Initial support for the Silergy SY7636A-regulator Power Management chip. Signed-off-by: Alistair Francis <alistair@xxxxxxxxxxxxx> --- v5: - Simplify the implementation drivers/regulator/Kconfig | 6 ++ drivers/regulator/Makefile | 1 + drivers/regulator/sy7636a-regulator.c | 127 ++++++++++++++++++++++++++ include/linux/mfd/sy7636a.h | 1 + 4 files changed, 135 insertions(+) create mode 100644 drivers/regulator/sy7636a-regulator.c diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 77c43134bc9e..6d501ce921a8 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -1130,6 +1130,12 @@ config REGULATOR_STW481X_VMMC This driver supports the internal VMMC regulator in the STw481x PMIC chips. +config REGULATOR_SY7636A + tristate "Silergy SY7636A voltage regulator" + depends on MFD_SY7636A + help + This driver supports Silergy SY3686A voltage regulator. + config REGULATOR_SY8106A tristate "Silergy SY8106A regulator" depends on I2C && (OF || COMPILE_TEST) diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 44d2f8bf4b74..5a981036a9f0 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -134,6 +134,7 @@ obj-$(CONFIG_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o obj-$(CONFIG_REGULATOR_STM32_PWR) += stm32-pwr.o obj-$(CONFIG_REGULATOR_STPMIC1) += stpmic1_regulator.o obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o +obj-$(CONFIG_REGULATOR_SY7636A) += sy7636a-regulator.o obj-$(CONFIG_REGULATOR_SY8106A) += sy8106a-regulator.o obj-$(CONFIG_REGULATOR_SY8824X) += sy8824x.o obj-$(CONFIG_REGULATOR_SY8827N) += sy8827n.o diff --git a/drivers/regulator/sy7636a-regulator.c b/drivers/regulator/sy7636a-regulator.c new file mode 100644 index 000000000000..c384c2b6ac46 --- /dev/null +++ b/drivers/regulator/sy7636a-regulator.c @@ -0,0 +1,127 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Functions to access SY3686A power management chip voltages +// +// Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ +// +// Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@xxxxxxxxxxxxxx> +// Alistair Francis <alistair@xxxxxxxxxxxxx> + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/gpio/consumer.h> +#include <linux/mfd/sy7636a.h> + +#define SY7636A_POLL_ENABLED_TIME 500 + +static int sy7636a_get_vcom_voltage_op(struct regulator_dev *rdev) +{ + int ret; + unsigned int val, val_h; + + ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val); + if (ret) + return ret; + + ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h); + if (ret) + return ret; + + val |= (val_h << VCOM_ADJUST_CTRL_SHIFT); + + return (val & VCOM_ADJUST_CTRL_MASK) * VCOM_ADJUST_CTRL_SCAL; +} + +static int sy7636a_get_status(struct regulator_dev *rdev) +{ + struct sy7636a *sy7636a = dev_get_drvdata(rdev->dev.parent); + int ret = 0; + + ret = gpiod_get_value_cansleep(sy7636a->pgood_gpio); + if (ret < 0) + dev_err(&rdev->dev, "Failed to read pgood gpio: %d\n", ret); + + return ret; +} + +static const struct regulator_ops sy7636a_vcom_volt_ops = { + .get_voltage = sy7636a_get_vcom_voltage_op, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .get_status = sy7636a_get_status, +}; + +struct regulator_desc desc = { + .name = "vcom", + .id = 0, + .ops = &sy7636a_vcom_volt_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, + .enable_reg = SY7636A_REG_OPERATION_MODE_CRL, + .enable_mask = SY7636A_OPERATION_MODE_CRL_ONOFF, + .poll_enabled_time = SY7636A_POLL_ENABLED_TIME, + .regulators_node = of_match_ptr("regulators"), + .of_match = of_match_ptr("vcom"), +}; + +static int sy7636a_regulator_probe(struct platform_device *pdev) +{ + struct sy7636a *sy7636a = dev_get_drvdata(pdev->dev.parent); + struct regulator_config config = { }; + struct regulator_dev *rdev; + struct gpio_desc *gdp; + int ret; + + if (!sy7636a) + return -EPROBE_DEFER; + + platform_set_drvdata(pdev, sy7636a); + + gdp = devm_gpiod_get(sy7636a->dev, "epd-pwr-good", GPIOD_IN); + if (IS_ERR(gdp)) { + dev_err(sy7636a->dev, "Power good GPIO fault %ld\n", PTR_ERR(gdp)); + return PTR_ERR(gdp); + } + + sy7636a->pgood_gpio = gdp; + + ret = regmap_write(sy7636a->regmap, SY7636A_REG_POWER_ON_DELAY_TIME, 0x0); + if (ret) { + dev_err(sy7636a->dev, "Failed to initialize regulator: %d\n", ret); + return ret; + } + + config.dev = &pdev->dev; + config.dev->of_node = sy7636a->dev->of_node; + config.driver_data = sy7636a; + config.regmap = sy7636a->regmap; + + rdev = devm_regulator_register(&pdev->dev, &desc, &config); + if (IS_ERR(rdev)) { + dev_err(sy7636a->dev, "Failed to register %s regulator\n", + pdev->name); + return PTR_ERR(rdev); + } + + return 0; +} + +static const struct platform_device_id sy7636a_regulator_id_table[] = { + { "sy7636a-regulator", }, +}; +MODULE_DEVICE_TABLE(platform, sy7636a_regulator_id_table); + +static struct platform_driver sy7636a_regulator_driver = { + .driver = { + .name = "sy7636a-regulator", + }, + .probe = sy7636a_regulator_probe, + .id_table = sy7636a_regulator_id_table, +}; +module_platform_driver(sy7636a_regulator_driver); + +MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@xxxxxxxxxxxxxx>"); +MODULE_DESCRIPTION("SY7636A voltage regulator driver"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/mfd/sy7636a.h b/include/linux/mfd/sy7636a.h index 43b0db0f8e6d..8e71a6e21791 100644 --- a/include/linux/mfd/sy7636a.h +++ b/include/linux/mfd/sy7636a.h @@ -41,6 +41,7 @@ struct sy7636a { struct device *dev; struct regmap *regmap; + struct gpio_desc *pgood_gpio; }; #endif /* __LINUX_MFD_SY7636A_H */ -- 2.31.1
