Re: [PATCH v2 10/10] arm64: dts: Create SoC thermal zone for Juno

Punit Agrawal
2015-08-14T12:44:45Z

Apologies for the duplicate, I accidentally Hit send before I finished
the reply.

Punit Agrawal <punit.agrawal@arm.com> writes:

> [ adding Eduardo, Rui for their take on OF-thermal bindings ]
>
> Punit Agrawal <punit.agrawal@arm.com> writes:
>
>> Hi Liviu,
>>
>> Thanks for having a look.
>>
>> Liviu Dudau <Liviu.Dudau@arm.com> writes:
>>
>>> On Mon, Aug 03, 2015 at 04:22:58PM +0100, Punit Agrawal wrote:
>>>> 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.
>>>
>>> Hi Punit,
>>>
>>>>
>>>> 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>;
>>>
>>> The Documentation/devicetree/bindings/thermal/thermal.txt document describes two additional
>>> required properties, cooling-min-state and cooling-max-state which are missing here.
>>>
>>
>> The bindings do suggest that the cooling-*-state are required but I
>> couldn't find any code making use of this property.
>>
>> I'll send a patch with the next version making those properties
>> optional.
>>
>
> On second thoughts...
>
> The question about cooling-*-state has come up in another thread as
> well [0]. I'll re-iterate the question for the thermal maintainers to
> clarify.
>
> The cooling-{max,min}-state properties are marked mandatory in the
> bindings but aren't used in the code anywhere. Can we drop those
> properties from the binding documentation? Or at the least, make them optional?
>

Let me know your preferred approach. I can include a fix in the next version.

[0] http://thread.gmane.org/gmane.linux.ports.ppc.embedded/84512/focus=63339

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