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Probing of regulators can be a slow operation and can contribute to slower boot times. This is especially true if a regulator is turned on at probe time (with regulator-boot-on or regulator-always-on) and the regulator requires delays (off-on-time, ramp time, etc). While the overall kernel is not ready to switch to async probe by default, as per the discussion on the mailing lists [1] it is believed that the regulator subsystem is in good shape and we can move regulator drivers over wholesale. There is no way to just magically opt in all regulators (regulators are just normal drivers like platform_driver), so we set PROBE_PREFER_ASYNCHRONOUS for all regulators found in 'drivers/regulator' individually. Given the number of drivers touched and the impossibility to test this ahead of time, it wouldn't be shocking at all if this caused a regression for someone. If there is a regression caused by this patch, it's likely to be one of the cases talked about in [1]. As a "quick fix", drivers involved in the regression could be fixed by changing them to PROBE_FORCE_SYNCHRONOUS. That being said, the correct fix would be to directly fix the problem that caused the issue with async probe. The approach here follows a similar approach that was used for the mmc subsystem several years ago [2]. In fact, I ran nearly the same python script to auto-generate the changes. The only thing I changed was to search for "i2c_driver", "spmi_driver", and "spi_driver" in addition to "platform_driver". [1] https://lore.kernel.org/r/06db017f-e985-4434-8d1d-02ca2100cca0@sirena.org.uk [2] https://lore.kernel.org/r/20200903232441.2694866-1-dianders@chromium.org/ Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20230316125351.1.I2a4677392a38db5758dee0788b2cea5872562a82@changeid Signed-off-by: Mark Brown <broonie@kernel.org>
156 lines
5.5 KiB
C
156 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Regulator driver for Ricoh RN5T618 PMIC
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*
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* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
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*/
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#include <linux/mfd/rn5t618.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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static const struct regulator_ops rn5t618_reg_ops = {
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear,
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};
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#define REG(rid, ereg, emask, vreg, vmask, min, max, step) \
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{ \
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.name = #rid, \
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.of_match = of_match_ptr(#rid), \
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.regulators_node = of_match_ptr("regulators"), \
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.id = RN5T618_##rid, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.ops = &rn5t618_reg_ops, \
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.n_voltages = ((max) - (min)) / (step) + 1, \
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.min_uV = (min), \
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.uV_step = (step), \
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.enable_reg = RN5T618_##ereg, \
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.enable_mask = (emask), \
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.vsel_reg = RN5T618_##vreg, \
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.vsel_mask = (vmask), \
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}
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static const struct regulator_desc rn5t567_regulators[] = {
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/* DCDC */
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REG(DCDC1, DC1CTL, BIT(0), DC1DAC, 0xff, 600000, 3500000, 12500),
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REG(DCDC2, DC2CTL, BIT(0), DC2DAC, 0xff, 600000, 3500000, 12500),
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REG(DCDC3, DC3CTL, BIT(0), DC3DAC, 0xff, 600000, 3500000, 12500),
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REG(DCDC4, DC4CTL, BIT(0), DC4DAC, 0xff, 600000, 3500000, 12500),
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/* LDO */
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REG(LDO1, LDOEN1, BIT(0), LDO1DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO2, LDOEN1, BIT(1), LDO2DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO3, LDOEN1, BIT(2), LDO3DAC, 0x7f, 600000, 3500000, 25000),
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REG(LDO4, LDOEN1, BIT(3), LDO4DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO5, LDOEN1, BIT(4), LDO5DAC, 0x7f, 900000, 3500000, 25000),
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/* LDO RTC */
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REG(LDORTC1, LDOEN2, BIT(4), LDORTCDAC, 0x7f, 1200000, 3500000, 25000),
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REG(LDORTC2, LDOEN2, BIT(5), LDORTC2DAC, 0x7f, 900000, 3500000, 25000),
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};
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static const struct regulator_desc rn5t618_regulators[] = {
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/* DCDC */
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REG(DCDC1, DC1CTL, BIT(0), DC1DAC, 0xff, 600000, 3500000, 12500),
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REG(DCDC2, DC2CTL, BIT(0), DC2DAC, 0xff, 600000, 3500000, 12500),
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REG(DCDC3, DC3CTL, BIT(0), DC3DAC, 0xff, 600000, 3500000, 12500),
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/* LDO */
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REG(LDO1, LDOEN1, BIT(0), LDO1DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO2, LDOEN1, BIT(1), LDO2DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO3, LDOEN1, BIT(2), LDO3DAC, 0x7f, 600000, 3500000, 25000),
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REG(LDO4, LDOEN1, BIT(3), LDO4DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO5, LDOEN1, BIT(4), LDO5DAC, 0x7f, 900000, 3500000, 25000),
