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 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 = { 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, "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