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Subject[PATCH v2 2/4] regulator: add support for MP8869 regulator
From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>

The MP8869 from Monolithic Power Systems is a single output DC/DC
converter. The voltage can be controlled via I2C.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
drivers/regulator/Kconfig | 7 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/mp886x.c | 230 +++++++++++++++++++++++++++++++++++++
3 files changed, 238 insertions(+)
create mode 100644 drivers/regulator/mp886x.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 64a39f34ef37..f4b72cb098ef 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -635,6 +635,13 @@ config REGULATOR_MP8859
Say M here if you want to include support for the regulator as a
module. The module will be named "mp8859".

+config REGULATOR_MP886X
+ tristate "MPS MP8869 regulator driver"
+ depends on I2C && (OF || COMPILE_TEST)
+ select REGMAP_I2C
+ help
+ This driver supports the MP8869 voltage regulator.
+
config REGULATOR_MPQ7920
tristate "Monolithic MPQ7920 PMIC"
depends on I2C && OF
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index bc69d6481646..6610ee001d9a 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -80,6 +80,7 @@ obj-$(CONFIG_REGULATOR_MC13XXX_CORE) += mc13xxx-regulator-core.o
obj-$(CONFIG_REGULATOR_MCP16502) += mcp16502.o
obj-$(CONFIG_REGULATOR_MP5416) += mp5416.o
obj-$(CONFIG_REGULATOR_MP8859) += mp8859.o
+obj-$(CONFIG_REGULATOR_MP886X) += mp886x.o
obj-$(CONFIG_REGULATOR_MPQ7920) += mpq7920.o
obj-$(CONFIG_REGULATOR_MT6311) += mt6311-regulator.o
obj-$(CONFIG_REGULATOR_MT6323) += mt6323-regulator.o
diff --git a/drivers/regulator/mp886x.c b/drivers/regulator/mp886x.c
new file mode 100644
index 000000000000..f77321a449ca
--- /dev/null
+++ b/drivers/regulator/mp886x.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// MP8869 regulator driver
+//
+// Copyright (C) 2020 Synaptics Incorporated
+//
+// Author: Jisheng Zhang <jszhang@kernel.org>
+
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define MP886X_VSEL 0x00
+#define MP886X_V_BOOT (1 << 7)
+#define MP886X_SYSCNTLREG1 0x01
+#define MP886X_MODE (1 << 0)
+#define MP886X_GO (1 << 6)
+#define MP886X_EN (1 << 7)
+
+struct mp886x_device_info {
+ struct device *dev;
+ struct regulator_desc desc;
+ struct regulator_init_data *regulator;
+ struct gpio_desc *en_gpio;
+ u32 r[2];
+ unsigned int sel;
+};
+
+static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
+ MP886X_MODE, MP886X_MODE);
+ break;
+ case REGULATOR_MODE_NORMAL:
+ regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
+ MP886X_MODE, 0);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
+{
+ u32 val;
+ int ret;
+
+ ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
+ if (ret < 0)
+ return ret;
+ if (val & MP886X_MODE)
+ return REGULATOR_MODE_FAST;
+ else
+ return REGULATOR_MODE_NORMAL;
+}
+
+static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
+{
+ int ret;
+
+ ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
+ MP886X_GO, MP886X_GO);
+ if (ret < 0)
+ return ret;
+
+ sel <<= ffs(rdev->desc->vsel_mask) - 1;
+ return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
+ MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
+}
+
+static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
+{
+ u32 tmp = uv * r1 / r2;
+
+ return uv + tmp;
+}
+
+static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct mp886x_device_info *di = rdev_get_drvdata(rdev);
+ int ret, uv;
+ unsigned int val;
+ bool fbloop;
