1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Regulator driver for LP87565 PMIC
4  *
5  * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
6  */
7 
8 #include <linux/module.h>
9 #include <linux/platform_device.h>
10 #include <linux/regmap.h>
11 
12 #include <linux/mfd/lp87565.h>
13 
14 #define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm,		\
15 			  _er, _em, _ev, _delay, _lr, _cr)		\
16 	[_id] = {							\
17 		.desc = {						\
18 			.name			= _name,		\
19 			.supply_name		= _of "-in",		\
20 			.id			= _id,			\
21 			.of_match		= of_match_ptr(_of),	\
22 			.regulators_node	= of_match_ptr("regulators"),\
23 			.ops			= &_ops,		\
24 			.n_voltages		= _n,			\
25 			.type			= REGULATOR_VOLTAGE,	\
26 			.owner			= THIS_MODULE,		\
27 			.vsel_reg		= _vr,			\
28 			.vsel_mask		= _vm,			\
29 			.enable_reg		= _er,			\
30 			.enable_mask		= _em,			\
31 			.enable_val		= _ev,			\
32 			.ramp_delay		= _delay,		\
33 			.linear_ranges		= _lr,			\
34 			.n_linear_ranges	= ARRAY_SIZE(_lr),	\
35 			.curr_table = lp87565_buck_uA,			\
36 			.n_current_limits = ARRAY_SIZE(lp87565_buck_uA),\
37 			.csel_reg = (_cr),				\
38 			.csel_mask = LP87565_BUCK_CTRL_2_ILIM,		\
39 		},							\
40 		.ctrl2_reg = _cr,					\
41 	}
42 
43 struct lp87565_regulator {
44 	struct regulator_desc desc;
45 	unsigned int ctrl2_reg;
46 };
47 
48 static const struct lp87565_regulator regulators[];
49 
50 static const struct linear_range buck0_1_2_3_ranges[] = {
51 	REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
52 	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
53 	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
54 };
55 
56 static const unsigned int lp87565_buck_ramp_delay[] = {
57 	30000, 15000, 10000, 7500, 3800, 1900, 940, 470
58 };
59 
60 /* LP87565 BUCK current limit */
61 static const unsigned int lp87565_buck_uA[] = {
62 	1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
63 };
64 
65 static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
66 				       int ramp_delay)
67 {
68 	int id = rdev_get_id(rdev);
69 	unsigned int reg;
70 	int ret;
71 
72 	if (ramp_delay <= 470)
73 		reg = 7;
74 	else if (ramp_delay <= 940)
75 		reg = 6;
76 	else if (ramp_delay <= 1900)
77 		reg = 5;
78 	else if (ramp_delay <= 3800)
79 		reg = 4;
80 	else if (ramp_delay <= 7500)
81 		reg = 3;
82 	else if (ramp_delay <= 10000)
83 		reg = 2;
84 	else if (ramp_delay <= 15000)
85 		reg = 1;
86 	else
87 		reg = 0;
88 
89 	ret = regmap_update_bits(rdev->regmap, regulators[id].ctrl2_reg,
90 				 LP87565_BUCK_CTRL_2_SLEW_RATE,
91 				 reg << __ffs(LP87565_BUCK_CTRL_2_SLEW_RATE));
92 	if (ret) {
93 		dev_err(&rdev->dev, "SLEW RATE write failed: %d\n", ret);
94 		return ret;
95 	}
96 
97 	rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];
98 
99 	/* Conservatively give a 15% margin */
100 	rdev->constraints->ramp_delay =
101 				rdev->constraints->ramp_delay * 85 / 100;
102 
103 	return 0;
104 }
105 
106 /* Operations permitted on BUCKs */
107 static const struct regulator_ops lp87565_buck_ops = {
108 	.is_enabled		= regulator_is_enabled_regmap,
109 	.enable			= regulator_enable_regmap,
110 	.disable		= regulator_disable_regmap,
111 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
112 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
113 	.list_voltage		= regulator_list_voltage_linear_range,
114 	.map_voltage		= regulator_map_voltage_linear_range,
115 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
116 	.set_ramp_delay		= lp87565_buck_set_ramp_delay,
117 	.set_current_limit	= regulator_set_current_limit_regmap,
118 	.get_current_limit	= regulator_get_current_limit_regmap,
119 };
120 
121 static const struct lp87565_regulator regulators[] = {
122 	LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
123 			  256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
124 			  LP87565_REG_BUCK0_CTRL_1,
125 			  LP87565_BUCK_CTRL_1_EN |
126 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
127 			  LP87565_BUCK_CTRL_1_EN, 3230,
128 			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
129 	LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
