1// SPDX-License-Identifier: GPL-2.0+
2//
3// mp5416.c  - regulator driver for mps mp5416
4//
5// Copyright 2020 Monolithic Power Systems, Inc
6//
7// Author: Saravanan Sekar <sravanhome@gmail.com>
8
9#include <linux/err.h>
10#include <linux/i2c.h>
11#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/platform_device.h>
15#include <linux/regmap.h>
16#include <linux/regulator/driver.h>
17
18#define MP5416_REG_CTL0			0x00
19#define MP5416_REG_CTL1			0x01
20#define MP5416_REG_CTL2			0x02
21#define MP5416_REG_ILIM			0x03
22#define MP5416_REG_BUCK1		0x04
23#define MP5416_REG_BUCK2		0x05
24#define MP5416_REG_BUCK3		0x06
25#define MP5416_REG_BUCK4		0x07
26#define MP5416_REG_LDO1			0x08
27#define MP5416_REG_LDO2			0x09
28#define MP5416_REG_LDO3			0x0a
29#define MP5416_REG_LDO4			0x0b
30
31#define MP5416_REGULATOR_EN		BIT(7)
32#define MP5416_MASK_VSET		0x7f
33#define MP5416_MASK_BUCK1_ILIM		0xc0
34#define MP5416_MASK_BUCK2_ILIM		0x0c
35#define MP5416_MASK_BUCK3_ILIM		0x30
36#define MP5416_MASK_BUCK4_ILIM		0x03
37#define MP5416_MASK_DVS_SLEWRATE	0xc0
38
39/* values in uV */
40#define MP5416_VOLT1_MIN		600000
41#define MP5416_VOLT1_MAX		2187500
42#define MP5416_VOLT1_STEP		12500
43#define MP5416_VOLT2_MIN		800000
44#define MP5416_VOLT2_MAX		3975000
45#define MP5416_VOLT2_STEP		25000
46
47#define MP5416_VOLT1_RANGE \
48	((MP5416_VOLT1_MAX - MP5416_VOLT1_MIN)/MP5416_VOLT1_STEP + 1)
49#define MP5416_VOLT2_RANGE \
50	((MP5416_VOLT2_MAX - MP5416_VOLT2_MIN)/MP5416_VOLT2_STEP + 1)
51
52#define MP5416BUCK(_name, _id, _ilim, _dreg, _dval, _vsel)		\
53	[MP5416_BUCK ## _id] = {					\
54		.id = MP5416_BUCK ## _id,				\
55		.name = _name,						\
56		.of_match = _name,					\
57		.regulators_node = "regulators",			\
58		.ops = &mp5416_buck_ops,				\
59		.min_uV = MP5416_VOLT ##_vsel## _MIN,			\
60		.uV_step = MP5416_VOLT ##_vsel## _STEP,			\
61		.n_voltages = MP5416_VOLT ##_vsel## _RANGE,		\
62		.curr_table = _ilim,					\
63		.n_current_limits = ARRAY_SIZE(_ilim),			\
64		.csel_reg = MP5416_REG_ILIM,				\
65		.csel_mask = MP5416_MASK_BUCK ## _id ##_ILIM,		\
66		.vsel_reg = MP5416_REG_BUCK ## _id,			\
67		.vsel_mask = MP5416_MASK_VSET,				\
68		.enable_reg = MP5416_REG_BUCK ## _id,			\
69		.enable_mask = MP5416_REGULATOR_EN,			\
70		.ramp_reg = MP5416_REG_CTL2,				\
71		.ramp_mask = MP5416_MASK_DVS_SLEWRATE,			\
72		.ramp_delay_table = mp5416_buck_ramp_table,		\
73		.n_ramp_values = ARRAY_SIZE(mp5416_buck_ramp_table),	\
74		.active_discharge_on	= _dval,			\
75		.active_discharge_reg	= _dreg,			\
76		.active_discharge_mask	= _dval,			\
77		.owner			= THIS_MODULE,			\
78	}
79
80#define MP5416LDO(_name, _id, _dval)					\
81	[MP5416_LDO ## _id] = {						\
82		.id = MP5416_LDO ## _id,				\
83		.name = _name,						\
84		.of_match = _name,					\
85		.regulators_node = "regulators",			\
86		.ops = &mp5416_ldo_ops,					\
87		.min_uV = MP5416_VOLT2_MIN,				\
88		.uV_step = MP5416_VOLT2_STEP,				\
89		.n_voltages = MP5416_VOLT2_RANGE,			\
90		.vsel_reg = MP5416_REG_LDO ##_id,			\
91		.vsel_mask = MP5416_MASK_VSET,				\
92		.enable_reg = MP5416_REG_LDO ##_id,			\
93		.enable_mask = MP5416_REGULATOR_EN,			\
94		.active_discharge_on	= _dval,			\
95		.active_discharge_reg	= MP5416_REG_CTL2,		\
96		.active_discharge_mask	= _dval,			\
97		.owner			= THIS_MODULE,			\
98	}
99
100enum mp5416_regulators {
101	MP5416_BUCK1,
102	MP5416_BUCK2,
103	MP5416_BUCK3,
104	MP5416_BUCK4,
105	MP5416_LDO1,
106	MP5416_LDO2,
107	MP5416_LDO3,
108	MP5416_LDO4,
109	MP5416_MAX_REGULATORS,
110};
111
112static const struct regmap_config mp5416_regmap_config = {
113	.reg_bits = 8,
114	.val_bits = 8,
115	.max_register = 0x0d,
116};
117
118/* Current limits array (in uA)
119 * ILIM1 & ILIM3
120 */
121static const unsigned int mp5416_I_limits1[] = {
122	3800000, 4600000, 5600000, 6800000
123};
124
125/* ILIM2 & ILIM4 */
126static const unsigned int mp5416_I_limits2[] = {
127	2200000, 3200000, 4200000, 5200000
128};
129
130/*
131 * DVS ramp rate BUCK1 to BUCK4
132 * 00: 32mV/us
133 * 01: 16mV/us
134 * 10: 8mV/us
135 * 11: 4mV/us
