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[PATCH v2 00/10] Platform support for thermal management on Juno

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  [PATCH v2 00/10] Platform support for thermal management on Juno Punit Agrawal <punit.agrawal@arm.com> - 2015-08-03 17:30 +0200
    [PATCH v2 09/10] arm64: dts: Add sensor node to Juno dt Punit Agrawal <punit.agrawal@arm.com> - 2015-08-03 17:30 +0200
    [PATCH v2 02/10] cpufreq-dt: Supply power coefficient when registering cooling devices Punit Agrawal <punit.agrawal@arm.com> - 2015-08-03 17:30 +0200
    [PATCH v2 07/10] hwmon: Support sensors exported via ARM SCP interface Punit Agrawal <punit.agrawal@arm.com> - 2015-08-03 17:30 +0200
    [PATCH v2 10/10] arm64: dts: Create SoC thermal zone for Juno Punit Agrawal <punit.agrawal@arm.com> - 2015-08-03 17:30 +0200

#1198954 — [PATCH v2 00/10] Platform support for thermal management on Juno

Hi,

The series adds support for thermal management on ARM Juno development
platform. As part of this development, common infrastructure is added
to support registering cpu cooling devices that work with the power
allocator thermal governor.

Patch 1 extends the CPU nodes binding to provide an optional dynamic
power coefficient which can be used to create a dynamic power model
for the CPUs. This model is used to constrain device power consumption
(using power_allocator governor) when the system is thermally
constrained.

Patches 2-3 extends the cpufreq-dt and arm_big_little driver to
register cpu cooling devices with the dynamic coefficient when
provided.

Patch 4 is a fix that aligns the behaviour of
thermal_zone_of_sensor_register with it's documented return value when
THERMAL_OF is configured off.

Patches 5-8 create a hwmon sensor driver for sensors provided by SCPI
firmware. Patch 7 adds support for the temperature sensors to register
with the thermal framework. This allows setting up platform thermals
using OF thermal bindings.

The last two patches add support for the sensors and the thermal zones
in the Juno device tree.

The Juno specific patches depend on SCPI and cpufreq patches[0] from
Sudeep. The SCPI protocol document with details of the sensor
interface can be found at [1], [2].

Thanks,
Punit

Changes v1->v2
  - added documentation for the scpi-hwmon driver
  - replaced static allocation of platform structure in scpi-hwmon.c
    with dynamic allocation
  - re-structured registering of thermal zones to better handle
    error conditions
  - reduced chattiness in scpi-hwmon.c
  - corrected sensor numbering to align with hwmon documentation
  - dynamic allocation of attributes and attribute groups

[0] http://thread.gmane.org/gmane.linux.kernel/2009735
[1] http://community.arm.com/servlet/JiveServlet/download/8401-45-18326/DUI0922B_scp_message_interface.pdf
[2] https://wiki.linaro.org/ARM/Juno?action=AttachFile&do=get&target=DUI0922B_scp_message_interface.pdf
v1: http://thread.gmane.org/gmane.linux.kernel/2002152

Punit Agrawal (10):
  devicetree: bindings: Add optional dynamic-power-coefficient property
  cpufreq-dt: Supply power coefficient when registering cooling devices
  cpufreq: arm_big_little: Add support to register a cpufreq cooling
    device
  thermal: Fix thermal_zone_of_sensor_register to match documentation
  Documentation: add DT bindings for ARM SCPI sensors
  firmware: arm_scpi: Extend to support sensors
  hwmon: Support sensors exported via ARM SCP interface
  hwmon: Support registration of thermal zones for SCP temperature
    sensors
  arm64: dts: Add sensor node to Juno dt
  arm64: dts: Create SoC thermal zone for Juno

