1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) STMicroelectronics 2019
3// Author(s): Fabrice Gasnier <fabrice.gasnier@st.com>.
4
5#include <linux/mfd/syscon.h>
6#include <linux/module.h>
7#include <linux/of.h>
8#include <linux/platform_device.h>
9#include <linux/regmap.h>
10#include <linux/regulator/driver.h>
11#include <linux/regulator/of_regulator.h>
12
13/* STM32H7 SYSCFG register */
14#define STM32H7_SYSCFG_PMCR 0x04
15#define STM32H7_SYSCFG_BOOSTE_MASK BIT(8)
16
17/* STM32MP1 SYSCFG has set and clear registers */
18#define STM32MP1_SYSCFG_PMCSETR 0x04
19#define STM32MP1_SYSCFG_PMCCLRR 0x44
20#define STM32MP1_SYSCFG_EN_BOOSTER_MASK BIT(8)
21
22static const struct regulator_ops stm32h7_booster_ops = {
23 .enable = regulator_enable_regmap,
24 .disable = regulator_disable_regmap,
25 .is_enabled = regulator_is_enabled_regmap,
26};
27
28static const struct regulator_desc stm32h7_booster_desc = {
29 .name = "booster",
30 .supply_name = "vdda",
31 .n_voltages = 1,
32 .type = REGULATOR_VOLTAGE,
33 .fixed_uV = 3300000,
34 .ramp_delay = 66000, /* up to 50us to stabilize */
35 .ops = &stm32h7_booster_ops,
36 .enable_reg = STM32H7_SYSCFG_PMCR,
37 .enable_mask = STM32H7_SYSCFG_BOOSTE_MASK,
38 .owner = THIS_MODULE,
39};
40
41static int stm32mp1_booster_enable(struct regulator_dev *rdev)
42{
43 return regmap_write(map: rdev->regmap, STM32MP1_SYSCFG_PMCSETR,
44 STM32MP1_SYSCFG_EN_BOOSTER_MASK);
45}
46
47static int stm32mp1_booster_disable(struct regulator_dev *rdev)
48{
49 return regmap_write(map: rdev->regmap, STM32MP1_SYSCFG_PMCCLRR,
50 STM32MP1_SYSCFG_EN_BOOSTER_MASK);
51}
52
53static const struct regulator_ops stm32mp1_booster_ops = {
54 .enable = stm32mp1_booster_enable,
55 .disable = stm32mp1_booster_disable,
56 .is_enabled = regulator_is_enabled_regmap,
57};
58
59static const struct regulator_desc stm32mp1_booster_desc = {
60 .name = "booster",
61 .supply_name = "vdda",
62 .n_voltages = 1,
63 .type = REGULATOR_VOLTAGE,
64 .fixed_uV = 3300000,
65 .ramp_delay = 66000,
66 .ops = &stm32mp1_booster_ops,
67 .enable_reg = STM32MP1_SYSCFG_PMCSETR,
68 .enable_mask = STM32MP1_SYSCFG_EN_BOOSTER_MASK,
69 .owner = THIS_MODULE,
70};
71
72static int stm32_booster_probe(struct platform_device *pdev)
73{
74 struct device *dev = &pdev->dev;
75 struct device_node *np = pdev->dev.of_node;
76 struct regulator_config config = { };
77 const struct regulator_desc *desc;
78 struct regulator_dev *rdev;
79 struct regmap *regmap;
80 int ret;
81
82 regmap = syscon_regmap_lookup_by_phandle(np, property: "st,syscfg");
83 if (IS_ERR(ptr: regmap))
84 return PTR_ERR(ptr: regmap);
85
86 desc = device_get_match_data(dev);
87
88 config.regmap = regmap;
89 config.dev = dev;
90 config.of_node = np;
91 config.init_data = of_get_regulator_init_data(dev, node: np, desc);
92
93 rdev = devm_regulator_register(dev, regulator_desc: desc, config: &config);
94 if (IS_ERR(ptr: rdev)) {
95 ret = PTR_ERR(ptr: rdev);
96 dev_err(dev, "register failed with error %d\n", ret);
97 return ret;
98 }
99
100 return 0;
101}
102
103static const struct of_device_id __maybe_unused stm32_booster_of_match[] = {
104 {
105 .compatible = "st,stm32h7-booster",
106 .data = (void *)&stm32h7_booster_desc
107 }, {
108 .compatible = "st,stm32mp1-booster",
109 .data = (void *)&stm32mp1_booster_desc
110 }, {
111 },
112};
113MODULE_DEVICE_TABLE(of, stm32_booster_of_match);
114
115static struct platform_driver stm32_booster_driver = {
116 .probe = stm32_booster_probe,
117 .driver = {
118 .name = "stm32-booster",
119 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
120 .of_match_table = of_match_ptr(stm32_booster_of_match),
121 },
122};
123module_platform_driver(stm32_booster_driver);
124
125MODULE_LICENSE("GPL v2");
126MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
127MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver");
128MODULE_ALIAS("platform:stm32-booster");
129

source code of linux/drivers/regulator/stm32-booster.c