xref: /linux/drivers/regulator/tps65132-regulator.c (revision 9b61b2069681b60d0d0bedbd0fe3c70123dddb19)
177c129bfSVenkat Reddy Talla /*
277c129bfSVenkat Reddy Talla  * TI TPS65132 Regulator driver
377c129bfSVenkat Reddy Talla  *
477c129bfSVenkat Reddy Talla  * Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved.
577c129bfSVenkat Reddy Talla  *
677c129bfSVenkat Reddy Talla  * Author: Venkat Reddy Talla <vreddytalla@nvidia.com>
777c129bfSVenkat Reddy Talla  *		Laxman Dewangan <ldewangan@nvidia.com>
877c129bfSVenkat Reddy Talla  *
977c129bfSVenkat Reddy Talla  * This program is free software; you can redistribute it and/or
1077c129bfSVenkat Reddy Talla  * modify it under the terms of the GNU General Public License as
1177c129bfSVenkat Reddy Talla  * published by the Free Software Foundation; either version 2 of the
1277c129bfSVenkat Reddy Talla  * License, or (at your option) any later version.
1377c129bfSVenkat Reddy Talla  *
1477c129bfSVenkat Reddy Talla  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
1577c129bfSVenkat Reddy Talla  * whether express or implied; without even the implied warranty of
1677c129bfSVenkat Reddy Talla  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
1777c129bfSVenkat Reddy Talla  * General Public License for more details.
1877c129bfSVenkat Reddy Talla  */
1977c129bfSVenkat Reddy Talla 
2077c129bfSVenkat Reddy Talla #include <linux/delay.h>
2177c129bfSVenkat Reddy Talla #include <linux/err.h>
2277c129bfSVenkat Reddy Talla #include <linux/gpio/consumer.h>
2377c129bfSVenkat Reddy Talla #include <linux/i2c.h>
2477c129bfSVenkat Reddy Talla #include <linux/module.h>
2577c129bfSVenkat Reddy Talla #include <linux/regmap.h>
2677c129bfSVenkat Reddy Talla #include <linux/regulator/driver.h>
2777c129bfSVenkat Reddy Talla #include <linux/regulator/machine.h>
2877c129bfSVenkat Reddy Talla 
2977c129bfSVenkat Reddy Talla #define TPS65132_REG_VPOS		0x00
3077c129bfSVenkat Reddy Talla #define TPS65132_REG_VNEG		0x01
3177c129bfSVenkat Reddy Talla #define TPS65132_REG_APPS_DISP_DISN	0x03
3277c129bfSVenkat Reddy Talla #define TPS65132_REG_CONTROL		0x0FF
3377c129bfSVenkat Reddy Talla 
3477c129bfSVenkat Reddy Talla #define TPS65132_VOUT_MASK		0x1F
3577c129bfSVenkat Reddy Talla #define TPS65132_VOUT_N_VOLTAGE		0x15
3677c129bfSVenkat Reddy Talla #define TPS65132_VOUT_VMIN		4000000
3777c129bfSVenkat Reddy Talla #define TPS65132_VOUT_VMAX		6000000
3877c129bfSVenkat Reddy Talla #define TPS65132_VOUT_STEP		100000
3977c129bfSVenkat Reddy Talla 
4077c129bfSVenkat Reddy Talla #define TPS65132_REG_APPS_DIS_VPOS		BIT(0)
4177c129bfSVenkat Reddy Talla #define TPS65132_REG_APPS_DIS_VNEG		BIT(1)
4277c129bfSVenkat Reddy Talla 
4377c129bfSVenkat Reddy Talla #define TPS65132_REGULATOR_ID_VPOS	0
4477c129bfSVenkat Reddy Talla #define TPS65132_REGULATOR_ID_VNEG	1
4577c129bfSVenkat Reddy Talla #define TPS65132_MAX_REGULATORS		2
4677c129bfSVenkat Reddy Talla 
4777c129bfSVenkat Reddy Talla #define TPS65132_ACT_DIS_TIME_SLACK		1000
4877c129bfSVenkat Reddy Talla 
4977c129bfSVenkat Reddy Talla struct tps65132_reg_pdata {
5077c129bfSVenkat Reddy Talla 	struct gpio_desc *en_gpiod;
5177c129bfSVenkat Reddy Talla 	struct gpio_desc *act_dis_gpiod;
5277c129bfSVenkat Reddy Talla 	unsigned int act_dis_time_us;
5377c129bfSVenkat Reddy Talla 	int ena_gpio_state;
5477c129bfSVenkat Reddy Talla };
5577c129bfSVenkat Reddy Talla 
5677c129bfSVenkat Reddy Talla struct tps65132_regulator {
5777c129bfSVenkat Reddy Talla 	struct device *dev;
