regulator: Initial commit of sy7636a
Initial support for the Silergy SY7636A-regulator Power Management chip driver. Signed-off-by: Alistair Francis <alistair@alistair23.me>rM2-mainline-working-wifi
Alistair Francis
parent
227a3ee195
commit
ce0e5a4197
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@ -1130,6 +1130,12 @@ config REGULATOR_STW481X_VMMC
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This driver supports the internal VMMC regulator in the STw481x
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PMIC chips.
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config REGULATOR_SY7636A
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tristate "Silergy SY7636A voltage regulator"
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depends on MFD_SY7636A
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help
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This driver supports Silergy SY3686A voltage regulator.
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config REGULATOR_SY8106A
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tristate "Silergy SY8106A regulator"
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depends on I2C && (OF || COMPILE_TEST)
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@ -134,6 +134,7 @@ obj-$(CONFIG_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o
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obj-$(CONFIG_REGULATOR_STM32_PWR) += stm32-pwr.o
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obj-$(CONFIG_REGULATOR_STPMIC1) += stpmic1_regulator.o
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obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
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obj-$(CONFIG_REGULATOR_SY7636A) += sy7636a-regulator.o
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obj-$(CONFIG_REGULATOR_SY8106A) += sy8106a-regulator.o
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obj-$(CONFIG_REGULATOR_SY8824X) += sy8824x.o
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obj-$(CONFIG_REGULATOR_SY8827N) += sy8827n.o
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@ -0,0 +1,215 @@
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// SPDX-License-Identifier: GPL-2.0+
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//
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// Functions to access SY3686A power management chip voltages
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//
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// Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/
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//
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// Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>
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// Alistair Francis <alistair@alistair23.me>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/gpio/consumer.h>
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#include <linux/mfd/sy7636a.h>
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static int sy7636a_get_vcom_voltage_mv(struct regmap *regmap)
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{
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int ret;
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unsigned int val, val_h;
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ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val);
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if (ret)
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return ret;
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ret = regmap_read(regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h);
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if (ret)
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return ret;
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val |= (val_h << 8);
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return (val & 0x1FF) * 10000;
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}
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static int sy7636a_get_vcom_voltage_op(struct regulator_dev *rdev)
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{
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return sy7636a_get_vcom_voltage_mv(rdev->regmap);
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}
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static int sy7636a_disable_regulator(struct regulator_dev *rdev)
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{
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struct sy7636a *sy7636a = dev_get_drvdata(rdev->dev.parent);
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int ret = 0;
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ret = regulator_disable_regmap(rdev);
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// Delay for ~35ms after disabling the regulator, to allow power ramp
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// down to go undisturbed
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usleep_range(30000, 35000);
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return ret;
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}
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static int sy7636a_regulator_is_enabled(struct regulator_dev *rdev)
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{
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struct sy7636a *sy7636a = dev_get_drvdata(rdev->dev.parent);
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int ret;
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ret = regulator_is_enabled_regmap(rdev);
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return ret;
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}
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static int sy7636a_get_status(struct regulator_dev *rdev)
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{
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struct sy7636a *sy7636a = dev_get_drvdata(rdev->dev.parent);
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int pwr_good = 0;
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const unsigned int wait_time = 500;
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unsigned int wait_cnt;
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int ret = 0;
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for (wait_cnt = 0; wait_cnt < wait_time; wait_cnt++) {
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pwr_good = gpiod_get_value_cansleep(sy7636a->pgood_gpio);
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if (pwr_good < 0) {
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dev_err(&rdev->dev, "Failed to read pgood gpio: %d\n", pwr_good);
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ret = pwr_good;
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return ret;
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} else if (pwr_good)
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break;
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usleep_range(1000, 1500);
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}
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return ret;
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}
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static int sy7636a_enable_regulator_pgood(struct regulator_dev *rdev)
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{
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struct sy7636a *sy7636a = dev_get_drvdata(rdev->dev.parent);
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int pwr_good = 0;
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int ret = 0;
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unsigned long t0, t1;
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const unsigned int wait_time = 500;
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unsigned int wait_cnt;
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t0 = jiffies;
