps65090_regulator_plat_data *tps_pdata;
	408	struct tps65090_regulator *pmic;
	409	struct tps65090_platform_data *tps65090_pdata;
6c7a7a0e	410	struct of_regulator_match *tps65090_reg_matches = NULL;
24282a1c LD	411	int num;
24282a1c LD	412	int ret;
452534e5	413
24282a1c	414	dev_dbg(&pdev->dev, "Probing regulator\n");
452534e5	415
24282a1c	416	tps65090_pdata = dev_get_platdata(pdev->dev.parent);
6c7a7a0e LD	417	if (!tps65090_pdata && tps65090_mfd->dev->of_node)
	418	tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
	419	&tps65090_reg_matches);
	420	if (IS_ERR_OR_NULL(tps65090_pdata)) {
24282a1c	421	dev_err(&pdev->dev, "Platform data missing\n");
6c7a7a0e	422	return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
452534e5	423	}
24282a1c	424
a86854d0 KC	425	pmic = devm_kcalloc(&pdev->dev,
	426	TPS65090_REGULATOR_MAX, sizeof(*pmic),
	427	GFP_KERNEL);
0ad91c69	428	if (!pmic)
24282a1c	429	return -ENOMEM;
24282a1c	430
8620ca9f	431	for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
24282a1c LD	432	tps_pdata = tps65090_pdata->reg_pdata[num];
	433
	434	ri = &pmic[num];
	435	ri->dev = &pdev->dev;
	436	ri->desc = &tps65090_regulator_desc[num];
c122c5b6 DA	437	if (tps_pdata) {
	438	ri->overcurrent_wait_valid =
	439	tps_pdata->overcurrent_wait_valid;
	440	ri->overcurrent_wait = tps_pdata->overcurrent_wait;
	441	}
24282a1c LD	442
	443	/*
	444	* TPS5090 DCDC support the control from external digital input.
f329b175	445	* Configure it as per platform data.
24282a1c LD	446	*/
24282a1c LD	447	if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
f329b175	448	if (tps_pdata->enable_ext_control) {
3012e814	449	config.ena_gpiod = tps_pdata->gpiod;
f329b175 LD	450	ri->desc->ops = &tps65090_ext_control_ops;
	451	} else {
	452	ret = tps65090_regulator_disable_ext_control(
24282a1c	453	ri, tps_pdata);
f329b175 LD	454	if (ret < 0) {
f329b175 LD	455	dev_err(&pdev->dev,
24282a1c	456	"failed disable ext control\n");
9738efae	457	return ret;
f329b175	458	}
24282a1c LD	459	}
24282a1c LD	460	}
f329b175	461
6c7a7a0e	462	config.dev = pdev->dev.parent;
24282a1c LD	463	config.driver_data = ri;
	464	config.regmap = tps65090_mfd->rmap;
	465	if (tps_pdata)
	466	config.init_data = tps_pdata->reg_init_data;
	467	else
	468	config.init_data = NULL;
6c7a7a0e LD	469	if (tps65090_reg_matches)
	470	config.of_node = tps65090_reg_matches[num].of_node;
	471	else
	472	config.of_node = NULL;
24282a1c	473
870311e5 LW	474	/*
	475	* Hand the GPIO descriptor management over to the regulator
	476	* core, remove it from devres management.
	477	*/
	478	if (config.ena_gpiod)
	479	devm_gpiod_unhinge(&pdev->dev, config.ena_gpiod);
9738efae	480	rdev = devm_regulator_register(&pdev->dev, ri->desc, &config);
24282a1c LD	481	if (IS_ERR(rdev)) {
	482	dev_err(&pdev->dev, "failed to register regulator %s\n",
	483	ri->desc->name);
9738efae	484	return PTR_ERR(rdev);
24282a1c LD	485	}
24282a1c LD	486	ri->rdev = rdev;
f329b175	487
29041449 DA	488	if (ri->overcurrent_wait_valid) {
	489	ret = tps65090_reg_set_overcurrent_wait(ri, rdev);
	490	if (ret < 0)
	491	return ret;
	492	}
	493
f329b175 LD	494	/* Enable external control if it is require */
	495	if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
	496	tps_pdata->enable_ext_control) {
	497	ret = tps65090_config_ext_control(ri, true);
9738efae SK	498	if (ret < 0)
9738efae SK	499	return ret;
f329b175	500	}
452534e5 VB	501	}
452534e5 VB	502
24282a1c	503	platform_set_drvdata(pdev, pmic);
452534e5	504	return 0;
452534e5 VB	505	}
	506
	507	static struct platform_driver tps65090_regulator_driver = {
	508	.driver = {
8620ca9f	509	.name = "tps65090-pmic",
452534e5 VB	510	},
452534e5 VB	511	.probe = tps65090_regulator_probe,
452534e5 VB	512	};
	513
	514	static int __init tps65090_regulator_init(void)
	515	{
	516	return platform_driver_register(&tps65090_regulator_driver);
	517	}
	518	subsys_initcall(tps65090_regulator_init);
	519
	520	static void __exit tps65090_regulator_exit(void)
	521	{
	522	platform_driver_unregister(&tps65090_regulator_driver);
	523	}
	524	module_exit(tps65090_regulator_exit);
	525
	526	MODULE_DESCRIPTION("tps65090 regulator driver");
	527	MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
	528	MODULE_LICENSE("GPL v2");
d95420b8	529	MODULE_ALIAS("platform:tps65090-pmic");