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Date: Mon, 21 Aug 2023 19:28:21 +0300
From: Gokhan Celik <gokhan.celik@...log.com>
To: <outreachy@...ts.linux.dev>
CC: Gokhan Celik <gokhan.celik@...log.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Gokhan Celik <Gokhan.Celik@...log.com>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH 1/2] drivers: regulator: Add MAX77503 regulator driver
Add MAX77503 buck converter driver.
Signed-off-by: Gokhan Celik <gokhan.celik@...log.com>
---
drivers/regulator/Kconfig | 10 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/max77503-regulator.c | 137 +++++++++++++++++++++++++
3 files changed, 148 insertions(+)
create mode 100644 drivers/regulator/max77503-regulator.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 823f8e6e4801..dbd2053774e9 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -556,6 +556,16 @@ config REGULATOR_MAX597X
The MAX5970/5978 is a smart switch with no output regulation, but
fault protection and voltage and current monitoring capabilities.
+config REGULATOR_MAX77503
+ tristate "Analog Devices MAX77503 Regulator"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ This driver controls a Analog Devices MAX77503 14V input, 1.5A
+ high-efficiency buck converter via I2C bus.
+ Say M here if you want to include support for the regulator as a
+ module.
+
config REGULATOR_MAX77541
tristate "Analog Devices MAX77541/77540 Regulator"
depends on MFD_MAX77541
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 15e0d614ff66..b5b724699b51 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_REGULATOR_LTC3676) += ltc3676.o
obj-$(CONFIG_REGULATOR_MAX14577) += max14577-regulator.o
obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
obj-$(CONFIG_REGULATOR_MAX597X) += max597x-regulator.o
+obj-$(CONFIG_REGULATOR_MAX77503) += max77503-regulator.o
obj-$(CONFIG_REGULATOR_MAX77541) += max77541-regulator.o
obj-$(CONFIG_REGULATOR_MAX77620) += max77620-regulator.o
obj-$(CONFIG_REGULATOR_MAX77650) += max77650-regulator.o
diff --git a/drivers/regulator/max77503-regulator.c b/drivers/regulator/max77503-regulator.c
new file mode 100644
index 000000000000..4a6ba4dd2acd
--- /dev/null
+++ b/drivers/regulator/max77503-regulator.c
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2023 Analog Devices, Inc.
+ * ADI regulator driver for MAX77503.
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/util_macros.h>
+
+#define MAX77503_REG_CFG 0x00
+#define MAX77503_REG_VOUT 0x01
+
+#define MAX77503_BIT_EN BIT(0)
+#define MAX77503_BIT_CURR_LIM BIT(3)
+#define MAX77503_BIT_ADEN BIT(6)
+
+#define MAX77503_BITS_SOFT_START GENMASK(5, 4)
+#define MAX77503_BITS_MX_VOUT GENMASK(7, 0)
+
+#define MAX77503_AD_ENABLED 0x1
+#define MAX77503_AD_DISABLED 0x0
+
+struct max77503_dev {
+ struct device *dev;
+ struct device_node *of_node;
+ struct regulator_desc desc;
+ struct regulator_dev *rdev;
+ struct regmap *regmap;
+};
+
+static const struct regmap_config max77503_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0x2,
+};
+
+static const struct regulator_ops max77503_buck_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,
+ .get_current_limit = regulator_get_current_limit_regmap,
+ .set_current_limit = regulator_set_current_limit_regmap,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .set_soft_start = regulator_set_soft_start_regmap,
+};
+
+static const struct linear_range max77503_buck_ranges[] = {
+ REGULATOR_LINEAR_RANGE(800000, 0x00, 0x54, 50000)
+};
+
+static const unsigned int max77503_current_limit_table[] = {
+ 500000, 2000000
+};
+
+static const struct regulator_desc max77503_regulators_desc = {
+ .name = "max77503",
+ .enable_reg = MAX77503_REG_CFG,
+ .enable_mask = MAX77503_BIT_EN,
+ .ops = &max77503_buck_ops,
+ .type = REGULATOR_VOLTAGE,
+ .linear_ranges = max77503_buck_ranges,
+ .n_linear_ranges = ARRAY_SIZE(max77503_buck_ranges),
+ .vsel_reg = MAX77503_REG_VOUT,
+ .vsel_mask = MAX77503_BITS_MX_VOUT,
+ .soft_start_reg = MAX77503_REG_CFG,
+ .soft_start_mask = MAX77503_BITS_SOFT_START,
+ .active_discharge_reg = MAX77503_REG_CFG,
+ .active_discharge_mask = MAX77503_BIT_ADEN,
+ .active_discharge_off = MAX77503_AD_DISABLED,
+ .active_discharge_on = MAX77503_AD_ENABLED,
+ .csel_reg = MAX77503_REG_CFG,
+ .csel_mask = MAX77503_BIT_CURR_LIM,
+ .curr_table = max77503_current_limit_table,
+ .n_current_limits = ARRAY_SIZE(max77503_current_limit_table),
+ .owner = THIS_MODULE,
+};
+
+static int max77503_regulator_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct regulator_config config = {};
+ struct regulator_dev *rdev;
+
+ config.dev = dev;
+ config.of_node = dev->of_node;
+ config.regmap = devm_regmap_init_i2c(client, &max77503_regmap_config);
+ if (IS_ERR(config.regmap)) {
+ dev_err(dev, "Failed to init regmap");
+ return PTR_ERR(config.regmap);
+ }
+
+ rdev = devm_regulator_register(dev, &max77503_regulators_desc, &config);
+ if (IS_ERR(rdev)) {
+ dev_err(dev, "Failed to register regulator MAX77503");
+ return PTR_ERR(rdev);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id of_max77503_match_tbl[] = {
+ { .compatible = "adi,max77503", },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, of_max77503_match_tbl);
+
+static const struct i2c_device_id max77503_regulator_id[] = {
+ {"max77503"},
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, max77503_regulator_id);
+
+static struct i2c_driver max77503_regulator_driver = {
+ .driver = {
+ .name = "max77503",
+ .of_match_table = of_max77503_match_tbl
+ },
+ .probe = max77503_regulator_probe,
+ .id_table = max77503_regulator_id,
+};
+
+module_i2c_driver(max77503_regulator_driver);
+
+MODULE_AUTHOR("Gokhan Celik <Gokhan.Celik@...log.com>");
+MODULE_DESCRIPTION("MAX77503 regulator driver");
+MODULE_LICENSE("GPL");
--
2.34.1
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