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linux/drivers/regulator/lp872x.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

959 lines
25 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2012 Texas Instruments
*
* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/regulator/lp872x.h>
#include <linux/regulator/driver.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/regulator/of_regulator.h>
/* Registers : LP8720/8725 shared */
#define LP872X_GENERAL_CFG 0x00
#define LP872X_LDO1_VOUT 0x01
#define LP872X_LDO2_VOUT 0x02
#define LP872X_LDO3_VOUT 0x03
#define LP872X_LDO4_VOUT 0x04
#define LP872X_LDO5_VOUT 0x05
/* Registers : LP8720 */
#define LP8720_BUCK_VOUT1 0x06
#define LP8720_BUCK_VOUT2 0x07
#define LP8720_ENABLE 0x08
/* Registers : LP8725 */
#define LP8725_LILO1_VOUT 0x06
#define LP8725_LILO2_VOUT 0x07
#define LP8725_BUCK1_VOUT1 0x08
#define LP8725_BUCK1_VOUT2 0x09
#define LP8725_BUCK2_VOUT1 0x0A
#define LP8725_BUCK2_VOUT2 0x0B
#define LP8725_BUCK_CTRL 0x0C
#define LP8725_LDO_CTRL 0x0D
/* Mask/shift : LP8720/LP8725 shared */
#define LP872X_VOUT_M 0x1F
#define LP872X_START_DELAY_M 0xE0
#define LP872X_START_DELAY_S 5
#define LP872X_EN_LDO1_M BIT(0)
#define LP872X_EN_LDO2_M BIT(1)
#define LP872X_EN_LDO3_M BIT(2)
#define LP872X_EN_LDO4_M BIT(3)
#define LP872X_EN_LDO5_M BIT(4)
/* Mask/shift : LP8720 */
#define LP8720_TIMESTEP_S 0 /* Addr 00h */
#define LP8720_TIMESTEP_M BIT(0)
#define LP8720_EXT_DVS_M BIT(2)
#define LP8720_BUCK_FPWM_S 5 /* Addr 07h */
#define LP8720_BUCK_FPWM_M BIT(5)
#define LP8720_EN_BUCK_M BIT(5) /* Addr 08h */
#define LP8720_DVS_SEL_M BIT(7)
/* Mask/shift : LP8725 */
#define LP8725_TIMESTEP_M 0xC0 /* Addr 00h */
#define LP8725_TIMESTEP_S 6
#define LP8725_BUCK1_EN_M BIT(0)
#define LP8725_DVS1_M BIT(2)
#define LP8725_DVS2_M BIT(3)
#define LP8725_BUCK2_EN_M BIT(4)
#define LP8725_BUCK_CL_M 0xC0 /* Addr 09h, 0Bh */
#define LP8725_BUCK_CL_S 6
#define LP8725_BUCK1_FPWM_S 1 /* Addr 0Ch */
#define LP8725_BUCK1_FPWM_M BIT(1)
#define LP8725_BUCK2_FPWM_S 5
#define LP8725_BUCK2_FPWM_M BIT(5)
#define LP8725_EN_LILO1_M BIT(5) /* Addr 0Dh */
#define LP8725_EN_LILO2_M BIT(6)
/* PWM mode */
#define LP872X_FORCE_PWM 1
#define LP872X_AUTO_PWM 0
#define LP8720_NUM_REGULATORS 6
#define LP8725_NUM_REGULATORS 9
#define EXTERN_DVS_USED 0
#define MAX_DELAY 6
/* Default DVS Mode */
#define LP8720_DEFAULT_DVS 0
#define LP8725_DEFAULT_DVS BIT(2)
/* dump registers in regmap-debugfs */
#define MAX_REGISTERS 0x0F
enum lp872x_id {
LP8720,
LP8725,
};
struct lp872x {
struct regmap *regmap;
struct device *dev;
enum lp872x_id chipid;
struct lp872x_platform_data *pdata;
int num_regulators;
enum gpiod_flags dvs_pin;
};
/* LP8720/LP8725 shared voltage table for LDOs */
static const unsigned int lp872x_ldo_vtbl[] = {
1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, 1550000,
1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000, 2000000,
2100000, 2200000, 2300000, 2400000, 2500000, 2600000, 2650000, 2700000,
2750000, 2800000, 2850000, 2900000, 2950000, 3000000, 3100000, 3300000,
};
/* LP8720 LDO4 voltage table */
static const unsigned int lp8720_ldo4_vtbl[] = {
800000, 850000, 900000, 1000000, 1100000, 1200000, 1250000, 1300000,
1350000, 1400000, 1450000, 1500000, 1550000, 1600000, 1650000, 1700000,
1750000, 1800000, 1850000, 1900000, 2000000, 2100000, 2200000, 2300000,
2400000, 2500000, 2600000, 2650000, 2700000, 2750000, 2800000, 2850000,
};
/* LP8725 LILO(Low Input Low Output) voltage table */
static const unsigned int lp8725_lilo_vtbl[] = {
800000, 850000, 900000, 950000, 1000000, 1050000, 1100000, 1150000,
