From 5bcc6066f1dfbbef937ca8584a0fba44bb1468f0 Mon Sep 17 00:00:00 2001 From: Ondrej Jirman Date: Sat, 25 Jun 2016 02:13:50 +0200 Subject: [PATCH] regulator: SY8106A regulator driver SY8106A is I2C attached single output voltage regulator made by Silergy. Signed-off-by: Ondrej Jirman --- drivers/regulator/Kconfig | 8 +- drivers/regulator/Makefile | 2 +- drivers/regulator/sy8106a-regulator.c | 167 ++++++++++++++++++++++++++++++++++ 3 files changed, 175 insertions(+), 2 deletions(-) create mode 100644 drivers/regulator/sy8106a-regulator.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index be06eb2..9c4b51e 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -727,6 +727,13 @@ config REGULATOR_STW481X_VMMC This driver supports the internal VMMC regulator in the STw481x PMIC chips. +config REGULATOR_SY8106A + tristate "Silergy SY8106A" + depends on I2C && (OF || COMPILE_TEST) + select REGMAP_I2C + help + This driver provides support for SY8106A voltage regulator. + config REGULATOR_TPS51632 tristate "TI TPS51632 Power Regulator" depends on I2C @@ -886,4 +893,3 @@ config REGULATOR_WM8994 WM8994 CODEC. endif - diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index ef7725e..a829718 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -91,6 +91,7 @@ obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o +obj-$(CONFIG_REGULATOR_SY8106A) += sy8106a-regulator.o obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o @@ -114,5 +115,4 @@ obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o - ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG diff --git a/drivers/regulator/sy8106a-regulator.c b/drivers/regulator/sy8106a-regulator.c new file mode 100644 index 0000000..7274965 --- /dev/null +++ b/drivers/regulator/sy8106a-regulator.c @@ -0,0 +1,167 @@ +/* + * sy8106a-regulator.c - Regulator device driver for SY8106A + * + * Copyright (C) 2016 Ondřej Jirman + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, + * Boston, MA 02110-1301, USA. + */ + +#include +#include +#include +#include +#include +#include + +#define SY8106A_REG_VOUT1_SEL 0x01 +#define SY8106A_REG_VOUT_COM 0x02 +#define SY8106A_REG_VOUT1_SEL_MASK 0x7f +#define SY8106A_DISABLE_REG BIT(0) +#define SY8106A_GO_BIT BIT(7) + +struct sy8106a { + struct regulator_dev *rdev; + struct regmap *regmap; +}; + +static const struct regmap_config sy8106a_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static int sy8106a_set_voltage_sel(struct regulator_dev *rdev, unsigned sel) +{ + /* We use our set_voltage_sel in order to avoid unnecessary I2C chatter, + * because the regulator_get_voltage_sel_regmap using apply_bit + * would perform 4 unnecessary transfers instead of one, increasing the + * chance of error. + */ + return regmap_write(rdev->regmap, rdev->desc->vsel_reg, + sel | SY8106A_GO_BIT); +} + +static const struct regulator_ops sy8106a_ops = { + .is_enabled = regulator_is_enabled_regmap, + .set_voltage_sel = sy8106a_set_voltage_sel, + .set_voltage_time_sel = regulator_set_voltage_time_sel, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .list_voltage = regulator_list_voltage_linear, +}; + +/* Default limits measured in millivolts and milliamps */ +#define SY8106A_MIN_MV 680 +#define SY8106A_MAX_MV 1950 +#define SY8106A_STEP_MV 10 + +static const struct regulator_desc sy8106a_reg = { + .name = "SY8106A", + .id = 0, + .ops = &sy8106a_ops, + .type = REGULATOR_VOLTAGE, + .n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1, + .min_uV = (SY8106A_MIN_MV * 1000), + .uV_step = (SY8106A_STEP_MV * 1000), + .vsel_reg = SY8106A_REG_VOUT1_SEL, + .vsel_mask = SY8106A_REG_VOUT1_SEL_MASK, + .enable_reg = SY8106A_REG_VOUT_COM, + .enable_mask = SY8106A_DISABLE_REG, + .disable_val = SY8106A_DISABLE_REG, + .enable_is_inverted = 1, + .owner = THIS_MODULE, +}; + +/* + * I2C driver interface functions + */ +static int sy8106a_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct sy8106a *chip; + struct device *dev = &i2c->dev; + struct regulator_dev *rdev = NULL; + struct regulator_config config = { }; + unsigned int selector; + int error; + + chip = devm_kzalloc(&i2c->dev, sizeof(struct sy8106a), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config); + if (IS_ERR(chip->regmap)) { + error = PTR_ERR(chip->regmap); + dev_err(&i2c->dev, "Failed to allocate register map: %d\n", + error); + return error; + } + + config.dev = &i2c->dev; + config.regmap = chip->regmap; + config.driver_data = chip; + + config.of_node = dev->of_node; + config.init_data = of_get_regulator_init_data(dev, dev->of_node, &sy8106a_reg); + if (!config.init_data) { + return -ENOMEM; + } + + /* Probe regulator */ + error = regmap_read(chip->regmap, SY8106A_REG_VOUT1_SEL, &selector); + if (error) { + dev_err(&i2c->dev, "Failed to read voltage at probe time: %d\n", error); + return error; + } + + rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config); + if (IS_ERR(rdev)) { + error = PTR_ERR(rdev); + dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error); + return error; + } + + chip->rdev = rdev; + + i2c_set_clientdata(i2c, chip); + + return 0; +} + +static const struct of_device_id sy8106a_i2c_of_match[] = { + { .compatible = "silergy,sy8106a" }, + { }, +}; +MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match); + +static const struct i2c_device_id sy8106a_i2c_id[] = { + { "sy8106a", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id); + +static struct i2c_driver sy8106a_regulator_driver = { + .driver = { + .name = "sy8106a", + .of_match_table = of_match_ptr(sy8106a_i2c_of_match), + }, + .probe = sy8106a_i2c_probe, + .id_table = sy8106a_i2c_id, +}; + +module_i2c_driver(sy8106a_regulator_driver); + +MODULE_AUTHOR("Ondřej Jirman "); +MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A"); +MODULE_LICENSE("GPL v2"); From cbbe21d790a5a47e69238ed64d53acd36752d7ae Mon Sep 17 00:00:00 2001 From: Ondrej Jirman Date: Sat, 25 Jun 2016 02:20:08 +0200 Subject: [PATCH] dt-bindings: document SY8106A regulator driver This patch adds the binding documentation for the sy8106a regulator driver. Signed-off-by: Ondrej Jirman --- .../bindings/regulator/sy8106a-regulator.txt | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 Documentation/devicetree/bindings/regulator/sy8106a-regulator.txt diff --git a/Documentation/devicetree/bindings/regulator/sy8106a-regulator.txt b/Documentation/devicetree/bindings/regulator/sy8106a-regulator.txt new file mode 100644 index 0000000..1e623a34 --- /dev/null +++ b/Documentation/devicetree/bindings/regulator/sy8106a-regulator.txt @@ -0,0 +1,21 @@ +SY8106A Voltage regulator + +Required properties: +- compatible: Must be "silergy,sy8106a" +- reg: I2C slave address - must be <0x65> + +Any property defined as part of the core regulator binding, defined in +regulator.txt, can also be used. + +Example: + + sy8106a { + compatible = "silergy,sy8106a"; + reg = <0x65>; + regulator-name = "sy8106a-vdd"; + regulator-min-microvolt = <1000000>; + regulator-max-microvolt = <1400000>; + regulator-ramp-delay = <200>; + regulator-boot-on; + regulator-always-on; + };