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regulator: act8945a-regulator: Implement PM functionalities 

The regulator supports a dedicated suspend mode.
Implement the appropriate ->set_suspend_xx() hooks, add support for
->set_mode(), and provide basic PM ops functionalities to setup the
regulator in a suspend state when the system is entering suspend.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
[claudiu.beznea@microchip.com: remove shutdown function, use dev_pm_ops,
 fix checkpatch warning, adapt commit message, add LDO modes support,
 move modes constants to active-semi,8945a-regulator.h, remove rdevs from
 struct act8945a_pmic, add op_mode to act8945a_pmic]
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Boris Brezillon 2018-12-11 15:56:41 +00:00 committed by Mark Brown
parent 90bc8ac220
commit 7482d6ecc6
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 211 additions and 5 deletions
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186
drivers/regulator/act8945a-regulator.c
View File

@ -18,6 +18,7 @@
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <dt-bindings/regulator/active-semi,8945a-regulator.h>
/**
* ACT8945A Global Register Map.
@ -28,20 +29,27 @@
#define ACT8945A_DCDC1_VSET1 0x20
#define ACT8945A_DCDC1_VSET2 0x21
#define ACT8945A_DCDC1_CTRL 0x22
#define ACT8945A_DCDC1_SUS 0x24
#define ACT8945A_DCDC2_VSET1 0x30
#define ACT8945A_DCDC2_VSET2 0x31
#define ACT8945A_DCDC2_CTRL 0x32
#define ACT8945A_DCDC2_SUS 0x34
#define ACT8945A_DCDC3_VSET1 0x40
#define ACT8945A_DCDC3_VSET2 0x41
#define ACT8945A_DCDC3_CTRL 0x42
#define ACT8945A_DCDC3_SUS 0x44
#define ACT8945A_LDO1_VSET 0x50
#define ACT8945A_LDO1_CTRL 0x51
#define ACT8945A_LDO1_SUS 0x52
#define ACT8945A_LDO2_VSET 0x54
#define ACT8945A_LDO2_CTRL 0x55
#define ACT8945A_LDO2_SUS 0x56
#define ACT8945A_LDO3_VSET 0x60
#define ACT8945A_LDO3_CTRL 0x61
#define ACT8945A_LDO3_SUS 0x62
#define ACT8945A_LDO4_VSET 0x64
#define ACT8945A_LDO4_CTRL 0x65
#define ACT8945A_LDO4_SUS 0x66
/**
* Field Definitions.
@ -62,7 +70,12 @@ enum {
ACT8945A_ID_LDO2,
ACT8945A_ID_LDO3,
ACT8945A_ID_LDO4,
ACT8945A_REG_NUM,
ACT8945A_ID_MAX,
};
struct act8945a_pmic {
struct regmap *regmap;
u32 op_mode[ACT8945A_ID_MAX];
};
static const struct regulator_linear_range act8945a_voltage_ranges[] = {
@ -71,6 +84,143 @@ static const struct regulator_linear_range act8945a_voltage_ranges[] = {
REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
};
static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable)
{
struct regmap *regmap = rdev->regmap;
int id = rdev->desc->id, reg, val;
switch (id) {
case ACT8945A_ID_DCDC1:
reg = ACT8945A_DCDC1_SUS;
val = 0xa8;
break;
case ACT8945A_ID_DCDC2:
reg = ACT8945A_DCDC2_SUS;
val = 0xa8;
break;
case ACT8945A_ID_DCDC3:
reg = ACT8945A_DCDC3_SUS;
val = 0xa8;
break;
case ACT8945A_ID_LDO1:
reg = ACT8945A_LDO1_SUS;
val = 0xe8;
break;
case ACT8945A_ID_LDO2:
reg = ACT8945A_LDO2_SUS;
val = 0xe8;
break;
case ACT8945A_ID_LDO3:
reg = ACT8945A_LDO3_SUS;
val = 0xe8;
break;
case ACT8945A_ID_LDO4:
reg = ACT8945A_LDO4_SUS;
val = 0xe8;
break;
default:
return -EINVAL;
}
if (enable)
val |= BIT(4);
/*
* Ask the PMIC to enable/disable this output when entering hibernate
* mode.
*/
return regmap_write(regmap, reg, val);
}
static int act8945a_set_suspend_enable(struct regulator_dev *rdev)
{
return act8945a_set_suspend_state(rdev, true);
}
static int act8945a_set_suspend_disable(struct regulator_dev *rdev)
{
return act8945a_set_suspend_state(rdev, false);
}
static unsigned int act8945a_of_map_mode(unsigned int mode)
{
switch (mode) {
case ACT8945A_REGULATOR_MODE_FIXED:
case ACT8945A_REGULATOR_MODE_NORMAL:
return REGULATOR_MODE_NORMAL;
case ACT8945A_REGULATOR_MODE_LOWPOWER:
return REGULATOR_MODE_STANDBY;
default:
return REGULATOR_MODE_INVALID;
}
}
static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
struct regmap *regmap = rdev->regmap;
int id = rdev->desc->id;
int reg, ret, val = 0;
switch (id) {
case ACT8945A_ID_DCDC1:
reg = ACT8945A_DCDC1_CTRL;
break;
case ACT8945A_ID_DCDC2:
reg = ACT8945A_DCDC2_CTRL;
break;
case ACT8945A_ID_DCDC3:
reg = ACT8945A_DCDC3_CTRL;
break;
case ACT8945A_ID_LDO1:
reg = ACT8945A_LDO1_SUS;
break;
case ACT8945A_ID_LDO2:
