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