forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
859 lines
23 KiB
859 lines
23 KiB
/* |
|
* max8973-regulator.c -- Maxim max8973 |
|
* |
|
* Regulator driver for MAXIM 8973 DC-DC step-down switching regulator. |
|
* |
|
* Copyright (c) 2012, NVIDIA Corporation. |
|
* |
|
* Author: Laxman Dewangan <[email protected]> |
|
* |
|
* This program is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU General Public License as |
|
* published by the Free Software Foundation version 2. |
|
* |
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, |
|
* whether express or implied; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
* General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU General Public License |
|
* along with this program; if not, write to the Free Software |
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
|
* 02111-1307, USA |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/module.h> |
|
#include <linux/init.h> |
|
#include <linux/err.h> |
|
#include <linux/of.h> |
|
#include <linux/of_device.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/regulator/driver.h> |
|
#include <linux/regulator/machine.h> |
|
#include <linux/regulator/max8973-regulator.h> |
|
#include <linux/regulator/of_regulator.h> |
|
#include <linux/gpio.h> |
|
#include <linux/gpio/consumer.h> |
|
#include <linux/of_gpio.h> |
|
#include <linux/i2c.h> |
|
#include <linux/slab.h> |
|
#include <linux/regmap.h> |
|
#include <linux/thermal.h> |
|
#include <linux/irq.h> |
|
#include <linux/interrupt.h> |
|
|
|
/* Register definitions */ |
|
#define MAX8973_VOUT 0x0 |
|
#define MAX8973_VOUT_DVS 0x1 |
|
#define MAX8973_CONTROL1 0x2 |
|
#define MAX8973_CONTROL2 0x3 |
|
#define MAX8973_CHIPID1 0x4 |
|
#define MAX8973_CHIPID2 0x5 |
|
|
|
#define MAX8973_MAX_VOUT_REG 2 |
|
|
|
/* MAX8973_VOUT */ |
|
#define MAX8973_VOUT_ENABLE BIT(7) |
|
#define MAX8973_VOUT_MASK 0x7F |
|
|
|
/* MAX8973_VOUT_DVS */ |
|
#define MAX8973_DVS_VOUT_MASK 0x7F |
|
|
|
/* MAX8973_CONTROL1 */ |
|
#define MAX8973_SNS_ENABLE BIT(7) |
|
#define MAX8973_FPWM_EN_M BIT(6) |
|
#define MAX8973_NFSR_ENABLE BIT(5) |
|
#define MAX8973_AD_ENABLE BIT(4) |
|
#define MAX8973_BIAS_ENABLE BIT(3) |
|
#define MAX8973_FREQSHIFT_9PER BIT(2) |
|
|
|
#define MAX8973_RAMP_12mV_PER_US 0x0 |
|
#define MAX8973_RAMP_25mV_PER_US 0x1 |
|
#define MAX8973_RAMP_50mV_PER_US 0x2 |
|
#define MAX8973_RAMP_200mV_PER_US 0x3 |
|
#define MAX8973_RAMP_MASK 0x3 |
|
|
|
/* MAX8973_CONTROL2 */ |
|
#define MAX8973_WDTMR_ENABLE BIT(6) |
|
#define MAX8973_DISCH_ENBABLE BIT(5) |
|
#define MAX8973_FT_ENABLE BIT(4) |
|
#define MAX77621_T_JUNCTION_120 BIT(7) |
|
|
|
#define MAX8973_CKKADV_TRIP_MASK 0xC |
|
#define MAX8973_CKKADV_TRIP_DISABLE 0xC |
|
#define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0 |
|
#define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4 |
|
#define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8 |
|
#define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000 |
|
|
|
#define MAX8973_INDUCTOR_MIN_30_PER 0x0 |
|
#define MAX8973_INDUCTOR_NOMINAL 0x1 |
|
#define MAX8973_INDUCTOR_PLUS_30_PER 0x2 |
|
#define MAX8973_INDUCTOR_PLUS_60_PER 0x3 |
|
#define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000 |
|
|
|
#define MAX8973_MIN_VOLATGE 606250 |
|
#define MAX8973_MAX_VOLATGE 1400000 |
|
#define MAX8973_VOLATGE_STEP 6250 |
|
#define MAX8973_BUCK_N_VOLTAGE 0x80 |
|
|
|
#define MAX77621_CHIPID_TJINT_S BIT(0) |
|
|
|
#define MAX77621_NORMAL_OPERATING_TEMP 100000 |
|
#define MAX77621_TJINT_WARNING_TEMP_120 120000 |
|
#define MAX77621_TJINT_WARNING_TEMP_140 140000 |
|
|
|
enum device_id { |
|
MAX8973, |
|
MAX77621 |
|
}; |
|
|
|
/* Maxim 8973 chip information */ |