1200000, 1250000, 1300000, 1350000, 1400000, 1500000, 1600000, 1700000,
1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
2600000, 2700000, 2800000, 2850000, 2900000, 3000000, 3100000, 3300000,
};
/* LP8720 BUCK voltage table */
#define EXT_R 0 /* external resistor divider */
static const unsigned int lp8720_buck_vtbl[] = {
EXT_R, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
1550000, 1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000,
1950000, 2000000, 2050000, 2100000, 2150000, 2200000, 2250000, 2300000,
};
/* LP8725 BUCK voltage table */
static const unsigned int lp8725_buck_vtbl[] = {
800000, 850000, 900000, 950000, 1000000, 1050000, 1100000, 1150000,
1200000, 1250000, 1300000, 1350000, 1400000, 1500000, 1600000, 1700000,
1750000, 1800000, 1850000, 1900000, 2000000, 2100000, 2200000, 2300000,
2400000, 2500000, 2600000, 2700000, 2800000, 2850000, 2900000, 3000000,
};
/* LP8725 BUCK current limit */
static const unsigned int lp8725_buck_uA[] = {
460000, 780000, 1050000, 1370000,
};
static int lp872x_read_byte(struct lp872x *lp, u8 addr, u8 *data)
{
int ret;
unsigned int val;
ret = regmap_read(lp->regmap, addr, &val);
if (ret < 0) {
dev_err(lp->dev, "failed to read 0x%.2x\n", addr);
return ret;
}
*data = (u8)val;
return 0;
}
static inline int lp872x_write_byte(struct lp872x *lp, u8 addr, u8 data)
{
return regmap_write(lp->regmap, addr, data);
}
static inline int lp872x_update_bits(struct lp872x *lp, u8 addr,
unsigned int mask, u8 data)
{
return regmap_update_bits(lp->regmap, addr, mask, data);
}
static int lp872x_get_timestep_usec(struct lp872x *lp)
{
enum lp872x_id chip = lp->chipid;
u8 val, mask, shift;
int *time_usec, size, ret;
int lp8720_time_usec[] = { 25, 50 };
int lp8725_time_usec[] = { 32, 64, 128, 256 };
switch (chip) {
case LP8720:
mask = LP8720_TIMESTEP_M;
shift = LP8720_TIMESTEP_S;
time_usec = &lp8720_time_usec[0];
size = ARRAY_SIZE(lp8720_time_usec);
break;
case LP8725:
mask = LP8725_TIMESTEP_M;
shift = LP8725_TIMESTEP_S;
time_usec = &lp8725_time_usec[0];
size = ARRAY_SIZE(lp8725_time_usec);
break;
default:
return -EINVAL;
}
ret = lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val);
if (ret)
return ret;
val = (val & mask) >> shift;
if (val >= size)
return -EINVAL;
return *(time_usec + val);
}
static int lp872x_regulator_enable_time(struct regulator_dev *rdev)
{
struct lp872x *lp = rdev_get_drvdata(rdev);
enum lp872x_regulator_id rid = rdev_get_id(rdev);
int time_step_us = lp872x_get_timestep_usec(lp);
int ret;
u8 addr, val;
if (time_step_us < 0)
return time_step_us;
switch (rid) {
case LP8720_ID_LDO1 ... LP8720_ID_BUCK:
addr = LP872X_LDO1_VOUT + rid;
break;
case LP8725_ID_LDO1 ... LP8725_ID_BUCK1:
addr = LP872X_LDO1_VOUT + rid - LP8725_ID_BASE;
break;
case LP8725_ID_BUCK2:
addr = LP8725_BUCK2_VOUT1;
break;
default:
return -EINVAL;
}
ret = lp872x_read_byte(lp, addr, &val);
if (ret)
return ret;
val = (val & LP872X_START_DELAY_M) >> LP872X_START_DELAY_S;
return val > MAX_DELAY ? 0 : val * time_step_us;
}
static void lp872x_set_dvs(struct lp872x *lp, enum lp872x_dvs_sel dvs_sel,
struct gpio_desc *gpio)
{
enum gpiod_flags state;
state = dvs_sel == SEL_V1 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
gpiod_set_value(gpio, state);
lp->dvs_pin = state;
}
static u8 lp872x_select_buck_vout_addr(struct lp872x *lp,
enum lp872x_regulator_id buck)
{
u8 val, addr;
if (lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val))
return 0;
switch (buck) {
case LP8720_ID_BUCK:
if (val & LP8720_EXT_DVS_M) {
addr = (lp->dvs_pin == GPIOD_OUT_HIGH) ?
