tjh.dev
Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2//
3// Device driver for regulators in Hi6421V530 IC
4//
5// Copyright (c) <2017> HiSilicon Technologies Co., Ltd.
6// http://www.hisilicon.com
7// Copyright (c) <2017> Linaro Ltd.
8// https://www.linaro.org
9//
10// Author: Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>
11// Guodong Xu <guodong.xu@linaro.org>
12
13#include <linux/mfd/hi6421-pmic.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/platform_device.h>
17#include <linux/regmap.h>
18#include <linux/regulator/driver.h>
19
20/*
21 * struct hi6421v530_regulator_info - hi6421v530 regulator information
22 * @desc: regulator description
23 * @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
24 */
25struct hi6421v530_regulator_info {
26 struct regulator_desc rdesc;
27 u8 mode_mask;
28};
29
30/* HI6421v530 regulators */
31enum hi6421v530_regulator_id {
32 HI6421V530_LDO3,
33 HI6421V530_LDO9,
34 HI6421V530_LDO11,
35 HI6421V530_LDO15,
36 HI6421V530_LDO16,
37};
38
39static const unsigned int ldo_3_voltages[] = {
40 1800000, 1825000, 1850000, 1875000,
41 1900000, 1925000, 1950000, 1975000,
42 2000000, 2025000, 2050000, 2075000,
43 2100000, 2125000, 2150000, 2200000,
44};
45
46static const unsigned int ldo_9_11_voltages[] = {
47 1750000, 1800000, 1825000, 2800000,
48 2850000, 2950000, 3000000, 3300000,
49};
50
51static const unsigned int ldo_15_16_voltages[] = {
52 1750000, 1800000, 2400000, 2600000,
53 2700000, 2850000, 2950000, 3000000,
54};
55
56static const struct regulator_ops hi6421v530_ldo_ops;
57
58#define HI6421V530_LDO_ENABLE_TIME (350)
59
60/*
61 * _id - LDO id name string
62 * v_table - voltage table
63 * vreg - voltage select register
64 * vmask - voltage select mask
65 * ereg - enable register
66 * emask - enable mask
67 * odelay - off/on delay time in uS
68 * ecomask - eco mode mask
69 */
70#define HI6421V530_LDO(_ID, v_table, vreg, vmask, ereg, emask, \
71 odelay, ecomask) { \
72 .rdesc = { \
73 .name = #_ID, \
74 .of_match = of_match_ptr(#_ID), \
75 .regulators_node = of_match_ptr("regulators"), \
76 .ops = &hi6421v530_ldo_ops, \
77 .type = REGULATOR_VOLTAGE, \
78 .id = HI6421V530_##_ID, \
79 .owner = THIS_MODULE, \
80 .n_voltages = ARRAY_SIZE(v_table), \
81 .volt_table = v_table, \
82 .vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
83 .vsel_mask = vmask, \
84 .enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
85 .enable_mask = emask, \
86 .enable_time = HI6421V530_LDO_ENABLE_TIME, \
87 .off_on_delay = odelay, \
88 }, \
89 .mode_mask = ecomask, \
90}
91
92/* HI6421V530 regulator information */
93
94static const struct hi6421v530_regulator_info hi6421v530_regulator_info[] = {
95 HI6421V530_LDO(LDO3, ldo_3_voltages, 0x061, 0xf, 0x060, 0x2,
96 20000, 0x6),
97 HI6421V530_LDO(LDO9, ldo_9_11_voltages, 0x06b, 0x7, 0x06a, 0x2,
98 40000, 0x6),
99 HI6421V530_LDO(LDO11, ldo_9_11_voltages, 0x06f, 0x7, 0x06e, 0x2,
100 40000, 0x6),
101 HI6421V530_LDO(LDO15, ldo_15_16_voltages, 0x077, 0x7, 0x076, 0x2,
102 40000, 0x6),
103 HI6421V530_LDO(LDO16, ldo_15_16_voltages, 0x079, 0x7, 0x078, 0x2,
104 40000, 0x6),
105};
106
107static unsigned int hi6421v530_regulator_ldo_get_mode(
108 struct regulator_dev *rdev)
109{
110 const struct hi6421v530_regulator_info *info;
111 unsigned int reg_val;
112
113 info = container_of(rdev->desc, struct hi6421v530_regulator_info, rdesc);
114 regmap_read(rdev->regmap, rdev->desc->enable_reg, ®_val);
115
116 if (reg_val & (info->mode_mask))
117 return REGULATOR_MODE_IDLE;
118
119 return REGULATOR_MODE_NORMAL;
120}
121
122static int hi6421v530_regulator_ldo_set_mode(struct regulator_dev *rdev,
123 unsigned int mode)
124{
125 const struct hi6421v530_regulator_info *info;
126 unsigned int new_mode;
127
128 info = container_of(rdev->desc, struct hi6421v530_regulator_info, rdesc);
129 switch (mode) {
130 case REGULATOR_MODE_NORMAL:
131 new_mode = 0;
132 break;
133 case REGULATOR_MODE_IDLE:
134 new_mode = info->mode_mask;
135 break;
136 default:
137 return -EINVAL;
138 }
139
140 regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
141 info->mode_mask, new_mode);
142
143 return 0;
144}
145
146
147static const struct regulator_ops hi6421v530_ldo_ops = {
148 .is_enabled = regulator_is_enabled_regmap,
149 .enable = regulator_enable_regmap,
150 .disable = regulator_disable_regmap,
151 .list_voltage = regulator_list_voltage_table,
152 .map_voltage = regulator_map_voltage_ascend,
153 .get_voltage_sel = regulator_get_voltage_sel_regmap,
154 .set_voltage_sel = regulator_set_voltage_sel_regmap,
155 .get_mode = hi6421v530_regulator_ldo_get_mode,
156 .set_mode = hi6421v530_regulator_ldo_set_mode,
157};
158
159static int hi6421v530_regulator_probe(struct platform_device *pdev)
160{
161 struct hi6421_pmic *pmic;
162 struct regulator_dev *rdev;
163 struct regulator_config config = { };
164 unsigned int i;
165
166 pmic = dev_get_drvdata(pdev->dev.parent);
167 if (!pmic) {
168 dev_err(&pdev->dev, "no pmic in the regulator parent node\n");
169 return -ENODEV;
170 }
171
172 for (i = 0; i < ARRAY_SIZE(hi6421v530_regulator_info); i++) {
173 config.dev = pdev->dev.parent;
174 config.regmap = pmic->regmap;
175
176 rdev = devm_regulator_register(&pdev->dev,
177 &hi6421v530_regulator_info[i].rdesc,
178 &config);
179 if (IS_ERR(rdev)) {
180 dev_err(&pdev->dev, "failed to register regulator %s\n",
181 hi6421v530_regulator_info[i].rdesc.name);
182 return PTR_ERR(rdev);
183 }
184 }
185 return 0;
186}
187
188static const struct platform_device_id hi6421v530_regulator_table[] = {
189 { .name = "hi6421v530-regulator" },
190 {},
191};
192MODULE_DEVICE_TABLE(platform, hi6421v530_regulator_table);
193
194static struct platform_driver hi6421v530_regulator_driver = {
195 .id_table = hi6421v530_regulator_table,
196 .driver = {
197 .name = "hi6421v530-regulator",
198 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
199 },
200 .probe = hi6421v530_regulator_probe,
201};
202module_platform_driver(hi6421v530_regulator_driver);
203
204MODULE_AUTHOR("Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>");
205MODULE_DESCRIPTION("Hi6421v530 regulator driver");
206MODULE_LICENSE("GPL v2");