regulator: Add support for DA9121 regulator

Add support for the Dialog Semiconductor DA9121, a single-channel
dual-phase buck converter controlled via I2C.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Link: https://lore.kernel.org/r/20201103100021.19603-3-vincent.whitchurch@axis.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 020a00d..005a603 100644 (file)
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -303,6 +303,18 @@ config REGULATOR_DA9063
          This driver can also be built as a module. If so, the module
          will be called da9063-regulator.
 
+config REGULATOR_DA9121
+       tristate "Dialog Semiconductor DA9121 regulator"
+       depends on I2C && OF
+       select REGMAP_I2C
+       help
+         Say y here to support for the Dialog Semiconductor DA9121.  The
+         DA9210 is a dual-phase buck converter controlled through an I2C
+         interface.
+
+         This driver can also be built as a module. If so, the module
+         will be called da9121-regulator.
+
 config REGULATOR_DA9210
        tristate "Dialog Semiconductor DA9210 regulator"
        depends on I2C

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 6ebae51..6096862 100644 (file)
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_REGULATOR_DA9052)        += da9052-regulator.o
 obj-$(CONFIG_REGULATOR_DA9055) += da9055-regulator.o
 obj-$(CONFIG_REGULATOR_DA9062) += da9062-regulator.o
 obj-$(CONFIG_REGULATOR_DA9063) += da9063-regulator.o
+obj-$(CONFIG_REGULATOR_DA9121) += da9121-regulator.o
 obj-$(CONFIG_REGULATOR_DA9210) += da9210-regulator.o
 obj-$(CONFIG_REGULATOR_DA9211) += da9211-regulator.o
 obj-$(CONFIG_REGULATOR_DBX500_PRCMU) += dbx500-prcmu.o

diff --git a/drivers/regulator/da9121-regulator.c b/drivers/regulator/da9121-regulator.c
new file mode 100644 (file)
index 0000000..66bdfd1
--- /dev/null
+++ b/drivers/regulator/da9121-regulator.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2020 Axis Communications AB */
+
+#include <linux/of_device.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/driver.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+
+#define DA9121_BUCK_BUCK1_0                    0x20
+#define DA9121_BUCK_BUCK1_0_CH1_EN             BIT(0)
+
+#define DA9121_BUCK_BUCK1_5                    0x25
+#define DA9121_BUCK_BUCK1_5_CH1_A_VOUT         GENMASK(7, 0)
+
+#define DA9121_MIN_MV          300
+#define DA9121_MAX_MV          1900
+#define DA9121_STEP_MV         10
+#define DA9121_MIN_SEL         (DA9121_MIN_MV / DA9121_STEP_MV)
+#define DA9121_N_VOLTAGES      (((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
+                                + 1 + DA9121_MIN_SEL)
+
+static const struct regmap_config da9121_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+};
+
+static const struct regulator_ops da9121_buck_ops = {
+       .enable = regulator_enable_regmap,
+       .disable = regulator_disable_regmap,
+       .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 const struct regulator_desc da9121_reg = {
+       .name = "da9121",
+       .of_match = "buck1",
+       .owner = THIS_MODULE,
+       .ops = &da9121_buck_ops,
+       .type = REGULATOR_VOLTAGE,
+       .n_voltages = DA9121_N_VOLTAGES,
+       .min_uV = DA9121_MIN_MV * 1000,
+       .uV_step = DA9121_STEP_MV * 1000,
+       .linear_min_sel = DA9121_MIN_SEL,
+       .vsel_reg = DA9121_BUCK_BUCK1_5,
+       .vsel_mask = DA9121_BUCK_BUCK1_5_CH1_A_VOUT,
+       .enable_reg = DA9121_BUCK_BUCK1_0,
+       .enable_mask = DA9121_BUCK_BUCK1_0_CH1_EN,
+       /* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
+       .ramp_delay = 20000,
+       /* tBUCK_EN */
+       .enable_time = 20,
+};
+
+static const struct of_device_id da9121_dt_ids[] = {
+       { .compatible = "dlg,da9121", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, da9121_dt_ids);
+
+static int da9121_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, &da9121_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, &da9121_reg, &config);
+       if (IS_ERR(rdev)) {
+               dev_err(&i2c->dev, "Failed to register da9121 regulator\n");
+               return PTR_ERR(rdev);
+       }
+
+       return 0;
+}
+
+static const struct i2c_device_id da9121_i2c_id[] = {
+       { "da9121", 0 },
+       {},
+};
+MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);
+
+static struct i2c_driver da9121_regulator_driver = {
+       .driver = {
+               .name = "da9121",
+               .of_match_table = of_match_ptr(da9121_dt_ids),
+       },
+       .probe = da9121_i2c_probe,
+       .id_table = da9121_i2c_id,
+};
+
+module_i2c_driver(da9121_regulator_driver);
+
+MODULE_LICENSE("GPL v2");