regulator: add support for the stm32-booster

Add support for the 3.3V booster regulator embedded in stm32h7 and stm32mp1
devices, that can be used to supply ADC analog input switches.

This regulator is supplied by vdda. It's controlled by using SYSCFG:
- STM32H7 has a unique register to set/clear the booster enable bit
- STM32MP1 has separate set and clear registers to configure it.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

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");