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linux-next/drivers/regulator/mt6380-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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// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2017 MediaTek Inc.
// Author: Chenglin Xu <chenglin.xu@mediatek.com>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/mt6380-regulator.h>
#include <linux/regulator/of_regulator.h>
/* PMIC Registers */
#define MT6380_ALDO_CON_0 0x0000
#define MT6380_BTLDO_CON_0 0x0004
#define MT6380_COMP_CON_0 0x0008
#define MT6380_CPUBUCK_CON_0 0x000C
#define MT6380_CPUBUCK_CON_1 0x0010
#define MT6380_CPUBUCK_CON_2 0x0014
#define MT6380_DDRLDO_CON_0 0x0018
#define MT6380_MLDO_CON_0 0x001C
#define MT6380_PALDO_CON_0 0x0020
#define MT6380_PHYLDO_CON_0 0x0024
#define MT6380_SIDO_CON_0 0x0028
#define MT6380_SIDO_CON_1 0x002C
#define MT6380_SIDO_CON_2 0x0030
#define MT6380_SLDO_CON_0 0x0034
#define MT6380_TLDO_CON_0 0x0038
#define MT6380_STARTUP_CON_0 0x003C
#define MT6380_STARTUP_CON_1 0x0040
#define MT6380_SMPS_TOP_CON_0 0x0044
#define MT6380_SMPS_TOP_CON_1 0x0048
#define MT6380_ANA_CTRL_0 0x0050
#define MT6380_ANA_CTRL_1 0x0054
#define MT6380_ANA_CTRL_2 0x0058
#define MT6380_ANA_CTRL_3 0x005C
#define MT6380_ANA_CTRL_4 0x0060
#define MT6380_SPK_CON9 0x0064
#define MT6380_SPK_CON11 0x0068
#define MT6380_SPK_CON12 0x006A
#define MT6380_CLK_CTRL 0x0070
#define MT6380_PINMUX_CTRL 0x0074
#define MT6380_IO_CTRL 0x0078
#define MT6380_SLP_MODE_CTRL_0 0x007C
#define MT6380_SLP_MODE_CTRL_1 0x0080
#define MT6380_SLP_MODE_CTRL_2 0x0084
#define MT6380_SLP_MODE_CTRL_3 0x0088
#define MT6380_SLP_MODE_CTRL_4 0x008C
#define MT6380_SLP_MODE_CTRL_5 0x0090
#define MT6380_SLP_MODE_CTRL_6 0x0094
#define MT6380_SLP_MODE_CTRL_7 0x0098
#define MT6380_SLP_MODE_CTRL_8 0x009C
#define MT6380_FCAL_CTRL_0 0x00A0
#define MT6380_FCAL_CTRL_1 0x00A4
#define MT6380_LDO_CTRL_0 0x00A8
#define MT6380_LDO_CTRL_1 0x00AC
#define MT6380_LDO_CTRL_2 0x00B0
#define MT6380_LDO_CTRL_3 0x00B4
#define MT6380_LDO_CTRL_4 0x00B8
#define MT6380_DEBUG_CTRL_0 0x00BC
#define MT6380_EFU_CTRL_0 0x0200
#define MT6380_EFU_CTRL_1 0x0201
#define MT6380_EFU_CTRL_2 0x0202
#define MT6380_EFU_CTRL_3 0x0203
#define MT6380_EFU_CTRL_4 0x0204
#define MT6380_EFU_CTRL_5 0x0205
#define MT6380_EFU_CTRL_6 0x0206
#define MT6380_EFU_CTRL_7 0x0207
#define MT6380_EFU_CTRL_8 0x0208
#define MT6380_REGULATOR_MODE_AUTO 0
#define MT6380_REGULATOR_MODE_FORCE_PWM 1
/*
* mt6380 regulators' information
*
* @desc: standard fields of regulator description
* @vselon_reg: Register sections for hardware control mode of bucks
* @modeset_reg: Register for controlling the buck/LDO control mode
* @modeset_mask: Mask for controlling the buck/LDO control mode
*/
struct mt6380_regulator_info {
struct regulator_desc desc;
u32 vselon_reg;
u32 modeset_reg;
u32 modeset_mask;
};
#define MT6380_BUCK(match, vreg, min, max, step, volt_ranges, enreg, \
vosel, vosel_mask, enbit, voselon, _modeset_reg, \
_modeset_mask) \
[MT6380_ID_##vreg] = { \
.desc = { \
.name = #vreg, \
.of_match = of_match_ptr(match), \
.ops = &mt6380_volt_range_ops, \
.type = REGULATOR_VOLTAGE, \
