linux/drivers/regulator/tps65912-regulator.c
Douglas Anderson 259b93b21a
regulator: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in 4.14
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>
2023-03-20 13:11:25 +00:00

163 lines
5.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Regulator driver for TI TPS65912x PMICs
*
* Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com/
* Andrew F. Davis <afd@ti.com>
*
* Based on the TPS65218 driver and the previous TPS65912 driver by
* Margarita Olaya Cabrera <magi@slimlogic.co.uk>
*/
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/tps65912.h>
enum tps65912_regulators { DCDC1, DCDC2, DCDC3, DCDC4, LDO1, LDO2, LDO3,
LDO4, LDO5, LDO6, LDO7, LDO8, LDO9, LDO10 };
#define TPS65912_REGULATOR(_name, _id, _of_match, _ops, _vr, _er, _lr) \
[_id] = { \
.name = _name, \
.of_match = _of_match, \
.regulators_node = "regulators", \
.id = _id, \
.ops = &_ops, \
.n_voltages = 64, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.vsel_reg = _vr, \
.vsel_mask = 0x3f, \
.enable_reg = _er, \
.enable_mask = BIT(7), \
.volt_table = NULL, \
.linear_ranges = _lr, \
.n_linear_ranges = ARRAY_SIZE(_lr), \
}
static const struct linear_range tps65912_dcdc_ranges[] = {
REGULATOR_LINEAR_RANGE(500000, 0x0, 0x3f, 50000),
};
static const struct linear_range tps65912_ldo_ranges[] = {
REGULATOR_LINEAR_RANGE(800000, 0x0, 0x20, 25000),
REGULATOR_LINEAR_RANGE(1650000, 0x21, 0x3c, 50000),
REGULATOR_LINEAR_RANGE(3100000, 0x3d, 0x3f, 100000),
};
/* Operations permitted on DCDCx */
static const struct regulator_ops tps65912_ops_dcdc = {
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear_range,
};
/* Operations permitted on LDOx */
static const struct regulator_ops tps65912_ops_ldo = {
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
};
static const struct regulator_desc regulators[] = {
TPS65912_REGULATOR("DCDC1", DCDC1, "dcdc1", tps65912_ops_dcdc,
TPS65912_DCDC1_OP, TPS65912_DCDC1_CTRL,
tps65912_dcdc_ranges),
TPS65912_REGULATOR("DCDC2", DCDC2, "dcdc2", tps65912_ops_dcdc,
TPS65912_DCDC2_OP, TPS65912_DCDC2_CTRL,
tps65912_dcdc_ranges),
TPS65912_REGULATOR("DCDC3", DCDC3, "dcdc3", tps65912_ops_dcdc,
TPS65912_DCDC3_OP, TPS65912_DCDC3_CTRL,
tps65912_dcdc_ranges),
TPS65912_REGULATOR("DCDC4", DCDC4, "dcdc4", tps65912_ops_dcdc,
TPS65912_DCDC4_OP, TPS65912_DCDC4_CTRL,
tps65912_dcdc_ranges),
TPS65912_REGULATOR("LDO1", LDO1, "ldo1", tps65912_ops_ldo,
TPS65912_LDO1_OP, TPS65912_LDO1_AVS,
tps65912_ldo_ranges),
TPS65912_REGULATOR("LDO2", LDO2, "ldo2", tps65912_ops_ldo,
TPS65912_LDO2_OP, TPS65912_LDO2_AVS,
tps65912_ldo_ranges),
TPS65912_REGULATOR("LDO3", LDO3, "ldo3", tps65912_ops_ldo,
TPS65912_LDO3_OP, TPS65912_LDO3_AVS,
tps65912_ldo_ranges),
TPS65912_REGULATOR("LDO4", LDO4, "ldo4", tps65912_ops_ldo,
TPS65912_LDO4_OP, TPS65912_LDO4_AVS,
tps65912_ldo_ranges),
TPS65912_REGULATOR("LDO5", LDO5, "ldo5", tps65912_ops_ldo,
TPS65912_LDO5, TPS65912_LDO5,
tps65912_ldo_ranges),
TPS65912_REGULATOR("LDO6", LDO6, "ldo6", tps65912_ops_ldo,
TPS65912_LDO6, TPS65912_LDO6,
tps65912_ldo_ranges),
TPS65912_REGULATOR("LDO7", LDO7, "ldo7", tps65912_ops_ldo,
TPS65912_LDO7, TPS65912_LDO7,
tps65912_ldo_ranges),
TPS65912_REGULATOR("LDO8", LDO8, "ldo8", tps65912_ops_ldo,
TPS65912_LDO8, TPS65912_LDO8,
tps65912_ldo_ranges),
TPS65912_REGULATOR("LDO9", LDO9, "ldo9", tps65912_ops_ldo,
TPS65912_LDO9, TPS65912_LDO9,
tps65912_ldo_ranges),
TPS65912_REGULATOR("LDO10", LDO10, "ldo10", tps65912_ops_ldo,
TPS65912_LDO10, TPS65912_LDO10,
tps65912_ldo_ranges),
};
static int tps65912_regulator_probe(struct platform_device *pdev)
{
struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent);
struct regulator_config config = { };
struct regulator_dev *rdev;
int i;
platform_set_drvdata(pdev, tps);
config.dev = &pdev->dev;
config.driver_data = tps;
config.dev->of_node = tps->dev->of_node;
config.regmap = tps->regmap;
for (i = 0; i < ARRAY_SIZE(regulators); i++) {
rdev = devm_regulator_register(&pdev->dev, &regulators[i],
&config);
if (IS_ERR(rdev)) {
dev_err(tps->dev, "failed to register %s regulator\n",
pdev->name);
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct platform_device_id tps65912_regulator_id_table[] = {
{ "tps65912-regulator", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, tps65912_regulator_id_table);
static struct platform_driver tps65912_regulator_driver = {
.driver = {
.name = "tps65912-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = tps65912_regulator_probe,
.id_table = tps65912_regulator_id_table,
};
module_platform_driver(tps65912_regulator_driver);
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_DESCRIPTION("TPS65912 voltage regulator driver");
MODULE_LICENSE("GPL v2");