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linux/drivers/regulator/pv88090-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

412 lines
10 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
//
// pv88090-regulator.c - Regulator device driver for PV88090
// Copyright (C) 2015 Powerventure Semiconductor Ltd.
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regmap.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/regulator/of_regulator.h>
#include "pv88090-regulator.h"
#define PV88090_MAX_REGULATORS 5
/* PV88090 REGULATOR IDs */
enum {
/* BUCKs */
PV88090_ID_BUCK1,
PV88090_ID_BUCK2,
PV88090_ID_BUCK3,
/* LDOs */
PV88090_ID_LDO1,
PV88090_ID_LDO2,
};
struct pv88090_regulator {
struct regulator_desc desc;
unsigned int conf;
unsigned int conf2;
};
struct pv88090 {
struct device *dev;
struct regmap *regmap;
struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
};
struct pv88090_buck_voltage {
int min_uV;
int max_uV;
int uV_step;
};
static const struct regmap_config pv88090_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
/* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
* Entry indexes corresponds to register values.
*/
static const unsigned int pv88090_buck1_limits[] = {
220000, 440000, 660000, 880000, 1100000, 1320000, 1540000, 1760000,
1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
};
static const unsigned int pv88090_buck23_limits[] = {
1496000, 2393000, 3291000, 4189000
};
static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
{
.min_uV = 600000,
.max_uV = 1393750,
.uV_step = 6250,
},
{
.min_uV = 1400000,
.max_uV = 2193750,
.uV_step = 6250,
},
{
.min_uV = 1250000,
.max_uV = 2837500,
.uV_step = 12500,
},
};
static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
{
struct pv88090_regulator *info = rdev_get_drvdata(rdev);
unsigned int data;
int ret, mode = 0;
ret = regmap_read(rdev->regmap, info->conf, &data);
if (ret < 0)
return ret;
switch (data & PV88090_BUCK1_MODE_MASK) {
case PV88090_BUCK_MODE_SYNC:
mode = REGULATOR_MODE_FAST;
break;
case PV88090_BUCK_MODE_AUTO:
mode = REGULATOR_MODE_NORMAL;
break;
case PV88090_BUCK_MODE_SLEEP:
mode = REGULATOR_MODE_STANDBY;
break;
}
return mode;
}
static int pv88090_buck_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct pv88090_regulator *info = rdev_get_drvdata(rdev);
int val = 0;
switch (mode) {
case REGULATOR_MODE_FAST:
val = PV88090_BUCK_MODE_SYNC;
break;
case REGULATOR_MODE_NORMAL:
val = PV88090_BUCK_MODE_AUTO;
break;
case REGULATOR_MODE_STANDBY:
val = PV88090_BUCK_MODE_SLEEP;
break;
default:
return -EINVAL;
}
return regmap_update_bits(rdev->regmap, info->conf,
PV88090_BUCK1_MODE_MASK, val);
}
static const struct regulator_ops pv88090_buck_ops = {
.get_mode = pv88090_buck_get_mode,
.set_mode = pv88090_buck_set_mode,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.set_current_limit = regulator_set_current_limit_regmap,
.get_current_limit = regulator_get_current_limit_regmap,
};
static const struct regulator_ops pv88090_ldo_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
};
#define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
{\
.desc = {\
.id = chip##_ID_##regl_name,\
.name = __stringify(chip##_##regl_name),\
.of_match = of_match_ptr(#regl_name),\
.regulators_node = of_match_ptr("regulators"),\
.type = REGULATOR_VOLTAGE,\
.owner = THIS_MODULE,\
.ops = &pv88090_buck_ops,\
.min_uV = min, \
.uV_step = step, \
.n_voltages = ((max) - (min))/(step) + 1, \
.enable_reg = PV88090_REG_##regl_name##_CONF0, \
.enable_mask = PV88090_##regl_name##_EN, \
.vsel_reg = PV88090_REG_##regl_name##_CONF0, \
.vsel_mask = PV88090_V##regl_name##_MASK, \
.curr_table = limits_array, \
.n_current_limits = ARRAY_SIZE(limits_array), \
.csel_reg = PV88090_REG_##regl_name##_CONF1, \
.csel_mask = PV88090_##regl_name##_ILIM_MASK, \
},\
.conf = PV88090_REG_##regl_name##_CONF1, \
.conf2 = PV88090_REG_##regl_name##_CONF2, \
}
#define PV88090_LDO(chip, regl_name, min, step, max) \
{\
.desc = {\
.id = chip##_ID_##regl_name,\
.name = __stringify(chip##_##regl_name),\
.of_match = of_match_ptr(#regl_name),\
.regulators_node = of_match_ptr("regulators"),\
.type = REGULATOR_VOLTAGE,\
.owner = THIS_MODULE,\
.ops = &pv88090_ldo_ops,\
.min_uV = min, \
.uV_step = step, \
.n_voltages = ((max) - (min))/(step) + 1, \
.enable_reg = PV88090_REG_##regl_name##_CONT, \
.enable_mask = PV88090_##regl_name##_EN, \
.vsel_reg = PV88090_REG_##regl_name##_CONT, \
.vsel_mask = PV88090_V##regl_name##_MASK, \
},\
}
static struct pv88090_regulator pv88090_regulator_info[] = {
PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
