summaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
Diffstat (limited to 'drivers')
-rw-r--r--drivers/regulator/Kconfig1
-rw-r--r--drivers/regulator/max8973-regulator.c97
2 files changed, 98 insertions, 0 deletions
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index c77dc08b1202..129359f775d0 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -409,6 +409,7 @@ config REGULATOR_MAX8952
config REGULATOR_MAX8973
tristate "Maxim MAX8973 voltage regulator "
depends on I2C
+ depends on THERMAL && THERMAL_OF
select REGMAP_I2C
help
The MAXIM MAX8973 high-efficiency. three phase, DC-DC step-down
diff --git a/drivers/regulator/max8973-regulator.c b/drivers/regulator/max8973-regulator.c
index 5b75b7c2e3ea..08d2f13eca00 100644
--- a/drivers/regulator/max8973-regulator.c
+++ b/drivers/regulator/max8973-regulator.c
@@ -38,6 +38,9 @@
#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
@@ -74,6 +77,7 @@
#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
@@ -93,6 +97,12 @@
#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
@@ -112,6 +122,9 @@ struct max8973_chip {
int curr_gpio_val;
struct regulator_ops ops;
enum device_id id;
+ int junction_temp_warning;
+ int irq;
+ struct thermal_zone_device *tz_device;
};
/*
@@ -391,6 +404,10 @@ static int max8973_init_dcdc(struct max8973_chip *max,
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;
@@ -457,6 +474,79 @@ static int max8973_init_dcdc(struct max8973_chip *max,
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);
+
+ 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,
@@ -521,6 +611,11 @@ static struct max8973_regulator_platform_data *max8973_parse_dt(
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;
}
@@ -608,6 +703,7 @@ static int max8973_probe(struct i2c_client *client,
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;
if (gpio_is_valid(max->enable_gpio))
max->enable_external_control = true;
@@ -718,6 +814,7 @@ static int max8973_probe(struct i2c_client *client,
return ret;
}
+ max8973_thermal_init(max);
return 0;
}