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[PATCH 3/3] thermal: max77620: Add thermal driver for reporting junction temp

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  [PATCH 3/3] thermal: max77620: Add thermal driver for reporting junction temp Laxman Dewangan <ldewangan@nvidia.com> - 2016-03-04 15:00 +0100
    Re: [PATCH 3/3] thermal: max77620: Add thermal driver for reporting  junction temp Laxman Dewangan <ldewangan@nvidia.com> - 2016-03-04 15:20 +0100
    Re: [PATCH 3/3] thermal: max77620: Add thermal driver for reporting  junction temp Eduardo Valentin <edubezval@gmail.com> - 2016-03-08 22:30 +0100
      Re: [PATCH 3/3] thermal: max77620: Add thermal driver for reporting  junction temp Laxman Dewangan <ldewangan@nvidia.com> - 2016-03-09 13:50 +0100

#1350241 — [PATCH 3/3] thermal: max77620: Add thermal driver for reporting junction temp

Maxim Semiconductor Max77620 supports alarm interrupts when
its die temperature crosses 120C and 140C. These threshold
temperatures are not configurable.

Add thermal driver to register PMIC die temperature as thermal
zone sensor and capture the die temperature warning interrupts
to notifying the client.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
---
 drivers/thermal/Kconfig            |   9 +++
 drivers/thermal/Makefile           |   1 +
 drivers/thermal/thermal-max77620.c | 151 +++++++++++++++++++++++++++++++++++++
 3 files changed, 161 insertions(+)
 create mode 100644 drivers/thermal/thermal-max77620.c

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 5e7c97a..faba1a3 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -194,6 +194,15 @@ config IMX_THERMAL
 	  cpufreq is used as the cooling device to throttle CPUs when the
 	  passive trip is crossed.
 