 Documentation/devicetree/bindings/arm/arm,scpi.txt |  15 ++
 Documentation/devicetree/bindings/arm/cpus.txt     |  15 ++
 Documentation/hwmon/scpi-hwmon                     |  33 +++
 arch/arm64/boot/dts/arm/juno-base.dtsi             |   5 +
 arch/arm64/boot/dts/arm/juno.dts                   |  50 ++++
 drivers/cpufreq/arm_big_little.c                   |  52 +++-
 drivers/cpufreq/cpufreq-dt.c                       |   9 +-
 drivers/firmware/arm_scpi.c                        |  60 +++++
 drivers/hwmon/Kconfig                              |   8 +
 drivers/hwmon/Makefile                             |   1 +
 drivers/hwmon/scpi-hwmon.c                         | 284 +++++++++++++++++++++
 include/linux/scpi_protocol.h                      |  17 ++
 include/linux/thermal.h                            |   2 +-
 13 files changed, 546 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/hwmon/scpi-hwmon
 create mode 100644 drivers/hwmon/scpi-hwmon.c

-- 
2.1.4

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#1198955 — [PATCH v2 09/10] arm64: dts: Add sensor node to Juno dt

The SCP firmware on Juno provides access to SoC sensors via the
SCPI. Add the sensor nodes to the device tree to enable this support.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
---
 arch/arm64/boot/dts/arm/juno-base.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/boot/dts/arm/juno-base.dtsi b/arch/arm64/boot/dts/arm/juno-base.dtsi
index c624208..dd5158e 100644
--- a/arch/arm64/boot/dts/arm/juno-base.dtsi
+++ b/arch/arm64/boot/dts/arm/juno-base.dtsi
@@ -96,6 +96,11 @@
 				clock-output-names = "pxlclk0", "pxlclk1";
 			};
 		};
+
+		scpi_sensors0: sensors {
+			compatible = "arm,scpi-sensors";
+			#thermal-sensor-cells = <1>;
+		};
 	};
 
 	/include/ "juno-clocks.dtsi"
-- 
2.1.4

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#1198956 — [PATCH v2 02/10] cpufreq-dt: Supply power coefficient when registering cooling devices

Support registering cooling devices with dynamic power coefficient
where provided by the device tree. This allows OF registered cooling
devices driver to be used with the power_allocator thermal governor.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Eduardo Valentin <edubezval@gmail.com>
---
 drivers/cpufreq/cpufreq-dt.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 528a82bf..1d1f61a 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -344,8 +344,13 @@ static void cpufreq_ready(struct cpufreq_policy *policy)
 	 * thermal DT code takes care of matching them.
 	 */
 	if (of_find_property(np, "#cooling-cells", NULL)) {
-		priv->cdev = of_cpufreq_cooling_register(np,
-							 policy->related_cpus);
+		u32 power_coefficient = 0;
+
+		of_property_read_u32(np, "dynamic-power-coefficient",
+				     &power_coefficient);
+
+		priv->cdev = of_cpufreq_power_cooling_register(np,
+				policy->related_cpus, power_coefficient, NULL);
 		if (IS_ERR(priv->cdev)) {
 			dev_err(priv->cpu_dev,
 				"running cpufreq without cooling device: %ld\n",
-- 
2.1.4

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#1198958 — [PATCH v2 07/10] hwmon: Support sensors exported via ARM SCP interface

Create a driver to add support for SoC sensors exported by the System
Control Processor (SCP) via the System Control and Power Interface
(SCPI). The supported sensor types is one of voltage, temperature,
current, and power.

The sensor labels and values provided by the SCP are exported via the
hwmon sysfs interface.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Cc: Jean Delvare <jdelvare@suse.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Sudeep Holla <sudeep.holla@arm.com>
---
 Documentation/hwmon/scpi-hwmon |  33 ++++++++
 drivers/hwmon/Kconfig          |   8 ++
 drivers/hwmon/Makefile         |   1 +
 drivers/hwmon/scpi-hwmon.c     | 183 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 225 insertions(+)
 create mode 100644 Documentation/hwmon/scpi-hwmon
 create mode 100644 drivers/hwmon/scpi-hwmon.c

