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linux-next/drivers/regulator/tps6586x-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

544 lines
16 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Regulator driver for TI TPS6586x
*
* Copyright (C) 2010 Compulab Ltd.
* Author: Mike Rapoport <mike@compulab.co.il>
*
* Based on da903x
* Copyright (C) 2006-2008 Marvell International Ltd.
* Copyright (C) 2008 Compulab Ltd.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/tps6586x.h>
/* supply control and voltage setting */
#define TPS6586X_SUPPLYENA 0x10
#define TPS6586X_SUPPLYENB 0x11
#define TPS6586X_SUPPLYENC 0x12
#define TPS6586X_SUPPLYEND 0x13
#define TPS6586X_SUPPLYENE 0x14
#define TPS6586X_VCC1 0x20
#define TPS6586X_VCC2 0x21
#define TPS6586X_SM1V1 0x23
#define TPS6586X_SM1V2 0x24
#define TPS6586X_SM1SL 0x25
#define TPS6586X_SM0V1 0x26
#define TPS6586X_SM0V2 0x27
#define TPS6586X_SM0SL 0x28
#define TPS6586X_LDO2AV1 0x29
#define TPS6586X_LDO2AV2 0x2A
#define TPS6586X_LDO2BV1 0x2F
#define TPS6586X_LDO2BV2 0x30
#define TPS6586X_LDO4V1 0x32
#define TPS6586X_LDO4V2 0x33
/* converter settings */
#define TPS6586X_SUPPLYV1 0x41
#define TPS6586X_SUPPLYV2 0x42
#define TPS6586X_SUPPLYV3 0x43
#define TPS6586X_SUPPLYV4 0x44
#define TPS6586X_SUPPLYV5 0x45
#define TPS6586X_SUPPLYV6 0x46
#define TPS6586X_SMODE1 0x47
#define TPS6586X_SMODE2 0x48
struct tps6586x_regulator {
struct regulator_desc desc;
int enable_bit[2];
int enable_reg[2];
};
static const struct regulator_ops tps6586x_rw_regulator_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
};
static const struct regulator_ops tps6586x_rw_linear_regulator_ops = {
.list_voltage = regulator_list_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
};
static const struct regulator_ops tps6586x_ro_regulator_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
};
static const struct regulator_ops tps6586x_sys_regulator_ops = {
};
static const unsigned int tps6586x_ldo0_voltages[] = {
1200000, 1500000, 1800000, 2500000, 2700000, 2850000, 3100000, 3300000,
};
static const unsigned int tps6586x_ldo_voltages[] = {
1250000, 1500000, 1800000, 2500000, 2700000, 2850000, 3100000, 3300000,
};
static const unsigned int tps658640_rtc_voltages[] = {
2500000, 2850000, 3100000, 3300000,
};
#define TPS6586X_REGULATOR(_id, _ops, _pin_name, vdata, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1, goreg, gobit) \
.desc = { \
.supply_name = _pin_name, \
.name = "REG-" #_id, \
.ops = &tps6586x_## _ops ## _regulator_ops, \
