1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Regulator driver for LP873X PMIC
4 *
5 * Copyright (C) 2016 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/lp873x.h>
13
14#define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
15			 _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			.ramp_delay		= _delay,		\
32			.linear_ranges		= _lr,			\
33			.n_linear_ranges	= ARRAY_SIZE(_lr),	\
34			.curr_table	= lp873x_buck_uA,		\
35			.n_current_limits = ARRAY_SIZE(lp873x_buck_uA),	\
36			.csel_reg	= (_cr),			\
37			.csel_mask	= LP873X_BUCK0_CTRL_2_BUCK0_ILIM,\
38		},							\
39		.ctrl2_reg = _cr,					\
40	}
41
42struct lp873x_regulator {
43	struct regulator_desc desc;
44	unsigned int ctrl2_reg;
45};
46
47static const struct lp873x_regulator regulators[];
48
49static const struct linear_range buck0_buck1_ranges[] = {
50	REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
51	REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
52	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
53	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
54};
55
56static const struct linear_range ldo0_ldo1_ranges[] = {
57	REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
58};
59
60static const unsigned int lp873x_buck_ramp_delay[] = {
61	30000, 15000, 10000, 7500, 3800, 1900, 940, 470
62};
63
64/* LP873X BUCK current limit */
65static const unsigned int lp873x_buck_uA[] = {
66	1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
67};
68
69static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
70				      int ramp_delay)
71{
72	int id = rdev_get_id(rdev);
73	struct lp873x *lp873 = rdev_get_drvdata(rdev);
74	unsigned int reg;
75	int ret;
76
77	if (ramp_delay <= 470)
78		reg = 7;
79	else if (ramp_delay <= 940)
80		reg = 6;
81	else if (ramp_delay <= 1900)
82		reg = 5;
83	else if (ramp_delay <= 3800)
84		reg = 4;
85	else if (ramp_delay <= 7500)
86		reg = 3;
87	else if (ramp_delay <= 10000)
88		reg = 2;
89	else if (ramp_delay <= 15000)
90		reg = 1;
91	else
92		reg = 0;
93
94	ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
95				 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
96				 reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
97	if (ret) {
98		dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
99		return ret;
100	}
101
102	rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
103
104	return 0;
105}
106
107/* Operations permitted on BUCK0, BUCK1 */
108static const struct regulator_ops lp873x_buck01_ops = {
109	.is_enabled		= regulator_is_enabled_regmap,
110	.enable			= regulator_enable_regmap,
111	.disable		= regulator_disable_regmap,
112	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
113	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
114	.list_voltage		= regulator_list_voltage_linear_range,
115	.map_voltage		= regulator_map_voltage_linear_range,
116	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
117	.set_ramp_delay		= lp873x_buck_set_ramp_delay,
118	.set_current_limit	= regulator_set_current_limit_regmap,
119	.get_current_limit	= regulator_get_current_limit_regmap,
120};
121
122/* Operations permitted on LDO0 and LDO1 */
123static const struct regulator_ops lp873x_ldo01_ops = {
124	.is_enabled		= regulator_is_enabled_regmap,
125	.enable			= regulator_enable_regmap,
126	.disable		= regulator_disable_regmap,
127	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
128	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
129	.list_voltage		= regulator_list_voltage_linear_range,
130	.map_voltage		= regulator_map_voltage_linear_range,
131};
132
133static const struct lp873x_regulator regulators[] = {
134	LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
135			 256, LP873X_REG_BUCK0_VOUT,
136			 LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
137			 LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
138			 buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
139	LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
140			 256, LP873X_REG_BUCK1_VOUT,
141			 LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
142			 LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
143			 buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
144	LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
145			 LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
146			 LP873X_REG_LDO0_CTRL,
147			 LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
148	LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
149			 LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
150			 LP873X_REG_LDO1_CTRL,
151			 LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
152};
153
154static int lp873x_regulator_probe(struct platform_device *pdev)
155{
156	struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
157	struct regulator_config config = { };
158	struct regulator_dev *rdev;
159	int i;
160
161	platform_set_drvdata(pdev, lp873);
162
163	config.dev = &pdev->dev;
164	config.dev->of_node = lp873->dev->of_node;
165	config.driver_data = lp873;
166	config.regmap = lp873->regmap;
167
168	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
169		rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
170					       &config);
171		if (IS_ERR(rdev)) {
172			dev_err(lp873->dev, "failed to register %s regulator\n",
173				pdev->name);
174			return PTR_ERR(rdev);
175		}
176	}
177
178	return 0;
179}
180
181static const struct platform_device_id lp873x_regulator_id_table[] = {
182	{ "lp873x-regulator", },
183	{ /* sentinel */ }
184};
185MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
186
187static struct platform_driver lp873x_regulator_driver = {
188	.driver = {
189		.name = "lp873x-pmic",
190		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
191	},
192	.probe = lp873x_regulator_probe,
193	.id_table = lp873x_regulator_id_table,
194};
195module_platform_driver(lp873x_regulator_driver);
196
197MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
198MODULE_DESCRIPTION("LP873X voltage regulator driver");
199MODULE_ALIAS("platform:lp873x-pmic");
200MODULE_LICENSE("GPL v2");
201