|
struct max8973_chip { |
|
struct device *dev; |
|
struct regulator_desc desc; |
|
struct regmap *regmap; |
|
bool enable_external_control; |
|
int dvs_gpio; |
|
int lru_index[MAX8973_MAX_VOUT_REG]; |
|
int curr_vout_val[MAX8973_MAX_VOUT_REG]; |
|
int curr_vout_reg; |
|
int curr_gpio_val; |
|
struct regulator_ops ops; |
|
enum device_id id; |
|
int junction_temp_warning; |
|
int irq; |
|
struct thermal_zone_device *tz_device; |
|
}; |
|
|
|
/* |
|
* find_voltage_set_register: Find new voltage configuration register (VOUT). |
|
* The finding of the new VOUT register will be based on the LRU mechanism. |
|
* Each VOUT register will have different voltage configured . This |
|
* Function will look if any of the VOUT register have requested voltage set |
|
* or not. |
|
* - If it is already there then it will make that register as most |
|
* recently used and return as found so that caller need not to set |
|
* the VOUT register but need to set the proper gpios to select this |
|
* VOUT register. |
|
* - If requested voltage is not found then it will use the least |
|
* recently mechanism to get new VOUT register for new configuration |
|
* and will return not_found so that caller need to set new VOUT |
|
* register and then gpios (both). |
|
*/ |
|
static bool find_voltage_set_register(struct max8973_chip *tps, |
|
int req_vsel, int *vout_reg, int *gpio_val) |
|
{ |
|
int i; |
|
bool found = false; |
|
int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1]; |
|
int found_index = MAX8973_MAX_VOUT_REG - 1; |
|
|
|
for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) { |
|
if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) { |
|
new_vout_reg = tps->lru_index[i]; |
|
found_index = i; |
|
found = true; |
|
goto update_lru_index; |
|
} |
|
} |
|
|
|
update_lru_index: |
|
for (i = found_index; i > 0; i--) |
|
tps->lru_index[i] = tps->lru_index[i - 1]; |
|
|
|
tps->lru_index[0] = new_vout_reg; |
|
*gpio_val = new_vout_reg; |
|
*vout_reg = MAX8973_VOUT + new_vout_reg; |
|
return found; |
|
} |
|
|
|
static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev) |
|
{ |
|
struct max8973_chip *max = rdev_get_drvdata(rdev); |
|
unsigned int data; |
|
int ret; |
|
|
|
ret = regmap_read(max->regmap, max->curr_vout_reg, &data); |
|
if (ret < 0) { |
|
dev_err(max->dev, "register %d read failed, err = %d\n", |
|
max->curr_vout_reg, ret); |
|
return ret; |
|
} |
|
return data & MAX8973_VOUT_MASK; |
|
} |
|
|
|
static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev, |
|
unsigned vsel) |
|
{ |
|
struct max8973_chip *max = rdev_get_drvdata(rdev); |
|
int ret; |
|
bool found = false; |
|
int vout_reg = max->curr_vout_reg; |
|
int gpio_val = max->curr_gpio_val; |
|
|
|
/* |
|
* If gpios are available to select the VOUT register then least |
|
* recently used register for new configuration. |
|
*/ |
|
if (gpio_is_valid(max->dvs_gpio)) |
|
found = find_voltage_set_register(max, vsel, |
|
&vout_reg, &gpio_val); |
|
|
|
if (!found) { |
|
ret = regmap_update_bits(max->regmap, vout_reg, |
|
MAX8973_VOUT_MASK, vsel); |
|
if (ret < 0) { |
|
dev_err(max->dev, "register %d update failed, err %d\n", |
|
vout_reg, ret); |
|
return ret; |
|
} |
|
max->curr_vout_reg = vout_reg; |
|
max->curr_vout_val[gpio_val] = vsel; |
|
} |
|
|
|
/* Select proper VOUT register vio gpios */ |
|
if (gpio_is_valid(max->dvs_gpio)) { |
|
gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1); |
|
max->curr_gpio_val = gpio_val; |
|
} |
|
return 0; |
|
} |
|
|
|
static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) |
|
{ |
|
struct max8973_chip *max = rdev_get_drvdata(rdev); |
|
int ret; |
|
int pwm; |
|
|
|
