1 files changed, 132 insertions, 0 deletions

diff --git a/drivers/regulator/stm32-booster.c b/drivers/regulator/stm32-booster.c
new file mode 100644
index 000000000000..2a897666c650
--- /dev/null
+++ b/drivers/regulator/stm32-booster.c
@@ -0,0 +1,132 @@
+// 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");