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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 = { | |
4e210fbe FG |
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, | |
4e210fbe FG |
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 | ||
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 | ||
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 = { | |
4e210fbe FG |
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, | |
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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 | ||
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 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 | .of_match_table = of_match_ptr(stm32_booster_of_match), | |
121 | }, | |
122 | }; | |
123 | module_platform_driver(stm32_booster_driver); | |
124 | ||
125 | MODULE_LICENSE("GPL v2"); | |
126 | MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>"); | |
127 | MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver"); | |
128 | MODULE_ALIAS("platform:stm32-booster"); |