1 /*
2 * Regulator driver for LP873X PMIC
3 *
4 * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether expressed or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License version 2 for more details.
14 */
15
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/regmap.h>
19
20 #include <linux/mfd/lp873x.h>
21
22 #define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
23 _delay, _lr, _cr) \
24 [_id] = { \
25 .desc = { \
26 .name = _name, \
27 .supply_name = _of "-in", \
28 .id = _id, \
29 .of_match = of_match_ptr(_of), \
30 .regulators_node = of_match_ptr("regulators"),\
31 .ops = &_ops, \
32 .n_voltages = _n, \
33 .type = REGULATOR_VOLTAGE, \
34 .owner = THIS_MODULE, \
35 .vsel_reg = _vr, \
36 .vsel_mask = _vm, \
37 .enable_reg = _er, \
38 .enable_mask = _em, \
39 .ramp_delay = _delay, \
40 .linear_ranges = _lr, \
41 .n_linear_ranges = ARRAY_SIZE(_lr), \
42 .curr_table = lp873x_buck_uA, \
43 .n_current_limits = ARRAY_SIZE(lp873x_buck_uA), \
44 .csel_reg = (_cr), \
45 .csel_mask = LP873X_BUCK0_CTRL_2_BUCK0_ILIM,\
46 }, \
47 .ctrl2_reg = _cr, \
48 }
49
50 struct lp873x_regulator {
51 struct regulator_desc desc;
52 unsigned int ctrl2_reg;
53 };
54
55 static const struct lp873x_regulator regulators[];
56
57 static const struct linear_range buck0_buck1_ranges[] = {
58 REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
59 REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
60 REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
61 REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
62 };
63
64 static const struct linear_range ldo0_ldo1_ranges[] = {
65 REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
66 };
67
68 static const unsigned int lp873x_buck_ramp_delay[] = {
69 30000, 15000, 10000, 7500, 3800, 1900, 940, 470
70 };
71
72 /* LP873X BUCK current limit */
73 static const unsigned int lp873x_buck_uA[] = {
74 1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
75 };
76
lp873x_buck_set_ramp_delay(struct regulator_dev * rdev,int ramp_delay)77 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
78 int ramp_delay)
79 {
80 int id = rdev_get_id(rdev);
81 struct lp873x *lp873 = rdev_get_drvdata(rdev);
82 unsigned int reg;
83 int ret;
84
85 if (ramp_delay <= 470)
86 reg = 7;
87 else if (ramp_delay <= 940)
88 reg = 6;
89 else if (ramp_delay <= 1900)
90 reg = 5;
91 else if (ramp_delay <= 3800)
92 reg = 4;
93 else if (ramp_delay <= 7500)
94 reg = 3;
95 else if (ramp_delay <= 10000)
96 reg = 2;
97 else if (ramp_delay <= 15000)
98 reg = 1;
99 else
100 reg = 0;
101
102 ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
103 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
104 reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
105 if (ret) {
106 dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
107 return ret;
108 }
109
110 rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
111
112 return 0;
113 }
114
115 /* Operations permitted on BUCK0, BUCK1 */
116 static const struct regulator_ops lp873x_buck01_ops = {
117 .is_enabled = regulator_is_enabled_regmap,
118 .enable = regulator_enable_regmap,
119 .disable = regulator_disable_regmap,
120 .get_voltage_sel = regulator_get_voltage_sel_regmap,
121 .set_voltage_sel = regulator_set_voltage_sel_regmap,
122 .list_voltage = regulator_list_voltage_linear_range,
123 .map_voltage = regulator_map_voltage_linear_range,
124 .set_voltage_time_sel = regulator_set_voltage_time_sel,
125 .set_ramp_delay = lp873x_buck_set_ramp_delay,
126 .set_current_limit = regulator_set_current_limit_regmap,
127 .get_current_limit = regulator_get_current_limit_regmap,
128 };
129
130 /* Operations permitted on LDO0 and LDO1 */
131 static const struct regulator_ops lp873x_ldo01_ops = {
132 .is_enabled = regulator_is_enabled_regmap,
133 .enable = regulator_enable_regmap,
134 .disable = regulator_disable_regmap,
135 .get_voltage_sel = regulator_get_voltage_sel_regmap,
136 .set_voltage_sel = regulator_set_voltage_sel_regmap,
137 .list_voltage = regulator_list_voltage_linear_range,
138 .map_voltage = regulator_map_voltage_linear_range,
139 };
140
141 static const struct lp873x_regulator regulators[] = {
142 LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
143 256, LP873X_REG_BUCK0_VOUT,
144 LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
145 LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
146 buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
147 LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
148 256, LP873X_REG_BUCK1_VOUT,
149 LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
150 LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
151 buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
152 LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
153 LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
154 LP873X_REG_LDO0_CTRL,
155 LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
156 LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
157 LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
158 LP873X_REG_LDO1_CTRL,
159 LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
160 };
161
lp873x_regulator_probe(struct platform_device * pdev)162 static int lp873x_regulator_probe(struct platform_device *pdev)
163 {
164 struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
165 struct regulator_config config = { };
166 struct regulator_dev *rdev;
167 int i;
168
169 platform_set_drvdata(pdev, lp873);
170
171 config.dev = &pdev->dev;
172 config.dev->of_node = lp873->dev->of_node;
173 config.driver_data = lp873;
174 config.regmap = lp873->regmap;
175
176 for (i = 0; i < ARRAY_SIZE(regulators); i++) {
177 rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc,
178 &config);
179 if (IS_ERR(rdev)) {
180 dev_err(lp873->dev, "failed to register %s regulator\n",
181 pdev->name);
182 return PTR_ERR(rdev);
183 }
184 }
185
186 return 0;
187 }
188
189 static const struct platform_device_id lp873x_regulator_id_table[] = {
190 { "lp873x-regulator", },
191 { /* sentinel */ }
192 };
193 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
194
195 static struct platform_driver lp873x_regulator_driver = {
196 .driver = {
197 .name = "lp873x-pmic",
198 },
199 .probe = lp873x_regulator_probe,
200 .id_table = lp873x_regulator_id_table,
201 };
202 module_platform_driver(lp873x_regulator_driver);
203
204 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
205 MODULE_DESCRIPTION("LP873X voltage regulator driver");
206 MODULE_ALIAS("platform:lp873x-pmic");
207 MODULE_LICENSE("GPL v2");
208