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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>
250 lines
7.3 KiB
C
250 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Regulator driver for LP87565 PMIC
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*
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* Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
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*/
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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/mfd/lp87565.h>
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enum LP87565_regulator_id {
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/* BUCK's */
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LP87565_BUCK_0,
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LP87565_BUCK_1,
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LP87565_BUCK_2,
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LP87565_BUCK_3,
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LP87565_BUCK_10,
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LP87565_BUCK_23,
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LP87565_BUCK_3210,
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};
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#define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, \
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_er, _em, _ev, _delay, _lr, _cr) \
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[_id] = { \
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.desc = { \
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.name = _name, \
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.supply_name = _of "-in", \
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.id = _id, \
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.of_match = of_match_ptr(_of), \
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.regulators_node = of_match_ptr("regulators"),\
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.ops = &_ops, \
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.n_voltages = _n, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.vsel_reg = _vr, \
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.vsel_mask = _vm, \
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.enable_reg = _er, \
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.enable_mask = _em, \
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.enable_val = _ev, \
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.ramp_delay = _delay, \
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.linear_ranges = _lr, \
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.n_linear_ranges = ARRAY_SIZE(_lr), \
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.curr_table = lp87565_buck_uA, \
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.n_current_limits = ARRAY_SIZE(lp87565_buck_uA),\
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.csel_reg = (_cr), \
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.csel_mask = LP87565_BUCK_CTRL_2_ILIM, \
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}, \
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.ctrl2_reg = _cr, \
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}
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struct lp87565_regulator {
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struct regulator_desc desc;
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unsigned int ctrl2_reg;
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};
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static const struct lp87565_regulator regulators[];
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static const struct linear_range buck0_1_2_3_ranges[] = {
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REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
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REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
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REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
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};
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static const unsigned int lp87565_buck_ramp_delay[] = {
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30000, 15000, 10000, 7500, 3800, 1900, 940, 470
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};
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/* LP87565 BUCK current limit */
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static const unsigned int lp87565_buck_uA[] = {
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1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
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};
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static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
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int ramp_delay)
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{
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int id = rdev_get_id(rdev);
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unsigned int reg;
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int ret;
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if (ramp_delay <= 470)
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reg = 7;
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else if (ramp_delay <= 940)
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reg = 6;
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else if (ramp_delay <= 1900)
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reg = 5;
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else if (ramp_delay <= 3800)
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reg = 4;
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else if (ramp_delay <= 7500)
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reg = 3;
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else if (ramp_delay <= 10000)
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reg = 2;
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else if (ramp_delay <= 15000)
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reg = 1;
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else
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reg = 0;
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ret = regmap_update_bits(rdev->regmap, regulators[id].ctrl2_reg,
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LP87565_BUCK_CTRL_2_SLEW_RATE,
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reg << __ffs(LP87565_BUCK_CTRL_2_SLEW_RATE));
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if (ret) {
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dev_err(&rdev->dev, "SLEW RATE write failed: %d\n", ret);
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return ret;
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}
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rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];
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/* Conservatively give a 15% margin */
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rdev->constraints->ramp_delay =
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rdev->constraints->ramp_delay * 85 / 100;
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return 0;
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}
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/* Operations permitted on BUCKs */
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static const struct regulator_ops lp87565_buck_ops = {
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.is_enabled = regulator_is_enabled_regmap,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear_range,
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.map_voltage = regulator_map_voltage_linear_range,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.set_ramp_delay = lp87565_buck_set_ramp_delay,
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.set_current_limit = regulator_set_current_limit_regmap,
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.get_current_limit = regulator_get_current_limit_regmap,
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};
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static const struct lp87565_regulator regulators[] = {
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LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
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256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
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LP87565_REG_BUCK0_CTRL_1,
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LP87565_BUCK_CTRL_1_EN |
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LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
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LP87565_BUCK_CTRL_1_EN, 3230,
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buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
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LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
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256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
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LP87565_REG_BUCK1_CTRL_1,
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LP87565_BUCK_CTRL_1_EN |
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LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
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LP87565_BUCK_CTRL_1_EN, 3230,
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buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
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LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
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256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
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LP87565_REG_BUCK2_CTRL_1,
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LP87565_BUCK_CTRL_1_EN |
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LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
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LP87565_BUCK_CTRL_1_EN, 3230,
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buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
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LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
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256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
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LP87565_REG_BUCK3_CTRL_1,
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LP87565_BUCK_CTRL_1_EN |
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LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
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LP87565_BUCK_CTRL_1_EN, 3230,
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buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
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LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
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256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
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LP87565_REG_BUCK0_CTRL_1,
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LP87565_BUCK_CTRL_1_EN |
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LP87565_BUCK_CTRL_1_EN_PIN_CTRL |
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LP87565_BUCK_CTRL_1_FPWM_MP_0_2,
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LP87565_BUCK_CTRL_1_EN |
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LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
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buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
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LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
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256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
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LP87565_REG_BUCK2_CTRL_1,
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LP87565_BUCK_CTRL_1_EN |
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LP87565_BUCK_CTRL_1_EN_PIN_CTRL,
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LP87565_BUCK_CTRL_1_EN, 3230,
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buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
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LP87565_REGULATOR("BUCK3210", LP87565_BUCK_3210, "buck3210",
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lp87565_buck_ops, 256, LP87565_REG_BUCK0_VOUT,
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LP87565_BUCK_VSET, LP87565_REG_BUCK0_CTRL_1,
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LP87565_BUCK_CTRL_1_EN |
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LP87565_BUCK_CTRL_1_EN_PIN_CTRL |
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LP87565_BUCK_CTRL_1_FPWM_MP_0_2,
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LP87565_BUCK_CTRL_1_EN |
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LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
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buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
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};
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static int lp87565_regulator_probe(struct platform_device *pdev)
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{
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struct lp87565 *lp87565 = 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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int i, min_idx, max_idx;
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platform_set_drvdata(pdev, lp87565);
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config.dev = &pdev->dev;
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config.dev->of_node = lp87565->dev->of_node;
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config.driver_data = lp87565;
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config.regmap = lp87565->regmap;
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switch (lp87565->dev_type) {
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case LP87565_DEVICE_TYPE_LP87565_Q1:
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min_idx = LP87565_BUCK_10;
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max_idx = LP87565_BUCK_23;
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break;
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case LP87565_DEVICE_TYPE_LP87561_Q1:
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min_idx = LP87565_BUCK_3210;
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max_idx = LP87565_BUCK_3210;
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break;
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default:
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min_idx = LP87565_BUCK_0;
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max_idx = LP87565_BUCK_3;
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break;
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}
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for (i = min_idx; i <= max_idx; i++) {
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rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc,
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&config);
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if (IS_ERR(rdev)) {
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dev_err(lp87565->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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}
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return 0;
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}
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static const struct platform_device_id lp87565_regulator_id_table[] = {
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{ "lp87565-regulator", },
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{ "lp87565-q1-regulator", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);
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static struct platform_driver lp87565_regulator_driver = {
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.driver = {
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.name = "lp87565-pmic",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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},
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.probe = lp87565_regulator_probe,
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.id_table = lp87565_regulator_id_table,
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};
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module_platform_driver(lp87565_regulator_driver);
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MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
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MODULE_DESCRIPTION("LP87565 voltage regulator driver");
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MODULE_LICENSE("GPL v2");
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