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linux/drivers/regulator/88pm800-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

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9.2 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Regulators driver for Marvell 88PM800
*
* Copyright (C) 2012 Marvell International Ltd.
* Joseph(Yossi) Hanin <yhanin@marvell.com>
* Yi Zhang <yizhang@marvell.com>
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/88pm80x.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/regulator/of_regulator.h>
/* LDO1 with DVC[0..3] */
#define PM800_LDO1_VOUT (0x08) /* VOUT1 */
#define PM800_LDO1_VOUT_2 (0x09)
#define PM800_LDO1_VOUT_3 (0x0A)
#define PM800_LDO2_VOUT (0x0B)
#define PM800_LDO3_VOUT (0x0C)
#define PM800_LDO4_VOUT (0x0D)
#define PM800_LDO5_VOUT (0x0E)
#define PM800_LDO6_VOUT (0x0F)
#define PM800_LDO7_VOUT (0x10)
#define PM800_LDO8_VOUT (0x11)
#define PM800_LDO9_VOUT (0x12)
#define PM800_LDO10_VOUT (0x13)
#define PM800_LDO11_VOUT (0x14)
#define PM800_LDO12_VOUT (0x15)
#define PM800_LDO13_VOUT (0x16)
#define PM800_LDO14_VOUT (0x17)
#define PM800_LDO15_VOUT (0x18)
#define PM800_LDO16_VOUT (0x19)
#define PM800_LDO17_VOUT (0x1A)
#define PM800_LDO18_VOUT (0x1B)
#define PM800_LDO19_VOUT (0x1C)
/* BUCK1 with DVC[0..3] */
#define PM800_BUCK1 (0x3C)
#define PM800_BUCK1_1 (0x3D)
#define PM800_BUCK1_2 (0x3E)
#define PM800_BUCK1_3 (0x3F)
#define PM800_BUCK2 (0x40)
#define PM800_BUCK3 (0x41)
#define PM800_BUCK4 (0x42)
#define PM800_BUCK4_1 (0x43)
#define PM800_BUCK4_2 (0x44)
#define PM800_BUCK4_3 (0x45)
#define PM800_BUCK5 (0x46)
#define PM800_BUCK_ENA (0x50)
#define PM800_LDO_ENA1_1 (0x51)
#define PM800_LDO_ENA1_2 (0x52)
#define PM800_LDO_ENA1_3 (0x53)
#define PM800_LDO_ENA2_1 (0x56)
#define PM800_LDO_ENA2_2 (0x57)
#define PM800_LDO_ENA2_3 (0x58)
#define PM800_BUCK1_MISC1 (0x78)
#define PM800_BUCK3_MISC1 (0x7E)
#define PM800_BUCK4_MISC1 (0x81)
#define PM800_BUCK5_MISC1 (0x84)
struct pm800_regulator_info {
struct regulator_desc desc;
int max_ua;
};
/*
* vreg - the buck regs string.
* ereg - the string for the enable register.
* ebit - the bit number in the enable register.
* amax - the current
* Buck has 2 kinds of voltage steps. It is easy to find voltage by ranges,
* not the constant voltage table.
* n_volt - Number of available selectors
*/
#define PM800_BUCK(match, vreg, ereg, ebit, amax, volt_ranges, n_volt) \
{ \
.desc = { \
.name = #vreg, \
.of_match = of_match_ptr(#match), \
.regulators_node = of_match_ptr("regulators"), \
.ops = &pm800_volt_range_ops, \
.type = REGULATOR_VOLTAGE, \
.id = PM800_ID_##vreg, \
.owner = THIS_MODULE, \
.n_voltages = n_volt, \
.linear_ranges = volt_ranges, \
.n_linear_ranges = ARRAY_SIZE(volt_ranges), \
.vsel_reg = PM800_##vreg, \
.vsel_mask = 0x7f, \
.enable_reg = PM800_##ereg, \
.enable_mask = 1 << (ebit), \
}, \
.max_ua = (amax), \
}
/*
* vreg - the LDO regs string
* ereg - the string for the enable register.