.type = REGULATOR_VOLTAGE, \
.id = TPS6586X_ID_##_id, \
.n_voltages = ARRAY_SIZE(vdata##_voltages), \
.volt_table = vdata##_voltages, \
.owner = THIS_MODULE, \
.enable_reg = TPS6586X_SUPPLY##ereg0, \
.enable_mask = 1 << (ebit0), \
.vsel_reg = TPS6586X_##vreg, \
.vsel_mask = ((1 << (nbits)) - 1) << (shift), \
.apply_reg = (goreg), \
.apply_bit = (gobit), \
}, \
.enable_reg[0] = TPS6586X_SUPPLY##ereg0, \
.enable_bit[0] = (ebit0), \
.enable_reg[1] = TPS6586X_SUPPLY##ereg1, \
.enable_bit[1] = (ebit1),
#define TPS6586X_REGULATOR_LINEAR(_id, _ops, _pin_name, n_volt, min_uv, \
uv_step, vreg, shift, nbits, ereg0, \
ebit0, ereg1, ebit1, goreg, gobit) \
.desc = { \
.supply_name = _pin_name, \
.name = "REG-" #_id, \
.ops = &tps6586x_## _ops ## _regulator_ops, \
.type = REGULATOR_VOLTAGE, \
.id = TPS6586X_ID_##_id, \
.n_voltages = n_volt, \
.min_uV = min_uv, \
.uV_step = uv_step, \
.owner = THIS_MODULE, \
.enable_reg = TPS6586X_SUPPLY##ereg0, \
.enable_mask = 1 << (ebit0), \
.vsel_reg = TPS6586X_##vreg, \
.vsel_mask = ((1 << (nbits)) - 1) << (shift), \
.apply_reg = (goreg), \
.apply_bit = (gobit), \
}, \
.enable_reg[0] = TPS6586X_SUPPLY##ereg0, \
.enable_bit[0] = (ebit0), \
.enable_reg[1] = TPS6586X_SUPPLY##ereg1, \
.enable_bit[1] = (ebit1),
#define TPS6586X_LDO(_id, _pname, vdata, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1) \
{ \
TPS6586X_REGULATOR(_id, rw, _pname, vdata, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1, 0, 0) \
}
#define TPS6586X_LDO_LINEAR(_id, _pname, n_volt, min_uv, uv_step, vreg, \
shift, nbits, ereg0, ebit0, ereg1, ebit1) \
{ \
TPS6586X_REGULATOR_LINEAR(_id, rw_linear, _pname, n_volt, \
min_uv, uv_step, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1, 0, 0) \
}
#define TPS6586X_FIXED_LDO(_id, _pname, vdata, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1) \
{ \
TPS6586X_REGULATOR(_id, ro, _pname, vdata, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1, 0, 0) \
}
#define TPS6586X_DVM(_id, _pname, n_volt, min_uv, uv_step, vreg, shift, \
nbits, ereg0, ebit0, ereg1, ebit1, goreg, gobit) \
{ \
TPS6586X_REGULATOR_LINEAR(_id, rw_linear, _pname, n_volt, \
min_uv, uv_step, vreg, shift, nbits, \
ereg0, ebit0, ereg1, ebit1, goreg, \
gobit) \
}
#define TPS6586X_SYS_REGULATOR() \
{ \
.desc = { \
.supply_name = "sys", \
.name = "REG-SYS", \
.ops = &tps6586x_sys_regulator_ops, \
.type = REGULATOR_VOLTAGE, \
.id = TPS6586X_ID_SYS, \
.owner = THIS_MODULE, \
}, \
}
static struct tps6586x_regulator tps6586x_regulator[] = {