+config MAX77620_THERMAL
+	tristate "Temperature sensor driver for Maxim MAX77620 PMIC"
+	depends on MFD_MAX77620
+	depends on OF
+	help
+	  Support for die junction temperature warning alarm for Maxim
+	  Semiconductor PMIC MAX77620 device. Device generates alert
+	  signal/interrupt when die temperature cross its threshold.
+
 config SPEAR_THERMAL
 	tristate "SPEAr thermal sensor driver"
 	depends on PLAT_SPEAR || COMPILE_TEST
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 8e9cbc3..c6bc2bd 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_DOVE_THERMAL)  	+= dove_thermal.o
 obj-$(CONFIG_DB8500_THERMAL)	+= db8500_thermal.o
 obj-$(CONFIG_ARMADA_THERMAL)	+= armada_thermal.o
 obj-$(CONFIG_IMX_THERMAL)	+= imx_thermal.o
+obj-$(CONFIG_MAX77620_THERMAL)	+= thermal-max77620.o
 obj-$(CONFIG_DB8500_CPUFREQ_COOLING)	+= db8500_cpufreq_cooling.o
 obj-$(CONFIG_INTEL_POWERCLAMP)	+= intel_powerclamp.o
 obj-$(CONFIG_X86_PKG_TEMP_THERMAL)	+= x86_pkg_temp_thermal.o
diff --git a/drivers/thermal/thermal-max77620.c b/drivers/thermal/thermal-max77620.c
new file mode 100644
index 0000000..846da62
--- /dev/null
+++ b/drivers/thermal/thermal-max77620.c
@@ -0,0 +1,151 @@
+/*
+ * Junction temperature thermal driver for Maxim Max77620.
+ *
+ * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Author: Laxman Dewangan <ldewangan@nvidia.com>
+ *	   Mallikarjun Kasoju <mkasoju@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/max77620.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/thermal.h>
+
+#define MAX77620_NORMAL_OPERATING_TEMP	100000
+#define MAX77620_TJALARM1_TEMP		120000
+#define MAX77620_TJALARM1_TEMP		140000
+
+struct max77620_therm_info {
+	struct device			*dev;
+	struct regmap			*rmap;
+	struct thermal_zone_device	*tz_device;
+	int				irq_tjalarm1;
+	int				irq_tjalarm2;
+};
+
+static int max77620_thermal_read_temp(void *data, int *temp)
+{
+	struct max77620_therm_info *mtherm = data;
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(mtherm->rmap, MAX77620_REG_STATLBT, &val);
+	if (ret < 0) {
+		dev_err(mtherm->dev, "Failed to read STATLBT, %d\n", ret);
+		return -EINVAL;
+	}
+
+	if (val & MAX77620_IRQ_TJALRM2_MASK)
+		*temp = MAX77620_TJALARM2_TEMP;
+	else if (val & MAX77620_IRQ_TJALRM1_MASK)
+		*temp = MAX77620_TJALARM1_TEMP;
+	else
+		*temp = MAX77620_NORMAL_OPERATING_TEMP;
+	return 0;
+}
+
+static const struct thermal_zone_of_device_ops max77620_thermal_ops = {
+	.get_temp = max77620_thermal_read_temp,
+};
+
+static irqreturn_t max77620_thermal_irq(int irq, void *data)
+{
+	struct max77620_therm_info *mtherm = data;
+
+	if (irq == mtherm->irq_tjalarm1)
+		dev_warn(mtherm->dev, "Junction Temp Alarm1(120C) occurred\n");
+	else if (irq == mtherm->irq_tjalarm2)
+		dev_warn(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n");
+
+	thermal_zone_device_update(mtherm->tz_device);
+
+	return IRQ_HANDLED;
+}
+
+static int max77620_thermal_probe(struct platform_device *pdev)
+{
+	struct max77620_therm_info *mtherm;
+	int ret;
+
+	if (!pdev->dev.of_node)
+		pdev->dev.of_node = pdev->dev.parent->of_node;
+
+	mtherm = devm_kzalloc(&pdev->dev, sizeof(*mtherm), GFP_KERNEL);
+	if (!mtherm)
+		return -ENOMEM;
+
+	mtherm->irq_tjalarm1 = platform_get_irq(pdev, 0);
+	mtherm->irq_tjalarm2 = platform_get_irq(pdev, 1);
+	if ((mtherm->irq_tjalarm1 < 0) || (mtherm->irq_tjalarm2 < 0)) {
+		dev_err(&pdev->dev, "Alarm irq number not available\n");
+		return -EINVAL;
+	}
+
+	mtherm->dev = &pdev->dev;
+	mtherm->rmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!mtherm->rmap) {
+		dev_err(&pdev->dev, "Failed to get parent regmap\n");
+		return -ENODEV;
+	}
+
+	mtherm->tz_device = devm_thermal_zone_of_sensor_register(&pdev->dev, 0,
+				mtherm, &max77620_thermal_ops);
+	if (IS_ERR(mtherm->tz_device)) {
+		ret = PTR_ERR(mtherm->tz_device);
+		dev_err(&pdev->dev, "Failed to register thermal zone, %d\n",
+			ret);
+		return ret;
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm1, NULL,
+					max77620_thermal_irq,
+					IRQF_ONESHOT | IRQF_SHARED,
+					dev_name(&pdev->dev), mtherm);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to request irq1, %d\n", ret);
+		return ret;
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm2, NULL,
+					max77620_thermal_irq,
+					IRQF_ONESHOT | IRQF_SHARED,
+					dev_name(&pdev->dev), mtherm);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to request irq2, %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, mtherm);
+	return 0;
+}
+
+static struct platform_device_id max77620_thermal_devtype[] = {
+	{ .name = "max77620-thermal", },
+	{},
+};
+
+static struct platform_driver max77620_thermal_driver = {
+	.driver = {
+		.name = "max77620-thermal",
+	},
+	.probe = max77620_thermal_probe,
+	.id_table = max77620_thermal_devtype,
+};
+
+module_platform_driver(max77620_thermal_driver);
+
+MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver");
+MODULE_ALIAS("platform:max77620-thermal");
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>");
+MODULE_LICENSE("GPL v2");
-- 
2.1.4

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#1350255 — Re: [PATCH 3/3] thermal: max77620: Add thermal driver for reporting junction temp

On Friday 04 March 2016 07:10 PM, Laxman Dewangan wrote:
> >
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/thermal.h>
> +
> +#define MAX77620_NORMAL_OPERATING_TEMP	100000
> +#define MAX77620_TJALARM1_TEMP		120000
> +#define MAX77620_TJALARM1_TEMP		140000
>
Oops, Second one is MAX77620_TJALARM2_TEMP.
Will send other version once I will have some more feedback.

