drivers/regulator/stm32-booster.c

   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.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 = 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
 103 static const struct of_device_id __maybe_unused stm32_booster_of_match[] = {
 104         {
 105                 .compatible = "st,stm32h7-booster",
 106                 .data = (void *)&stm32h7_booster_desc
 107         }, {
 108                 .compatible = "st,stm32mp1-booster",
 109                 .data = (void *)&stm32mp1_booster_desc
 110         }, {
 111         },
 112 };
 113 MODULE_DEVICE_TABLE(of, stm32_booster_of_match);
 114
 115 static 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 };
 123 module_platform_driver(stm32_booster_driver);
 124
 125 MODULE_LICENSE("GPL v2");
 126 MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
 127 MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver");
 128 MODULE_ALIAS("platform:stm32-booster");