Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for regulators found in the SpacemiT P1 PMIC
4 *
5 * Copyright (C) 2025 by RISCstar Solutions Corporation. All rights reserved.
6 * Derived from code from SpacemiT.
7 * Copyright (c) 2023, SPACEMIT Co., Ltd
8 */
9
10#include <linux/array_size.h>
11#include <linux/bits.h>
12#include <linux/device.h>
13#include <linux/linear_range.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/platform_device.h>
17#include <linux/regulator/driver.h>
18
19#define MOD_NAME "spacemit-p1-regulator"
20
21enum p1_regulator_id {
22 P1_BUCK1,
23 P1_BUCK2,
24 P1_BUCK3,
25 P1_BUCK4,
26 P1_BUCK5,
27 P1_BUCK6,
28
29 P1_ALDO1,
30 P1_ALDO2,
31 P1_ALDO3,
32 P1_ALDO4,
33
34 P1_DLDO1,
35 P1_DLDO2,
36 P1_DLDO3,
37 P1_DLDO4,
38 P1_DLDO5,
39 P1_DLDO6,
40 P1_DLDO7,
41};
42
43static const struct regulator_ops p1_regulator_ops = {
44 .list_voltage = regulator_list_voltage_linear_range,
45 .get_voltage_sel = regulator_get_voltage_sel_regmap,
46 .set_voltage_sel = regulator_set_voltage_sel_regmap,
47 .set_voltage_time_sel = regulator_set_voltage_time_sel,
48 .enable = regulator_enable_regmap,
49 .disable = regulator_disable_regmap,
50 .is_enabled = regulator_is_enabled_regmap,
51};
52
53/* Selector value 255 can be used to disable the buck converter on sleep */
54static const struct linear_range p1_buck_ranges[] = {
55 REGULATOR_LINEAR_RANGE(500000, 0, 170, 5000),
56 REGULATOR_LINEAR_RANGE(1375000, 171, 254, 25000),
57};
58
59/* Selector value 0 can be used for suspend */
60static const struct linear_range p1_ldo_ranges[] = {
61 REGULATOR_LINEAR_RANGE(500000, 11, 127, 25000),
62};
63
64/* These define the voltage selector field for buck and LDO regulators */
65#define BUCK_MASK GENMASK(7, 0)
66#define LDO_MASK GENMASK(6, 0)
67
68#define P1_ID(_TYPE, _n) P1_ ## _TYPE ## _n
69#define P1_ENABLE_REG(_off, _n) ((_off) + 3 * ((_n) - 1))
70
71#define P1_REG_DESC(_TYPE, _type, _n, _s, _off, _mask, _nv, _ranges) \
72 { \
73 .name = #_type #_n, \
74 .supply_name = _s, \
75 .of_match = of_match_ptr(#_type #_n), \
76 .regulators_node = of_match_ptr("regulators"), \
77 .id = P1_ID(_TYPE, _n), \
78 .n_voltages = _nv, \
79 .ops = &p1_regulator_ops, \
80 .owner = THIS_MODULE, \
81 .linear_ranges = _ranges, \
82 .n_linear_ranges = ARRAY_SIZE(_ranges), \
83 .vsel_reg = P1_ENABLE_REG(_off, _n) + 1, \
84 .vsel_mask = _mask, \
85 .enable_reg = P1_ENABLE_REG(_off, _n), \
86 .enable_mask = BIT(0), \
87 }
88
89#define P1_BUCK_DESC(_n) \
90 P1_REG_DESC(BUCK, buck, _n, "vin" #_n, 0x47, BUCK_MASK, 255, p1_buck_ranges)
91
92#define P1_ALDO_DESC(_n) \
93 P1_REG_DESC(ALDO, aldo, _n, "aldoin", 0x5b, LDO_MASK, 128, p1_ldo_ranges)
94
95#define P1_DLDO1_DESC(_n) \
96 P1_REG_DESC(DLDO, dldo, _n, "dldoin1", 0x67, LDO_MASK, 128, p1_ldo_ranges)
97
98#define P1_DLDO2_DESC(_n) \
99 P1_REG_DESC(DLDO, dldo, _n, "dldoin2", 0x67, LDO_MASK, 128, p1_ldo_ranges)
100
101static const struct regulator_desc p1_regulator_desc[] = {
102 P1_BUCK_DESC(1),
103 P1_BUCK_DESC(2),
104 P1_BUCK_DESC(3),
105 P1_BUCK_DESC(4),
106 P1_BUCK_DESC(5),
107 P1_BUCK_DESC(6),
108
109 P1_ALDO_DESC(1),
110 P1_ALDO_DESC(2),
111 P1_ALDO_DESC(3),
112 P1_ALDO_DESC(4),
113
114 P1_DLDO1_DESC(1),
115 P1_DLDO1_DESC(2),
116 P1_DLDO1_DESC(3),
117 P1_DLDO1_DESC(4),
118 P1_DLDO2_DESC(5),
119 P1_DLDO2_DESC(6),
120 P1_DLDO2_DESC(7),
121};
122
123static int p1_regulator_probe(struct platform_device *pdev)
124{
125 struct regulator_config config = { };
126 struct device *dev = &pdev->dev;
127 u32 i;
128
129 /*
130 * The parent device (PMIC) owns the regmap. Since we don't
131 * provide one in the config structure, that one will be used.
132 */
133 config.dev = dev->parent;
134
135 for (i = 0; i < ARRAY_SIZE(p1_regulator_desc); i++) {
136 const struct regulator_desc *desc = &p1_regulator_desc[i];
137 struct regulator_dev *rdev;
138
139 rdev = devm_regulator_register(dev, desc, &config);
140 if (IS_ERR(rdev))
141 return dev_err_probe(dev, PTR_ERR(rdev),
142 "error registering regulator %s\n",
143 desc->name);
144 }
145
146 return 0;
147}
148
149static struct platform_driver p1_regulator_driver = {
150 .probe = p1_regulator_probe,
151 .driver = {
152 .name = MOD_NAME,
153 },
154};
155
156module_platform_driver(p1_regulator_driver);
157
158MODULE_DESCRIPTION("SpacemiT P1 regulator driver");
159MODULE_LICENSE("GPL");
160MODULE_ALIAS("platform:" MOD_NAME);