[PATCH 5/6] drivers: regulator: add MAX77659 regulator support

[Zeynep Arslanbenzer]

This patch adds regulator driver for MAX77659.

Signed-off-by: Nurettin Bolucu <Nurettin.Bolucu@xxxxxxxxxx>
Signed-off-by: Zeynep Arslanbenzer <Zeynep.Arslanbenzer@xxxxxxxxxx>
---
 MAINTAINERS                            |  1 +
 drivers/regulator/Kconfig              |  8 +++
 drivers/regulator/Makefile             |  1 +
 drivers/regulator/max77659-regulator.c | 98 ++++++++++++++++++++++++++
 4 files changed, 108 insertions(+)
 create mode 100644 drivers/regulator/max77659-regulator.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 5cb8fa452f2d..13c062a8cda2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12649,6 +12649,7 @@ F:	Documentation/devicetree/bindings/mfd/adi,max77659.yaml
 F:	Documentation/devicetree/bindings/power/supply/adi,max77659-charger.yaml
 F:	drivers/mfd/max77659.c
 F:	drivers/power/supply/max77659-charger.c
+F:	drivers/regulator/max77659-regulator.c
 F:	include/linux/mfd/max77659.h
 
 MAXIM MAX77714 PMIC MFD DRIVER
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 820c9a0788e5..4a9852c7050f 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -573,6 +573,14 @@ config REGULATOR_MAX77650
 	  Semiconductor. This device has a SIMO with three independent
 	  power rails and an LDO.
 
+config REGULATOR_MAX77659
+	tristate "Analog Devices MAX77659 Regulator"
+	depends on MFD_MAX77659
+	help
+	  Regulator driver for MAX77659 PMIC from Analog Devices.
+	  This driver supports an LDO regulator.
+	  Say Y here to enable the regulator driver.
+
 config REGULATOR_MAX8649
 	tristate "Maxim 8649 voltage regulator"
 	depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index b9f5eb35bf5f..a7e91b56fb3f 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
 obj-$(CONFIG_REGULATOR_MAX597X) += max597x-regulator.o
 obj-$(CONFIG_REGULATOR_MAX77620) += max77620-regulator.o
 obj-$(CONFIG_REGULATOR_MAX77650) += max77650-regulator.o
+obj-$(CONFIG_REGULATOR_MAX77659) += max77659-regulator.o
 obj-$(CONFIG_REGULATOR_MAX8649)	+= max8649.o
 obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o
 obj-$(CONFIG_REGULATOR_MAX8893) += max8893.o
diff --git a/drivers/regulator/max77659-regulator.c b/drivers/regulator/max77659-regulator.c
new file mode 100644
index 000000000000..03a565013851
--- /dev/null
+++ b/drivers/regulator/max77659-regulator.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/mfd/max77659.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define MAX77659_LDO_VOLT_REG_MAX 0x7F
+#define MAX77659_LDO_VOLT_N_RANGE 0x80
+#define MAX77659_LDO_VOLT_STEP 25000
+#define MAX77659_LDO_VOLT_BASE 500000
+
+#define MAX77659_REG_CNFG_LDO0_A 0x38
+#define MAX77659_REG_CNFG_LDO0_B 0x39
+
+#define MAX77659_BITS_CONFIG_LDO0_A_TV_LDO GENMASK(6, 0)
+#define MAX77659_BITS_CONFIG_LDO0_B_EN_LDO GENMASK(2, 0)
+
+/*
+ * 0.500 to 3.675V (25mV step)
+ */
+static const struct linear_range MAX77659_LDO_volts[] = {
+	REGULATOR_LINEAR_RANGE(MAX77659_LDO_VOLT_BASE, 0x00, MAX77659_LDO_VOLT_REG_MAX,
+			       MAX77659_LDO_VOLT_STEP),
+};
+
+static const struct regulator_ops max77659_LDO_ops = {
+	.list_voltage	 = regulator_list_voltage_linear_range,
+	.map_voltage	 = regulator_map_voltage_ascend,
+	.is_enabled	 = regulator_is_enabled_regmap,
+	.enable		 = regulator_enable_regmap,
+	.disable	 = regulator_disable_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+};
+
+static struct regulator_desc max77659_LDO_desc = {
+	.name		 = "LDO",
+	.id		 = 0,
+	.regulators_node = of_match_ptr("regulator"),
+	.ops		 = &max77659_LDO_ops,
+	.type		 = REGULATOR_VOLTAGE,
+	.owner		 = THIS_MODULE,
+	.n_linear_ranges = MAX77659_LDO_VOLT_N_RANGE,
+	.linear_ranges	 = MAX77659_LDO_volts,
+	.vsel_reg	 = MAX77659_REG_CNFG_LDO0_A,
+	.vsel_mask	 = MAX77659_BITS_CONFIG_LDO0_A_TV_LDO,
+	.enable_reg	 = MAX77659_REG_CNFG_LDO0_B,
+	.enable_mask	 = MAX77659_BITS_CONFIG_LDO0_B_EN_LDO,
+	.enable_val	 = 0x06,
+	.disable_val	 = 0x04,
+};
+
+static int max77659_regulator_probe(struct platform_device *pdev)
+{
+	struct regulator_dev *rdev;
+	struct regulator_config config = {};
+
+	config.dev = &pdev->dev;
+
+	rdev = devm_regulator_register(&pdev->dev, &max77659_LDO_desc, &config);
+
+	if (IS_ERR(rdev))
+		return dev_err_probe(&pdev->dev, PTR_ERR(rdev),
+				     "Failed to register regulator %s\n", max77659_LDO_desc.name);
+
+	return 0;
+}
+
+static const struct of_device_id max77659_regulator_of_id[] = {
+	{ .compatible = "adi,max77659-regulator" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, max77659_regulator_of_id);
+
+static const struct platform_device_id max77659_regulator_id[] = {
+	{ MAX77659_REGULATOR_NAME, 0, },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, max77659_regulator_id);
+
+static struct platform_driver max77659_regulator_driver = {
+	.driver = {
+		.name = MAX77659_REGULATOR_NAME,
+		.of_match_table = of_match_ptr(max77659_regulator_of_id),
+	},
+	.probe = max77659_regulator_probe,
+	.id_table = max77659_regulator_id,
+};
+
+module_platform_driver(max77659_regulator_driver);
+
+MODULE_DESCRIPTION("max77659 Regulator Driver");
+MODULE_AUTHOR("Nurettin.Bolucu@xxxxxxxxxx, Zeynep.Arslanbenzer@xxxxxxxxxx");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
-- 
2.25.1