136 */
137static const unsigned int mp5416_buck_ramp_table[] = {
138	32000, 16000, 8000, 4000
139};
140
141static const struct regulator_ops mp5416_ldo_ops = {
142	.enable			= regulator_enable_regmap,
143	.disable		= regulator_disable_regmap,
144	.is_enabled		= regulator_is_enabled_regmap,
145	.list_voltage		= regulator_list_voltage_linear,
146	.map_voltage		= regulator_map_voltage_linear,
147	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
148	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
149	.set_active_discharge	= regulator_set_active_discharge_regmap,
150};
151
152static const struct regulator_ops mp5416_buck_ops = {
153	.enable			= regulator_enable_regmap,
154	.disable		= regulator_disable_regmap,
155	.is_enabled		= regulator_is_enabled_regmap,
156	.list_voltage		= regulator_list_voltage_linear,
157	.map_voltage		= regulator_map_voltage_linear,
158	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
159	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
160	.set_active_discharge	= regulator_set_active_discharge_regmap,
161	.get_current_limit	= regulator_get_current_limit_regmap,
162	.set_current_limit	= regulator_set_current_limit_regmap,
163	.set_ramp_delay		= regulator_set_ramp_delay_regmap,
164};
165
166static struct regulator_desc mp5416_regulators_desc[MP5416_MAX_REGULATORS] = {
167	MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1),
168	MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 2),
169	MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1),
170	MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 2),
171	MP5416LDO("ldo1", 1, BIT(4)),
172	MP5416LDO("ldo2", 2, BIT(3)),
173	MP5416LDO("ldo3", 3, BIT(2)),
174	MP5416LDO("ldo4", 4, BIT(1)),
175};
176
177static struct regulator_desc mp5496_regulators_desc[MP5416_MAX_REGULATORS] = {
178	MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1),
179	MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 1),
180	MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1),
181	MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 1),
182	MP5416LDO("ldo1", 1, BIT(4)),
183	MP5416LDO("ldo2", 2, BIT(3)),
184	MP5416LDO("ldo3", 3, BIT(2)),
185	MP5416LDO("ldo4", 4, BIT(1)),
186};
187
188static int mp5416_i2c_probe(struct i2c_client *client)
189{
190	struct device *dev = &client->dev;
191	struct regulator_config config = { NULL, };
192	static const struct regulator_desc *desc;
193	struct regulator_dev *rdev;
194	struct regmap *regmap;
195	int i;
196
197	regmap = devm_regmap_init_i2c(client, &mp5416_regmap_config);
198	if (IS_ERR(regmap)) {
199		dev_err(dev, "Failed to allocate regmap!\n");
200		return PTR_ERR(regmap);
201	}
202
203	desc = i2c_get_match_data(client);
204	if (!desc)
205		return -ENODEV;
206
207	config.dev = dev;
208	config.regmap = regmap;
209
210	for (i = 0; i < MP5416_MAX_REGULATORS; i++) {
211		rdev = devm_regulator_register(dev,
212					       &desc[i],
213					       &config);
214		if (IS_ERR(rdev)) {
215			dev_err(dev, "Failed to register regulator!\n");
216			return PTR_ERR(rdev);
217		}
218	}
219
220	return 0;
221}
222
223static const struct of_device_id mp5416_of_match[] = {
224	{ .compatible = "mps,mp5416", .data = &mp5416_regulators_desc },
225	{ .compatible = "mps,mp5496", .data = &mp5496_regulators_desc },
226	{}
227};
228MODULE_DEVICE_TABLE(of, mp5416_of_match);
229
230static const struct i2c_device_id mp5416_id[] = {
231	{ "mp5416", (kernel_ulong_t)&mp5416_regulators_desc },
232	{ "mp5496", (kernel_ulong_t)&mp5496_regulators_desc },
233	{}
234};
235MODULE_DEVICE_TABLE(i2c, mp5416_id);
236
237static struct i2c_driver mp5416_regulator_driver = {
238	.driver = {
239		.name = "mp5416",
240		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
241		.of_match_table = of_match_ptr(mp5416_of_match),
242	},
243	.probe = mp5416_i2c_probe,
244	.id_table = mp5416_id,
245};
246module_i2c_driver(mp5416_regulator_driver);
247
248MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
249MODULE_DESCRIPTION("MP5416 PMIC regulator driver");
250MODULE_LICENSE("GPL");
251