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_device.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
22 static 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
28 static 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
stm32mp1_booster_enable(struct regulator_dev * rdev)41 static int stm32mp1_booster_enable(struct regulator_dev *rdev)
42 {
43 return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCSETR,
44 STM32MP1_SYSCFG_EN_BOOSTER_MASK);
45 }
46
stm32mp1_booster_disable(struct regulator_dev * rdev)47 static int stm32mp1_booster_disable(struct regulator_dev *rdev)
48 {
49 return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCCLRR,
50 STM32MP1_SYSCFG_EN_BOOSTER_MASK);
51 }
52
53 static 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
59 static 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
stm32_booster_probe(struct platform_device * pdev)72 static 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, "st,syscfg");
83 if (IS_ERR(regmap))
84 return PTR_ERR(regmap);
85
86 desc = (const struct regulator_desc *)
87 of_match_device(dev->driver->of_match_table, dev)->data;
88
89 config.regmap = regmap;
90 config.dev = dev;
91 config.of_node = np;
92 config.init_data = of_get_regulator_init_data(dev, np, desc);
93
94 rdev = devm_regulator_register(dev, desc, &config);
95 if (IS_ERR(rdev)) {
96 ret = PTR_ERR(rdev);
97 dev_err(dev, "register failed with error %d\n", ret);
98 return ret;
99 }
100
101 return 0;
102 }
103
104 static const struct of_device_id __maybe_unused stm32_booster_of_match[] = {
105 {
106 .compatible = "st,stm32h7-booster",
107 .data = (void *)&stm32h7_booster_desc
108 }, {
109 .compatible = "st,stm32mp1-booster",
110 .data = (void *)&stm32mp1_booster_desc
111 }, {
112 },
113 };
114 MODULE_DEVICE_TABLE(of, stm32_booster_of_match);
115
116 static struct platform_driver stm32_booster_driver = {
117 .probe = stm32_booster_probe,
118 .driver = {
119 .name = "stm32-booster",
120 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
121 .of_match_table = of_match_ptr(stm32_booster_of_match),
122 },
123 };
124 module_platform_driver(stm32_booster_driver);
125
126 MODULE_LICENSE("GPL v2");
127 MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
128 MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver");
129 MODULE_ALIAS("platform:stm32-booster");
130