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#1353424 — Re: [PATCH 3/3] thermal: max77620: Add thermal driver for reporting junction temp

Hello Laxman,

Thanks for working on this. Impressed how simplified these drivers are
becoming. I really liked you added the so waited devm_ helpers. Very
minor comments as follows (now that you will send a new version anyway).

On Fri, Mar 04, 2016 at 07:10:10PM +0530, Laxman Dewangan wrote:
> Maxim Semiconductor Max77620 supports alarm interrupts when
> its die temperature crosses 120C and 140C. These threshold
> temperatures are not configurable.
> 
> Add thermal driver to register PMIC die temperature as thermal
> zone sensor and capture the die temperature warning interrupts
> to notifying the client.

Are any of these critical?

> 
> Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
> ---
>  drivers/thermal/Kconfig            |   9 +++
>  drivers/thermal/Makefile           |   1 +
>  drivers/thermal/thermal-max77620.c | 151 +++++++++++++++++++++++++++++++++++++

Given that it is a DT based driver, please add also a binding entry
under Documentation/devicetree/bindings/thermal/


>  3 files changed, 161 insertions(+)
>  create mode 100644 drivers/thermal/thermal-max77620.c
> 
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 5e7c97a..faba1a3 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -194,6 +194,15 @@ config IMX_THERMAL
>  	  cpufreq is used as the cooling device to throttle CPUs when the
>  	  passive trip is crossed.
>  
> +config MAX77620_THERMAL
> +	tristate "Temperature sensor driver for Maxim MAX77620 PMIC"
> +	depends on MFD_MAX77620

Can this be COMPILE_TEST'ed?

> +	depends on OF

> +	help
> +	  Support for die junction temperature warning alarm for Maxim
> +	  Semiconductor PMIC MAX77620 device. Device generates alert
> +	  signal/interrupt when die temperature cross its threshold.
> +

Somehow checkpatch.pl --strict is complaining about this entry. Can you
please check?


>  config SPEAR_THERMAL
>  	tristate "SPEAr thermal sensor driver"
>  	depends on PLAT_SPEAR || COMPILE_TEST
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 8e9cbc3..c6bc2bd 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_DOVE_THERMAL)  	+= dove_thermal.o
>  obj-$(CONFIG_DB8500_THERMAL)	+= db8500_thermal.o
>  obj-$(CONFIG_ARMADA_THERMAL)	+= armada_thermal.o
>  obj-$(CONFIG_IMX_THERMAL)	+= imx_thermal.o
> +obj-$(CONFIG_MAX77620_THERMAL)	+= thermal-max77620.o
>  obj-$(CONFIG_DB8500_CPUFREQ_COOLING)	+= db8500_cpufreq_cooling.o
>  obj-$(CONFIG_INTEL_POWERCLAMP)	+= intel_powerclamp.o
>  obj-$(CONFIG_X86_PKG_TEMP_THERMAL)	+= x86_pkg_temp_thermal.o
> diff --git a/drivers/thermal/thermal-max77620.c b/drivers/thermal/thermal-max77620.c
> new file mode 100644
> index 0000000..846da62
> --- /dev/null
> +++ b/drivers/thermal/thermal-max77620.c
> @@ -0,0 +1,151 @@
> +/*
> + * Junction temperature thermal driver for Maxim Max77620.
> + *
> + * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
> + *
> + * Author: Laxman Dewangan <ldewangan@nvidia.com>
> + *	   Mallikarjun Kasoju <mkasoju@nvidia.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + */
> +
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/max77620.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/thermal.h>
> +
> +#define MAX77620_NORMAL_OPERATING_TEMP	100000
> +#define MAX77620_TJALARM1_TEMP		120000
> +#define MAX77620_TJALARM1_TEMP		140000
> +
> +struct max77620_therm_info {
> +	struct device			*dev;
> +	struct regmap			*rmap;
> +	struct thermal_zone_device	*tz_device;
> +	int				irq_tjalarm1;
> +	int				irq_tjalarm2;
> +};
> +
> +static int max77620_thermal_read_temp(void *data, int *temp)
> +{
> +	struct max77620_therm_info *mtherm = data;
> +	unsigned int val;
> +	int ret;
> +
> +	ret = regmap_read(mtherm->rmap, MAX77620_REG_STATLBT, &val);
> +	if (ret < 0) {
> +		dev_err(mtherm->dev, "Failed to read STATLBT, %d\n", ret);
> +		return -EINVAL;
> +	}
> +
> +	if (val & MAX77620_IRQ_TJALRM2_MASK)
> +		*temp = MAX77620_TJALARM2_TEMP;
> +	else if (val & MAX77620_IRQ_TJALRM1_MASK)
> +		*temp = MAX77620_TJALARM1_TEMP;
> +	else
> +		*temp = MAX77620_NORMAL_OPERATING_TEMP;