.id = MT6380_ID_##vreg, \
.owner = THIS_MODULE, \
.n_voltages = ((max) - (min)) / (step) + 1, \
.linear_ranges = volt_ranges, \
.n_linear_ranges = ARRAY_SIZE(volt_ranges), \
.vsel_reg = vosel, \
.vsel_mask = vosel_mask, \
.enable_reg = enreg, \
.enable_mask = BIT(enbit), \
}, \
.vselon_reg = voselon, \
.modeset_reg = _modeset_reg, \
.modeset_mask = _modeset_mask, \
}
#define MT6380_LDO(match, vreg, ldo_volt_table, enreg, enbit, vosel, \
vosel_mask, _modeset_reg, _modeset_mask) \
[MT6380_ID_##vreg] = { \
.desc = { \
.name = #vreg, \
.of_match = of_match_ptr(match), \
.ops = &mt6380_volt_table_ops, \
.type = REGULATOR_VOLTAGE, \
.id = MT6380_ID_##vreg, \
.owner = THIS_MODULE, \
.n_voltages = ARRAY_SIZE(ldo_volt_table), \
.volt_table = ldo_volt_table, \
.vsel_reg = vosel, \
.vsel_mask = vosel_mask, \
.enable_reg = enreg, \
.enable_mask = BIT(enbit), \
}, \
.modeset_reg = _modeset_reg, \
.modeset_mask = _modeset_mask, \
}
#define MT6380_REG_FIXED(match, vreg, enreg, enbit, volt, \
_modeset_reg, _modeset_mask) \
[MT6380_ID_##vreg] = { \
.desc = { \
.name = #vreg, \
.of_match = of_match_ptr(match), \
.ops = &mt6380_volt_fixed_ops, \
.type = REGULATOR_VOLTAGE, \
.id = MT6380_ID_##vreg, \
.owner = THIS_MODULE, \
.n_voltages = 1, \
.enable_reg = enreg, \
.enable_mask = BIT(enbit), \
.min_uV = volt, \
}, \
.modeset_reg = _modeset_reg, \
.modeset_mask = _modeset_mask, \
}
static const struct linear_range buck_volt_range1[] = {
REGULATOR_LINEAR_RANGE(600000, 0, 0xfe, 6250),
};
static const struct linear_range buck_volt_range2[] = {
REGULATOR_LINEAR_RANGE(600000, 0, 0xfe, 6250),
};
static const struct linear_range buck_volt_range3[] = {
REGULATOR_LINEAR_RANGE(1200000, 0, 0x3c, 25000),
};
static const unsigned int ldo_volt_table1[] = {
1400000, 1350000, 1300000, 1250000, 1200000, 1150000, 1100000, 1050000,
};
static const unsigned int ldo_volt_table2[] = {
2200000, 3300000,
};
static const unsigned int ldo_volt_table3[] = {
1240000, 1390000, 1540000, 1840000,
};
static const unsigned int ldo_volt_table4[] = {
2200000, 3300000,
};
static int mt6380_regulator_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
int val = 0;
struct mt6380_regulator_info *info = rdev_get_drvdata(rdev);
switch (mode) {
case REGULATOR_MODE_NORMAL:
val = MT6380_REGULATOR_MODE_AUTO;
break;
case REGULATOR_MODE_FAST:
val = MT6380_REGULATOR_MODE_FORCE_PWM;
break;
default:
return -EINVAL;
}
val <<= ffs(info->modeset_mask) - 1;
return regmap_update_bits(rdev->regmap, info->modeset_reg,
info->modeset_mask, val);
}
static unsigned int mt6380_regulator_get_mode(struct regulator_dev *rdev)
{
unsigned int val;
unsigned int mode;
int ret;
struct mt6380_regulator_info *info = rdev_get_drvdata(rdev);
ret = regmap_read(rdev->regmap, info->modeset_reg, &val);
if (ret < 0)
return ret;
val &= info->modeset_mask;
val >>= ffs(info->modeset_mask) - 1;
switch (val) {
case MT6380_REGULATOR_MODE_AUTO:
mode = REGULATOR_MODE_NORMAL;
break;
case MT6380_REGULATOR_MODE_FORCE_PWM:
mode = REGULATOR_MODE_FAST;
break;
default:
return -EINVAL;
}
return mode;
}
static const struct regulator_ops mt6380_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,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = mt6380_regulator_set_mode,
