[PATCH 00/21] thermal: exynos: Thermal code rework to use device tree

[l.majewski@samsung.com (Lukasz Majewski)]

Hi Lukasz,

> 1. Introduction
> 
> Following patches aim to clean up the current implementation of the
> thermal framework on Exynos devices.
> 
> The main goal was to use a generic code for reading thermal
> configuration (of-thermal.c). Due to that redundant
> exynos_thermal_common.[h|c] files were removed.
> 
> Around 400 lines of code (LOC) were removed directly by this patch,
> which is around 20% of the Exynos thermal code base.
> 
> This work should NOT bring any functional changes to Exynos thermal 
> subsystem.
> 
> 2. Patch-set structure
> 
> This series starts with extending current of-thermal.c implementation
> with exporting information about trip points and support for setting
> emulated temperature. Those changes were necessary to reuse this code
> in Exynos.
> 
> Then the cpu_cooling functionality has been preserved to allow cooling
> devices by reducing operating frequency. Definition of trip points and
> cpufreq's cooling properties were moved to device tree.
> 
> Then the rework of the way in which configuration data is provided to
> the Exynos thermal subsystem was performed. Now device tree is used
> for configuration.
> 
> Patch series end with removing exynos5250/exynos3250 TMU compatibles.
> Both SoCs have thermal management unit (TMU) compatible with the one
> first introduced at Exynos4412.
> 
> 3. Dead code removal
> 
> Thermal support for some SoCs, previously available in the
> exynos_tmu_data.c file, was removed since, as of 3.17-rc6, they
> didn't have TMU bindings.
> 
> Moreover, support for cpu_cooling devices was preserved only on those
> SoCs which had available and working cpufreq driver.
> 
> 4. Testing
> 
> Test devices:
> - Exynos4210 - Trats (TMU zone + cpu_cooling)
> - Exynos4412 - Trats2/Odroid U3 (TMU zone + cpu_cooling)
> - Exynos5250 - Arndale (TMU zone + cpu_cooling)
> - Exynos5420 - Arndale-octa (only TMU zones)
> 
> Unfortunately, I don't posses Exynos5440 for testing. Its
> functionality has been preserved in the code, but not tested on the
> hardware. I would be grateful for help in testing.
> 
> 5. Prerequisites:
> 
> This work requires following patches developed by Bartlomiej
> Zolnierkiewicz:
> 
> 5.1. [PATCH v3] ARM: dts: add CPU nodes for Exynos4 SoCs
> http://article.gmane.org/gmane.linux.kernel.samsung-soc/37946/match=patch+v3+arm+dts+add+cpu+nodes+exynos4+socs
> 
> 5.2. First thermal clean up patch set (from patch 1 to 33):
> 
> [PATCH 00/33] thermal: exynos: convert the driver to use per-SoC type
> operations
> http://article.gmane.org/gmane.linux.kernel.samsung-soc/37642/match=patch+00+33+thermal+exynos+convert+driver+use+per+soc+type+operations
> 

Any comments on this patch set (despite the ones from Chanwoo)?

I'm especially wondering if changes introduced to of-thermal.c file are
appropriate for mainline.