So, no way at all to get a temp?

> +	return 0;
> +}
> +
> +static const struct thermal_zone_of_device_ops max77620_thermal_ops = {
> +	.get_temp = max77620_thermal_read_temp,
> +};
> +
> +static irqreturn_t max77620_thermal_irq(int irq, void *data)
> +{
> +	struct max77620_therm_info *mtherm = data;
> +
> +	if (irq == mtherm->irq_tjalarm1)
> +		dev_warn(mtherm->dev, "Junction Temp Alarm1(120C) occurred\n");
> +	else if (irq == mtherm->irq_tjalarm2)
> +		dev_warn(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n");
> +
> +	thermal_zone_device_update(mtherm->tz_device);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int max77620_thermal_probe(struct platform_device *pdev)
> +{
> +	struct max77620_therm_info *mtherm;
> +	int ret;
> +
> +	if (!pdev->dev.of_node)
> +		pdev->dev.of_node = pdev->dev.parent->of_node;

Why is this needed?

> +
> +	mtherm = devm_kzalloc(&pdev->dev, sizeof(*mtherm), GFP_KERNEL);
> +	if (!mtherm)
> +		return -ENOMEM;
> +
> +	mtherm->irq_tjalarm1 = platform_get_irq(pdev, 0);
> +	mtherm->irq_tjalarm2 = platform_get_irq(pdev, 1);
> +	if ((mtherm->irq_tjalarm1 < 0) || (mtherm->irq_tjalarm2 < 0)) {
> +		dev_err(&pdev->dev, "Alarm irq number not available\n");
> +		return -EINVAL;
> +	}
> +
> +	mtherm->dev = &pdev->dev;
> +	mtherm->rmap = dev_get_regmap(pdev->dev.parent, NULL);
> +	if (!mtherm->rmap) {
> +		dev_err(&pdev->dev, "Failed to get parent regmap\n");
> +		return -ENODEV;
> +	}
> +
> +	mtherm->tz_device = devm_thermal_zone_of_sensor_register(&pdev->dev, 0,
> +				mtherm, &max77620_thermal_ops);
> +	if (IS_ERR(mtherm->tz_device)) {
> +		ret = PTR_ERR(mtherm->tz_device);
> +		dev_err(&pdev->dev, "Failed to register thermal zone, %d\n",
> +			ret);
> +		return ret;
> +	}
> +
> +	ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm1, NULL,
> +					max77620_thermal_irq,
> +					IRQF_ONESHOT | IRQF_SHARED,
> +					dev_name(&pdev->dev), mtherm);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Failed to request irq1, %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm2, NULL,
> +					max77620_thermal_irq,
> +					IRQF_ONESHOT | IRQF_SHARED,
> +					dev_name(&pdev->dev), mtherm);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Failed to request irq2, %d\n", ret);
> +		return ret;
> +	}
> +
> +	platform_set_drvdata(pdev, mtherm);
nit: empty line here.
> +	return 0;
> +}
> +
> +static struct platform_device_id max77620_thermal_devtype[] = {
> +	{ .name = "max77620-thermal", },
> +	{},
> +};
> +
> +static struct platform_driver max77620_thermal_driver = {
> +	.driver = {
> +		.name = "max77620-thermal",
> +	},
> +	.probe = max77620_thermal_probe,
> +	.id_table = max77620_thermal_devtype,
> +};
> +
> +module_platform_driver(max77620_thermal_driver);
> +
> +MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver");
> +MODULE_ALIAS("platform:max77620-thermal");
> +MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
> +MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.1.4
> 

