The patch
regulator: max8973: add support for junction thermal warning
has been applied to the regulator tree at
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git
All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
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to this mail.
Thanks,
Mark
>From d2d5437bdfdde20a75bdf59db1c1a77721613b22 Mon Sep 17 00:00:00 2001
From: Laxman Dewangan <ldewangan@xxxxxxxxxx>
Date: Wed, 13 Apr 2016 15:29:45 +0530
Subject: [PATCH] regulator: max8973: add support for junction thermal warning
The driver MAX8973 supports the driver for Maxim PMIC MAX77621.
MAX77621 supports the junction temp warning at 120 degC and
140 degC which is configurable. It generates alert signal when
junction temperature crosses these threshold.
MAX77621 does not support the continuous temp monitoring of
junction temperature. It just report whether junction temperature
crossed the threshold or not.
Add support to
- Configure junction temp warning threshold via DT property
to generate alert when it crosses the threshold.
- Add support to interrupt the host from this device when alert
occurred.
- read the junction temp via thermal framework.
Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
drivers/regulator/Kconfig | 1 +
drivers/regulator/max8973-regulator.c | 97 +++++++++++++++++++++++++++++
include/linux/regulator/max8973-regulator.h | 5 ++
3 files changed, 103 insertions(+)
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;
}
diff --git a/include/linux/regulator/max8973-regulator.h b/include/linux/regulator/max8973-regulator.h
index f6a8a16a0d4d..2fcb9980262a 100644
--- a/include/linux/regulator/max8973-regulator.h
+++ b/include/linux/regulator/max8973-regulator.h
@@ -54,6 +54,10 @@
* @reg_init_data: The regulator init data.
* @control_flags: Control flags which are ORed value of above flags to
* configure device.
+ * @junction_temp_warning: Junction temp in millicelcius on which warning need
+ * to be set. Thermal functionality is only supported on
+ * MAX77621. The threshold warning supported by MAX77621
+ * are 120C and 140C.
* @enable_ext_control: Enable the voltage enable/disable through external
* control signal from EN input pin. If it is false then
* voltage output will be enabled/disabled through EN bit of
@@ -67,6 +71,7 @@
struct max8973_regulator_platform_data {
struct regulator_init_data *reg_init_data;
unsigned long control_flags;
+ unsigned long junction_temp_warning;
bool enable_ext_control;
int enable_gpio;
int dvs_gpio;
--
2.8.0.rc3
--
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