/* Enable force PWM mode in FAST mode only. */ |
|
switch (mode) { |
|
case REGULATOR_MODE_FAST: |
|
pwm = MAX8973_FPWM_EN_M; |
|
break; |
|
|
|
case REGULATOR_MODE_NORMAL: |
|
pwm = 0; |
|
break; |
|
|
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, |
|
MAX8973_FPWM_EN_M, pwm); |
|
if (ret < 0) |
|
dev_err(max->dev, "register %d update failed, err %d\n", |
|
MAX8973_CONTROL1, ret); |
|
return ret; |
|
} |
|
|
|
static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev) |
|
{ |
|
struct max8973_chip *max = rdev_get_drvdata(rdev); |
|
unsigned int data; |
|
int ret; |
|
|
|
ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); |
|
if (ret < 0) { |
|
dev_err(max->dev, "register %d read failed, err %d\n", |
|
MAX8973_CONTROL1, ret); |
|
return ret; |
|
} |
|
return (data & MAX8973_FPWM_EN_M) ? |
|
REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; |
|
} |
|
|
|
static int max8973_set_ramp_delay(struct regulator_dev *rdev, |
|
int ramp_delay) |
|
{ |
|
struct max8973_chip *max = rdev_get_drvdata(rdev); |
|
unsigned int control; |
|
int ret; |
|
|
|
/* Set ramp delay */ |
|
if (ramp_delay <= 12000) |
|
control = MAX8973_RAMP_12mV_PER_US; |
|
else if (ramp_delay <= 25000) |
|
control = MAX8973_RAMP_25mV_PER_US; |
|
else if (ramp_delay <= 50000) |
|
control = MAX8973_RAMP_50mV_PER_US; |
|
else if (ramp_delay <= 200000) |
|
control = MAX8973_RAMP_200mV_PER_US; |
|
else |
|
return -EINVAL; |
|
|
|
ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, |
|
MAX8973_RAMP_MASK, control); |
|
if (ret < 0) |
|
dev_err(max->dev, "register %d update failed, %d", |
|
MAX8973_CONTROL1, ret); |
|
return ret; |
|
} |
|
|
|
static int max8973_set_current_limit(struct regulator_dev *rdev, |
|
int min_ua, int max_ua) |
|
{ |
|
struct max8973_chip *max = rdev_get_drvdata(rdev); |
|
unsigned int val; |
|
int ret; |
|
|
|
if (max_ua <= 9000000) |
|
val = MAX8973_CKKADV_TRIP_75mV_PER_US; |
|
else if (max_ua <= 12000000) |
|
val = MAX8973_CKKADV_TRIP_150mV_PER_US; |
|
else |
|
val = MAX8973_CKKADV_TRIP_DISABLE; |
|
|
|
ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2, |
|
MAX8973_CKKADV_TRIP_MASK, val); |
|
if (ret < 0) { |
|
dev_err(max->dev, "register %d update failed: %d\n", |
|
MAX8973_CONTROL2, ret); |
|
return ret; |
|
} |
|
return 0; |
|
} |
|
|
|
static int max8973_get_current_limit(struct regulator_dev *rdev) |
|
{ |
|
struct max8973_chip *max = rdev_get_drvdata(rdev); |
|
unsigned int control2; |
|
int ret; |
|
|
|
ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2); |
|
if (ret < 0) { |
|
dev_err(max->dev, "register %d read failed: %d\n", |
|
MAX8973_CONTROL2, ret); |
|
return ret; |
|
} |
|
switch (control2 & MAX8973_CKKADV_TRIP_MASK) { |
|
case MAX8973_CKKADV_TRIP_DISABLE: |
|
return 15000000; |
|
case MAX8973_CKKADV_TRIP_150mV_PER_US: |
|
return 12000000; |
|
case MAX8973_CKKADV_TRIP_75mV_PER_US: |
|
return 9000000; |
|
default: |
|
break; |
|
} |
|
return 9000000; |
|
} |
|
|
|
static const struct regulator_ops max8973_dcdc_ops = { |
|
.get_voltage_sel = max8973_dcdc_get_voltage_sel, |
|
.set_voltage_sel = max8973_dcdc_set_voltage_sel, |
|
.list_voltage = regulator_list_voltage_linear, |
|
.set_mode = max8973_dcdc_set_mode, |
|
.get_mode = max8973_dcdc_get_mode, |
|
.set_voltage_time_sel = regulator_set_voltage_time_sel, |
|
.set_ramp_delay = max8973_set_ramp_delay, |
|
}; |
|
|
|
static int max8973_init_dcdc(struct max8973_chip *max, |
|
struct max8973_regulator_platform_data *pdata) |
|
{ |
|
int ret; |
|
uint8_t control1 = 0; |
|
uint8_t control2 = 0; |
|
unsigned int data; |
|
|
|
ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); |
|
if (ret < 0) { |
|
dev_err(max->dev, "register %d read failed, err = %d", |
