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_device.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         .list_voltage   = regulator_list_voltage_linear,
  24         .enable         = regulator_enable_regmap,
  25         .disable        = regulator_disable_regmap,
  26         .is_enabled     = regulator_is_enabled_regmap,
  27 };
  28
  29 static const struct regulator_desc stm32h7_booster_desc = {
  30         .name = "booster",
  31         .supply_name = "vdda",
  32         .n_voltages = 1,
  33         .type = REGULATOR_VOLTAGE,
  34         .min_uV = 3300000,
  35         .fixed_uV = 3300000,
  36         .ramp_delay = 66000, /* up to 50us to stabilize */
  37         .ops = &stm32h7_booster_ops,
  38         .enable_reg = STM32H7_SYSCFG_PMCR,
  39         .enable_mask = STM32H7_SYSCFG_BOOSTE_MASK,
  40         .owner = THIS_MODULE,
  41 };
  42
  43 static int stm32mp1_booster_enable(struct regulator_dev *rdev)
  44 {
  45         return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCSETR,
  46                             STM32MP1_SYSCFG_EN_BOOSTER_MASK);
  47 }
  48
  49 static int stm32mp1_booster_disable(struct regulator_dev *rdev)
  50 {
  51         return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCCLRR,
  52                             STM32MP1_SYSCFG_EN_BOOSTER_MASK);
  53 }
  54
  55 static const struct regulator_ops stm32mp1_booster_ops = {
  56         .list_voltage   = regulator_list_voltage_linear,
  57         .enable         = stm32mp1_booster_enable,
  58         .disable        = stm32mp1_booster_disable,
  59         .is_enabled     = regulator_is_enabled_regmap,
  60 };
  61
  62 static const struct regulator_desc stm32mp1_booster_desc = {
  63         .name = "booster",
  64         .supply_name = "vdda",
  65         .n_voltages = 1,
  66         .type = REGULATOR_VOLTAGE,
  67         .min_uV = 3300000,
  68         .fixed_uV = 3300000,
  69         .ramp_delay = 66000,
  70         .ops = &stm32mp1_booster_ops,
  71         .enable_reg = STM32MP1_SYSCFG_PMCSETR,
  72         .enable_mask = STM32MP1_SYSCFG_EN_BOOSTER_MASK,
  73         .owner = THIS_MODULE,
  74 };
  75
  76 static int stm32_booster_probe(struct platform_device *pdev)
  77 {
  78         struct device *dev = &pdev->dev;
  79         struct device_node *np = pdev->dev.of_node;
  80         struct regulator_config config = { };
  81         const struct regulator_desc *desc;
  82         struct regulator_dev *rdev;
  83         struct regmap *regmap;
  84         int ret;
  85
  86         regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
  87         if (IS_ERR(regmap))
  88                 return PTR_ERR(regmap);
  89
  90         desc = (const struct regulator_desc *)
  91                 of_match_device(dev->driver->of_match_table, dev)->data;
  92
  93         config.regmap = regmap;
  94         config.dev = dev;
  95         config.of_node = np;
  96         config.init_data = of_get_regulator_init_data(dev, np, desc);
  97
  98         rdev = devm_regulator_register(dev, desc, &config);
  99         if (IS_ERR(rdev)) {
 100                 ret = PTR_ERR(rdev);
 101                 dev_err(dev, "register failed with error %d\n", ret);
 102                 return ret;
 103         }
 104
 105         return 0;
 106 }
 107
 108 static const struct of_device_id stm32_booster_of_match[] = {
 109         {
 110                 .compatible = "st,stm32h7-booster",
 111                 .data = (void *)&stm32h7_booster_desc
 112         }, {
 113                 .compatible = "st,stm32mp1-booster",
 114                 .data = (void *)&stm32mp1_booster_desc
 115         }, {
 116         },
 117 };
 118 MODULE_DEVICE_TABLE(of, stm32_booster_of_match);
 119
 120 static struct platform_driver stm32_booster_driver = {
 121         .probe = stm32_booster_probe,
 122         .driver = {
 123                 .name  = "stm32-booster",
 124                 .of_match_table = of_match_ptr(stm32_booster_of_match),
 125         },
 126 };
 127 module_platform_driver(stm32_booster_driver);
 128
 129 MODULE_LICENSE("GPL v2");
 130 MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
 131 MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver");
 132 MODULE_ALIAS("platform:stm32-booster");