1/*
2 * Regulator driver for LP87565 PMIC
3 *
4 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2.
9 */
10
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/regmap.h>
14
15#include <linux/mfd/lp87565.h>
16
17#define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
18 _delay, _lr, _cr) \
19 [_id] = { \
20 .desc = { \
21 .name = _name, \
22 .supply_name = _of "-in", \
23 .id = _id, \
24 .of_match = of_match_ptr(_of), \
25 .regulators_node = of_match_ptr("regulators"),\
26 .ops = &_ops, \
27 .n_voltages = _n, \
28 .type = REGULATOR_VOLTAGE, \
29 .owner = THIS_MODULE, \
30 .vsel_reg = _vr, \
31 .vsel_mask = _vm, \
32 .enable_reg = _er, \
33 .enable_mask = _em, \
34 .ramp_delay = _delay, \
35 .linear_ranges = _lr, \
36 .n_linear_ranges = ARRAY_SIZE(_lr), \
37 }, \
38 .ctrl2_reg = _cr, \
39 }
40
41struct lp87565_regulator {
42 struct regulator_desc desc;
43 unsigned int ctrl2_reg;
44};
45
46static const struct lp87565_regulator regulators[];
47
48static const struct regulator_linear_range buck0_1_2_3_ranges[] = {
49 REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
50 REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
51 REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
52};
53
54static const unsigned int lp87565_buck_ramp_delay[] = {
55 30000, 15000, 10000, 7500, 3800, 1900, 940, 470
56};
57
58/* LP87565 BUCK current limit */
59static const unsigned int lp87565_buck_uA[] = {
60 1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
61};
62
63static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
64 int ramp_delay)
65{
66 int id = rdev_get_id(rdev);
67 struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
68 unsigned int reg;
69 int ret;
70
71 if (ramp_delay <= 470)
72 reg = 7;
73 else if (ramp_delay <= 940)
74 reg = 6;
75 else if (ramp_delay <= 1900)
76 reg = 5;
77 else if (ramp_delay <= 3800)
78 reg = 4;
79 else if (ramp_delay <= 7500)
80 reg = 3;
81 else if (ramp_delay <= 10000)
82 reg = 2;
83 else if (ramp_delay <= 15000)
84 reg = 1;
85 else
86 reg = 0;
87
88 ret = regmap_update_bits(lp87565->regmap, regulators[id].ctrl2_reg,
89 LP87565_BUCK_CTRL_2_SLEW_RATE,
90 reg << __ffs(LP87565_BUCK_CTRL_2_SLEW_RATE));
91 if (ret) {
92 dev_err(lp87565->dev, "SLEW RATE write failed: %d\n", ret);
93 return ret;
94 }
95
96 rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];
97
98 /* Conservatively give a 15% margin */
99 rdev->constraints->ramp_delay =
100 rdev->constraints->ramp_delay * 85 / 100;
101
102 return 0;
103}
104
105static int lp87565_buck_set_current_limit(struct regulator_dev *rdev,
106 int min_uA, int max_uA)
107{
108 int id = rdev_get_id(rdev);
109 struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
110 int i;
111
112 for (i = ARRAY_SIZE(lp87565_buck_uA) - 1; i >= 0; i--) {
113 if (lp87565_buck_uA[i] >= min_uA &&
114 lp87565_buck_uA[i] <= max_uA)
115 return regmap_update_bits(lp87565->regmap,
116 regulators[id].ctrl2_reg,
117 LP87565_BUCK_CTRL_2_ILIM,
118 i << __ffs(LP87565_BUCK_CTRL_2_ILIM));
119 }
120
121 return -EINVAL;
122}
123
124static int lp87565_buck_get_current_limit(struct regulator_dev *rdev)
125{
126 int id = rdev_get_id(rdev);
127 struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
128 int ret;
129 unsigned int val;
130
131 ret = regmap_read(lp87565->regmap, regulators[id].ctrl2_reg, &val);
132 if (ret)
133 return ret;
134
135 val = (val & LP87565_BUCK_CTRL_2_ILIM) >>
136 __ffs(LP87565_BUCK_CTRL_2_ILIM);
137
138 return (val < ARRAY_SIZE(lp87565_buck_uA)) ?
