// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) STMicroelectronics 2019
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// Author(s): Fabrice Gasnier <fabrice.gasnier@st.com>.
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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/* STM32H7 SYSCFG register */
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#define STM32H7_SYSCFG_PMCR 0x04
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#define STM32H7_SYSCFG_BOOSTE_MASK BIT(8)
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/* STM32MP1 SYSCFG has set and clear registers */
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#define STM32MP1_SYSCFG_PMCSETR 0x04
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#define STM32MP1_SYSCFG_PMCCLRR 0x44
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#define STM32MP1_SYSCFG_EN_BOOSTER_MASK BIT(8)
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static const struct regulator_ops stm32h7_booster_ops = {
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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};
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static const struct regulator_desc stm32h7_booster_desc = {
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.name = "booster",
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.supply_name = "vdda",
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.n_voltages = 1,
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.type = REGULATOR_VOLTAGE,
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.fixed_uV = 3300000,
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.ramp_delay = 66000, /* up to 50us to stabilize */
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.ops = &stm32h7_booster_ops,
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.enable_reg = STM32H7_SYSCFG_PMCR,
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.enable_mask = STM32H7_SYSCFG_BOOSTE_MASK,
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.owner = THIS_MODULE,
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};
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static int stm32mp1_booster_enable(struct regulator_dev *rdev)
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{
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return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCSETR,
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STM32MP1_SYSCFG_EN_BOOSTER_MASK);
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}
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static int stm32mp1_booster_disable(struct regulator_dev *rdev)
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{
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return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCCLRR,
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STM32MP1_SYSCFG_EN_BOOSTER_MASK);
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}
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static const struct regulator_ops stm32mp1_booster_ops = {
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.enable = stm32mp1_booster_enable,
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.disable = stm32mp1_booster_disable,
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.is_enabled = regulator_is_enabled_regmap,
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};
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static const struct regulator_desc stm32mp1_booster_desc = {
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.name = "booster",
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.supply_name = "vdda",
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.n_voltages = 1,
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.type = REGULATOR_VOLTAGE,
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.fixed_uV = 3300000,
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.ramp_delay = 66000,
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.ops = &stm32mp1_booster_ops,
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.enable_reg = STM32MP1_SYSCFG_PMCSETR,
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.enable_mask = STM32MP1_SYSCFG_EN_BOOSTER_MASK,
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.owner = THIS_MODULE,
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};
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static int stm32_booster_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = pdev->dev.of_node;
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struct regulator_config config = { };
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const struct regulator_desc *desc;
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struct regulator_dev *rdev;
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struct regmap *regmap;
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int ret;
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regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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desc = (const struct regulator_desc *)
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of_match_device(dev->driver->of_match_table, dev)->data;
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config.regmap = regmap;
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config.dev = dev;
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config.of_node = np;
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config.init_data = of_get_regulator_init_data(dev, np, desc);
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rdev = devm_regulator_register(dev, desc, &config);
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if (IS_ERR(rdev)) {
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ret = PTR_ERR(rdev);
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dev_err(dev, "register failed with error %d\n", ret);
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return ret;
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}
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return 0;
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}
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static const struct of_device_id __maybe_unused stm32_booster_of_match[] = {
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{
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.compatible = "st,stm32h7-booster",
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.data = (void *)&stm32h7_booster_desc
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}, {
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.compatible = "st,stm32mp1-booster",
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.data = (void *)&stm32mp1_booster_desc
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}, {
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},
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};
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MODULE_DEVICE_TABLE(of, stm32_booster_of_match);
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static struct platform_driver stm32_booster_driver = {
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.probe = stm32_booster_probe,
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.driver = {
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.name = "stm32-booster",
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.of_match_table = of_match_ptr(stm32_booster_of_match),
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},
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};
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module_platform_driver(stm32_booster_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver");
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MODULE_ALIAS("platform:stm32-booster");
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