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Message-ID: <20220204155241.576342-3-vincent.whitchurch@axis.com>
Date: Fri, 4 Feb 2022 16:52:41 +0100
From: Vincent Whitchurch <vincent.whitchurch@...s.com>
To: <lgirdwood@...il.com>, <broonie@...nel.org>
CC: <kernel@...s.com>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
Vincent Whitchurch <vincent.whitchurch@...s.com>
Subject: [PATCH 2/2] regulator: Add support for TPS6286x
TI's TPS62864/TPS6286/TPS62868/TPS62869 are high-frequency synchronous
step-down converters controlled via I2C. There are differences in the
electrical characteristics and packaging between the variants, but the
register interfaces are identical.
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
---
drivers/regulator/Kconfig | 9 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/tps6286x-regulator.c | 159 +++++++++++++++++++++++++
3 files changed, 169 insertions(+)
create mode 100644 drivers/regulator/tps6286x-regulator.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 1c35fed20d34..49e26f187742 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1263,6 +1263,15 @@ config REGULATOR_TPS62360
high-frequency synchronous step down dc-dc converter optimized
for battery-powered portable applications.
+config REGULATOR_TPS6286X
+ tristate "TI TPS6286x Power Regulator"
+ depends on I2C && OF
+ select REGMAP_I2C
+ help
+ This driver supports TPS6236x voltage regulator chips. These are
+ high-frequency synchronous step-down converters with an I2C
+ interface.
+
config REGULATOR_TPS65023
tristate "TI TPS65023 Power regulators"
depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 2e1b087489fa..4b8794a73e17 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -149,6 +149,7 @@ 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
+obj-$(CONFIG_REGULATOR_TPS6286X) += tps6286x-regulator.o
obj-$(CONFIG_REGULATOR_TPS65023) += tps65023-regulator.o
obj-$(CONFIG_REGULATOR_TPS6507X) += tps6507x-regulator.o
obj-$(CONFIG_REGULATOR_TPS65086) += tps65086-regulator.o
diff --git a/drivers/regulator/tps6286x-regulator.c b/drivers/regulator/tps6286x-regulator.c
new file mode 100644
index 000000000000..e29deda30d75
--- /dev/null
+++ b/drivers/regulator/tps6286x-regulator.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright Axis Communications AB
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/driver.h>
+
+#include <dt-bindings/regulator/ti,tps62864.h>
+
+#define TPS6286X_VOUT1 0x01
+#define TPS6286X_VOUT1_VO1_SET GENMASK(7, 0)
+
+#define TPS6286X_CONTROL 0x03
+#define TPS6286X_CONTROL_FPWM BIT(4)
+#define TPS6286X_CONTROL_SWEN BIT(5)
+
+#define TPS6286X_MIN_MV 400
+#define TPS6286X_MAX_MV 1675
+#define TPS6286X_STEP_MV 5
+
+static const struct regmap_config tps6286x_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int tps6286x_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ unsigned int val;
+
+ switch (mode) {
+ case REGULATOR_MODE_NORMAL:
+ val = 0;
+ break;
+ case REGULATOR_MODE_FAST:
+ val = TPS6286X_CONTROL_FPWM;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(rdev->regmap, TPS6286X_CONTROL,
+ TPS6286X_CONTROL_FPWM, val);
+}
+
+static unsigned int tps6286x_get_mode(struct regulator_dev *rdev)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(rdev->regmap, TPS6286X_CONTROL, &val);
+ if (ret < 0)
+ return 0;
+
+ return (val & TPS6286X_CONTROL_FPWM) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
+}
+
+static const struct regulator_ops tps6286x_regulator_ops = {
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .set_mode = tps6286x_set_mode,
+ .get_mode = tps6286x_get_mode,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+};
+
+static unsigned int tps6286x_of_map_mode(unsigned int mode)
+{
+ switch (mode) {
+ case TPS62864_MODE_NORMAL:
+ return REGULATOR_MODE_NORMAL;
+ case TPS62864_MODE_FPWM:
+ return REGULATOR_MODE_FAST;
+ default:
+ return REGULATOR_MODE_INVALID;
+ }
+}
+
+static const struct regulator_desc tps6286x_reg = {
+ .name = "tps6286x",
+ .of_match = of_match_ptr("SW"),
+ .owner = THIS_MODULE,
+ .ops = &tps6286x_regulator_ops,
+ .of_map_mode = tps6286x_of_map_mode,
+ .regulators_node = of_match_ptr("regulators"),
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = ((TPS6286X_MAX_MV - TPS6286X_MIN_MV) / TPS6286X_STEP_MV) + 1,
+ .min_uV = TPS6286X_MIN_MV * 1000,
+ .uV_step = TPS6286X_STEP_MV * 1000,
+ .vsel_reg = TPS6286X_VOUT1,
+ .vsel_mask = TPS6286X_VOUT1_VO1_SET,
+ .enable_reg = TPS6286X_CONTROL,
+ .enable_mask = TPS6286X_CONTROL_SWEN,
+ .ramp_delay = 1000,
+ /* tDelay + tRamp, rounded up */
+ .enable_time = 3000,
+};
+
+static const struct of_device_id tps6286x_dt_ids[] = {
+ { .compatible = "ti,tps62864", },
+ { .compatible = "ti,tps62866", },
+ { .compatible = "ti,tps62868", },
+ { .compatible = "ti,tps62869", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tps6286x_dt_ids);
+
+static int tps6286x_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &i2c->dev;
+ struct regulator_config config = {};
+ struct regulator_dev *rdev;
+ struct regmap *regmap;
+
+ regmap = devm_regmap_init_i2c(i2c, &tps6286x_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ config.dev = &i2c->dev;
+ config.of_node = dev->of_node;
+ config.regmap = regmap;
+
+ rdev = devm_regulator_register(&i2c->dev, &tps6286x_reg, &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&i2c->dev, "Failed to register tps6286x regulator\n");
+ return PTR_ERR(rdev);
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id tps6286x_i2c_id[] = {
+ { "tps62864", 0 },
+ { "tps62866", 0 },
+ { "tps62868", 0 },
+ { "tps62869", 0 },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, tps6286x_i2c_id);
+
+static struct i2c_driver tps6286x_regulator_driver = {
+ .driver = {
+ .name = "tps6286x",
+ .of_match_table = of_match_ptr(tps6286x_dt_ids),
+ },
+ .probe = tps6286x_i2c_probe,
+ .id_table = tps6286x_i2c_id,
+};
+
+module_i2c_driver(tps6286x_regulator_driver);
+
+MODULE_LICENSE("GPL v2");
--
2.34.1
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