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Message-ID: <1676426457-1389-3-git-send-email-cy_huang@richtek.com>
Date: Wed, 15 Feb 2023 10:00:57 +0800
From: <cy_huang@...htek.com>
To: <broonie@...nel.org>, <robh+dt@...nel.org>,
<krzysztof.kozlowski+dt@...aro.org>
CC: <lgirdwood@...il.com>, <cy_huang@...htek.com>,
<u0084500@...il.com>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: [PATCH 2/2] regulator: Add support for Richtek RT5739 voltage regulator
From: ChiYuan Huang <cy_huang@...htek.com>
The RT5739 is a step-down switching voltage regulator that supports
output voltage ragne from 300mV to 1300mV with the wide input supply
voltage range from 2.5V to 5.5V.
Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
---
drivers/regulator/Kconfig | 13 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/rt5739.c | 290 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 304 insertions(+)
create mode 100644 drivers/regulator/rt5739.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 820c9a0..f7f992c 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1112,6 +1112,19 @@ config REGULATOR_RT5190A
buck converters, 1 LDO, mute AC OFF depop function, with the general
I2C control interface.
+config REGULATOR_RT5739
+ tristate "Rcihtek RT5739 Regulator"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ This adds support for voltage regulator in Richtek RT5739.
+ It's a step-down switching voltage regulator. Using a proprietary
+ architecture with synchronous rectification, it is capable of
+ delivering 3.5A continuously at over 80% efficiency.
+
+ This driver can also be built as a module. If so, the module
+ will be called rt5739.
+
config REGULATOR_RT5759
tristate "Richtek RT5759 Regulator"
depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index b9f5eb3..30a61fc 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -133,6 +133,7 @@ obj-$(CONFIG_REGULATOR_RT4831) += rt4831-regulator.o
obj-$(CONFIG_REGULATOR_RT5033) += rt5033-regulator.o
obj-$(CONFIG_REGULATOR_RT5120) += rt5120-regulator.o
obj-$(CONFIG_REGULATOR_RT5190A) += rt5190a-regulator.o
+obj-$(CONFIG_REGULATOR_RT5739) += rt5739.o
obj-$(CONFIG_REGULATOR_RT5759) += rt5759-regulator.o
obj-$(CONFIG_REGULATOR_RT6160) += rt6160-regulator.o
obj-$(CONFIG_REGULATOR_RT6190) += rt6190-regulator.o
diff --git a/drivers/regulator/rt5739.c b/drivers/regulator/rt5739.c
new file mode 100644
index 00000000..0a9e102
--- /dev/null
+++ b/drivers/regulator/rt5739.c
@@ -0,0 +1,290 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Device driver for RT5739 regulator
+ *
+ * Copyright (C) 2023 Richtek Technology Corp.