> 
> Lukasz Majewski (21):
>   thermal: of: Extend of-thermal.c to provide number of trip points
>   thermal: of: Extend of-thermal.c to provide check if trip point is
>     enabled
>   thermal: of: Extend of-thermal.c to provide number of non critical
>     trip points
>   thermal: of: Extend current of-thermal.c code to allow setting
>     emulated temp
>   thermal: exynos: cosmetic: Correct comment format
>   thermal: exynos: Provide thermal_exynos.h file to be included in
>     device tree files
>   thermal: dts: trats: Enable TMU on the Exynos4210 trats device
>   thermal: dts: exynos: Adding LD010 regulator node necessary for TMU
> on Odroid U3 board
>   thermal: dts: Provide bindings and enable TMU at Exynos4x12 devices
>   thermal: cpu_cooling: dts: Define device tree bindings for Exynos
> cpu cooling functionality
>   thermal: cpu_cooling: Modify exynos thermal code to use device tree
>     for cpu cooling configuration
>   thermal: exynos: dts: Add default definition for the TMU sensor
>   thermal: dts: Default trip points definition for Exynos5420 SoCs
>   thermal: exynos: dts: Define default thermal-zones for Exynos4
>   thermal: dts: exynos: Trip points and sensor configuration data for
>     Exynos5440
>   thermal: exynos: dts: Provide device tree bindings identical to one
> in exynos_tmu_data.c
>   thermal: samsung: core: Exynos TMU rework to use device tree for
>     configuration
>   thermal: exynos: Remove exynos_thermal_common.[c|h] files
>   thermal: exynos: Remove exynos_tmu_data.c file
>   thermal: exynos: Make Exynos5250 TMU compatible with Exynos4412
>   thermal: exynos: Make Exynos3250 TMU compatible with Exynos4412
> 
>  arch/arm/boot/dts/exynos4-cpu-thermal.dtsi        |  52 +++
>  arch/arm/boot/dts/exynos4.dtsi                    |   5 +
>  arch/arm/boot/dts/exynos4210-trats.dts            |  19 +
>  arch/arm/boot/dts/exynos4210.dtsi                 |  28 +-
>  arch/arm/boot/dts/exynos4212.dtsi                 |   5 +-
>  arch/arm/boot/dts/exynos4412-odroid-common.dtsi   |  27 ++
>  arch/arm/boot/dts/exynos4412-tmu-sensor-conf.dtsi |  24 ++
>  arch/arm/boot/dts/exynos4412.dtsi                 |   5 +-
>  arch/arm/boot/dts/exynos4x12.dtsi                 |  13 +
>  arch/arm/boot/dts/exynos5250.dtsi                 |  29 +-
>  arch/arm/boot/dts/exynos5420-trip-points.dtsi     |  35 ++
>  arch/arm/boot/dts/exynos5420.dtsi                 |  33 ++
>  arch/arm/boot/dts/exynos5440-tmu-sensor-conf.dtsi |  25 ++
>  arch/arm/boot/dts/exynos5440-trip-points.dtsi     |  25 ++
>  arch/arm/boot/dts/exynos5440.dtsi                 |  18 +
>  drivers/cpufreq/exynos-cpufreq.c                  |  23 +-
>  drivers/thermal/of-thermal.c                      |  52 ++-
>  drivers/thermal/samsung/Makefile                  |   2 -
>  drivers/thermal/samsung/exynos_thermal_common.c   | 430
> ----------------------
> drivers/thermal/samsung/exynos_thermal_common.h   | 106 ------
> drivers/thermal/samsung/exynos_tmu.c              | 283
> +++++++------- drivers/thermal/samsung/exynos_tmu.h              |
> 79 +--- drivers/thermal/samsung/exynos_tmu_data.c         | 264
> ------------- drivers/thermal/thermal_core.h                    |  15
> + include/dt-bindings/thermal/thermal_exynos.h      |  40 ++
> include/linux/thermal.h                           |   6 +- 26 files
> changed, 623 insertions(+), 1020 deletions(-) create mode 100644
> arch/arm/boot/dts/exynos4-cpu-thermal.dtsi create mode 100644
> arch/arm/boot/dts/exynos4412-tmu-sensor-conf.dtsi create mode 100644
> arch/arm/boot/dts/exynos5420-trip-points.dtsi create mode 100644
> arch/arm/boot/dts/exynos5440-tmu-sensor-conf.dtsi create mode 100644
> arch/arm/boot/dts/exynos5440-trip-points.dtsi delete mode 100644
> drivers/thermal/samsung/exynos_thermal_common.c delete mode 100644
> drivers/thermal/samsung/exynos_thermal_common.h delete mode 100644
> drivers/thermal/samsung/exynos_tmu_data.c create mode 100644
> include/dt-bindings/thermal/thermal_exynos.h
> 


-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group