5877c129bfSVenkat Reddy Talla 	struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];
5977c129bfSVenkat Reddy Talla };
6077c129bfSVenkat Reddy Talla 
tps65132_regulator_enable(struct regulator_dev * rdev)6177c129bfSVenkat Reddy Talla static int tps65132_regulator_enable(struct regulator_dev *rdev)
6277c129bfSVenkat Reddy Talla {
6377c129bfSVenkat Reddy Talla 	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
6477c129bfSVenkat Reddy Talla 	int id = rdev_get_id(rdev);
6577c129bfSVenkat Reddy Talla 	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
6677c129bfSVenkat Reddy Talla 	int ret;
6777c129bfSVenkat Reddy Talla 
6877c129bfSVenkat Reddy Talla 	if (!IS_ERR(rpdata->en_gpiod)) {
6977c129bfSVenkat Reddy Talla 		gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
7077c129bfSVenkat Reddy Talla 		rpdata->ena_gpio_state = 1;
7177c129bfSVenkat Reddy Talla 	}
7277c129bfSVenkat Reddy Talla 
7377c129bfSVenkat Reddy Talla 	/* Hardware automatically enable discharge bit in enable */
7477c129bfSVenkat Reddy Talla 	if (rdev->constraints->active_discharge ==
7577c129bfSVenkat Reddy Talla 			REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
7677c129bfSVenkat Reddy Talla 		ret = regulator_set_active_discharge_regmap(rdev, false);
7777c129bfSVenkat Reddy Talla 		if (ret < 0) {
7877c129bfSVenkat Reddy Talla 			dev_err(tps->dev, "Failed to disable active discharge: %d\n",
7977c129bfSVenkat Reddy Talla 				ret);
8077c129bfSVenkat Reddy Talla 			return ret;
8177c129bfSVenkat Reddy Talla 		}
8277c129bfSVenkat Reddy Talla 	}
8377c129bfSVenkat Reddy Talla 
8477c129bfSVenkat Reddy Talla 	return 0;
8577c129bfSVenkat Reddy Talla }
8677c129bfSVenkat Reddy Talla 
tps65132_regulator_disable(struct regulator_dev * rdev)8777c129bfSVenkat Reddy Talla static int tps65132_regulator_disable(struct regulator_dev *rdev)
8877c129bfSVenkat Reddy Talla {
8977c129bfSVenkat Reddy Talla 	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
9077c129bfSVenkat Reddy Talla 	int id = rdev_get_id(rdev);
9177c129bfSVenkat Reddy Talla 	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
9277c129bfSVenkat Reddy Talla 
9377c129bfSVenkat Reddy Talla 	if (!IS_ERR(rpdata->en_gpiod)) {
9477c129bfSVenkat Reddy Talla 		gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
9577c129bfSVenkat Reddy Talla 		rpdata->ena_gpio_state = 0;
9677c129bfSVenkat Reddy Talla 	}
9777c129bfSVenkat Reddy Talla 
9877c129bfSVenkat Reddy Talla 	if (!IS_ERR(rpdata->act_dis_gpiod)) {
9977c129bfSVenkat Reddy Talla 		gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1);
10077c129bfSVenkat Reddy Talla 		usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us +
10177c129bfSVenkat Reddy Talla 			     TPS65132_ACT_DIS_TIME_SLACK);
10277c129bfSVenkat Reddy Talla 		gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0);
10377c129bfSVenkat Reddy Talla 	}
10477c129bfSVenkat Reddy Talla 
10577c129bfSVenkat Reddy Talla 	return 0;
10677c129bfSVenkat Reddy Talla }
10777c129bfSVenkat Reddy Talla 
tps65132_regulator_is_enabled(struct regulator_dev * rdev)10877c129bfSVenkat Reddy Talla static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
10977c129bfSVenkat Reddy Talla {
11077c129bfSVenkat Reddy Talla 	struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
11177c129bfSVenkat Reddy Talla 	int id = rdev_get_id(rdev);
11277c129bfSVenkat Reddy Talla 	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
11377c129bfSVenkat Reddy Talla 