+ *
+ * Author: ChiYuan Huang <cy_huang@...htek.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#define RT5739_AUTO_MODE 0
+#define RT5739_FPWM_MODE 1
+
+#define RT5739_REG_NSEL0 0x00
+#define RT5739_REG_NSEL1 0x01
+#define RT5739_REG_CNTL1 0x02
+#define RT5739_REG_ID1 0x03
+#define RT5739_REG_CNTL2 0x06
+#define RT5739_REG_CNTL4 0x08
+
+#define RT5739_VSEL_MASK GENMASK(7, 0)
+#define RT5739_MODEVSEL1_MASK BIT(1)
+#define RT5739_MODEVSEL0_MASK BIT(0)
+#define RT5739_VID_MASK GENMASK(7, 5)
+#define RT5739_ACTD_MASK BIT(7)
+#define RT5739_ENVSEL1_MASK BIT(1)
+#define RT5739_ENVSEL0_MASK BIT(0)
+
+#define RT5739_VOLT_MINUV 300000
+#define RT5739_VOLT_MAXUV 1300000
+#define RT5739_VOLT_STPUV 5000
+#define RT5739_N_VOLTS 201
+#define RT5739_I2CRDY_TIMEUS 1000
+
+static int rt5739_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int mask, val;
+
+ if (desc->vsel_reg == RT5739_REG_NSEL0)
+ mask = RT5739_MODEVSEL0_MASK;
+ else
+ mask = RT5739_MODEVSEL1_MASK;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ val = mask;
+ break;
+ case REGULATOR_MODE_NORMAL:
+ val = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(regmap, RT5739_REG_CNTL1, mask, val);
+}
+
+static unsigned int rt5739_get_mode(struct regulator_dev *rdev)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int mask, val;
+ int ret;
+
+ if (desc->vsel_reg == RT5739_REG_NSEL0)
+ mask = RT5739_MODEVSEL0_MASK;
+ else
+ mask = RT5739_MODEVSEL1_MASK;
+
+ ret = regmap_read(regmap, RT5739_REG_CNTL1, &val);
+ if (ret)
+ return REGULATOR_MODE_INVALID;
+
+ if (val & mask)
+ return REGULATOR_MODE_FAST;
+
+ return REGULATOR_MODE_NORMAL;
+}
+
+static int rt5739_set_suspend_voltage(struct regulator_dev *rdev, int uV)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int reg, vsel;
+
+ if (uV < RT5739_VOLT_MINUV || uV > RT5739_VOLT_MAXUV)
+ return -EINVAL;
+
+ if (desc->vsel_reg == RT5739_REG_NSEL0)
+ reg = RT5739_REG_NSEL1;
+ else
+ reg = RT5739_REG_NSEL0;
+
+ vsel = (uV - RT5739_VOLT_MINUV) / RT5739_VOLT_STPUV;
+ return regmap_write(regmap, reg, vsel);
+}
+
+static int rt5739_set_suspend_enable(struct regulator_dev *rdev)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int mask;
+
+ if (desc->vsel_reg == RT5739_REG_NSEL0)
+ mask = RT5739_ENVSEL1_MASK;
+ else
+ mask = RT5739_ENVSEL0_MASK;
+
+ return regmap_update_bits(regmap, desc->enable_reg, mask, mask);
+}
+
+static int rt5739_set_suspend_disable(struct regulator_dev *rdev)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int mask;
+
+ if (desc->vsel_reg == RT5739_REG_NSEL0)
+ mask = RT5739_ENVSEL1_MASK;
+ else
+ mask = RT5739_ENVSEL0_MASK;
+
+ return regmap_update_bits(regmap, desc->enable_reg, mask, 0);
+}
+
+static int rt5739_set_suspend_mode(struct regulator_dev *rdev,
+ unsigned int mode)
+{
+ const struct regulator_desc *desc = rdev->desc;
+ struct regmap *regmap = rdev_get_regmap(rdev);
+ unsigned int mask, val;
+
+ if (desc->vsel_reg == RT5739_REG_NSEL0)
+ mask = RT5739_MODEVSEL1_MASK;
+ else
+ mask = RT5739_MODEVSEL0_MASK;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ val = mask;
+ break;
+ case REGULATOR_MODE_NORMAL:
+ val = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(regmap, RT5739_REG_CNTL1, mask, val);
+}
+
+static const struct regulator_ops rt5739_regulator_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .set_mode = rt5739_set_mode,
+ .get_mode = rt5739_get_mode,
+ .set_suspend_voltage = rt5739_set_suspend_voltage,