TPS6586X_SYS_REGULATOR(),
TPS6586X_LDO(LDO_0, "vinldo01", tps6586x_ldo0, SUPPLYV1, 5, 3, ENC, 0,
END, 0),
TPS6586X_LDO(LDO_3, "vinldo23", tps6586x_ldo, SUPPLYV4, 0, 3, ENC, 2,
END, 2),
TPS6586X_LDO(LDO_5, "REG-SYS", tps6586x_ldo, SUPPLYV6, 0, 3, ENE, 6,
ENE, 6),
TPS6586X_LDO(LDO_6, "vinldo678", tps6586x_ldo, SUPPLYV3, 0, 3, ENC, 4,
END, 4),
TPS6586X_LDO(LDO_7, "vinldo678", tps6586x_ldo, SUPPLYV3, 3, 3, ENC, 5,
END, 5),
TPS6586X_LDO(LDO_8, "vinldo678", tps6586x_ldo, SUPPLYV2, 5, 3, ENC, 6,
END, 6),
TPS6586X_LDO(LDO_9, "vinldo9", tps6586x_ldo, SUPPLYV6, 3, 3, ENE, 7,
ENE, 7),
TPS6586X_LDO(LDO_RTC, "REG-SYS", tps6586x_ldo, SUPPLYV4, 3, 3, V4, 7,
V4, 7),
TPS6586X_LDO_LINEAR(LDO_1, "vinldo01", 32, 725000, 25000, SUPPLYV1,
0, 5, ENC, 1, END, 1),
TPS6586X_LDO_LINEAR(SM_2, "vin-sm2", 32, 3000000, 50000, SUPPLYV2,
0, 5, ENC, 7, END, 7),
TPS6586X_DVM(LDO_2, "vinldo23", 32, 725000, 25000, LDO2BV1, 0, 5,
ENA, 3, ENB, 3, TPS6586X_VCC2, BIT(6)),
TPS6586X_DVM(LDO_4, "vinldo4", 32, 1700000, 25000, LDO4V1, 0, 5,
ENC, 3, END, 3, TPS6586X_VCC1, BIT(6)),
TPS6586X_DVM(SM_0, "vin-sm0", 32, 725000, 25000, SM0V1, 0, 5,
ENA, 1, ENB, 1, TPS6586X_VCC1, BIT(2)),
TPS6586X_DVM(SM_1, "vin-sm1", 32, 725000, 25000, SM1V1, 0, 5,
ENA, 0, ENB, 0, TPS6586X_VCC1, BIT(0)),
};
static struct tps6586x_regulator tps658623_regulator[] = {
TPS6586X_LDO_LINEAR(SM_2, "vin-sm2", 32, 1700000, 25000, SUPPLYV2,
0, 5, ENC, 7, END, 7),
};
static struct tps6586x_regulator tps658640_regulator[] = {
TPS6586X_LDO(LDO_3, "vinldo23", tps6586x_ldo0, SUPPLYV4, 0, 3,
ENC, 2, END, 2),
TPS6586X_LDO(LDO_5, "REG-SYS", tps6586x_ldo0, SUPPLYV6, 0, 3,
ENE, 6, ENE, 6),
TPS6586X_LDO(LDO_6, "vinldo678", tps6586x_ldo0, SUPPLYV3, 0, 3,
ENC, 4, END, 4),
TPS6586X_LDO(LDO_7, "vinldo678", tps6586x_ldo0, SUPPLYV3, 3, 3,
ENC, 5, END, 5),
TPS6586X_LDO(LDO_8, "vinldo678", tps6586x_ldo0, SUPPLYV2, 5, 3,
ENC, 6, END, 6),
TPS6586X_LDO(LDO_9, "vinldo9", tps6586x_ldo0, SUPPLYV6, 3, 3,
ENE, 7, ENE, 7),
TPS6586X_LDO_LINEAR(SM_2, "vin-sm2", 32, 2150000, 50000, SUPPLYV2,
0, 5, ENC, 7, END, 7),
TPS6586X_FIXED_LDO(LDO_RTC, "REG-SYS", tps658640_rtc, SUPPLYV4, 3, 2,
V4, 7, V4, 7),
};
static struct tps6586x_regulator tps658643_regulator[] = {
TPS6586X_LDO_LINEAR(SM_2, "vin-sm2", 32, 1025000, 25000, SUPPLYV2,
0, 5, ENC, 7, END, 7),
};
/*
* TPS6586X has 2 enable bits that are OR'ed to determine the actual
* regulator state. Clearing one of this bits allows switching
* regulator on and of with single register write.