+
+ ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
+ if (ret)
+ return ret;
+
+ fbloop = val & MP886X_V_BOOT;
+ if (fbloop) {
+ uv = rdev->desc->min_uV;
+ uv = mp8869_scale(uv, di->r[0], di->r[1]);
+ return regulator_map_voltage_linear(rdev, uv, uv);
+ }
+
+ val &= rdev->desc->vsel_mask;
+ val >>= ffs(rdev->desc->vsel_mask) - 1;
+
+ return val;
+}
+
+static const struct regulator_ops mp8869_regulator_ops = {
+ .set_voltage_sel = mp8869_set_voltage_sel,
+ .get_voltage_sel = mp8869_get_voltage_sel,
+ .set_voltage_time_sel = regulator_set_voltage_time_sel,
+ .map_voltage = regulator_map_voltage_linear,
+ .list_voltage = regulator_list_voltage_linear,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_mode = mp886x_set_mode,
+ .get_mode = mp886x_get_mode,
+};
+
+static int mp886x_regulator_register(struct mp886x_device_info *di,
+ struct regulator_config *config)
+{
+ struct regulator_desc *rdesc = &di->desc;
+ struct regulator_dev *rdev;
+
+ rdesc->name = "mp886x-reg";
+ rdesc->supply_name = "vin";
+ rdesc->ops = of_device_get_match_data(di->dev);
+ rdesc->type = REGULATOR_VOLTAGE;
+ rdesc->n_voltages = 128;
+ rdesc->enable_reg = MP886X_SYSCNTLREG1;
+ rdesc->enable_mask = MP886X_EN;
+ rdesc->min_uV = 600000;
+ rdesc->uV_step = 10000;
+ rdesc->vsel_reg = MP886X_VSEL;
+ rdesc->vsel_mask = 0x3f;
+ rdesc->owner = THIS_MODULE;
+
+ rdev = devm_regulator_register(di->dev, &di->desc, config);
+ if (IS_ERR(rdev))
+ return PTR_ERR(rdev);
+ di->sel = rdesc->ops->get_voltage_sel(rdev);
+ return 0;
+}
+
+static const struct regmap_config mp886x_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int mp886x_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct device_node *np = dev->of_node;
+ struct mp886x_device_info *di;
+ struct regulator_config config = { };
+ struct regmap *regmap;
+ int ret;
+
+ di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL);
+ if (!di)
+ return -ENOMEM;
+
+ di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
+ if (!di->regulator) {
+ dev_err(dev, "Platform data not found!\n");
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32_array(np, "mps,fb-voltage-divider",
+ di->r, 2);
+ if (ret)
+ return ret;
+
+ di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
+ if (IS_ERR(di->en_gpio))
+ return PTR_ERR(di->en_gpio);
+
+ di->dev = dev;
+
+ regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(dev, "Failed to allocate regmap!\n");
+ return PTR_ERR(regmap);
+ }
+ i2c_set_clientdata(client, di);
+
+ config.dev = di->dev;
+ config.init_data = di->regulator;
+ config.regmap = regmap;
+ config.driver_data = di;
+ config.of_node = np;
+
+ ret = mp886x_regulator_register(di, &config);
+ if (ret < 0)
+ dev_err(dev, "Failed to register regulator!\n");
+ return ret;
+}
+
+static const struct of_device_id mp886x_dt_ids[] = {
+ {
+ .compatible = "mps,mp8869",
+ .data = &mp8869_regulator_ops
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, mp886x_dt_ids);
+
+static const struct i2c_device_id mp886x_id[] = {
+ { "mp886x", },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, mp886x_id);
+
+static struct i2c_driver mp886x_regulator_driver = {
+ .driver = {
+ .name = "mp886x-regulator",
+ .of_match_table = of_match_ptr(mp886x_dt_ids),
+ },
+ .probe = mp886x_i2c_probe,
+ .id_table = mp886x_id,
+};
+module_i2c_driver(mp886x_regulator_driver);
+
+MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
+MODULE_DESCRIPTION("MP886x regulator driver");
+MODULE_LICENSE("GPL v2");
--
2.24.0

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