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linux/drivers/regulator/wm831x-ldo.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+
//
// wm831x-ldo.c -- LDO driver for the WM831x series
//
// Copyright 2009 Wolfson Microelectronics PLC.
//
// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>
#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/regulator.h>
#include <linux/mfd/wm831x/pdata.h>
#define WM831X_LDO_MAX_NAME 9
#define WM831X_LDO_CONTROL 0
#define WM831X_LDO_ON_CONTROL 1
#define WM831X_LDO_SLEEP_CONTROL 2
#define WM831X_ALIVE_LDO_ON_CONTROL 0
#define WM831X_ALIVE_LDO_SLEEP_CONTROL 1
struct wm831x_ldo {
char name[WM831X_LDO_MAX_NAME];
char supply_name[WM831X_LDO_MAX_NAME];
struct regulator_desc desc;
int base;
struct wm831x *wm831x;
struct regulator_dev *regulator;
};
/*
* Shared
*/
static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
{
struct wm831x_ldo *ldo = data;
regulator_notifier_call_chain(ldo->regulator,
REGULATOR_EVENT_UNDER_VOLTAGE,
NULL);
return IRQ_HANDLED;
}
/*
* General purpose LDOs
*/
static const struct linear_range wm831x_gp_ldo_ranges[] = {
REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
};
static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
int uV)
{
struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
struct wm831x *wm831x = ldo->wm831x;
int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
sel = regulator_map_voltage_linear_range(rdev, uV, uV);
if (sel < 0)
return sel;
return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, sel);
}
static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
{
struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
struct wm831x *wm831x = ldo->wm831x;
int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
int ret;
ret = wm831x_reg_read(wm831x, on_reg);
if (ret < 0)
return ret;
if (!(ret & WM831X_LDO1_ON_MODE))
return REGULATOR_MODE_NORMAL;
ret = wm831x_reg_read(wm831x, ctrl_reg);
if (ret < 0)
return ret;
if (ret & WM831X_LDO1_LP_MODE)
return REGULATOR_MODE_STANDBY;
else
return REGULATOR_MODE_IDLE;
}
static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
struct wm831x *wm831x = ldo->wm831x;
int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
int ret;
switch (mode) {
case REGULATOR_MODE_NORMAL:
ret = wm831x_set_bits(wm831x, on_reg,
WM831X_LDO1_ON_MODE, 0);
if (ret < 0)
return ret;
break;
case REGULATOR_MODE_IDLE:
ret = wm831x_set_bits(wm831x, ctrl_reg,
WM831X_LDO1_LP_MODE, 0);
if (ret < 0)
return ret;
ret = wm831x_set_bits(wm831x, on_reg,
WM831X_LDO1_ON_MODE,
WM831X_LDO1_ON_MODE);
if (ret < 0)
return ret;
break;
case REGULATOR_MODE_STANDBY:
ret = wm831x_set_bits(wm831x, ctrl_reg,
WM831X_LDO1_LP_MODE,
WM831X_LDO1_LP_MODE);
if (ret < 0)
return ret;
ret = wm831x_set_bits(wm831x, on_reg,
WM831X_LDO1_ON_MODE,
WM831X_LDO1_ON_MODE);
if (ret < 0)
return ret;
break;
default:
return -EINVAL;
}
return 0;
}
static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
{
struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
struct wm831x *wm831x = ldo->wm831x;
int mask = 1 << rdev_get_id(rdev);
int ret;
/* Is the regulator on? */
ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
if (ret < 0)
return ret;
if (!(ret & mask))
return REGULATOR_STATUS_OFF;
/* Is it reporting under voltage? */
ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
if (ret < 0)
return ret;
if (ret & mask)
return REGULATOR_STATUS_ERROR;
ret = wm831x_gp_ldo_get_mode(rdev);
if (ret < 0)
return ret;
else
return regulator_mode_to_status(ret);
}
static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
int input_uV,
int output_uV, int load_uA)
{
if (load_uA < 20000)
return REGULATOR_MODE_STANDBY;
if (load_uA < 50000)
return REGULATOR_MODE_IDLE;
return REGULATOR_MODE_NORMAL;
}
static const struct regulator_ops wm831x_gp_ldo_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
.get_mode = wm831x_gp_ldo_get_mode,
.set_mode = wm831x_gp_ldo_set_mode,
.get_status = wm831x_gp_ldo_get_status,
.get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
.get_bypass = regulator_get_bypass_regmap,
.set_bypass = regulator_set_bypass_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
};
static int wm831x_gp_ldo_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
struct regulator_config config = { };
int id;
struct wm831x_ldo *ldo;
struct resource *res;
int ret, irq;
if (pdata && pdata->wm831x_num)
id = (pdata->wm831x_num * 10) + 1;
else
id = 0;
id = pdev->id - id;
dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
if (!ldo)
return -ENOMEM;
ldo->wm831x = wm831x;
res = platform_get_resource(pdev, IORESOURCE_REG, 0);
if (res == NULL) {
dev_err(&pdev->dev, "No REG resource\n");