.get_mode = mt6380_regulator_get_mode,
};
static const struct regulator_ops mt6380_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,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = mt6380_regulator_set_mode,
.get_mode = mt6380_regulator_get_mode,
};
static const struct regulator_ops mt6380_volt_fixed_ops = {
.list_voltage = regulator_list_voltage_linear,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = mt6380_regulator_set_mode,
.get_mode = mt6380_regulator_get_mode,
};
/* The array is indexed by id(MT6380_ID_XXX) */
static struct mt6380_regulator_info mt6380_regulators[] = {
MT6380_BUCK("buck-vcore1", VCPU, 600000, 1393750, 6250,
buck_volt_range1, MT6380_ANA_CTRL_3, MT6380_ANA_CTRL_1,
0xfe, 3, MT6380_ANA_CTRL_1,
MT6380_CPUBUCK_CON_0, 0x8000000),
MT6380_BUCK("buck-vcore", VCORE, 600000, 1393750, 6250,
buck_volt_range2, MT6380_ANA_CTRL_3, MT6380_ANA_CTRL_2,
0xfe, 2, MT6380_ANA_CTRL_2, MT6380_SIDO_CON_0, 0x1000000),
MT6380_BUCK("buck-vrf", VRF, 1200000, 1575000, 25000,
buck_volt_range3, MT6380_ANA_CTRL_3, MT6380_SIDO_CON_0,
0x78, 1, MT6380_SIDO_CON_0, MT6380_SIDO_CON_0, 0x8000),
MT6380_LDO("ldo-vm", VMLDO, ldo_volt_table1, MT6380_LDO_CTRL_0,
1, MT6380_MLDO_CON_0, 0xE000, MT6380_ANA_CTRL_1, 0x4000000),
MT6380_LDO("ldo-va", VALDO, ldo_volt_table2, MT6380_LDO_CTRL_0,
2, MT6380_ALDO_CON_0, 0x400, MT6380_ALDO_CON_0, 0x20),
MT6380_REG_FIXED("ldo-vphy", VPHYLDO, MT6380_LDO_CTRL_0, 7, 1800000,
MT6380_PHYLDO_CON_0, 0x80),
MT6380_LDO("ldo-vddr", VDDRLDO, ldo_volt_table3, MT6380_LDO_CTRL_0,
8, MT6380_DDRLDO_CON_0, 0x3000, MT6380_DDRLDO_CON_0, 0x80),
MT6380_LDO("ldo-vt", VTLDO, ldo_volt_table4, MT6380_LDO_CTRL_0, 3,
MT6380_TLDO_CON_0, 0x400, MT6380_TLDO_CON_0, 0x20),
};
static int mt6380_regulator_probe(struct platform_device *pdev)
{
struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL);
struct regulator_config config = {};
struct regulator_dev *rdev;
int i;
for (i = 0; i < MT6380_MAX_REGULATOR; i++) {
config.dev = &pdev->dev;
config.driver_data = &mt6380_regulators[i];
config.regmap = regmap;
rdev = devm_regulator_register(&pdev->dev,
&mt6380_regulators[i].desc,
&config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register %s\n",
mt6380_regulators[i].desc.name);
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct platform_device_id mt6380_platform_ids[] = {
{"mt6380-regulator", 0},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(platform, mt6380_platform_ids);
static const struct of_device_id __maybe_unused mt6380_of_match[] = {
{ .compatible = "mediatek,mt6380-regulator", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, mt6380_of_match);
static struct platform_driver mt6380_regulator_driver = {
.driver = {
.name = "mt6380-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(mt6380_of_match),
},
.probe = mt6380_regulator_probe,
.id_table = mt6380_platform_ids,
};
module_platform_driver(mt6380_regulator_driver);
MODULE_AUTHOR("Chenglin Xu <chenglin.xu@mediatek.com>");
MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6380 PMIC");
MODULE_LICENSE("GPL v2");
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