diff --git a/Documentation/hwmon/scpi-hwmon b/Documentation/hwmon/scpi-hwmon
new file mode 100644
index 0000000..4cfcdf2d
--- /dev/null
+++ b/Documentation/hwmon/scpi-hwmon
@@ -0,0 +1,33 @@
+Kernel driver scpi-hwmon
+========================
+
+Supported chips:
+ * Chips based on ARM System Control Processor Interface
+   Addresses scanned: -
+   Datasheet: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0922b/index.html
+
+Author: Punit Agrawal <punit.agrawal@arm.com>
+
+Description
+-----------
+
+This driver supports hardware monitoring for SoC's based on the ARM
+System Control Processor (SCP) implementing the System Control
+Processor Interface (SCPI). The following sensor types are supported
+by the SCP -
+
+  * temperature
+  * voltage
+  * current
+  * power
+
+The SCP interface provides an API to query the available sensors and
+their values which are then exported to userspace by this driver.
+
+Usage Notes
+-----------
+
+The driver relies on device tree node to indicate the presence of SCPI
+support in the kernel. See
+Documentation/devicetree/bindings/arm/arm,scpi.txt for details of the
+devicetree node.
\ No newline at end of file
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 4943c3c..c9714b0 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1551,6 +1551,14 @@ config SENSORS_VEXPRESS
 	  the ARM Ltd's Versatile Express platform. It can provide wide
 	  range of information like temperature, power, energy.
 