LP8720_BUCK_VOUT1 : LP8720_BUCK_VOUT2;
} else {
if (lp872x_read_byte(lp, LP8720_ENABLE, &val))
return 0;
addr = val & LP8720_DVS_SEL_M ?
LP8720_BUCK_VOUT1 : LP8720_BUCK_VOUT2;
}
break;
case LP8725_ID_BUCK1:
if (val & LP8725_DVS1_M)
addr = LP8725_BUCK1_VOUT1;
else
addr = (lp->dvs_pin == GPIOD_OUT_HIGH) ?
LP8725_BUCK1_VOUT1 : LP8725_BUCK1_VOUT2;
break;
case LP8725_ID_BUCK2:
addr = val & LP8725_DVS2_M ?
LP8725_BUCK2_VOUT1 : LP8725_BUCK2_VOUT2;
break;
default:
return 0;
}
return addr;
}
static bool lp872x_is_valid_buck_addr(u8 addr)
{
switch (addr) {
case LP8720_BUCK_VOUT1:
case LP8720_BUCK_VOUT2:
case LP8725_BUCK1_VOUT1:
case LP8725_BUCK1_VOUT2:
case LP8725_BUCK2_VOUT1:
case LP8725_BUCK2_VOUT2:
return true;
default:
return false;
}
}
static int lp872x_buck_set_voltage_sel(struct regulator_dev *rdev,
unsigned selector)
{
struct lp872x *lp = rdev_get_drvdata(rdev);
enum lp872x_regulator_id buck = rdev_get_id(rdev);
u8 addr, mask = LP872X_VOUT_M;
struct lp872x_dvs *dvs = lp->pdata ? lp->pdata->dvs : NULL;
if (dvs && dvs->gpio)
lp872x_set_dvs(lp, dvs->vsel, dvs->gpio);
addr = lp872x_select_buck_vout_addr(lp, buck);
if (!lp872x_is_valid_buck_addr(addr))
return -EINVAL;
return lp872x_update_bits(lp, addr, mask, selector);
}
static int lp872x_buck_get_voltage_sel(struct regulator_dev *rdev)
{
struct lp872x *lp = rdev_get_drvdata(rdev);
enum lp872x_regulator_id buck = rdev_get_id(rdev);
u8 addr, val;
int ret;
addr = lp872x_select_buck_vout_addr(lp, buck);
if (!lp872x_is_valid_buck_addr(addr))
return -EINVAL;
ret = lp872x_read_byte(lp, addr, &val);
if (ret)
return ret;
return val & LP872X_VOUT_M;
}
static int lp872x_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct lp872x *lp = rdev_get_drvdata(rdev);
enum lp872x_regulator_id buck = rdev_get_id(rdev);
u8 addr, mask, shift, val;
switch (buck) {
case LP8720_ID_BUCK:
addr = LP8720_BUCK_VOUT2;
mask = LP8720_BUCK_FPWM_M;
shift = LP8720_BUCK_FPWM_S;
break;
case LP8725_ID_BUCK1:
addr = LP8725_BUCK_CTRL;
mask = LP8725_BUCK1_FPWM_M;
shift = LP8725_BUCK1_FPWM_S;
break;
case LP8725_ID_BUCK2:
addr = LP8725_BUCK_CTRL;
mask = LP8725_BUCK2_FPWM_M;
shift = LP8725_BUCK2_FPWM_S;
break;
default:
return -EINVAL;
}
if (mode == REGULATOR_MODE_FAST)
val = LP872X_FORCE_PWM << shift;
else if (mode == REGULATOR_MODE_NORMAL)
val = LP872X_AUTO_PWM << shift;
else
return -EINVAL;
return lp872x_update_bits(lp, addr, mask, val);
}
static unsigned int lp872x_buck_get_mode(struct regulator_dev *rdev)
{
struct lp872x *lp = rdev_get_drvdata(rdev);
enum lp872x_regulator_id buck = rdev_get_id(rdev);
u8 addr, mask, val;
int ret;
switch (buck) {
case LP8720_ID_BUCK:
addr = LP8720_BUCK_VOUT2;
mask = LP8720_BUCK_FPWM_M;
break;
case LP8725_ID_BUCK1:
addr = LP8725_BUCK_CTRL;
mask = LP8725_BUCK1_FPWM_M;
break;
case LP8725_ID_BUCK2:
addr = LP8725_BUCK_CTRL;
mask = LP8725_BUCK2_FPWM_M;
break;
default:
return -EINVAL;
}
ret = lp872x_read_byte(lp, addr, &val);
if (ret)
return ret;
return val & mask ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
}
static const struct regulator_ops lp872x_ldo_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable_time = lp872x_regulator_enable_time,
};
static const struct regulator_ops lp8720_buck_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.set_voltage_sel = lp872x_buck_set_voltage_sel,