* ebit - the bit number in the enable register.
* amax - the current
* volt_table - the LDO voltage table
* For all the LDOes, there are too many ranges. Using volt_table will be
* simpler and faster.
*/
#define PM800_LDO(match, vreg, ereg, ebit, amax, ldo_volt_table) \
{ \
.desc = { \
.name = #vreg, \
.of_match = of_match_ptr(#match), \
.regulators_node = of_match_ptr("regulators"), \
.ops = &pm800_volt_table_ops, \
.type = REGULATOR_VOLTAGE, \
.id = PM800_ID_##vreg, \
.owner = THIS_MODULE, \
.n_voltages = ARRAY_SIZE(ldo_volt_table), \
.vsel_reg = PM800_##vreg##_VOUT, \
.vsel_mask = 0xf, \
.enable_reg = PM800_##ereg, \
.enable_mask = 1 << (ebit), \
.volt_table = ldo_volt_table, \
}, \
.max_ua = (amax), \
}
/* Ranges are sorted in ascending order. */
static const struct linear_range buck1_volt_range[] = {
REGULATOR_LINEAR_RANGE(600000, 0, 0x4f, 12500),
REGULATOR_LINEAR_RANGE(1600000, 0x50, 0x54, 50000),
};
/* BUCK 2~5 have same ranges. */
static const struct linear_range buck2_5_volt_range[] = {
REGULATOR_LINEAR_RANGE(600000, 0, 0x4f, 12500),
REGULATOR_LINEAR_RANGE(1600000, 0x50, 0x72, 50000),
};
static const unsigned int ldo1_volt_table[] = {
600000, 650000, 700000, 750000, 800000, 850000, 900000, 950000,
1000000, 1050000, 1100000, 1150000, 1200000, 1300000, 1400000, 1500000,
};
static const unsigned int ldo2_volt_table[] = {
1700000, 1800000, 1900000, 2000000, 2100000, 2500000, 2700000, 2800000,
};
/* LDO 3~17 have same voltage table. */
static const unsigned int ldo3_17_volt_table[] = {
1200000, 1250000, 1700000, 1800000, 1850000, 1900000, 2500000, 2600000,
2700000, 2750000, 2800000, 2850000, 2900000, 3000000, 3100000, 3300000,
};
/* LDO 18~19 have same voltage table. */
static const unsigned int ldo18_19_volt_table[] = {
1700000, 1800000, 1900000, 2500000, 2800000, 2900000, 3100000, 3300000,
};
static int pm800_get_current_limit(struct regulator_dev *rdev)
{
struct pm800_regulator_info *info = rdev_get_drvdata(rdev);
return info->max_ua;
}
static const struct regulator_ops pm800_volt_range_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.get_current_limit = pm800_get_current_limit,
};
static const struct regulator_ops pm800_volt_table_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_iterate,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.get_current_limit = pm800_get_current_limit,
};
/* The array is indexed by id(PM800_ID_XXX) */
static struct pm800_regulator_info pm800_regulator_info[] = {
PM800_BUCK(buck1, BUCK1, BUCK_ENA, 0, 3000000, buck1_volt_range, 0x55),
PM800_BUCK(buck2, BUCK2, BUCK_ENA, 1, 1200000, buck2_5_volt_range, 0x73),
PM800_BUCK(buck3, BUCK3, BUCK_ENA, 2, 1200000, buck2_5_volt_range, 0x73),
PM800_BUCK(buck4, BUCK4, BUCK_ENA, 3, 1200000, buck2_5_volt_range, 0x73),
PM800_BUCK(buck5, BUCK5, BUCK_ENA, 4, 1200000, buck2_5_volt_range, 0x73),