|
MAX8973_CONTROL1, ret); |
|
return ret; |
|
} |
|
control1 = data & MAX8973_RAMP_MASK; |
|
switch (control1) { |
|
case MAX8973_RAMP_12mV_PER_US: |
|
max->desc.ramp_delay = 12000; |
|
break; |
|
case MAX8973_RAMP_25mV_PER_US: |
|
max->desc.ramp_delay = 25000; |
|
break; |
|
case MAX8973_RAMP_50mV_PER_US: |
|
max->desc.ramp_delay = 50000; |
|
break; |
|
case MAX8973_RAMP_200mV_PER_US: |
|
max->desc.ramp_delay = 200000; |
|
break; |
|
} |
|
|
|
if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE) |
|
control1 |= MAX8973_SNS_ENABLE; |
|
|
|
if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE)) |
|
control1 |= MAX8973_NFSR_ENABLE; |
|
|
|
if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE) |
|
control1 |= MAX8973_AD_ENABLE; |
|
|
|
if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) { |
|
control1 |= MAX8973_BIAS_ENABLE; |
|
max->desc.enable_time = 20; |
|
} else { |
|
max->desc.enable_time = 240; |
|
} |
|
|
|
if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) |
|
control1 |= MAX8973_FREQSHIFT_9PER; |
|
|
|
if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) && |
|
(max->id == MAX77621)) |
|
control2 |= MAX77621_T_JUNCTION_120; |
|
|
|
if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE)) |
|
control2 |= MAX8973_DISCH_ENBABLE; |
|
|
|
/* Clock advance trip configuration */ |
|
switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) { |
|
case MAX8973_CONTROL_CLKADV_TRIP_DISABLED: |
|
control2 |= MAX8973_CKKADV_TRIP_DISABLE; |
|
break; |
|
|
|
case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US: |
|
control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US; |
|
break; |
|
|
|
case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US: |
|
control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US; |
|
break; |
|
|
|
case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS: |
|
control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS; |
|
break; |
|
} |
|
|
|
/* Configure inductor value */ |
|
switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) { |
|
case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL: |
|
control2 |= MAX8973_INDUCTOR_NOMINAL; |
|
break; |
|
|
|
case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER: |
|
control2 |= MAX8973_INDUCTOR_MIN_30_PER; |
|
break; |
|
|
|
case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER: |
|
control2 |= MAX8973_INDUCTOR_PLUS_30_PER; |
|
break; |
|
|
|
case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER: |
|
control2 |= MAX8973_INDUCTOR_PLUS_60_PER; |
|
break; |
|
} |
|
|
|
ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1); |
|
if (ret < 0) { |
|
dev_err(max->dev, "register %d write failed, err = %d", |
|
MAX8973_CONTROL1, ret); |
|
return ret; |
|
} |
|
|
|
ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2); |
|
if (ret < 0) { |
|
dev_err(max->dev, "register %d write failed, err = %d", |
|
MAX8973_CONTROL2, ret); |
|
return ret; |
|
} |
|
|
|
/* If external control is enabled then disable EN bit */ |
|
if (max->enable_external_control && (max->id == MAX8973)) { |
|
ret = regmap_update_bits(max->regmap, MAX8973_VOUT, |
|
MAX8973_VOUT_ENABLE, 0); |
|
if (ret < 0) |
|
dev_err(max->dev, "register %d update failed, err = %d", |
|
MAX8973_VOUT, ret); |
|
} |
|
return ret; |
|
} |
|
|
|
static int max8973_thermal_read_temp(void *data, int *temp) |
|
{ |
|
struct max8973_chip *mchip = data; |
|
unsigned int val; |
|
int ret; |
|
|
|
ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val); |
|
if (ret < 0) { |
|
dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret); |
|
return ret; |
|
} |
|
|
|
/* +1 degC to trigger cool devive */ |
|
