Quelle  stm32-booster.c   Sprache: C

// 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.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 = {
 .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,
 .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 = {
 .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,
 .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 = device_get_match_data(dev);

 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 __maybe_unused 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",
  .probe_type = PROBE_PREFER_ASYNCHRONOUS,
  .of_match_table = of_match_ptr(stm32_booster_of_match),
 },
};
module_platform_driver(stm32_booster_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Fabrice Gasnier ");
MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver");
MODULE_ALIAS("platform:stm32-booster");