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ret = regulator_enable_regmap(rdev);
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if (ret)
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goto finish;
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for (wait_cnt = 0; wait_cnt < wait_time; wait_cnt++) {
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pwr_good = gpiod_get_value_cansleep(sy7636a->pgood_gpio);
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if (pwr_good < 0) {
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dev_err(&rdev->dev, "Failed to read pgood gpio: %d\n", pwr_good);
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ret = pwr_good;
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goto finish;
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} else if (pwr_good)
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break;
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usleep_range(1000, 1500);
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}
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t1 = jiffies;
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if (!pwr_good) {
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dev_err(&rdev->dev, "Power good signal timeout after %u ms\n",
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jiffies_to_msecs(t1 - t0));
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ret = -ETIME;
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sy7636a_disable_regulator(rdev);
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goto finish;
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}
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dev_dbg(&rdev->dev, "Power good OK (took %u ms, %u waits)\n",
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jiffies_to_msecs(t1 - t0),
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wait_cnt);
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finish:
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return ret;
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}
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static const struct regulator_ops sy7636a_vcom_volt_ops = {
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.get_voltage = sy7636a_get_vcom_voltage_op,
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.enable = sy7636a_enable_regulator_pgood,
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.disable = sy7636a_disable_regulator,
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.is_enabled = sy7636a_regulator_is_enabled,
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.get_status = sy7636a_get_status,
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};
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struct regulator_desc desc = {
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.name = "vcom",
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.id = 0,
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.ops = &sy7636a_vcom_volt_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.enable_reg = SY7636A_REG_OPERATION_MODE_CRL,
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.enable_mask = SY7636A_OPERATION_MODE_CRL_ONOFF,
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.regulators_node = of_match_ptr("regulators"),
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.of_match = of_match_ptr("vcom"),
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};
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static int sy7636a_regulator_init(struct sy7636a *sy7636a)
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{
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return regmap_write(sy7636a->regmap,
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SY7636A_REG_POWER_ON_DELAY_TIME,
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0x0);
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}
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static int sy7636a_regulator_probe(struct platform_device *pdev)
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{
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struct sy7636a *sy7636a = dev_get_drvdata(pdev->dev.parent);
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struct regulator_config config = { };
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struct regulator_dev *rdev;
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struct gpio_desc *gdp;
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int ret;
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if (!sy7636a)
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return -EPROBE_DEFER;
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platform_set_drvdata(pdev, sy7636a);
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gdp = devm_gpiod_get(sy7636a->dev, "epd-pwr-good", GPIOD_IN);
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if (IS_ERR(gdp)) {
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dev_err(sy7636a->dev, "Power good GPIO fault %ld\n", PTR_ERR(gdp));
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return PTR_ERR(gdp);
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}
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sy7636a->pgood_gpio = gdp;
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ret = sy7636a_regulator_init(sy7636a);
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if (ret) {
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dev_err(sy7636a->dev, "Failed to initialize regulator: %d\n", ret);
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return ret;
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}
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config.dev = &pdev->dev;
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config.dev->of_node = sy7636a->dev->of_node;
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config.driver_data = sy7636a;
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config.regmap = sy7636a->regmap;
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rdev = devm_regulator_register(&pdev->dev, &desc, &config);
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if (IS_ERR(rdev)) {
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dev_err(sy7636a->dev, "Failed to register %s regulator\n",
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pdev->name);
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return PTR_ERR(rdev);
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}
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return 0;
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}
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static const struct platform_device_id sy7636a_regulator_id_table[] = {
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{ "sy7636a-regulator", },
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};
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MODULE_DEVICE_TABLE(platform, sy7636a_regulator_id_table);
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static struct platform_driver sy7636a_regulator_driver = {
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.driver = {
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.name = "sy7636a-regulator",
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},
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.probe = sy7636a_regulator_probe,
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.id_table = sy7636a_regulator_id_table,
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};
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module_platform_driver(sy7636a_regulator_driver);
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MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>");
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MODULE_DESCRIPTION("SY7636A voltage regulator driver");
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MODULE_LICENSE("GPL v2");
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