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/* LDO RTC */
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REG(LDORTC1, LDOEN2, BIT(4), LDORTCDAC, 0x7f, 1700000, 3500000, 25000),
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REG(LDORTC2, LDOEN2, BIT(5), LDORTC2DAC, 0x7f, 900000, 3500000, 25000),
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};
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static const struct regulator_desc rc5t619_regulators[] = {
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/* DCDC */
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REG(DCDC1, DC1CTL, BIT(0), DC1DAC, 0xff, 600000, 3500000, 12500),
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REG(DCDC2, DC2CTL, BIT(0), DC2DAC, 0xff, 600000, 3500000, 12500),
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REG(DCDC3, DC3CTL, BIT(0), DC3DAC, 0xff, 600000, 3500000, 12500),
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REG(DCDC4, DC4CTL, BIT(0), DC4DAC, 0xff, 600000, 3500000, 12500),
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REG(DCDC5, DC5CTL, BIT(0), DC5DAC, 0xff, 600000, 3500000, 12500),
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/* LDO */
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REG(LDO1, LDOEN1, BIT(0), LDO1DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO2, LDOEN1, BIT(1), LDO2DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO3, LDOEN1, BIT(2), LDO3DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO4, LDOEN1, BIT(3), LDO4DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO5, LDOEN1, BIT(4), LDO5DAC, 0x7f, 600000, 3500000, 25000),
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REG(LDO6, LDOEN1, BIT(5), LDO6DAC, 0x7f, 600000, 3500000, 25000),
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REG(LDO7, LDOEN1, BIT(6), LDO7DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO8, LDOEN1, BIT(7), LDO8DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO9, LDOEN2, BIT(0), LDO9DAC, 0x7f, 900000, 3500000, 25000),
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REG(LDO10, LDOEN2, BIT(1), LDO10DAC, 0x7f, 900000, 3500000, 25000),
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/* LDO RTC */
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REG(LDORTC1, LDOEN2, BIT(4), LDORTCDAC, 0x7f, 1700000, 3500000, 25000),
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REG(LDORTC2, LDOEN2, BIT(5), LDORTC2DAC, 0x7f, 900000, 3500000, 25000),
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};
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static int rn5t618_regulator_probe(struct platform_device *pdev)
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{
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struct rn5t618 *rn5t618 = 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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const struct regulator_desc *regulators;
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int i;
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int num_regulators = 0;
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switch (rn5t618->variant) {
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case RN5T567:
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regulators = rn5t567_regulators;
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num_regulators = ARRAY_SIZE(rn5t567_regulators);
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break;
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case RN5T618:
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regulators = rn5t618_regulators;
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num_regulators = ARRAY_SIZE(rn5t618_regulators);
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break;
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case RC5T619:
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regulators = rc5t619_regulators;
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num_regulators = ARRAY_SIZE(rc5t619_regulators);
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break;
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default:
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return -EINVAL;
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}
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config.dev = pdev->dev.parent;
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config.regmap = rn5t618->regmap;
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for (i = 0; i < num_regulators; i++) {
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rdev = devm_regulator_register(&pdev->dev,
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®ulators[i],
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&config);
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if (IS_ERR(rdev)) {
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dev_err(&pdev->dev, "failed to register %s regulator\n",
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regulators[i].name);
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return PTR_ERR(rdev);
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}
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}
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return 0;
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}
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static struct platform_driver rn5t618_regulator_driver = {
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.probe = rn5t618_regulator_probe,
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.driver = {
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.name = "rn5t618-regulator",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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};
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module_platform_driver(rn5t618_regulator_driver);
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MODULE_ALIAS("platform:rn5t618-regulator");
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MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
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MODULE_DESCRIPTION("RN5T618 regulator driver");
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MODULE_LICENSE("GPL v2");
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