+config SENSORS_ARM_SCPI
+	tristate "ARM SCPI Sensors"
+	depends on ARM_SCPI_PROTOCOL
+	help
+	  This driver provides support for temperature, voltage, current
+	  and power sensors available on ARM Ltd's SCP based platforms. The
+	  actual number and type of sensors exported depend the platform.
+
 config SENSORS_VIA_CPUTEMP
 	tristate "VIA CPU temperature sensor"
 	depends on X86
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 8aba87f..4961710 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -150,6 +150,7 @@ obj-$(CONFIG_SENSORS_TMP421)	+= tmp421.o
 obj-$(CONFIG_SENSORS_TWL4030_MADC)+= twl4030-madc-hwmon.o
 obj-$(CONFIG_SENSORS_V2M_JUNO)	+= v2m-juno.o
 obj-$(CONFIG_SENSORS_VEXPRESS)	+= vexpress.o
+obj-$(CONFIG_SENSORS_ARM_SCPI)	+= scpi-hwmon.o
 obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o
 obj-$(CONFIG_SENSORS_VIA686A)	+= via686a.o
 obj-$(CONFIG_SENSORS_VT1211)	+= vt1211.o
diff --git a/drivers/hwmon/scpi-hwmon.c b/drivers/hwmon/scpi-hwmon.c
new file mode 100644
index 0000000..7e7e06b
--- /dev/null
+++ b/drivers/hwmon/scpi-hwmon.c
@@ -0,0 +1,183 @@
+/*
+ * System Control and Power Interface(SCPI) based hwmon sensor driver
+ *
+ * Copyright (C) 2015 ARM Ltd.
+ * Punit Agrawal <punit.agrawal@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include <linux/hwmon.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/scpi_protocol.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+
+struct sensor_data {
+	struct scpi_sensor_info info;
+	struct device_attribute dev_attr_input;
+	struct device_attribute dev_attr_label;
+	char input[20];
+	char label[20];
+};
+
+struct scpi_sensors {
+	struct scpi_ops *scpi_ops;
+	struct sensor_data *data;
+	struct attribute **attrs;
+	struct attribute_group group;
+	const struct attribute_group *groups[2];
+};
+
+/* hwmon callback functions */
+static ssize_t
+scpi_show_sensor(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct scpi_sensors *scpi_sensors = dev_get_drvdata(dev);
+	struct scpi_ops *scpi_ops = scpi_sensors->scpi_ops;
+	struct sensor_data *sensor;
+	u32 value;
+	int ret;
+
+	sensor = container_of(attr, struct sensor_data, dev_attr_input);
+
+	ret = scpi_ops->sensor_get_value(sensor->info.sensor_id, &value);
+	if (ret)
+		return ret;
+
+	return sprintf(buf, "%u\n", value);
+}
+
+static ssize_t
+scpi_show_label(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct sensor_data *sensor;
+
+	sensor = container_of(attr, struct sensor_data, dev_attr_label);
+
+	return sprintf(buf, "%s\n", sensor->info.name);
+}
+
+static int scpi_hwmon_probe(struct platform_device *pdev)
+{
+	u16 nr_sensors, i;
+	int num_temp = 0, num_volt = 0, num_current = 0, num_power = 0;
+	struct scpi_ops *scpi_ops;
+	struct device *hwdev, *dev = &pdev->dev;
+	struct scpi_sensors *scpi_sensors;
+	int ret;
+
+	scpi_ops = get_scpi_ops();
+	if (!scpi_ops)
+		return -EPROBE_DEFER;
+
+	ret = scpi_ops->sensor_get_capability(&nr_sensors);
+	if (ret || !nr_sensors)
+		return ret;
+
+	scpi_sensors = devm_kzalloc(dev, sizeof(*scpi_sensors), GFP_KERNEL);
+	if (!scpi_sensors)
+		return -ENOMEM;
+
+	scpi_sensors->data = devm_kcalloc(dev, nr_sensors,
+				   sizeof(*scpi_sensors->data), GFP_KERNEL);
+	if (!scpi_sensors->data)
+		return -ENOMEM;
+
+	scpi_sensors->attrs = devm_kcalloc(dev, (nr_sensors * 2) + 1,
+				   sizeof(*scpi_sensors->attrs), GFP_KERNEL);
+	if (!scpi_sensors->attrs)
+		return -ENOMEM;
+
+	scpi_sensors->scpi_ops = scpi_ops;
+
+	for (i = 0; i < nr_sensors; i++) {
+		struct sensor_data *sensor = &scpi_sensors->data[i];
+
+		ret = scpi_ops->sensor_get_info(i, &sensor->info);
+		if (ret)
+			return ret;
+
+		switch (sensor->info.class) {
+		case TEMPERATURE:
+			snprintf(sensor->input, sizeof(sensor->input),
+				 "temp%d_input", num_temp + 1);
+			snprintf(sensor->label, sizeof(sensor->input),
+				 "temp%d_label", num_temp + 1);
+			num_temp++;
+			break;
+		case VOLTAGE:
+			snprintf(sensor->input, sizeof(sensor->input),
+				 "in%d_input", num_volt);
+			snprintf(sensor->label, sizeof(sensor->input),
+				 "in%d_label", num_volt);
+			num_volt++;
+			break;
+		case CURRENT:
+			snprintf(sensor->input, sizeof(sensor->input),
+				 "curr%d_input", num_current + 1);
+			snprintf(sensor->label, sizeof(sensor->input),
+				 "curr%d_label", num_current + 1);
+			num_current++;
+			break;
+		case POWER:
+			snprintf(sensor->input, sizeof(sensor->input),
+				 "power%d_input", num_power + 1);
+			snprintf(sensor->label, sizeof(sensor->input),
+				 "power%d_label", num_power + 1);
+			num_power++;
+			break;
+		default:
+			break;
+		}
+
+		sensor->dev_attr_input.attr.mode = S_IRUGO;
+		sensor->dev_attr_input.show = scpi_show_sensor;
+		sensor->dev_attr_input.attr.name = sensor->input;
+
+		sensor->dev_attr_label.attr.mode = S_IRUGO;
+		sensor->dev_attr_label.show = scpi_show_label;
+		sensor->dev_attr_label.attr.name = sensor->label;
+
+		scpi_sensors->attrs[i << 1] = &sensor->dev_attr_input.attr;
+		scpi_sensors->attrs[(i << 1) + 1] = &sensor->dev_attr_label.attr;
+
+		sysfs_attr_init(scpi_sensors->attrs[i << 1]);
+		sysfs_attr_init(scpi_sensors->attrs[(i << 1) + 1]);
+	}
+
+	scpi_sensors->group.attrs = scpi_sensors->attrs;
+	scpi_sensors->groups[0] = &scpi_sensors->group;
+
+	hwdev = devm_hwmon_device_register_with_groups(dev,
+			"scpi_sensors", scpi_sensors, scpi_sensors->groups);
+
+	return PTR_ERR_OR_ZERO(hwdev);
+}
+
+static const struct of_device_id scpi_of_match[] = {
+	{.compatible = "arm,scpi-sensors"},
+	{},
+};
+
+static struct platform_driver scpi_hwmon_platdrv = {
+	.driver = {
+		.name	= "scpi-hwmon",
+		.owner	= THIS_MODULE,
+		.of_match_table = scpi_of_match,
+	},
+	.probe		= scpi_hwmon_probe,
+};
+module_platform_driver(scpi_hwmon_platdrv);
+
+MODULE_AUTHOR("Punit Agrawal <punit.agrawal@arm.com>");
+MODULE_DESCRIPTION("ARM SCPI HWMON interface driver");
+MODULE_LICENSE("GPL v2");
-- 
2.1.4

