linux-kernel - Re: [PATCH v6 0/4] Tegra124 soctherm driver

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Message-ID: <20140926114852.GO31106@ulmo>
Date:	Fri, 26 Sep 2014 13:48:53 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Mikko Perttunen <mikko.perttunen@...si.fi>
Cc:	Mikko Perttunen <cyndis@...si.fi>, edubezval@...il.com,
	swarren@...dotorg.org, linux-pm@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, juha-matti.tilli@....fi
Subject: Re: [PATCH v6 0/4] Tegra124 soctherm driver

On Fri, Sep 26, 2014 at 01:22:52PM +0300, Mikko Perttunen wrote:
> On 09/26/2014 01:19 PM, Thierry Reding wrote:
> >On Fri, Sep 26, 2014 at 12:43:09PM +0300, Mikko Perttunen wrote:
> >>Hi,
> >>
> >>this series adds support for the thermal monitoring features of the
> >>soctherm unit on the Tegra124 SoC.
> >>
> >>The branch is also available in my github repo,
> >>   git://github.com/cyndis/linux.git soctherm-v6
> >>
> >>Thanks,
> >>Mikko
> >>
> >>Mikko Perttunen (4):
> >>   of: Add bindings for nvidia,tegra124-soctherm
> >>   ARM: tegra: Add soctherm and thermal zones to Tegra124 device tree
> >>   ARM: tegra: Add thermal trip points for Jetson TK1
> >>   thermal: Add Tegra SOCTHERM thermal management driver
> >>
> >>  .../devicetree/bindings/thermal/tegra-soctherm.txt |  53 +++
> >>  arch/arm/boot/dts/tegra124-jetson-tk1.dts          |  44 ++
> >>  arch/arm/boot/dts/tegra124.dtsi                    |  47 ++
> >>  drivers/thermal/Kconfig                            |  10 +
> >>  drivers/thermal/Makefile                           |   1 +
> >>  drivers/thermal/tegra_soctherm.c                   | 471 +++++++++++++++++++++
> >>  include/dt-bindings/thermal/tegra124-soctherm.h    |  13 +
> >>  7 files changed, 639 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/thermal/tegra-soctherm.txt
> >>  create mode 100644 drivers/thermal/tegra_soctherm.c
> >>  create mode 100644 include/dt-bindings/thermal/tegra124-soctherm.h
> >
> >One thing that I've wanted to start doing for a while now is request
> >patch submissions like this to come accompanied with a way on how to
> >test them. Ideally this would be in a scripted way that can test for
> >success programatically, but it doesn't necessarily have to be if it
> >turns out too difficult or impractical to do.
> 
> Indeed, that would be very useful.
> 
> >
> >The goal is to eventually come up with a test suite that can run the
> >majority of test cases automatically to make it easy to test for any
> >regressions. And even if tests can't be run automatically it'd still
> >be an advantage to have them all collected in some repository, since
> >it saves a lot of typing and time to run tests, and it will give us
> >a standard set of tests that everybody can verify changes against.
> >
> >I realize that it's somewhat unfair to start requesting this from you
> >now, but we've got to start somewhere. Could you give a short summary
> >of how you test this? What are the interfaces that the kernel exposes
> >for these thermal drivers?
> 
> You need to enable the driver in Device Drivers -> Generic Thermal sysfs
> driver -> Tegra SOCTHERM thermal management. Then, you should see
> directories appear in /sys/class/thermal. You can also use the `tmon' tool
> included in the kernel tree to quickly see values; that's what I use for
> testing.

Okay. So what are expected values for these temperatures? It's going to
be pretty much impossible to say what the correct value is on a given
board at any time, but perhaps a "test" could consist of checking that
all temperatures are within a reasonable range.

Thierry

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