reg = ACT8945A_LDO2_SUS;
break;
case ACT8945A_ID_LDO3:
reg = ACT8945A_LDO3_SUS;
break;
case ACT8945A_ID_LDO4:
reg = ACT8945A_LDO4_SUS;
break;
default:
return -EINVAL;
}
switch (mode) {
case REGULATOR_MODE_STANDBY:
if (rdev->desc->id > ACT8945A_ID_DCDC3)
val = BIT(5);
break;
case REGULATOR_MODE_NORMAL:
if (rdev->desc->id <= ACT8945A_ID_DCDC3)
val = BIT(5);
break;
default:
return -EINVAL;
}
ret = regmap_update_bits(regmap, reg, BIT(5), val);
if (ret)
return ret;
act8945a->op_mode[id] = mode;
return 0;
}
static unsigned int act8945a_get_mode(struct regulator_dev *rdev)
{
struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
int id = rdev->desc->id;
if (id < ACT8945A_ID_DCDC1 || id >= ACT8945A_ID_MAX)
return -EINVAL;
return act8945a->op_mode[id];
}
static const struct regulator_ops act8945a_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
@ -78,7 +228,11 @@ static const struct regulator_ops act8945a_ops = {
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.set_mode = act8945a_set_mode,
.get_mode = act8945a_get_mode,
.is_enabled = regulator_is_enabled_regmap,
.set_suspend_enable = act8945a_set_suspend_enable,
.set_suspend_disable = act8945a_set_suspend_disable,
};
#define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply) \
@ -86,6 +240,7 @@ static const struct regulator_ops act8945a_ops = {
.name = _name, \
.supply_name = _supply, \
.of_match = of_match_ptr("REG_"#_id), \
.of_map_mode = act8945a_of_map_mode, \
.regulators_node = of_match_ptr("regulators"), \
.id = _family##_ID_##_id, \
.type = REGULATOR_VOLTAGE, \
@ -124,13 +279,17 @@ static int act8945a_pmic_probe(struct platform_device *pdev)
{
struct regulator_config config = { };
const struct regulator_desc *regulators;
struct act8945a_pmic *act8945a;
struct regulator_dev *rdev;
struct regmap *regmap;
int i, num_regulators;
bool voltage_select;
regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!regmap) {
act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL);
if (!act8945a)
return -ENOMEM;
act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!act8945a->regmap) {
dev_err(&pdev->dev,
"could not retrieve regmap from parent device\n");
return -EINVAL;
@ -149,6 +308,7 @@ static int act8945a_pmic_probe(struct platform_device *pdev)
config.dev = &pdev->dev;
config.dev->of_node = pdev->dev.parent->of_node;
config.driver_data = act8945a;
for (i = 0; i < num_regulators; i++) {
rdev = devm_regulator_register(&pdev->dev, &regulators[i], &config);
if (IS_ERR(rdev)) {
@ -159,13 +319,29 @@ static int act8945a_pmic_probe(struct platform_device *pdev)
}
}
platform_set_drvdata(pdev, act8945a);
/* Unlock expert registers. */
return regmap_write(regmap, ACT8945A_SYS_UNLK_REGS, 0xef);
return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef);
}
static int act8945a_suspend(struct device *pdev)
{
struct act8945a_pmic *act8945a = dev_get_drvdata(pdev);
/*
* Ask the PMIC to enter the suspend mode on the next PWRHLD
* transition.
*/
return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42);
}
SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);
static struct platform_driver act8945a_pmic_driver = {
.driver = {
.name = "act8945a-regulator",
.pm = &act8945a_pm,
},
.probe = act8945a_pmic_probe,
};

30
include/dt-bindings/regulator/active-semi,8945a-regulator.h Normal file
View File

@ -0,0 +1,30 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2018 Microchip Technology, Inc. All rights reserved.
*
* Device Tree binding constants for the ACT8945A PMIC regulators
*/
#ifndef _DT_BINDINGS_REGULATOR_ACT8945A_H
#define _DT_BINDINGS_REGULATOR_ACT8945A_H
/*
* These constants should be used to specify regulator modes in device tree for
* ACT8945A regulators as follows:
* ACT8945A_REGULATOR_MODE_FIXED: It is specific to DCDC regulators and it
* specifies the usage of fixed-frequency
* PWM.
*
* ACT8945A_REGULATOR_MODE_NORMAL: It is specific to LDO regulators and it
* specifies the usage of normal mode.
*
* ACT8945A_REGULATOR_MODE_LOWPOWER: For DCDC and LDO regulators; it specify
* the usage of proprietary power-saving
* mode.
*/
#define ACT8945A_REGULATOR_MODE_FIXED 1
#define ACT8945A_REGULATOR_MODE_NORMAL 2
#define ACT8945A_REGULATOR_MODE_LOWPOWER 3
#endif