if (val & MAX77621_CHIPID_TJINT_S) |
|
*temp = mchip->junction_temp_warning + 1000; |
|
else |
|
*temp = MAX77621_NORMAL_OPERATING_TEMP; |
|
|
|
return 0; |
|
} |
|
|
|
static irqreturn_t max8973_thermal_irq(int irq, void *data) |
|
{ |
|
struct max8973_chip *mchip = data; |
|
|
|
thermal_zone_device_update(mchip->tz_device, |
|
THERMAL_EVENT_UNSPECIFIED); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static const struct thermal_zone_of_device_ops max77621_tz_ops = { |
|
.get_temp = max8973_thermal_read_temp, |
|
}; |
|
|
|
static int max8973_thermal_init(struct max8973_chip *mchip) |
|
{ |
|
struct thermal_zone_device *tzd; |
|
struct irq_data *irq_data; |
|
unsigned long irq_flags = 0; |
|
int ret; |
|
|
|
if (mchip->id != MAX77621) |
|
return 0; |
|
|
|
tzd = devm_thermal_zone_of_sensor_register(mchip->dev, 0, mchip, |
|
&max77621_tz_ops); |
|
if (IS_ERR(tzd)) { |
|
ret = PTR_ERR(tzd); |
|
dev_err(mchip->dev, "Failed to register thermal sensor: %d\n", |
|
ret); |
|
return ret; |
|
} |
|
|
|
if (mchip->irq <= 0) |
|
return 0; |
|
|
|
irq_data = irq_get_irq_data(mchip->irq); |
|
if (irq_data) |
|
irq_flags = irqd_get_trigger_type(irq_data); |
|
|
|
ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL, |
|
max8973_thermal_irq, |
|
IRQF_ONESHOT | IRQF_SHARED | irq_flags, |
|
dev_name(mchip->dev), mchip); |
|
if (ret < 0) { |
|
dev_err(mchip->dev, "Failed to request irq %d, %d\n", |
|
mchip->irq, ret); |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static const struct regmap_config max8973_regmap_config = { |
|
.reg_bits = 8, |
|
.val_bits = 8, |
|
.max_register = MAX8973_CHIPID2, |
|
.cache_type = REGCACHE_RBTREE, |
|
}; |
|
|
|
static struct max8973_regulator_platform_data *max8973_parse_dt( |
|
struct device *dev) |
|
{ |
|
struct max8973_regulator_platform_data *pdata; |
|
struct device_node *np = dev->of_node; |
|
int ret; |
|
u32 pval; |
|
bool etr_enable; |
|
bool etr_sensitivity_high; |
|
|
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
|
if (!pdata) |
|
return NULL; |
|
|
|
pdata->enable_ext_control = of_property_read_bool(np, |
|
"maxim,externally-enable"); |
|
pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0); |
|
|
|
ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval); |
|
if (!ret) |
|
pdata->dvs_def_state = pval; |
|
|
|
if (of_property_read_bool(np, "maxim,enable-remote-sense")) |
|
pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE; |
|
|
|
if (of_property_read_bool(np, "maxim,enable-falling-slew-rate")) |
|
pdata->control_flags |= |
|
MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE; |
|
|
|
if (of_property_read_bool(np, "maxim,enable-active-discharge")) |
|
pdata->control_flags |= |
|
MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE; |
|
|
|
if (of_property_read_bool(np, "maxim,enable-frequency-shift")) |
|
pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE; |
|
|
|
if (of_property_read_bool(np, "maxim,enable-bias-control")) |
|
pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE; |
|
|
|
etr_enable = of_property_read_bool(np, "maxim,enable-etr"); |
|
etr_sensitivity_high = of_property_read_bool(np, |
|
"maxim,enable-high-etr-sensitivity"); |
|
if (etr_sensitivity_high) |
|
etr_enable = true; |
|
|
|
if (etr_enable) { |
|
if (etr_sensitivity_high) |
|
pdata->control_flags |= |
|
MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US; |
|
else |
|
pdata->control_flags |= |
|
MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US; |
|
} else { |
|
pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED; |
|
} |
|
|
|
pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140; |
|
ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval); |
|