.get_voltage_sel = lp872x_buck_get_voltage_sel,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable_time = lp872x_regulator_enable_time,
.set_mode = lp872x_buck_set_mode,
.get_mode = lp872x_buck_get_mode,
};
static const struct regulator_ops lp8725_buck_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.set_voltage_sel = lp872x_buck_set_voltage_sel,
.get_voltage_sel = lp872x_buck_get_voltage_sel,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable_time = lp872x_regulator_enable_time,
.set_mode = lp872x_buck_set_mode,
.get_mode = lp872x_buck_get_mode,
.set_current_limit = regulator_set_current_limit_regmap,
.get_current_limit = regulator_get_current_limit_regmap,
};
static const struct regulator_desc lp8720_regulator_desc[] = {
{
.name = "ldo1",
.of_match = of_match_ptr("ldo1"),
.id = LP8720_ID_LDO1,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
.volt_table = lp872x_ldo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP872X_LDO1_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8720_ENABLE,
.enable_mask = LP872X_EN_LDO1_M,
},
{
.name = "ldo2",
.of_match = of_match_ptr("ldo2"),
.id = LP8720_ID_LDO2,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
.volt_table = lp872x_ldo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP872X_LDO2_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8720_ENABLE,
.enable_mask = LP872X_EN_LDO2_M,
},
{
.name = "ldo3",
.of_match = of_match_ptr("ldo3"),
.id = LP8720_ID_LDO3,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
.volt_table = lp872x_ldo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP872X_LDO3_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8720_ENABLE,
.enable_mask = LP872X_EN_LDO3_M,
},
{
.name = "ldo4",
.of_match = of_match_ptr("ldo4"),
.id = LP8720_ID_LDO4,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp8720_ldo4_vtbl),
.volt_table = lp8720_ldo4_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP872X_LDO4_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8720_ENABLE,
.enable_mask = LP872X_EN_LDO4_M,
},
{
.name = "ldo5",
.of_match = of_match_ptr("ldo5"),
.id = LP8720_ID_LDO5,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
.volt_table = lp872x_ldo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP872X_LDO5_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8720_ENABLE,
.enable_mask = LP872X_EN_LDO5_M,
},
{
.name = "buck",
.of_match = of_match_ptr("buck"),
.id = LP8720_ID_BUCK,
.ops = &lp8720_buck_ops,
.n_voltages = ARRAY_SIZE(lp8720_buck_vtbl),
.volt_table = lp8720_buck_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.enable_reg = LP8720_ENABLE,
.enable_mask = LP8720_EN_BUCK_M,
},
};
static const struct regulator_desc lp8725_regulator_desc[] = {
{
.name = "ldo1",
.of_match = of_match_ptr("ldo1"),
.id = LP8725_ID_LDO1,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
.volt_table = lp872x_ldo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP872X_LDO1_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8725_LDO_CTRL,
.enable_mask = LP872X_EN_LDO1_M,
},
{
.name = "ldo2",
.of_match = of_match_ptr("ldo2"),
.id = LP8725_ID_LDO2,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
