1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Regulator driver for RICOH RC5T583 power management chip.
4 *
5 * Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
6 * Author: Laxman dewangan <ldewangan@nvidia.com>
7 *
8 * based on code
9 * Copyright (C) 2011 RICOH COMPANY,LTD
10 */
11
12#include <linux/module.h>
13#include <linux/init.h>
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>
19#include <linux/mfd/rc5t583.h>
20
21struct rc5t583_regulator_info {
22 int deepsleep_id;
23
24 /* Regulator register address.*/
25 uint8_t reg_disc_reg;
26 uint8_t disc_bit;
27 uint8_t deepsleep_reg;
28
29 /* Regulator specific turn-on delay and voltage settling time*/
30 int enable_uv_per_us;
31
32 /* Used by regulator core */
33 struct regulator_desc desc;
34};
35
36static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
37{
38 struct rc5t583_regulator_info *reg_info = rdev_get_drvdata(rdev);
39 int vsel = regulator_get_voltage_sel_regmap(rdev);
40 int curr_uV = regulator_list_voltage_linear(rdev, selector: vsel);
41
42 return DIV_ROUND_UP(curr_uV, reg_info->enable_uv_per_us);
43}
44
45static const struct regulator_ops rc5t583_ops = {
46 .is_enabled = regulator_is_enabled_regmap,
47 .enable = regulator_enable_regmap,
48 .disable = regulator_disable_regmap,
49 .enable_time = rc5t583_regulator_enable_time,
50 .get_voltage_sel = regulator_get_voltage_sel_regmap,
51 .set_voltage_sel = regulator_set_voltage_sel_regmap,
52 .list_voltage = regulator_list_voltage_linear,
53 .map_voltage = regulator_map_voltage_linear,
54 .set_voltage_time_sel = regulator_set_voltage_time_sel,
55};
56
57#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
58 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
59{ \
60 .reg_disc_reg = RC5T583_REG_##_disc_reg, \
61 .disc_bit = _disc_bit, \
62 .deepsleep_reg = RC5T583_REG_##_id##DAC_DS, \
63 .enable_uv_per_us = _enable_mv * 1000, \
64 .deepsleep_id = RC5T583_DS_##_id, \
65 .desc = { \
66 .name = "rc5t583-regulator-"#_id, \
67 .id = RC5T583_REGULATOR_##_id, \
68 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
69 .ops = &rc5t583_ops, \
70 .type = REGULATOR_VOLTAGE, \
71 .owner = THIS_MODULE, \
72 .vsel_reg = RC5T583_REG_##_id##DAC, \
73 .vsel_mask = _vout_mask, \
74 .enable_reg = RC5T583_REG_##_en_reg, \
75 .enable_mask = BIT(_en_bit), \
76 .min_uV = _min_mv * 1000, \
77 .uV_step = _step_uV, \
78 .ramp_delay = 40 * 1000, \
79 }, \
80}
81
82static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
83 RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
84 RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
85 RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
86 RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
87 RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
88 RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
89 RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
90 RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
91 RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
92 RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
93 RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
94 RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
95 RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
96 RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
97};
98
99static int rc5t583_regulator_probe(struct platform_device *pdev)
100{
101 struct rc5t583 *rc5t583 = dev_get_drvdata(dev: pdev->dev.parent);
102 struct rc5t583_platform_data *pdata = dev_get_platdata(dev: rc5t583->dev);
103 struct regulator_config config = { };
104 struct regulator_dev *rdev;
105 struct rc5t583_regulator_info *ri;
106 int ret;
107 int id;
108
109 if (!pdata) {
110 dev_err(&pdev->dev, "No platform data, exiting...\n");
111 return -ENODEV;
112 }
113
114 for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
115 ri = &rc5t583_reg_info[id];
116
117 if (ri->deepsleep_id == RC5T583_DS_NONE)
118 goto skip_ext_pwr_config;
119
120 ret = rc5t583_ext_power_req_config(dev: rc5t583->dev,
121 deepsleep_id: ri->deepsleep_id,
122 ext_pwr_req: pdata->regulator_ext_pwr_control[id],
123 deepsleep_slot_nr: pdata->regulator_deepsleep_slot[id]);
124 /*
125 * Configuring external control is not a major issue,
126 * just give warning.
127 */
128 if (ret < 0)
129 dev_warn(&pdev->dev,
130 "Failed to configure ext control %d\n", id);
131
132skip_ext_pwr_config:
133 config.dev = &pdev->dev;
134 config.init_data = pdata->reg_init_data[id];
135 config.driver_data = ri;
136 config.regmap = rc5t583->regmap;
137
138 rdev = devm_regulator_register(dev: &pdev->dev, regulator_desc: &ri->desc, config: &config);
139 if (IS_ERR(ptr: rdev)) {
140 dev_err(&pdev->dev, "Failed to register regulator %s\n",
141 ri->desc.name);
142 return PTR_ERR(ptr: rdev);
143 }
144 }
145 return 0;
146}
147
148static struct platform_driver rc5t583_regulator_driver = {
149 .driver = {
150 .name = "rc5t583-regulator",
151 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
152 },
153 .probe = rc5t583_regulator_probe,
154};
155
156static int __init rc5t583_regulator_init(void)
157{
158 return platform_driver_register(&rc5t583_regulator_driver);
159}
160subsys_initcall(rc5t583_regulator_init);
161
162static void __exit rc5t583_regulator_exit(void)
163{
164 platform_driver_unregister(&rc5t583_regulator_driver);
165}
166module_exit(rc5t583_regulator_exit);
167
168MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
169MODULE_DESCRIPTION("RC5T583 regulator driver");
170MODULE_ALIAS("platform:rc5t583-regulator");
171MODULE_LICENSE("GPL v2");
172

source code of linux/drivers/regulator/rc5t583-regulator.c