139 lp87565_buck_uA[val] : -EINVAL;
140}
141
142/* Operations permitted on BUCK0, BUCK1 */
143static const struct regulator_ops lp87565_buck_ops = {
144 .is_enabled = regulator_is_enabled_regmap,
145 .enable = regulator_enable_regmap,
146 .disable = regulator_disable_regmap,
147 .get_voltage_sel = regulator_get_voltage_sel_regmap,
148 .set_voltage_sel = regulator_set_voltage_sel_regmap,
149 .list_voltage = regulator_list_voltage_linear_range,
150 .map_voltage = regulator_map_voltage_linear_range,
151 .set_voltage_time_sel = regulator_set_voltage_time_sel,
152 .set_ramp_delay = lp87565_buck_set_ramp_delay,
153 .set_current_limit = lp87565_buck_set_current_limit,
154 .get_current_limit = lp87565_buck_get_current_limit,
155};
156
157static const struct lp87565_regulator regulators[] = {
158 LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
159 256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
160 LP87565_REG_BUCK0_CTRL_1,
161 LP87565_BUCK_CTRL_1_EN, 3230,
162 buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
163 LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
164 256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
165 LP87565_REG_BUCK1_CTRL_1,
166 LP87565_BUCK_CTRL_1_EN, 3230,
167 buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
168 LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
169 256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
170 LP87565_REG_BUCK2_CTRL_1,
171 LP87565_BUCK_CTRL_1_EN, 3230,
172 buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
173 LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
174 256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
175 LP87565_REG_BUCK3_CTRL_1,
176 LP87565_BUCK_CTRL_1_EN, 3230,
177 buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
178 LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
179 256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
180 LP87565_REG_BUCK0_CTRL_1,
181 LP87565_BUCK_CTRL_1_EN |
182 LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
183 buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
184 LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
185 256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
186 LP87565_REG_BUCK2_CTRL_1,
187 LP87565_BUCK_CTRL_1_EN, 3230,
188 buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
189};
190
191static int lp87565_regulator_probe(struct platform_device *pdev)
192{
193 struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent);
194 struct regulator_config config = { };
195 struct regulator_dev *rdev;
196 int i, min_idx = LP87565_BUCK_1, max_idx = LP87565_BUCK_3;
197
198 platform_set_drvdata(pdev, lp87565);
199
200 config.dev = &pdev->dev;
201 config.dev->of_node = lp87565->dev->of_node;
202 config.driver_data = lp87565;
203 config.regmap = lp87565->regmap;
204
205 if (lp87565->dev_type == LP87565_DEVICE_TYPE_LP87565_Q1) {
206 min_idx = LP87565_BUCK_10;
207 max_idx = LP87565_BUCK_23;
208 }
209
210 for (i = min_idx; i <= max_idx; i++) {
211 rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
212 &config);
213 if (IS_ERR(rdev)) {
214 dev_err(lp87565->dev, "failed to register %s regulator\n",
215 pdev->name);
216 return PTR_ERR(rdev);
217 }
218 }
219
220 return 0;
221}
222
223static const struct platform_device_id lp87565_regulator_id_table[] = {
224 { "lp87565-regulator", },
225 { "lp87565-q1-regulator", },
226 { /* sentinel */ }
227};
228MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);
229
230static struct platform_driver lp87565_regulator_driver = {
231 .driver = {
232 .name = "lp87565-pmic",
233 },
234 .probe = lp87565_regulator_probe,
235 .id_table = lp87565_regulator_id_table,
236};
237module_platform_driver(lp87565_regulator_driver);
238
239MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
240MODULE_DESCRIPTION("LP87565 voltage regulator driver");
241MODULE_LICENSE("GPL v2");
242