pv88090_buck1_limits),
PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
pv88090_buck23_limits),
PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
pv88090_buck23_limits),
PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
PV88090_LDO(PV88090, LDO2, 650000, 25000, 2225000),
};
static irqreturn_t pv88090_irq_handler(int irq, void *data)
{
struct pv88090 *chip = data;
int i, reg_val, err, ret = IRQ_NONE;
err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
if (err < 0)
goto error_i2c;
if (reg_val & PV88090_E_VDD_FLT) {
for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
if (chip->rdev[i] != NULL)
regulator_notifier_call_chain(chip->rdev[i],
REGULATOR_EVENT_UNDER_VOLTAGE,
NULL);
}
err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
PV88090_E_VDD_FLT);
if (err < 0)
goto error_i2c;
ret = IRQ_HANDLED;
}
if (reg_val & PV88090_E_OVER_TEMP) {
for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
if (chip->rdev[i] != NULL)
regulator_notifier_call_chain(chip->rdev[i],
REGULATOR_EVENT_OVER_TEMP,
NULL);
}
err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
PV88090_E_OVER_TEMP);
if (err < 0)
goto error_i2c;
ret = IRQ_HANDLED;
}
return ret;
error_i2c:
dev_err(chip->dev, "I2C error : %d\n", err);
return IRQ_NONE;
}
/*
* I2C driver interface functions
*/
static int pv88090_i2c_probe(struct i2c_client *i2c)
{
struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
struct pv88090 *chip;
struct regulator_config config = { };
int error, i, ret = 0;
unsigned int conf2, range, index;
chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->dev = &i2c->dev;
chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
if (IS_ERR(chip->regmap)) {
error = PTR_ERR(chip->regmap);
dev_err(chip->dev, "Failed to allocate register map: %d\n",
error);
return error;
}
i2c_set_clientdata(i2c, chip);
if (i2c->irq != 0) {
ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
if (ret < 0) {
dev_err(chip->dev,
"Failed to mask A reg: %d\n", ret);
return ret;
}
ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
if (ret < 0) {
dev_err(chip->dev,
"Failed to mask B reg: %d\n", ret);
return ret;
}
ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
pv88090_irq_handler,
IRQF_TRIGGER_LOW|IRQF_ONESHOT,
"pv88090", chip);
if (ret != 0) {
dev_err(chip->dev, "Failed to request IRQ: %d\n",
i2c->irq);
return ret;
}
ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
if (ret < 0) {
dev_err(chip->dev,
"Failed to update mask reg: %d\n", ret);
return ret;
}
} else {
dev_warn(chip->dev, "No IRQ configured\n");
}
config.dev = chip->dev;
config.regmap = chip->regmap;
for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
if (init_data)
config.init_data = &init_data[i];
if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
ret = regmap_read(chip->regmap,
pv88090_regulator_info[i].conf2, &conf2);
if (ret < 0)
return ret;
conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
PV88090_BUCK_VDAC_RANGE_MASK;
ret = regmap_read(chip->regmap,
PV88090_REG_BUCK_FOLD_RANGE, &range);
if (ret < 0)
return ret;
range = (range >>
(PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
PV88090_BUCK_VRANGE_GAIN_MASK;
index = ((range << 1) | conf2);
if (index > PV88090_ID_BUCK3) {
dev_err(chip->dev,
"Invalid index(%d)\n", index);
return -EINVAL;
}
pv88090_regulator_info[i].desc.min_uV
= pv88090_buck_vol[index].min_uV;
pv88090_regulator_info[i].desc.uV_step
= pv88090_buck_vol[index].uV_step;
pv88090_regulator_info[i].desc.n_voltages
= ((pv88090_buck_vol[index].max_uV)
- (pv88090_buck_vol[index].min_uV))
/(pv88090_buck_vol[index].uV_step) + 1;
}
config.driver_data = (void *)&pv88090_regulator_info[i];
chip->rdev[i] = devm_regulator_register(chip->dev,
&pv88090_regulator_info[i].desc, &config);
if (IS_ERR(chip->rdev[i])) {
dev_err(chip->dev,
"Failed to register PV88090 regulator\n");
return PTR_ERR(chip->rdev[i]);
}
}
return 0;
}
static const struct i2c_device_id pv88090_i2c_id[] = {
{"pv88090", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
#ifdef CONFIG_OF
static const struct of_device_id pv88090_dt_ids[] = {
{ .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
{},
};
MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
#endif
static struct i2c_driver pv88090_regulator_driver = {
.driver = {
.name = "pv88090",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(pv88090_dt_ids),
},
.probe_new = pv88090_i2c_probe,
.id_table = pv88090_i2c_id,
};
module_i2c_driver(pv88090_regulator_driver);
MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
MODULE_LICENSE("GPL");
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