if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120)) |
|
pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120; |
|
|
|
return pdata; |
|
} |
|
|
|
static const struct of_device_id of_max8973_match_tbl[] = { |
|
{ .compatible = "maxim,max8973", .data = (void *)MAX8973, }, |
|
{ .compatible = "maxim,max77621", .data = (void *)MAX77621, }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, of_max8973_match_tbl); |
|
|
|
static int max8973_probe(struct i2c_client *client, |
|
const struct i2c_device_id *id) |
|
{ |
|
struct max8973_regulator_platform_data *pdata; |
|
struct regulator_init_data *ridata; |
|
struct regulator_config config = { }; |
|
struct regulator_dev *rdev; |
|
struct max8973_chip *max; |
|
bool pdata_from_dt = false; |
|
unsigned int chip_id; |
|
struct gpio_desc *gpiod; |
|
enum gpiod_flags gflags; |
|
int ret; |
|
|
|
pdata = dev_get_platdata(&client->dev); |
|
|
|
if (!pdata && client->dev.of_node) { |
|
pdata = max8973_parse_dt(&client->dev); |
|
pdata_from_dt = true; |
|
} |
|
|
|
if (!pdata) { |
|
dev_err(&client->dev, "No Platform data"); |
|
return -EIO; |
|
} |
|
|
|
if (pdata->dvs_gpio == -EPROBE_DEFER) |
|
return -EPROBE_DEFER; |
|
|
|
max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); |
|
if (!max) |
|
return -ENOMEM; |
|
|
|
max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); |
|
if (IS_ERR(max->regmap)) { |
|
ret = PTR_ERR(max->regmap); |
|
dev_err(&client->dev, "regmap init failed, err %d\n", ret); |
|
return ret; |
|
} |
|
|
|
if (client->dev.of_node) { |
|
const struct of_device_id *match; |
|
|
|
match = of_match_device(of_match_ptr(of_max8973_match_tbl), |
|
&client->dev); |
|
if (!match) |
|
return -ENODATA; |
|
max->id = (u32)((uintptr_t)match->data); |
|
} else { |
|
max->id = id->driver_data; |
|
} |
|
|
|
ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id); |
|
if (ret < 0) { |
|
dev_err(&client->dev, "register CHIPID1 read failed, %d", ret); |
|
return ret; |
|
} |
|
|
|
dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n", |
|
(chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7); |
|
|
|
i2c_set_clientdata(client, max); |
|
max->ops = max8973_dcdc_ops; |
|
max->dev = &client->dev; |
|
max->desc.name = id->name; |
|
max->desc.id = 0; |
|
max->desc.ops = &max->ops; |
|
max->desc.type = REGULATOR_VOLTAGE; |
|
max->desc.owner = THIS_MODULE; |
|
max->desc.min_uV = MAX8973_MIN_VOLATGE; |
|
max->desc.uV_step = MAX8973_VOLATGE_STEP; |
|
max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; |
|
|
|
max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; |
|
max->enable_external_control = pdata->enable_ext_control; |
|
max->curr_gpio_val = pdata->dvs_def_state; |
|
max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; |
|
max->junction_temp_warning = pdata->junction_temp_warning; |
|
|
|
max->lru_index[0] = max->curr_vout_reg; |
|
|
|
if (gpio_is_valid(max->dvs_gpio)) { |
|
int gpio_flags; |
|
int i; |
|
|
|
gpio_flags = (pdata->dvs_def_state) ? |
|
GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; |
|
ret = devm_gpio_request_one(&client->dev, max->dvs_gpio, |
|
gpio_flags, "max8973-dvs"); |
|
if (ret) { |
|
dev_err(&client->dev, |
|
"gpio_request for gpio %d failed, err = %d\n", |
|
max->dvs_gpio, ret); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Initialize the lru index with vout_reg id |
|
* The index 0 will be most recently used and |
|
* set with the max->curr_vout_reg */ |
|
for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) |
|
max->lru_index[i] = i; |
|
max->lru_index[0] = max->curr_vout_reg; |
|
max->lru_index[max->curr_vout_reg] = 0; |
|
} else { |
|
/* |
|
* If there is no DVS GPIO, the VOUT register |