.volt_table = lp872x_ldo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP872X_LDO2_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8725_LDO_CTRL,
.enable_mask = LP872X_EN_LDO2_M,
},
{
.name = "ldo3",
.of_match = of_match_ptr("ldo3"),
.id = LP8725_ID_LDO3,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
.volt_table = lp872x_ldo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP872X_LDO3_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8725_LDO_CTRL,
.enable_mask = LP872X_EN_LDO3_M,
},
{
.name = "ldo4",
.of_match = of_match_ptr("ldo4"),
.id = LP8725_ID_LDO4,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
.volt_table = lp872x_ldo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP872X_LDO4_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8725_LDO_CTRL,
.enable_mask = LP872X_EN_LDO4_M,
},
{
.name = "ldo5",
.of_match = of_match_ptr("ldo5"),
.id = LP8725_ID_LDO5,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
.volt_table = lp872x_ldo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP872X_LDO5_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8725_LDO_CTRL,
.enable_mask = LP872X_EN_LDO5_M,
},
{
.name = "lilo1",
.of_match = of_match_ptr("lilo1"),
.id = LP8725_ID_LILO1,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp8725_lilo_vtbl),
.volt_table = lp8725_lilo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP8725_LILO1_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8725_LDO_CTRL,
.enable_mask = LP8725_EN_LILO1_M,
},
{
.name = "lilo2",
.of_match = of_match_ptr("lilo2"),
.id = LP8725_ID_LILO2,
.ops = &lp872x_ldo_ops,
.n_voltages = ARRAY_SIZE(lp8725_lilo_vtbl),
.volt_table = lp8725_lilo_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.vsel_reg = LP8725_LILO2_VOUT,
.vsel_mask = LP872X_VOUT_M,
.enable_reg = LP8725_LDO_CTRL,
.enable_mask = LP8725_EN_LILO2_M,
},
{
.name = "buck1",
.of_match = of_match_ptr("buck1"),
.id = LP8725_ID_BUCK1,
.ops = &lp8725_buck_ops,
.n_voltages = ARRAY_SIZE(lp8725_buck_vtbl),
.volt_table = lp8725_buck_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.enable_reg = LP872X_GENERAL_CFG,
.enable_mask = LP8725_BUCK1_EN_M,
.curr_table = lp8725_buck_uA,
.n_current_limits = ARRAY_SIZE(lp8725_buck_uA),
.csel_reg = LP8725_BUCK1_VOUT2,
.csel_mask = LP8725_BUCK_CL_M,
},
{
.name = "buck2",
.of_match = of_match_ptr("buck2"),
.id = LP8725_ID_BUCK2,
.ops = &lp8725_buck_ops,
.n_voltages = ARRAY_SIZE(lp8725_buck_vtbl),
.volt_table = lp8725_buck_vtbl,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.enable_reg = LP872X_GENERAL_CFG,
.enable_mask = LP8725_BUCK2_EN_M,
.curr_table = lp8725_buck_uA,
.n_current_limits = ARRAY_SIZE(lp8725_buck_uA),
.csel_reg = LP8725_BUCK2_VOUT2,
.csel_mask = LP8725_BUCK_CL_M,
},
};
static int lp872x_init_dvs(struct lp872x *lp)
{
struct lp872x_dvs *dvs = lp->pdata ? lp->pdata->dvs : NULL;
enum gpiod_flags pinstate;
u8 mask[] = { LP8720_EXT_DVS_M, LP8725_DVS1_M | LP8725_DVS2_M };
u8 default_dvs_mode[] = { LP8720_DEFAULT_DVS, LP8725_DEFAULT_DVS };
if (!dvs)
goto set_default_dvs_mode;
if (!dvs->gpio)
goto set_default_dvs_mode;
pinstate = dvs->init_state;
dvs->gpio = devm_gpiod_get_optional(lp->dev, "ti,dvs", pinstate);
if (IS_ERR(dvs->gpio)) {
dev_err(lp->dev, "gpio request err: %ld\n", PTR_ERR(dvs->gpio));