PM800_LDO(ldo1, LDO1, LDO_ENA1_1, 0, 200000, ldo1_volt_table),
PM800_LDO(ldo2, LDO2, LDO_ENA1_1, 1, 10000, ldo2_volt_table),
PM800_LDO(ldo3, LDO3, LDO_ENA1_1, 2, 300000, ldo3_17_volt_table),
PM800_LDO(ldo4, LDO4, LDO_ENA1_1, 3, 300000, ldo3_17_volt_table),
PM800_LDO(ldo5, LDO5, LDO_ENA1_1, 4, 300000, ldo3_17_volt_table),
PM800_LDO(ldo6, LDO6, LDO_ENA1_1, 5, 300000, ldo3_17_volt_table),
PM800_LDO(ldo7, LDO7, LDO_ENA1_1, 6, 300000, ldo3_17_volt_table),
PM800_LDO(ldo8, LDO8, LDO_ENA1_1, 7, 300000, ldo3_17_volt_table),
PM800_LDO(ldo9, LDO9, LDO_ENA1_2, 0, 300000, ldo3_17_volt_table),
PM800_LDO(ldo10, LDO10, LDO_ENA1_2, 1, 300000, ldo3_17_volt_table),
PM800_LDO(ldo11, LDO11, LDO_ENA1_2, 2, 300000, ldo3_17_volt_table),
PM800_LDO(ldo12, LDO12, LDO_ENA1_2, 3, 300000, ldo3_17_volt_table),
PM800_LDO(ldo13, LDO13, LDO_ENA1_2, 4, 300000, ldo3_17_volt_table),
PM800_LDO(ldo14, LDO14, LDO_ENA1_2, 5, 300000, ldo3_17_volt_table),
PM800_LDO(ldo15, LDO15, LDO_ENA1_2, 6, 300000, ldo3_17_volt_table),
PM800_LDO(ldo16, LDO16, LDO_ENA1_2, 7, 300000, ldo3_17_volt_table),
PM800_LDO(ldo17, LDO17, LDO_ENA1_3, 0, 300000, ldo3_17_volt_table),
PM800_LDO(ldo18, LDO18, LDO_ENA1_3, 1, 200000, ldo18_19_volt_table),
PM800_LDO(ldo19, LDO19, LDO_ENA1_3, 2, 200000, ldo18_19_volt_table),
};
static int pm800_regulator_probe(struct platform_device *pdev)
{
struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct pm80x_platform_data *pdata = dev_get_platdata(pdev->dev.parent);
struct regulator_config config = { };
struct regulator_init_data *init_data;
int i, ret;
if (pdata && pdata->num_regulators) {
unsigned int count = 0;
/* Check whether num_regulator is valid. */
for (i = 0; i < ARRAY_SIZE(pdata->regulators); i++) {
if (pdata->regulators[i])
count++;
}
if (count != pdata->num_regulators)
return -EINVAL;
}
config.dev = chip->dev;
config.regmap = chip->subchip->regmap_power;
for (i = 0; i < PM800_ID_RG_MAX; i++) {
struct regulator_dev *regulator;
if (pdata && pdata->num_regulators) {
init_data = pdata->regulators[i];
if (!init_data)
continue;
config.init_data = init_data;
}
config.driver_data = &pm800_regulator_info[i];
regulator = devm_regulator_register(&pdev->dev,
&pm800_regulator_info[i].desc, &config);
if (IS_ERR(regulator)) {
ret = PTR_ERR(regulator);
dev_err(&pdev->dev, "Failed to register %s\n",
pm800_regulator_info[i].desc.name);
return ret;
}
}
return 0;
}
static struct platform_driver pm800_regulator_driver = {
.driver = {
.name = "88pm80x-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = pm800_regulator_probe,
};
module_platform_driver(pm800_regulator_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Joseph(Yossi) Hanin <yhanin@marvell.com>");
MODULE_DESCRIPTION("Regulator Driver for Marvell 88PM800 PMIC");
MODULE_ALIAS("platform:88pm800-regulator");
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