|
* address is fixed. |
|
*/ |
|
max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap; |
|
max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap; |
|
max->desc.vsel_reg = max->curr_vout_reg; |
|
max->desc.vsel_mask = MAX8973_VOUT_MASK; |
|
} |
|
|
|
if (pdata_from_dt) |
|
pdata->reg_init_data = of_get_regulator_init_data(&client->dev, |
|
client->dev.of_node, &max->desc); |
|
|
|
ridata = pdata->reg_init_data; |
|
switch (max->id) { |
|
case MAX8973: |
|
if (!pdata->enable_ext_control) { |
|
max->desc.enable_reg = MAX8973_VOUT; |
|
max->desc.enable_mask = MAX8973_VOUT_ENABLE; |
|
max->ops.enable = regulator_enable_regmap; |
|
max->ops.disable = regulator_disable_regmap; |
|
max->ops.is_enabled = regulator_is_enabled_regmap; |
|
break; |
|
} |
|
|
|
if (ridata && (ridata->constraints.always_on || |
|
ridata->constraints.boot_on)) |
|
gflags = GPIOD_OUT_HIGH; |
|
else |
|
gflags = GPIOD_OUT_LOW; |
|
gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE; |
|
gpiod = devm_gpiod_get_optional(&client->dev, |
|
"maxim,enable", |
|
gflags); |
|
if (IS_ERR(gpiod)) |
|
return PTR_ERR(gpiod); |
|
if (gpiod) { |
|
config.ena_gpiod = gpiod; |
|
max->enable_external_control = true; |
|
} |
|
|
|
break; |
|
|
|
case MAX77621: |
|
/* |
|
* We do not let the core switch this regulator on/off, |
|
* we just leave it on. |
|
*/ |
|
gpiod = devm_gpiod_get_optional(&client->dev, |
|
"maxim,enable", |
|
GPIOD_OUT_HIGH); |
|
if (IS_ERR(gpiod)) |
|
return PTR_ERR(gpiod); |
|
if (gpiod) |
|
max->enable_external_control = true; |
|
|
|
max->desc.enable_reg = MAX8973_VOUT; |
|
max->desc.enable_mask = MAX8973_VOUT_ENABLE; |
|
max->ops.enable = regulator_enable_regmap; |
|
max->ops.disable = regulator_disable_regmap; |
|
max->ops.is_enabled = regulator_is_enabled_regmap; |
|
max->ops.set_current_limit = max8973_set_current_limit; |
|
max->ops.get_current_limit = max8973_get_current_limit; |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
ret = max8973_init_dcdc(max, pdata); |
|
if (ret < 0) { |
|
dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret); |
|
return ret; |
|
} |
|
|
|
config.dev = &client->dev; |
|
config.init_data = pdata->reg_init_data; |
|
config.driver_data = max; |
|
config.of_node = client->dev.of_node; |
|
config.regmap = max->regmap; |
|
|
|
/* |
|
* Register the regulators |
|
* Turn the GPIO descriptor over to the regulator core for |
|
* lifecycle management if we pass an ena_gpiod. |
|
*/ |
|
if (config.ena_gpiod) |
|
devm_gpiod_unhinge(&client->dev, config.ena_gpiod); |
|
rdev = devm_regulator_register(&client->dev, &max->desc, &config); |
|
if (IS_ERR(rdev)) { |
|
ret = PTR_ERR(rdev); |
|
dev_err(max->dev, "regulator register failed, err %d\n", ret); |
|
return ret; |
|
} |
|
|
|
max8973_thermal_init(max); |
|
return 0; |
|
} |
|
|
|
static const struct i2c_device_id max8973_id[] = { |
|
{.name = "max8973", .driver_data = MAX8973}, |
|
{.name = "max77621", .driver_data = MAX77621}, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, max8973_id); |
|
|
|
static struct i2c_driver max8973_i2c_driver = { |
|
.driver = { |
|
.name = "max8973", |
|
.of_match_table = of_max8973_match_tbl, |
|
}, |
|
.probe = max8973_probe, |
|
.id_table = max8973_id, |
|
}; |
|
|
|
static int __init max8973_init(void) |
|
{ |
|
return i2c_add_driver(&max8973_i2c_driver); |
|
} |
|
subsys_initcall(max8973_init); |
|
|
|
static void __exit max8973_cleanup(void) |
|
{ |
|
i2c_del_driver(&max8973_i2c_driver); |
|
} |
|
module_exit(max8973_cleanup); |
|
|
|
MODULE_AUTHOR("Laxman Dewangan <[email protected]>"); |
|
MODULE_DESCRIPTION("MAX8973 voltage regulator driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|