11477c129bfSVenkat Reddy Talla 	if (!IS_ERR(rpdata->en_gpiod))
11577c129bfSVenkat Reddy Talla 		return rpdata->ena_gpio_state;
11677c129bfSVenkat Reddy Talla 
11777c129bfSVenkat Reddy Talla 	return 1;
11877c129bfSVenkat Reddy Talla }
11977c129bfSVenkat Reddy Talla 
1204e105e3bSAxel Lin static const struct regulator_ops tps65132_regulator_ops = {
12177c129bfSVenkat Reddy Talla 	.enable = tps65132_regulator_enable,
12277c129bfSVenkat Reddy Talla 	.disable = tps65132_regulator_disable,
12377c129bfSVenkat Reddy Talla 	.is_enabled = tps65132_regulator_is_enabled,
12477c129bfSVenkat Reddy Talla 	.list_voltage = regulator_list_voltage_linear,
12577c129bfSVenkat Reddy Talla 	.map_voltage = regulator_map_voltage_linear,
12677c129bfSVenkat Reddy Talla 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
12777c129bfSVenkat Reddy Talla 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
12877c129bfSVenkat Reddy Talla 	.set_active_discharge = regulator_set_active_discharge_regmap,
12977c129bfSVenkat Reddy Talla };
13077c129bfSVenkat Reddy Talla 
tps65132_of_parse_cb(struct device_node * np,const struct regulator_desc * desc,struct regulator_config * config)13177c129bfSVenkat Reddy Talla static int tps65132_of_parse_cb(struct device_node *np,
13277c129bfSVenkat Reddy Talla 				const struct regulator_desc *desc,
13377c129bfSVenkat Reddy Talla 				struct regulator_config *config)
13477c129bfSVenkat Reddy Talla {
13577c129bfSVenkat Reddy Talla 	struct tps65132_regulator *tps = config->driver_data;
13677c129bfSVenkat Reddy Talla 	struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id];
13777c129bfSVenkat Reddy Talla 	int ret;
13877c129bfSVenkat Reddy Talla 
13922803ca3SDmitry Torokhov 	rpdata->en_gpiod = devm_fwnode_gpiod_get(tps->dev, of_fwnode_handle(np),
14022803ca3SDmitry Torokhov 						 "enable", GPIOD_ASIS,
14122803ca3SDmitry Torokhov 						 "enable");
14222803ca3SDmitry Torokhov 	if (IS_ERR(rpdata->en_gpiod)) {
14377c129bfSVenkat Reddy Talla 		ret = PTR_ERR(rpdata->en_gpiod);
14477c129bfSVenkat Reddy Talla 
14577c129bfSVenkat Reddy Talla 		/* Ignore the error other than probe defer */
14677c129bfSVenkat Reddy Talla 		if (ret == -EPROBE_DEFER)
14777c129bfSVenkat Reddy Talla 			return ret;
14877c129bfSVenkat Reddy Talla 		return 0;
14977c129bfSVenkat Reddy Talla 	}
15077c129bfSVenkat Reddy Talla 
15122803ca3SDmitry Torokhov 	rpdata->act_dis_gpiod = devm_fwnode_gpiod_get(tps->dev,
15222803ca3SDmitry Torokhov 						      of_fwnode_handle(np),
15322803ca3SDmitry Torokhov 						      "active-discharge",
15422803ca3SDmitry Torokhov 						      GPIOD_ASIS,
15522803ca3SDmitry Torokhov 						      "active-discharge");
15622803ca3SDmitry Torokhov 	if (IS_ERR(rpdata->act_dis_gpiod)) {
15777c129bfSVenkat Reddy Talla 		ret = PTR_ERR(rpdata->act_dis_gpiod);
15877c129bfSVenkat Reddy Talla 
15977c129bfSVenkat Reddy Talla 		/* Ignore the error other than probe defer */
16077c129bfSVenkat Reddy Talla 		if (ret == -EPROBE_DEFER)
16177c129bfSVenkat Reddy Talla 			return ret;
16277c129bfSVenkat Reddy Talla 
16377c129bfSVenkat Reddy Talla 		return 0;
16477c129bfSVenkat Reddy Talla 	}
16577c129bfSVenkat Reddy Talla 
16677c129bfSVenkat Reddy Talla 	ret = of_property_read_u32(np, "ti,active-discharge-time-us",
16777c129bfSVenkat Reddy Talla 				   &rpdata->act_dis_time_us);
16877c129bfSVenkat Reddy Talla 	if (ret < 0) {
16977c129bfSVenkat Reddy Talla 		dev_err(tps->dev, "Failed to read active discharge time:%d\n",