*/
static inline int tps6586x_regulator_preinit(struct device *parent,
struct tps6586x_regulator *ri)
{
uint8_t val1, val2;
int ret;
if (ri->enable_reg[0] == ri->enable_reg[1] &&
ri->enable_bit[0] == ri->enable_bit[1])
return 0;
ret = tps6586x_read(parent, ri->enable_reg[0], &val1);
if (ret)
return ret;
ret = tps6586x_read(parent, ri->enable_reg[1], &val2);
if (ret)
return ret;
if (!(val2 & (1 << ri->enable_bit[1])))
return 0;
/*
* The regulator is on, but it's enabled with the bit we don't
* want to use, so we switch the enable bits
*/
if (!(val1 & (1 << ri->enable_bit[0]))) {
ret = tps6586x_set_bits(parent, ri->enable_reg[0],
1 << ri->enable_bit[0]);
if (ret)
return ret;
}
return tps6586x_clr_bits(parent, ri->enable_reg[1],
1 << ri->enable_bit[1]);
}
static int tps6586x_regulator_set_slew_rate(struct platform_device *pdev,
int id, struct regulator_init_data *p)
{
struct device *parent = pdev->dev.parent;
struct tps6586x_settings *setting = p->driver_data;
uint8_t reg;
if (setting == NULL)
return 0;
if (!(setting->slew_rate & TPS6586X_SLEW_RATE_SET))
return 0;
/* only SM0 and SM1 can have the slew rate settings */
switch (id) {
case TPS6586X_ID_SM_0:
reg = TPS6586X_SM0SL;
break;
case TPS6586X_ID_SM_1:
reg = TPS6586X_SM1SL;
break;
default:
dev_err(&pdev->dev, "Only SM0/SM1 can set slew rate\n");
return -EINVAL;
}
return tps6586x_write(parent, reg,
setting->slew_rate & TPS6586X_SLEW_RATE_MASK);
}
static struct tps6586x_regulator *find_regulator_info(int id, int version)
{
struct tps6586x_regulator *ri;
struct tps6586x_regulator *table = NULL;
int num;
int i;
switch (version) {
case TPS658623:
case TPS658624:
table = tps658623_regulator;
num = ARRAY_SIZE(tps658623_regulator);
break;
case TPS658640:
case TPS658640v2:
table = tps658640_regulator;
num = ARRAY_SIZE(tps658640_regulator);
break;
case TPS658643:
table = tps658643_regulator;
num = ARRAY_SIZE(tps658643_regulator);
break;
}
/* Search version specific table first */
if (table) {
for (i = 0; i < num; i++) {
ri = &table[i];
if (ri->desc.id == id)
return ri;
}
}
for (i = 0; i < ARRAY_SIZE(tps6586x_regulator); i++) {
ri = &tps6586x_regulator[i];
if (ri->desc.id == id)
return ri;
}
return NULL;
}
#ifdef CONFIG_OF
static struct of_regulator_match tps6586x_matches[] = {
{ .name = "sys", .driver_data = (void *)TPS6586X_ID_SYS },
{ .name = "sm0", .driver_data = (void *)TPS6586X_ID_SM_0 },
{ .name = "sm1", .driver_data = (void *)TPS6586X_ID_SM_1 },
{ .name = "sm2", .driver_data = (void *)TPS6586X_ID_SM_2 },
{ .name = "ldo0", .driver_data = (void *)TPS6586X_ID_LDO_0 },
{ .name = "ldo1", .driver_data = (void *)TPS6586X_ID_LDO_1 },
{ .name = "ldo2", .driver_data = (void *)TPS6586X_ID_LDO_2 },
{ .name = "ldo3", .driver_data = (void *)TPS6586X_ID_LDO_3 },
{ .name = "ldo4", .driver_data = (void *)TPS6586X_ID_LDO_4 },
{ .name = "ldo5", .driver_data = (void *)TPS6586X_ID_LDO_5 },
{ .name = "ldo6", .driver_data = (void *)TPS6586X_ID_LDO_6 },
{ .name = "ldo7", .driver_data = (void *)TPS6586X_ID_LDO_7 },
{ .name = "ldo8", .driver_data = (void *)TPS6586X_ID_LDO_8 },
{ .name = "ldo9", .driver_data = (void *)TPS6586X_ID_LDO_9 },
{ .name = "ldo_rtc", .driver_data = (void *)TPS6586X_ID_LDO_RTC },
};
static struct tps6586x_platform_data *tps6586x_parse_regulator_dt(
struct platform_device *pdev,
struct of_regulator_match **tps6586x_reg_matches)
{
const unsigned int num = ARRAY_SIZE(tps6586x_matches);
