linux-kernel - Re: [PATCH v5 0/6] powercap/drivers/dtpm: Create the dtpm hierarchy

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Date:   Thu, 23 Dec 2021 14:20:34 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     rjw@...ysocki.net
Cc:     lukasz.luba@....com, robh@...nel.org, heiko@...ech.de,
        arnd@...aro.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, ulf.hansson@...aro.org
Subject: Re: [PATCH v5 0/6] powercap/drivers/dtpm: Create the dtpm hierarchy

Hi all,

any comments on this series. Is it fine if I merge it without patch 6/6?

Heiko, is the description fine for you in the SoC specific code?

Thanks
  -- Daniel

On 18/12/2021 14:00, Daniel Lezcano wrote:
> The DTPM hierarchy is the base to build on top of it a power budget
> allocator. It reflects the power consumption of the group of devices
> and allows to cap their power.
> 
> The core code is there but there is no way to describe the desired
> hierarchy yet.
> 
> A first proposal introduced the description through configfs [1] but
> was rejected [2].
> 
> A second proposal based on the device tree with a binding similar to
> the power domains [3] was proposed but finally rejected [4].
> 
> This fifth version delegates the hierarchy creation to the SoC with a
> specific and self-encapsulated code using an array to describe the tree. The
> SoC DTPM driver defines an array of nodes pointing to their parents.  The
> hierarchy description can integrate a DT node and in the future a SCMI node,
> that means the description can mix different type of nodes.
> 
> In addition to the hierarchy creation, the devfreq dtpm support is also
> integrated into this series.
> 
> This series was tested on a rock960 (revision B - rk3399 based) and a
> db845c (Qualcomm sdm845 based).
> 
> [1] https://lore.kernel.org/all/20210401183654.27214-1-daniel.lezcano@linaro.org/
> [2] https://lore.kernel.org/all/YGYg6ZeZ1181%2FpXk@kroah.com/
> [3] https://lore.kernel.org/all/20211205231558.779698-1-daniel.lezcano@linaro.org/
> [4] https://lore.kernel.org/all/YbfFapsmsjs4qnsg@robh.at.kernel.org/
> 
> Changelog:
>    V5:
>    - Remove DT bindings
>    - Added description with an array
>    - Added simple description for rk3399 and sdm845
>    - Moved dtpm table to the data section
>    
>    V4:
>    - Added missing powerzone-cells
>    - Changed powerzone name to comply with the pattern property
> 
>    V3:
>    - Remove GPU section as no power is available (yet)
>    - Remove '#powerzone-cells' conforming to the bindings change
>    - Removed required property 'compatible'
>    - Removed powerzone-cells from the topmost node
>    - Removed powerzone-cells from cpus 'consumers' in example
>    - Set additionnal property to false
> 
>    V2:
>    - Added pattern properties and stick to powerzone-*
>    - Added required property compatible and powerzone-cells
>    - Added additionnal property
>    - Added compatible
>    - Renamed to 'powerzones'
>    - Added missing powerzone-cells to the topmost node
>    - Fixed errors reported by 'make DT_CHECKER_FLAGS=-m dt_binding_check'
>    - Move description in the SoC dtsi specific file
>    - Fixed missing prototype warning reported by lkp@
> 
>    V1: Initial post
> 
> Daniel Lezcano (6):
>   powercap/drivers/dtpm: Move dtpm table from init to data section
>   powercap/drivers/dtpm: Add hierarchy creation
>   powercap/drivers/dtpm: Add CPU DT initialization support
>   powercap/drivers/dtpm: Add dtpm devfreq with energy model support
>   rockchip/soc/drivers: Add DTPM description for rk3399
>   qcom/soc/drivers: Add DTPM description for sdm845
> 
>  drivers/powercap/Kconfig          |   8 ++
>  drivers/powercap/Makefile         |   1 +
>  drivers/powercap/dtpm.c           | 155 ++++++++++++++++++++++-
>  drivers/powercap/dtpm_cpu.c       |  37 ++++--
>  drivers/powercap/dtpm_devfreq.c   | 201 ++++++++++++++++++++++++++++++
>  drivers/soc/qcom/Kconfig          |   9 ++
>  drivers/soc/qcom/Makefile         |   1 +
>  drivers/soc/qcom/dtpm.c           |  65 ++++++++++
>  drivers/soc/rockchip/Kconfig      |   8 ++
>  drivers/soc/rockchip/Makefile     |   1 +
>  drivers/soc/rockchip/dtpm.c       |  56 +++++++++
>  include/asm-generic/vmlinux.lds.h |   4 +-
>  include/linux/dtpm.h              |  21 +++-
>  13 files changed, 551 insertions(+), 16 deletions(-)
>  create mode 100644 drivers/powercap/dtpm_devfreq.c
>  create mode 100644 drivers/soc/qcom/dtpm.c
>  create mode 100644 drivers/soc/rockchip/dtpm.c
> 


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