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1// SPDX-License-Identifier: GPL-2.02// Copyright (C) STMicroelectronics 20193// 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 0x0415#define STM32H7_SYSCFG_BOOSTE_MASK BIT(8)16 17/* STM32MP1 SYSCFG has set and clear registers */18#define STM32MP1_SYSCFG_PMCSETR 0x0419#define STM32MP1_SYSCFG_PMCCLRR 0x4420#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(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(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, "st,syscfg");83 if (IS_ERR(regmap))84 return PTR_ERR(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, np, desc);92 93 rdev = devm_regulator_register(dev, desc, &config);94 if (IS_ERR(rdev)) {95 ret = PTR_ERR(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_desc107 }, {108 .compatible = "st,stm32mp1-booster",109 .data = (void *)&stm32mp1_booster_desc110 }, {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