struct device_node *np = pdev->dev.parent->of_node;
struct device_node *regs;
const char *sys_rail = NULL;
unsigned int i;
struct tps6586x_platform_data *pdata;
int err;
regs = of_get_child_by_name(np, "regulators");
if (!regs) {
dev_err(&pdev->dev, "regulator node not found\n");
return NULL;
}
err = of_regulator_match(&pdev->dev, regs, tps6586x_matches, num);
of_node_put(regs);
if (err < 0) {
dev_err(&pdev->dev, "Regulator match failed, e %d\n", err);
return NULL;
}
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
for (i = 0; i < num; i++) {
uintptr_t id;
if (!tps6586x_matches[i].init_data)
continue;
pdata->reg_init_data[i] = tps6586x_matches[i].init_data;
id = (uintptr_t)tps6586x_matches[i].driver_data;
if (id == TPS6586X_ID_SYS)
sys_rail = pdata->reg_init_data[i]->constraints.name;
if ((id == TPS6586X_ID_LDO_5) || (id == TPS6586X_ID_LDO_RTC))
pdata->reg_init_data[i]->supply_regulator = sys_rail;
}
*tps6586x_reg_matches = tps6586x_matches;
return pdata;
}
#else
static struct tps6586x_platform_data *tps6586x_parse_regulator_dt(
struct platform_device *pdev,
struct of_regulator_match **tps6586x_reg_matches)
{
*tps6586x_reg_matches = NULL;
return NULL;
}
#endif
static int tps6586x_regulator_probe(struct platform_device *pdev)
{
struct tps6586x_regulator *ri = NULL;
struct regulator_config config = { };
struct regulator_dev *rdev;
struct regulator_init_data *reg_data;
struct tps6586x_platform_data *pdata;
struct of_regulator_match *tps6586x_reg_matches = NULL;
int version;
int id;
int err;
dev_dbg(&pdev->dev, "Probing regulator\n");
pdata = dev_get_platdata(pdev->dev.parent);
if ((!pdata) && (pdev->dev.parent->of_node))
pdata = tps6586x_parse_regulator_dt(pdev,
&tps6586x_reg_matches);
if (!pdata) {
dev_err(&pdev->dev, "Platform data not available, exiting\n");
return -ENODEV;
}
version = tps6586x_get_version(pdev->dev.parent);
for (id = 0; id < TPS6586X_ID_MAX_REGULATOR; ++id) {
reg_data = pdata->reg_init_data[id];
ri = find_regulator_info(id, version);
if (!ri) {
dev_err(&pdev->dev, "invalid regulator ID specified\n");
return -EINVAL;
}
err = tps6586x_regulator_preinit(pdev->dev.parent, ri);
if (err) {
dev_err(&pdev->dev,
"regulator %d preinit failed, e %d\n", id, err);
return err;
}
config.dev = pdev->dev.parent;
config.init_data = reg_data;
config.driver_data = ri;
if (tps6586x_reg_matches)
config.of_node = tps6586x_reg_matches[id].of_node;
rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
ri->desc.name);
return PTR_ERR(rdev);
}
if (reg_data) {
err = tps6586x_regulator_set_slew_rate(pdev, id,
reg_data);
if (err < 0) {
dev_err(&pdev->dev,
"Slew rate config failed, e %d\n", err);
return err;
}
}
}
platform_set_drvdata(pdev, rdev);
return 0;
}
static struct platform_driver tps6586x_regulator_driver = {
.driver = {
.name = "tps6586x-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = tps6586x_regulator_probe,
};
static int __init tps6586x_regulator_init(void)
{
return platform_driver_register(&tps6586x_regulator_driver);
}
subsys_initcall(tps6586x_regulator_init);
static void __exit tps6586x_regulator_exit(void)
{
platform_driver_unregister(&tps6586x_regulator_driver);
}
module_exit(tps6586x_regulator_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
MODULE_DESCRIPTION("Regulator Driver for TI TPS6586X PMIC");
MODULE_ALIAS("platform:tps6586x-regulator");
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