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

Punit Agrawal
2015-08-03T15:24:00Z

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

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2.1.4