ret = -EINVAL;
goto err;
}
ldo->base = res->start;
snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
ldo->desc.name = ldo->name;
snprintf(ldo->supply_name, sizeof(ldo->supply_name),
"LDO%dVDD", id + 1);
ldo->desc.supply_name = ldo->supply_name;
ldo->desc.id = id;
ldo->desc.type = REGULATOR_VOLTAGE;
ldo->desc.n_voltages = 32;
ldo->desc.ops = &wm831x_gp_ldo_ops;
ldo->desc.owner = THIS_MODULE;
ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
ldo->desc.enable_reg = WM831X_LDO_ENABLE;
ldo->desc.enable_mask = 1 << id;
ldo->desc.bypass_reg = ldo->base;
ldo->desc.bypass_mask = WM831X_LDO1_SWI;
ldo->desc.linear_ranges = wm831x_gp_ldo_ranges;
ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_gp_ldo_ranges);
config.dev = pdev->dev.parent;
if (pdata)
config.init_data = pdata->ldo[id];
config.driver_data = ldo;
config.regmap = wm831x->regmap;
ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
&config);
if (IS_ERR(ldo->regulator)) {
ret = PTR_ERR(ldo->regulator);
dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
id + 1, ret);
goto err;
}
irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
wm831x_ldo_uv_irq,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
ldo->name,
ldo);
if (ret != 0) {
dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
irq, ret);
goto err;
}
platform_set_drvdata(pdev, ldo);
return 0;
err:
return ret;
}
static struct platform_driver wm831x_gp_ldo_driver = {
.probe = wm831x_gp_ldo_probe,
.driver = {
.name = "wm831x-ldo",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
/*
* Analogue LDOs
*/
static const struct linear_range wm831x_aldo_ranges[] = {
REGULATOR_LINEAR_RANGE(1000000, 0, 12, 50000),
REGULATOR_LINEAR_RANGE(1700000, 13, 31, 100000),
};
static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
int uV)
{
struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
struct wm831x *wm831x = ldo->wm831x;
int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
sel = regulator_map_voltage_linear_range(rdev, uV, uV);
if (sel < 0)
return sel;
return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel);
}
static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
{
struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
struct wm831x *wm831x = ldo->wm831x;
int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
int ret;
ret = wm831x_reg_read(wm831x, on_reg);
if (ret < 0)
return 0;
if (ret & WM831X_LDO7_ON_MODE)
return REGULATOR_MODE_IDLE;
else
return REGULATOR_MODE_NORMAL;
}
static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
struct wm831x *wm831x = ldo->wm831x;
int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
int ret;
switch (mode) {
case REGULATOR_MODE_NORMAL:
ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
if (ret < 0)
return ret;
break;
case REGULATOR_MODE_IDLE:
ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
WM831X_LDO7_ON_MODE);
if (ret < 0)
return ret;
break;
default:
return -EINVAL;
}
return 0;
}
static int wm831x_aldo_get_status(struct regulator_dev *rdev)
{
struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
struct wm831x *wm831x = ldo->wm831x;
int mask = 1 << rdev_get_id(rdev);
int ret;
/* Is the regulator on? */
ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
if (ret < 0)
return ret;
if (!(ret & mask))
return REGULATOR_STATUS_OFF;
/* Is it reporting under voltage? */
ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
if (ret < 0)
return ret;
if (ret & mask)
return REGULATOR_STATUS_ERROR;
ret = wm831x_aldo_get_mode(rdev);
if (ret < 0)
return ret;
else
return regulator_mode_to_status(ret);
}
static const struct regulator_ops wm831x_aldo_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
.get_mode = wm831x_aldo_get_mode,
.set_mode = wm831x_aldo_set_mode,
.get_status = wm831x_aldo_get_status,
.set_bypass = regulator_set_bypass_regmap,
.get_bypass = regulator_get_bypass_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
};
static int wm831x_aldo_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
struct regulator_config config = { };
int id;
struct wm831x_ldo *ldo;
struct resource *res;
int ret, irq;
if (pdata && pdata->wm831x_num)
id = (pdata->wm831x_num * 10) + 1;
else
id = 0;
id = pdev->id - id;
dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
if (!ldo)
return -ENOMEM;
ldo->wm831x = wm831x;
res = platform_get_resource(pdev, IORESOURCE_REG, 0);
if (res == NULL) {
dev_err(&pdev->dev, "No REG resource\n");
ret = -EINVAL;
goto err;
}
ldo->base = res->start;
snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
ldo->desc.name = ldo->name;
snprintf(ldo->supply_name, sizeof(ldo->supply_name),
"LDO%dVDD", id + 1);
ldo->desc.supply_name = ldo->supply_name;
ldo->desc.id = id;