17077c129bfSVenkat Reddy Talla 			ret);
17177c129bfSVenkat Reddy Talla 		return ret;
17277c129bfSVenkat Reddy Talla 	}
17377c129bfSVenkat Reddy Talla 
17477c129bfSVenkat Reddy Talla 	return 0;
17577c129bfSVenkat Reddy Talla }
17677c129bfSVenkat Reddy Talla 
17777c129bfSVenkat Reddy Talla #define TPS65132_REGULATOR_DESC(_id, _name)		\
17877c129bfSVenkat Reddy Talla 	[TPS65132_REGULATOR_ID_##_id] = {		\
17977c129bfSVenkat Reddy Talla 		.name = "tps65132-"#_name,		\
18077c129bfSVenkat Reddy Talla 		.supply_name = "vin",			\
18177c129bfSVenkat Reddy Talla 		.id = TPS65132_REGULATOR_ID_##_id,	\
18277c129bfSVenkat Reddy Talla 		.of_match = of_match_ptr(#_name),	\
18377c129bfSVenkat Reddy Talla 		.of_parse_cb	= tps65132_of_parse_cb,	\
18477c129bfSVenkat Reddy Talla 		.ops = &tps65132_regulator_ops,		\
18577c129bfSVenkat Reddy Talla 		.n_voltages = TPS65132_VOUT_N_VOLTAGE,	\
18677c129bfSVenkat Reddy Talla 		.min_uV = TPS65132_VOUT_VMIN,		\
18777c129bfSVenkat Reddy Talla 		.uV_step = TPS65132_VOUT_STEP,		\
18877c129bfSVenkat Reddy Talla 		.enable_time = 500,			\
18977c129bfSVenkat Reddy Talla 		.vsel_mask = TPS65132_VOUT_MASK,	\
19077c129bfSVenkat Reddy Talla 		.vsel_reg = TPS65132_REG_##_id,		\
19177c129bfSVenkat Reddy Talla 		.active_discharge_off = 0,			\
19277c129bfSVenkat Reddy Talla 		.active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \
19377c129bfSVenkat Reddy Talla 		.active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \
19477c129bfSVenkat Reddy Talla 		.active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \
19577c129bfSVenkat Reddy Talla 		.type = REGULATOR_VOLTAGE,		\
19677c129bfSVenkat Reddy Talla 		.owner = THIS_MODULE,			\
19777c129bfSVenkat Reddy Talla 	}
19877c129bfSVenkat Reddy Talla 
1994e105e3bSAxel Lin static const struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = {
20077c129bfSVenkat Reddy Talla 	TPS65132_REGULATOR_DESC(VPOS, outp),
20177c129bfSVenkat Reddy Talla 	TPS65132_REGULATOR_DESC(VNEG, outn),
20277c129bfSVenkat Reddy Talla };
20377c129bfSVenkat Reddy Talla 
20477c129bfSVenkat Reddy Talla static const struct regmap_range tps65132_no_reg_ranges[] = {
20577c129bfSVenkat Reddy Talla 	regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,
20677c129bfSVenkat Reddy Talla 			 TPS65132_REG_CONTROL - 1),
20777c129bfSVenkat Reddy Talla };
20877c129bfSVenkat Reddy Talla 
20977c129bfSVenkat Reddy Talla static const struct regmap_access_table tps65132_no_reg_table = {
21077c129bfSVenkat Reddy Talla 	.no_ranges = tps65132_no_reg_ranges,
21177c129bfSVenkat Reddy Talla 	.n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),
21277c129bfSVenkat Reddy Talla };
21377c129bfSVenkat Reddy Talla 
21477c129bfSVenkat Reddy Talla static const struct regmap_config tps65132_regmap_config = {
21577c129bfSVenkat Reddy Talla 	.reg_bits	= 8,
21677c129bfSVenkat Reddy Talla 	.val_bits	= 8,
2175abca06cSAxel Lin 	.max_register	= TPS65132_REG_CONTROL,
21877c129bfSVenkat Reddy Talla 	.cache_type	= REGCACHE_NONE,
21977c129bfSVenkat Reddy Talla 	.rd_table	= &tps65132_no_reg_table,
22077c129bfSVenkat Reddy Talla 	.wr_table	= &tps65132_no_reg_table,
22177c129bfSVenkat Reddy Talla };
22277c129bfSVenkat Reddy Talla 
tps65132_probe(struct i2c_client * client)22377e29598SAxel Lin static int tps65132_probe(struct i2c_client *client)
22477c129bfSVenkat Reddy Talla {
22577c129bfSVenkat Reddy Talla 	struct device *dev = &client->dev;
22677c129bfSVenkat Reddy Talla 	struct tps65132_regulator *tps;
