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

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Date:   Thu, 23 Dec 2021 14:32:27 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     rjw@...ysocki.net, lukasz.luba@....com, robh@...nel.org,
        heiko@...ech.de, arnd@...aro.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v5 0/6] powercap/drivers/dtpm: Create the dtpm hierarchy

On Thu, 23 Dec 2021 at 14:20, Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>
> 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?

FYI, I intend to have a closer look at the series next week. Happy holidays!

Kind regards
Uffe

>
> 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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