+ .set_suspend_enable = rt5739_set_suspend_enable,
+ .set_suspend_disable = rt5739_set_suspend_disable,
+ .set_suspend_mode = rt5739_set_suspend_mode,
+};
+
+static unsigned int rt5739_of_map_mode(unsigned int mode)
+{
+ switch (mode) {
+ case RT5739_AUTO_MODE:
+ return REGULATOR_MODE_NORMAL;
+ case RT5739_FPWM_MODE:
+ return REGULATOR_MODE_FAST;
+ default:
+ return REGULATOR_MODE_INVALID;
+ }
+}
+
+static void rt5739_init_regulator_desc(struct regulator_desc *desc,
+ bool vsel_active_high)
+{
+ /* Fixed */
+ desc->name = "rt5739-regulator";
+ desc->owner = THIS_MODULE;
+ desc->ops = &rt5739_regulator_ops;
+ desc->n_voltages = RT5739_N_VOLTS;
+ desc->min_uV = RT5739_VOLT_MINUV;
+ desc->uV_step = RT5739_VOLT_STPUV;
+ desc->vsel_mask = RT5739_VSEL_MASK;
+ desc->enable_reg = RT5739_REG_CNTL2;
+ desc->active_discharge_reg = RT5739_REG_CNTL1;
+ desc->active_discharge_mask = RT5739_ACTD_MASK;
+ desc->active_discharge_on = RT5739_ACTD_MASK;
+ desc->of_map_mode = rt5739_of_map_mode;
+
+ /* Assigned by vsel level */
+ if (vsel_active_high) {
+ desc->vsel_reg = RT5739_REG_NSEL1;
+ desc->enable_mask = RT5739_ENVSEL1_MASK;
+ } else {
+ desc->vsel_reg = RT5739_REG_NSEL0;
+ desc->enable_mask = RT5739_ENVSEL0_MASK;
+ }
+}
+
+static const struct regmap_config rt5739_regmap_config = {
+ .name = "rt5739",
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = RT5739_REG_CNTL4,
+};
+
+static int rt5739_probe(struct i2c_client *i2c)
+{
+ struct device *dev = &i2c->dev;
+ struct regulator_desc *desc;
+ struct regmap *regmap;
+ struct gpio_desc *enable_gpio;
+ struct regulator_config cfg = {};
+ struct regulator_dev *rdev;
+ bool vsel_acth;
+ unsigned int vid;
+ int ret;
+
+ desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+
+ enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
+ if (IS_ERR(enable_gpio))
+ return dev_err_probe(dev, PTR_ERR(enable_gpio), "Failed to get 'enable' gpio\n");
+ else if (enable_gpio)
+ usleep_range(RT5739_I2CRDY_TIMEUS, RT5739_I2CRDY_TIMEUS + 1000);
+
+ regmap = devm_regmap_init_i2c(i2c, &rt5739_regmap_config);
+ if (IS_ERR(regmap))
+ return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
+
+ ret = regmap_read(regmap, RT5739_REG_ID1, &vid);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to read VID\n");
+
+ /* RT5739: (VID & MASK) must be 0 */
+ if (vid & RT5739_VID_MASK)
+ return dev_err_probe(dev, -ENODEV, "Incorrect VID (0x%02x)\n", vid);
+
+ vsel_acth = device_property_read_bool(dev, "richtek,vsel-active-high");
+
+ rt5739_init_regulator_desc(desc, vsel_acth);
+
+ cfg.dev = dev;
+ cfg.of_node = dev_of_node(dev);
+ cfg.init_data = of_get_regulator_init_data(dev, dev_of_node(dev), desc);
+ rdev = devm_regulator_register(dev, desc, &cfg);
+ if (IS_ERR(rdev))
+ return dev_err_probe(dev, PTR_ERR(rdev), "Failed to register regulator\n");
+
+ return 0;
+}
+
+static const struct of_device_id rt5739_device_table[] = {
+ { .compatible = "richtek,rt5739" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rt5739_device_table);
+
+static struct i2c_driver rt5739_driver = {
+ .driver = {
+ .name = "rt5739",
+ .of_match_table = rt5739_device_table,
+ },
+ .probe_new = rt5739_probe,
+};
+module_i2c_driver(rt5739_driver);
+
+MODULE_AUTHOR("ChiYuan Huang <cy_huang@...htek.com>");
+MODULE_DESCRIPTION("Richtek RT5739 regulator driver");
+MODULE_LICENSE("GPL");
--
2.7.4
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