regulator: sy7636a: Initial commit

Initial support for the Silergy SY7636A-regulator Power Management chip.

Signed-off-by: Alistair Francis <alistair@alistair23.me>
Link: https://lore.kernel.org/r/20210615103400.946-3-alistair@alistair23.me
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 3134211b94983d61cab5127de621fa1df13a815e..a69b546872c1b811e5f1a5f13846a0c2ae0cb3c1 100644 (file)
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -1169,6 +1169,12 @@ 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 59ce3359a84a547a7b6e27735a16b5e50f1270f6..028f2b8788db25d501e8e79cf8c963ab5f41b4f0 100644 (file)
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -138,6 +138,7 @@ 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 (file)
index 0000000..c384c2b
--- /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@remarkable.com>
+//          Alistair Francis <alistair@alistair23.me>
+
+#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@remarkable.com>");
+MODULE_DESCRIPTION("SY7636A voltage regulator driver");
+MODULE_LICENSE("GPL v2");