ldo->desc.type = REGULATOR_VOLTAGE;
ldo->desc.n_voltages = 32;
ldo->desc.linear_ranges = wm831x_aldo_ranges;
ldo->desc.n_linear_ranges = ARRAY_SIZE(wm831x_aldo_ranges);
ldo->desc.ops = &wm831x_aldo_ops;
ldo->desc.owner = THIS_MODULE;
ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
ldo->desc.enable_reg = WM831X_LDO_ENABLE;
ldo->desc.enable_mask = 1 << id;
ldo->desc.bypass_reg = ldo->base;
ldo->desc.bypass_mask = WM831X_LDO7_SWI;
config.dev = pdev->dev.parent;
if (pdata)
config.init_data = pdata->ldo[id];
config.driver_data = ldo;
config.regmap = wm831x->regmap;
ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
&config);
if (IS_ERR(ldo->regulator)) {
ret = PTR_ERR(ldo->regulator);
dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
id + 1, ret);
goto err;
}
irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
wm831x_ldo_uv_irq,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
ldo->name, ldo);
if (ret != 0) {
dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
irq, ret);
goto err;
}
platform_set_drvdata(pdev, ldo);
return 0;
err:
return ret;
}
static struct platform_driver wm831x_aldo_driver = {
.probe = wm831x_aldo_probe,
.driver = {
.name = "wm831x-aldo",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
/*
* Alive LDO
*/
#define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
int uV)
{
struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
struct wm831x *wm831x = ldo->wm831x;
int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
sel = regulator_map_voltage_linear(rdev, uV, uV);
if (sel < 0)
return sel;
return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel);
}
static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
{
struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
struct wm831x *wm831x = ldo->wm831x;
int mask = 1 << rdev_get_id(rdev);
int ret;
/* Is the regulator on? */
ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
if (ret < 0)
return ret;
if (ret & mask)
return REGULATOR_STATUS_ON;
else
return REGULATOR_STATUS_OFF;
}
static const struct regulator_ops wm831x_alive_ldo_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
.get_status = wm831x_alive_ldo_get_status,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
};
static int wm831x_alive_ldo_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
struct regulator_config config = { };
int id;
struct wm831x_ldo *ldo;
struct resource *res;
int ret;
if (pdata && pdata->wm831x_num)
id = (pdata->wm831x_num * 10) + 1;
else
id = 0;
id = pdev->id - id;
dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
if (!ldo)
return -ENOMEM;
ldo->wm831x = wm831x;
res = platform_get_resource(pdev, IORESOURCE_REG, 0);
if (res == NULL) {
dev_err(&pdev->dev, "No REG resource\n");
ret = -EINVAL;
goto err;
}
ldo->base = res->start;
snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
ldo->desc.name = ldo->name;
snprintf(ldo->supply_name, sizeof(ldo->supply_name),
"LDO%dVDD", id + 1);
ldo->desc.supply_name = ldo->supply_name;
ldo->desc.id = id;
ldo->desc.type = REGULATOR_VOLTAGE;
ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
ldo->desc.ops = &wm831x_alive_ldo_ops;
ldo->desc.owner = THIS_MODULE;
ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
ldo->desc.enable_reg = WM831X_LDO_ENABLE;
ldo->desc.enable_mask = 1 << id;
ldo->desc.min_uV = 800000;
ldo->desc.uV_step = 50000;
ldo->desc.enable_time = 1000;
config.dev = pdev->dev.parent;
if (pdata)
config.init_data = pdata->ldo[id];
config.driver_data = ldo;
config.regmap = wm831x->regmap;
ldo->regulator = devm_regulator_register(&pdev->dev, &ldo->desc,
&config);
if (IS_ERR(ldo->regulator)) {
ret = PTR_ERR(ldo->regulator);
dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
id + 1, ret);
goto err;
}
platform_set_drvdata(pdev, ldo);
return 0;
err:
return ret;
}
static struct platform_driver wm831x_alive_ldo_driver = {
.probe = wm831x_alive_ldo_probe,
.driver = {
.name = "wm831x-alive-ldo",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
static struct platform_driver * const drivers[] = {
&wm831x_gp_ldo_driver,
&wm831x_aldo_driver,
&wm831x_alive_ldo_driver,
};
static int __init wm831x_ldo_init(void)
{
return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
}
subsys_initcall(wm831x_ldo_init);
static void __exit wm831x_ldo_exit(void)
{
platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
}
module_exit(wm831x_ldo_exit);
/* Module information */
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM831x LDO driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-ldo");
MODULE_ALIAS("platform:wm831x-aldo");
MODULE_ALIAS("platform:wm831x-aliveldo");
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