return PTR_ERR(dvs->gpio);
}
lp->dvs_pin = pinstate;
return 0;
set_default_dvs_mode:
return lp872x_update_bits(lp, LP872X_GENERAL_CFG, mask[lp->chipid],
default_dvs_mode[lp->chipid]);
}
static int lp872x_hw_enable(struct lp872x *lp)
{
if (!lp->pdata)
return -EINVAL;
if (!lp->pdata->enable_gpio)
return 0;
/* Always set enable GPIO high. */
lp->pdata->enable_gpio = devm_gpiod_get_optional(lp->dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(lp->pdata->enable_gpio)) {
dev_err(lp->dev, "gpio request err: %ld\n", PTR_ERR(lp->pdata->enable_gpio));
return PTR_ERR(lp->pdata->enable_gpio);
}
/* Each chip has a different enable delay. */
if (lp->chipid == LP8720)
usleep_range(LP8720_ENABLE_DELAY, 1.5 * LP8720_ENABLE_DELAY);
else
usleep_range(LP8725_ENABLE_DELAY, 1.5 * LP8725_ENABLE_DELAY);
return 0;
}
static int lp872x_config(struct lp872x *lp)
{
struct lp872x_platform_data *pdata = lp->pdata;
int ret;
if (!pdata || !pdata->update_config)
goto init_dvs;
ret = lp872x_write_byte(lp, LP872X_GENERAL_CFG, pdata->general_config);
if (ret)
return ret;
init_dvs:
return lp872x_init_dvs(lp);
}
static struct regulator_init_data
*lp872x_find_regulator_init_data(int id, struct lp872x *lp)
{
struct lp872x_platform_data *pdata = lp->pdata;
int i;
if (!pdata)
return NULL;
for (i = 0; i < lp->num_regulators; i++) {
if (pdata->regulator_data[i].id == id)
return pdata->regulator_data[i].init_data;
}
return NULL;
}
static int lp872x_regulator_register(struct lp872x *lp)
{
const struct regulator_desc *desc;
struct regulator_config cfg = { };
struct regulator_dev *rdev;
int i;
for (i = 0; i < lp->num_regulators; i++) {
desc = (lp->chipid == LP8720) ? &lp8720_regulator_desc[i] :
&lp8725_regulator_desc[i];
cfg.dev = lp->dev;
cfg.init_data = lp872x_find_regulator_init_data(desc->id, lp);
cfg.driver_data = lp;
cfg.regmap = lp->regmap;
rdev = devm_regulator_register(lp->dev, desc, &cfg);
if (IS_ERR(rdev)) {
dev_err(lp->dev, "regulator register err");
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct regmap_config lp872x_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX_REGISTERS,
};
#ifdef CONFIG_OF
#define LP872X_VALID_OPMODE (REGULATOR_MODE_FAST | REGULATOR_MODE_NORMAL)
static struct of_regulator_match lp8720_matches[] = {
{ .name = "ldo1", .driver_data = (void *)LP8720_ID_LDO1, },
{ .name = "ldo2", .driver_data = (void *)LP8720_ID_LDO2, },
{ .name = "ldo3", .driver_data = (void *)LP8720_ID_LDO3, },
{ .name = "ldo4", .driver_data = (void *)LP8720_ID_LDO4, },
{ .name = "ldo5", .driver_data = (void *)LP8720_ID_LDO5, },
{ .name = "buck", .driver_data = (void *)LP8720_ID_BUCK, },
};
static struct of_regulator_match lp8725_matches[] = {
{ .name = "ldo1", .driver_data = (void *)LP8725_ID_LDO1, },
{ .name = "ldo2", .driver_data = (void *)LP8725_ID_LDO2, },
{ .name = "ldo3", .driver_data = (void *)LP8725_ID_LDO3, },
{ .name = "ldo4", .driver_data = (void *)LP8725_ID_LDO4, },
{ .name = "ldo5", .driver_data = (void *)LP8725_ID_LDO5, },
{ .name = "lilo1", .driver_data = (void *)LP8725_ID_LILO1, },
{ .name = "lilo2", .driver_data = (void *)LP8725_ID_LILO2, },
{ .name = "buck1", .driver_data = (void *)LP8725_ID_BUCK1, },
{ .name = "buck2", .driver_data = (void *)LP8725_ID_BUCK2, },
};