2272e62e033SAxel Lin 	struct regulator_dev *rdev;
2282e62e033SAxel Lin 	struct regmap *rmap;
22977c129bfSVenkat Reddy Talla 	struct regulator_config config = { };
23077c129bfSVenkat Reddy Talla 	int id;
23177c129bfSVenkat Reddy Talla 	int ret;
23277c129bfSVenkat Reddy Talla 
23377c129bfSVenkat Reddy Talla 	tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
23477c129bfSVenkat Reddy Talla 	if (!tps)
23577c129bfSVenkat Reddy Talla 		return -ENOMEM;
23677c129bfSVenkat Reddy Talla 
2372e62e033SAxel Lin 	rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
2382e62e033SAxel Lin 	if (IS_ERR(rmap)) {
2392e62e033SAxel Lin 		ret = PTR_ERR(rmap);
24077c129bfSVenkat Reddy Talla 		dev_err(dev, "regmap init failed: %d\n", ret);
24177c129bfSVenkat Reddy Talla 		return ret;
24277c129bfSVenkat Reddy Talla 	}
24377c129bfSVenkat Reddy Talla 
24477c129bfSVenkat Reddy Talla 	i2c_set_clientdata(client, tps);
24577c129bfSVenkat Reddy Talla 	tps->dev = dev;
24677c129bfSVenkat Reddy Talla 
24777c129bfSVenkat Reddy Talla 	for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {
2482e62e033SAxel Lin 		config.regmap = rmap;
24977c129bfSVenkat Reddy Talla 		config.dev = dev;
25077c129bfSVenkat Reddy Talla 		config.driver_data = tps;
25177c129bfSVenkat Reddy Talla 
2522e62e033SAxel Lin 		rdev = devm_regulator_register(dev, &tps_regs_desc[id],
2532e62e033SAxel Lin 					       &config);
2542e62e033SAxel Lin 		if (IS_ERR(rdev)) {
2552e62e033SAxel Lin 			ret = PTR_ERR(rdev);
25677c129bfSVenkat Reddy Talla 			dev_err(dev, "regulator %s register failed: %d\n",
2572e62e033SAxel Lin 				tps_regs_desc[id].name, ret);
25877c129bfSVenkat Reddy Talla 			return ret;
25977c129bfSVenkat Reddy Talla 		}
26077c129bfSVenkat Reddy Talla 	}
26177c129bfSVenkat Reddy Talla 	return 0;
26277c129bfSVenkat Reddy Talla }
26377c129bfSVenkat Reddy Talla 
26477c129bfSVenkat Reddy Talla static const struct i2c_device_id tps65132_id[] = {
26577c129bfSVenkat Reddy Talla 	{.name = "tps65132",},
26677c129bfSVenkat Reddy Talla 	{},
26777c129bfSVenkat Reddy Talla };
26877c129bfSVenkat Reddy Talla MODULE_DEVICE_TABLE(i2c, tps65132_id);
26977c129bfSVenkat Reddy Talla 
270*a469158eSAndré Apitzsch static const struct of_device_id __maybe_unused tps65132_of_match[] = {
271*a469158eSAndré Apitzsch 	{ .compatible = "ti,tps65132" },
272*a469158eSAndré Apitzsch 	{},
273*a469158eSAndré Apitzsch };
274*a469158eSAndré Apitzsch MODULE_DEVICE_TABLE(of, tps65132_of_match);
275*a469158eSAndré Apitzsch 
27677c129bfSVenkat Reddy Talla static struct i2c_driver tps65132_i2c_driver = {
27777c129bfSVenkat Reddy Talla 	.driver = {
27877c129bfSVenkat Reddy Talla 		.name = "tps65132",
279259b93b2SDouglas Anderson 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
280*a469158eSAndré Apitzsch 		.of_match_table = of_match_ptr(tps65132_of_match),
28177c129bfSVenkat Reddy Talla 	},
282964e1865SUwe Kleine-König 	.probe = tps65132_probe,
28377c129bfSVenkat Reddy Talla 	.id_table = tps65132_id,
28477c129bfSVenkat Reddy Talla };
28577c129bfSVenkat Reddy Talla 
28677c129bfSVenkat Reddy Talla module_i2c_driver(tps65132_i2c_driver);
28777c129bfSVenkat Reddy Talla 
28877c129bfSVenkat Reddy Talla MODULE_DESCRIPTION("tps65132 regulator driver");
28977c129bfSVenkat Reddy Talla MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");
29077c129bfSVenkat Reddy Talla MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
29177c129bfSVenkat Reddy Talla MODULE_LICENSE("GPL v2");
292