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#1354089 — Re: [PATCH 3/3] thermal: max77620: Add thermal driver for reporting junction temp

On Wednesday 09 March 2016 02:54 AM, Eduardo Valentin wrote:
>

> On Fri, Mar 04, 2016 at 07:10:10PM +0530, Laxman Dewangan wrote:
>> Maxim Semiconductor Max77620 supports alarm interrupts when
>> its die temperature crosses 120C and 140C. These threshold
>> temperatures are not configurable.
>>
>> Add thermal driver to register PMIC die temperature as thermal
>> zone sensor and capture the die temperature warning interrupts
>> to notifying the client.
> Are any of these critical?

Datasheet says that two alarm interrupt at 120 and 140degC. 165 degC is 
shutdown temp on which PMIC get shutdown.
So just says as the warning interrupt.


>
>> Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
>> ---
>>   drivers/thermal/Kconfig            |   9 +++
>>   drivers/thermal/Makefile           |   1 +
>>   drivers/thermal/thermal-max77620.c | 151 +++++++++++++++++++++++++++++++++++++
> Given that it is a DT based driver, please add also a binding entry
> under Documentation/devicetree/bindings/thermal/

There is no new DT property and so did not added. But will add the doc 
saying the mandatory properties from thermal framework i.e. 
#thermal-sensor-cells

>
> +	depends on MFD_MAX77620
> Can this be COMPILE_TEST'ed?

Yes, I compile and tested .

>> +	depends on OF
>> +	help
>> +	  Support for die junction temperature warning alarm for Maxim
>> +	  Semiconductor PMIC MAX77620 device. Device generates alert
>> +	  signal/interrupt when die temperature cross its threshold.
>> +
> Somehow checkpatch.pl --strict is complaining about this entry. Can you
> please check?

The help should be minimum 4 lines otherwise warning is generated. I 
made it for next patch.

Second warning is:
/**
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#57:
new file mode 100644

total: 0 errors, 1 warnings, 0 checks, 174 lines checked

0001-thermal-max77620-Add-thermal-driver-for-reporting-ju.patch has 
style problems, please review.
**/

This is because new file get added and I think we can ignore it.

>> +	if (val & MAX77620_IRQ_TJALRM2_MASK)
>> +		*temp = MAX77620_TJALARM2_TEMP;
>> +	else if (val & MAX77620_IRQ_TJALRM1_MASK)
>> +		*temp = MAX77620_TJALARM1_TEMP;
>> +	else
>> +		*temp = MAX77620_NORMAL_OPERATING_TEMP;
> So, no way at all to get a temp?

yaah, there is no way other than getting the bit for whether temp 
crossed threshold or not.

>
>> +
>> +	if (!pdev->dev.of_node)
>> +		pdev->dev.of_node = pdev->dev.parent->of_node;
> Why is this needed?

This driver is sub mfd devices and it is registered without device node 
pointer.
The DT binding doc for the mfdmax77620 is flat, does not have thermal 
sub node.

hence to get the of_node for sensor, I am making the device node as node 
pointer for thermal sensor.
I can overwrite as
  pdev->dev.of_node = pdev->dev.parent->of_node also without check for 
simplification.

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