static struct lp872x_platform_data
*lp872x_populate_pdata_from_dt(struct device *dev, enum lp872x_id which)
{
struct device_node *np = dev->of_node;
struct lp872x_platform_data *pdata;
struct of_regulator_match *match;
int num_matches;
int count;
int i;
u8 dvs_state;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
of_property_read_u8(np, "ti,general-config", &pdata->general_config);
pdata->update_config = of_property_read_bool(np, "ti,update-config");
pdata->dvs = devm_kzalloc(dev, sizeof(struct lp872x_dvs), GFP_KERNEL);
if (!pdata->dvs)
return ERR_PTR(-ENOMEM);
of_property_read_u8(np, "ti,dvs-vsel", (u8 *)&pdata->dvs->vsel);
of_property_read_u8(np, "ti,dvs-state", &dvs_state);
pdata->dvs->init_state = dvs_state ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
if (of_get_child_count(np) == 0)
goto out;
switch (which) {
case LP8720:
match = lp8720_matches;
num_matches = ARRAY_SIZE(lp8720_matches);
break;
case LP8725:
match = lp8725_matches;
num_matches = ARRAY_SIZE(lp8725_matches);
break;
default:
goto out;
}
count = of_regulator_match(dev, np, match, num_matches);
if (count <= 0)
goto out;
for (i = 0; i < num_matches; i++) {
pdata->regulator_data[i].id =
(enum lp872x_regulator_id)match[i].driver_data;
pdata->regulator_data[i].init_data = match[i].init_data;
}
out:
return pdata;
}
#else
static struct lp872x_platform_data
*lp872x_populate_pdata_from_dt(struct device *dev, enum lp872x_id which)
{
return NULL;
}
#endif
static int lp872x_probe(struct i2c_client *cl)
{
const struct i2c_device_id *id = i2c_client_get_device_id(cl);
struct lp872x *lp;
struct lp872x_platform_data *pdata;
int ret;
static const int lp872x_num_regulators[] = {
[LP8720] = LP8720_NUM_REGULATORS,
[LP8725] = LP8725_NUM_REGULATORS,
};
if (cl->dev.of_node) {
pdata = lp872x_populate_pdata_from_dt(&cl->dev,
(enum lp872x_id)id->driver_data);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
} else {
pdata = dev_get_platdata(&cl->dev);
}
lp = devm_kzalloc(&cl->dev, sizeof(struct lp872x), GFP_KERNEL);
if (!lp)
return -ENOMEM;
lp->num_regulators = lp872x_num_regulators[id->driver_data];
lp->regmap = devm_regmap_init_i2c(cl, &lp872x_regmap_config);
if (IS_ERR(lp->regmap)) {
ret = PTR_ERR(lp->regmap);
dev_err(&cl->dev, "regmap init i2c err: %d\n", ret);
return ret;
}
lp->dev = &cl->dev;
lp->pdata = pdata;
lp->chipid = id->driver_data;
i2c_set_clientdata(cl, lp);
ret = lp872x_hw_enable(lp);
if (ret)
return ret;
ret = lp872x_config(lp);
if (ret)
return ret;
return lp872x_regulator_register(lp);
}
static const struct of_device_id lp872x_dt_ids[] __maybe_unused = {
{ .compatible = "ti,lp8720", },
{ .compatible = "ti,lp8725", },
{ }
};
MODULE_DEVICE_TABLE(of, lp872x_dt_ids);
static const struct i2c_device_id lp872x_ids[] = {
{"lp8720", LP8720},
{"lp8725", LP8725},
{ }
};
MODULE_DEVICE_TABLE(i2c, lp872x_ids);
static struct i2c_driver lp872x_driver = {
.driver = {
.name = "lp872x",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(lp872x_dt_ids),
},
.probe_new = lp872x_probe,
.id_table = lp872x_ids,
};
module_i2c_driver(lp872x_driver);
MODULE_DESCRIPTION("TI/National Semiconductor LP872x PMU Regulator Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL");
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