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 | |
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 | |
41 | static 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 | |
47 | static 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 | |
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 | |
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, 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 | |
103 | static 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 | }; |
113 | MODULE_DEVICE_TABLE(of, stm32_booster_of_match); |
114 | |
115 | static 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 | }; |
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" ); |
129 | |