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#1198959 — [PATCH v2 10/10] arm64: dts: Create SoC thermal zone for Juno

Setup a thermal zone driven by the SoC temperature sensor on Juno
r0. Create passive trip points and bind them to cpufreq cooling
devices that support the power extensions.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
---
 arch/arm64/boot/dts/arm/juno.dts | 50 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/arch/arm64/boot/dts/arm/juno.dts b/arch/arm64/boot/dts/arm/juno.dts
index d2e67f3..664961c 100644
--- a/arch/arm64/boot/dts/arm/juno.dts
+++ b/arch/arm64/boot/dts/arm/juno.dts
@@ -9,6 +9,7 @@
 /dts-v1/;
 
 #include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/thermal/thermal.h>
 
 / {
 	model = "ARM Juno development board (r0)";
@@ -90,6 +91,8 @@
 			next-level-cache = <&A57_L2>;
 			clocks = <&scpi_dvfs 0>;
 			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
+			#cooling-cells = <2>;
+			dynamic-power-coefficient = <530>;
 		};
 
 		A57_1: cpu@1 {
@@ -100,6 +103,8 @@
 			next-level-cache = <&A57_L2>;
 			clocks = <&scpi_dvfs 0>;
 			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
+			#cooling-cells = <2>;
+			dynamic-power-coefficient = <530>;
 		};
 
 		A53_0: cpu@100 {
@@ -110,6 +115,8 @@
 			next-level-cache = <&A53_L2>;
 			clocks = <&scpi_dvfs 1>;
 			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
+			#cooling-cells = <2>;
+			dynamic-power-coefficient = <140>;
 		};
 
 		A53_1: cpu@101 {
@@ -120,6 +127,8 @@
 			next-level-cache = <&A53_L2>;
 			clocks = <&scpi_dvfs 1>;
 			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
+			#cooling-cells = <2>;
+			dynamic-power-coefficient = <140>;
 		};
 
 		A53_2: cpu@102 {
@@ -130,6 +139,8 @@
 			next-level-cache = <&A53_L2>;
 			clocks = <&scpi_dvfs 1>;
 			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
+			#cooling-cells = <2>;
+			dynamic-power-coefficient = <140>;
 		};
 
 		A53_3: cpu@103 {
@@ -140,6 +151,8 @@
 			next-level-cache = <&A53_L2>;
 			clocks = <&scpi_dvfs 1>;
 			cpu-idle-states = <&CPU_SLEEP_0 &CLUSTER_SLEEP_0>;
+			#cooling-cells = <2>;
+			dynamic-power-coefficient = <140>;
 		};
 
 		A57_L2: l2-cache0 {
@@ -167,5 +180,42 @@
 				     <&A53_3>;
 	};
 
+	thermal-zones {
+		soc_thermal {
+			polling-delay = <1000>;
+			polling-delay-passive = <100>;
+			sustainable-power = <2500>;
+
+			thermal-sensors = <&scpi_sensors0 3>;
+
+			trips {
+				threshold: trip-point@0 {
+					temperature = <55000>;
+					hysteresis = <1000>;
+					type = "passive";
+				};
+				target: trip-point@1 {
+					temperature = <65000>;
+					hysteresis = <1000>;
+					type = "passive";
+				};
+			};
+
+			cooling-maps {
+				map0 {
+					trip = <&target>;
+					cooling-device = <&A53_0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+					contribution = <2048>;
+				};
+				map1 {
+					trip = <&target>;
+					cooling-device = <&A57_0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+					contribution = <1024>;
+				};
+
+			};
+		};
+	};
+
 	#include "juno-base.dtsi"
 };
-- 
2.1.4

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