130 			  256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
131 			  LP87565_REG_BUCK1_CTRL_1,
132 			  LP87565_BUCK_CTRL_1_EN |
133 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
134 			  LP87565_BUCK_CTRL_1_EN, 3230,
135 			  buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
136 	LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
137 			  256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
138 			  LP87565_REG_BUCK2_CTRL_1,
139 			  LP87565_BUCK_CTRL_1_EN |
140 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
141 			  LP87565_BUCK_CTRL_1_EN, 3230,
142 			  buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
143 	LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
144 			  256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
145 			  LP87565_REG_BUCK3_CTRL_1,
146 			  LP87565_BUCK_CTRL_1_EN |
147 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
148 			  LP87565_BUCK_CTRL_1_EN, 3230,
149 			  buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
150 	LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
151 			  256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
152 			  LP87565_REG_BUCK0_CTRL_1,
153 			  LP87565_BUCK_CTRL_1_EN |
154 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL |
155 			  LP87565_BUCK_CTRL_1_FPWM_MP_0_2,
156 			  LP87565_BUCK_CTRL_1_EN |
157 			  LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
158 			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
159 	LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
160 			  256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
161 			  LP87565_REG_BUCK2_CTRL_1,
162 			  LP87565_BUCK_CTRL_1_EN |
163 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
164 			  LP87565_BUCK_CTRL_1_EN, 3230,
165 			  buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
166 	LP87565_REGULATOR("BUCK3210", LP87565_BUCK_3210, "buck3210",
167 			  lp87565_buck_ops, 256, LP87565_REG_BUCK0_VOUT,
168 			  LP87565_BUCK_VSET, LP87565_REG_BUCK0_CTRL_1,
169 			  LP87565_BUCK_CTRL_1_EN |
170 			  LP87565_BUCK_CTRL_1_EN_PIN_CTRL |
171 			  LP87565_BUCK_CTRL_1_FPWM_MP_0_2,
172 			  LP87565_BUCK_CTRL_1_EN |
173 			  LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
174 			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
175 };
176 
177 static int lp87565_regulator_probe(struct platform_device *pdev)
178 {
179 	struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent);
180 	struct regulator_config config = { };
181 	struct regulator_dev *rdev;
182 	int i, min_idx, max_idx;
183 
184 	platform_set_drvdata(pdev, lp87565);
185 
186 	config.dev = &pdev->dev;
187 	config.dev->of_node = lp87565->dev->of_node;
188 	config.driver_data = lp87565;
189 	config.regmap = lp87565->regmap;
190 
191 	switch (lp87565->dev_type) {
192 	case LP87565_DEVICE_TYPE_LP87565_Q1:
193 		min_idx = LP87565_BUCK_10;
194 		max_idx = LP87565_BUCK_23;
195 		break;
196 	case LP87565_DEVICE_TYPE_LP87561_Q1:
197 		min_idx = LP87565_BUCK_3210;
198 		max_idx = LP87565_BUCK_3210;
199 		break;
200 	default:
201 		min_idx = LP87565_BUCK_0;
202 		max_idx = LP87565_BUCK_3;
203 		break;
204 	}
205 
206 	for (i = min_idx; i <= max_idx; i++) {
207 		rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
208 					       &config);
209 		if (IS_ERR(rdev)) {
210 			dev_err(lp87565->dev, "failed to register %s regulator\n",
211 				pdev->name);
212 			return PTR_ERR(rdev);
213 		}
214 	}
215 
216 	return 0;
217 }
218 
219 static const struct platform_device_id lp87565_regulator_id_table[] = {
220 	{ "lp87565-regulator", },
221 	{ "lp87565-q1-regulator", },
222 	{ /* sentinel */ }
223 };
224 MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);
225 
226 static struct platform_driver lp87565_regulator_driver = {
227 	.driver = {
228 		.name = "lp87565-pmic",
229 	},
230 	.probe = lp87565_regulator_probe,
231 	.id_table = lp87565_regulator_id_table,
232 };
233 module_platform_driver(lp87565_regulator_driver);
234 
235 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
236 MODULE_DESCRIPTION("LP87565 voltage regulator driver");
237 MODULE_LICENSE("GPL v2");
238