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Date: Thu, 2 Jul 2020 17:14:38 +0800
From: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Rob Herring <robh+dt@...nel.org>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH 2/2] regulator: add support for SY8827N regulator
The SY8827N from Silergy Corp is a single output DC/DC converter. The
voltage can be controlled via I2C.
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
---
drivers/regulator/Kconfig | 7 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/sy8827n.c | 185 ++++++++++++++++++++++++++++++++++++
3 files changed, 193 insertions(+)
create mode 100644 drivers/regulator/sy8827n.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index edb1c4f8b496..0167dd46c7e4 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -989,6 +989,13 @@ config REGULATOR_SY8824X
help
This driver supports SY8824C single output regulator.
+config REGULATOR_SY8827N
+ tristate "Silergy SY8827N regulator"
+ depends on I2C && (OF || COMPILE_TEST)
+ select REGMAP_I2C
+ help
+ This driver supports SY8827N single output regulator.
+
config REGULATOR_TPS51632
tristate "TI TPS51632 Power Regulator"
depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index e8f163371071..0c32c5001561 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -120,6 +120,7 @@ obj-$(CONFIG_REGULATOR_STPMIC1) += stpmic1_regulator.o
obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
obj-$(CONFIG_REGULATOR_SY8106A) += sy8106a-regulator.o
obj-$(CONFIG_REGULATOR_SY8824X) += sy8824x.o
+obj-$(CONFIG_REGULATOR_SY8827N) += sy8827n.o
obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o
obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o
obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o
diff --git a/drivers/regulator/sy8827n.c b/drivers/regulator/sy8827n.c
new file mode 100644
index 000000000000..b207217f74d8
--- /dev/null
+++ b/drivers/regulator/sy8827n.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// SY8827N regulator driver
+//
+// Copyright (C) 2020 Synaptics Incorporated
+//
+// Author: Jisheng Zhang <jszhang@...nel.org>
+
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define SY8827N_VSEL0 0
+#define SY8827N_BUCK_EN (1 << 7)
+#define SY8827N_MODE (1 << 6)
+#define SY8827N_VSEL1 1
+#define SY8827N_CTRL 2
+
+#define SY8827N_NVOLTAGES 64
+#define SY8827N_VSELMIN 600000
+#define SY8827N_VSELSTEP 12500
+
+struct sy8827n_device_info {
+ struct device *dev;
+ struct regulator_desc desc;
+ struct regulator_init_data *regulator;
+ struct gpio_desc *en_gpio;
+ unsigned int vsel_reg;
+};
+
+static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ regmap_update_bits(rdev->regmap, di->vsel_reg,
+ SY8827N_MODE, SY8827N_MODE);
+ break;
+ case REGULATOR_MODE_NORMAL:
+ regmap_update_bits(rdev->regmap, di->vsel_reg,
+ SY8827N_MODE, 0);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
+{
+ struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
+ u32 val;
+ int ret = 0;
+
+ ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
+ if (ret < 0)
+ return ret;
+ if (val & SY8827N_MODE)
+ return REGULATOR_MODE_FAST;
+ else
+ return REGULATOR_MODE_NORMAL;
+}
+
+static const struct regulator_ops sy8827n_regulator_ops = {
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .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 = sy8827n_set_mode,
+ .get_mode = sy8827n_get_mode,
+};
+
+static int sy8827n_regulator_register(struct sy8827n_device_info *di,
+ struct regulator_config *config)
+{
+ struct regulator_desc *rdesc = &di->desc;
+ struct regulator_dev *rdev;
+
+ rdesc->name = "sy8827n-reg";
+ rdesc->supply_name = "vin";
+ rdesc->ops = &sy8827n_regulator_ops;
+ rdesc->type = REGULATOR_VOLTAGE;
+ rdesc->n_voltages = SY8827N_NVOLTAGES;
+ rdesc->enable_reg = di->vsel_reg;
+ rdesc->enable_mask = SY8827N_BUCK_EN;
+ rdesc->min_uV = SY8827N_VSELMIN;
+ rdesc->uV_step = SY8827N_VSELSTEP;
+ rdesc->vsel_reg = di->vsel_reg;
+ rdesc->vsel_mask = rdesc->n_voltages - 1;
+ rdesc->owner = THIS_MODULE;
+
+ rdev = devm_regulator_register(di->dev, &di->desc, config);
+ return PTR_ERR_OR_ZERO(rdev);
+}
+
+static const struct regmap_config sy8827n_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int sy8827n_i2c_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct device_node *np = dev->of_node;
+ struct sy8827n_device_info *di;
+ struct regulator_config config = { };
+ struct regmap *regmap;
+ int ret;
+
+ di = devm_kzalloc(dev, sizeof(struct sy8827n_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;
+ }
+
+ di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
+ if (IS_ERR(di->en_gpio))
+ return PTR_ERR(di->en_gpio);
+
+ if (of_property_read_bool(np, "silergy,vsel-state-high"))
+ di->vsel_reg = SY8827N_VSEL1;
+ else
+ di->vsel_reg = SY8827N_VSEL0;
+
+ di->dev = dev;
+
+ regmap = devm_regmap_init_i2c(client, &sy8827n_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 = sy8827n_regulator_register(di, &config);
+ if (ret < 0)
+ dev_err(dev, "Failed to register regulator!\n");
+ return ret;
+}
+
+static const struct of_device_id sy8827n_dt_ids[] = {
+ {
+ .compatible = "silergy,sy8827n",
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);
+
+static const struct i2c_device_id sy8827n_id[] = {
+ { "sy8827n", },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, sy8827n_id);
+
+static struct i2c_driver sy8827n_regulator_driver = {
+ .driver = {
+ .name = "sy8827n-regulator",
+ .of_match_table = of_match_ptr(sy8827n_dt_ids),
+ },
+ .probe_new = sy8827n_i2c_probe,
+ .id_table = sy8827n_id,
+};
+module_i2c_driver(sy8827n_regulator_driver);
+
+MODULE_AUTHOR("Jisheng Zhang <jszhang@...nel.org>");
+MODULE_DESCRIPTION("SY8827N regulator driver");
+MODULE_LICENSE("GPL v2");
--
2.27.0
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