netdev - Re: [PATCH v9 0/2] pwrseq: introduce the subsystem and first driver

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Message-ID: <CAMRc=Mc0Ju6wJUsMw+ap__KUagmDW0pWiF5EzpkfSqdpqRNaig@mail.gmail.com>
Date: Mon, 10 Jun 2024 16:07:07 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Marcel Holtmann <marcel@...tmann.org>, Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
	"David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Kalle Valo <kvalo@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Liam Girdwood <lgirdwood@...il.com>, 
	Mark Brown <broonie@...nel.org>, Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Bartosz Golaszewski <brgl@...ev.pl>, Saravana Kannan <saravanak@...gle.com>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Arnd Bergmann <arnd@...db.de>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Marek Szyprowski <m.szyprowski@...sung.com>, 
	Alex Elder <elder@...aro.org>, Srini Kandagatla <srinivas.kandagatla@...aro.org>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Abel Vesa <abel.vesa@...aro.org>, 
	Manivannan Sadhasivam <mani@...nel.org>, Lukas Wunner <lukas@...ner.de>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Amit Pundir <amit.pundir@...aro.org>, 
	Xilin Wu <wuxilin123@...il.com>
Cc: linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-wireless@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org, 
	linux-pm@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v9 0/2] pwrseq: introduce the subsystem and first driver

On Wed, Jun 5, 2024 at 2:39 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> Hi!
>
> These are the power sequencing patches sent separately after some
> improvements suggested by Bjorn Helgaas. I intend to pick them up into a
> new branch and maintain the subsystem from now on. I then plan to
> provide an immutable tag to the Bluetooth and PCI subsystems so that the
> rest of the C changes can be applied. This new branch will then be
> directly sent to Linus Torvalds for the next merge window.
>
> Changelog:
>
> Since v8:
> - split the pwrseq patches out into their own series
> - rename incref/decref functions to get/put for consistency
> - fix typos
> - make it very explicit in docs that arrays of targets and units must be
>   NULL-terminated
> - Link to v8: https://lore.kernel.org/r/20240528-pwrseq-v8-0-d354d52b763c@linaro.org
>
> Since v7:
> - added DTS changes for sm8650-hdk
> - added circular dependency detection for pwrseq units
> - fixed a KASAN reported use-after-free error in remove path
> - improve Kconfig descriptions
> - fix typos in bindings and Kconfig
> - fixed issues reported by smatch
> - fix the unbind path in PCI pwrctl
> - lots of minor improvements to the pwrseq core
>
> Since v6:
> - kernel doc fixes
> - drop myself from the DT bindings maintainers list for ath12k
> - wait until the PCI bridge device is fully added before creating the
>   PCI pwrctl platform devices for its sub-nodes, otherwise we may see
>   sysfs and procfs attribute failures (due to duplication, we're
>   basically trying to probe the same device twice at the same time)
> - I kept the regulators for QCA6390's ath11k as required as they only
>   apply to this specific Qualcomm package
>
> Since v5:
> - unify the approach to modelling the WCN WLAN/BT chips by always exposing
>   the PMU node on the device tree and making the WLAN and BT nodes become
>   consumers of its power outputs; this includes a major rework of the DT
>   sources, bindings and driver code; there's no more a separate PCI
>   pwrctl driver for WCN7850, instead its power-up sequence was moved
>   into the pwrseq driver common for all WCN chips
> - don't set load_uA from new regulator consumers
> - fix reported kerneldoc issues
> - drop voltage ranges for PMU outputs from DT
> - many minor tweaks and reworks
>
> v1: Original RFC:
>
> https://lore.kernel.org/lkml/20240104130123.37115-1-brgl@bgdev.pl/T/
>
> v2: First real patch series (should have been PATCH v2) adding what I
>     referred to back then as PCI power sequencing:
>
> https://lore.kernel.org/linux-arm-kernel/2024021413-grumbling-unlivable-c145@gregkh/T/
>
> v3: RFC for the DT representation of the PMU supplying the WLAN and BT
>     modules inside the QCA6391 package (was largely separate from the
>     series but probably should have been called PATCH or RFC v3):
>
> https://lore.kernel.org/all/CAMRc=Mc+GNoi57eTQg71DXkQKjdaoAmCpB=h2ndEpGnmdhVV-Q@mail.gmail.com/T/
>
> v4: Second attempt at the full series with changed scope (introduction of
>     the pwrseq subsystem, should have been RFC v4)
>
> https://lore.kernel.org/lkml/20240201155532.49707-1-brgl@bgdev.pl/T/
>
> v5: Two different ways of handling QCA6390 and WCN7850:
>
> https://lore.kernel.org/lkml/20240216203215.40870-1-brgl@bgdev.pl/
>
> Bartosz Golaszewski (2):
>   power: sequencing: implement the pwrseq core
>   power: pwrseq: add a driver for the PMU module on the QCom WCN
>     chipsets
>
>  MAINTAINERS                                |    8 +
>  drivers/power/Kconfig                      |    1 +
>  drivers/power/Makefile                     |    1 +
>  drivers/power/sequencing/Kconfig           |   29 +
>  drivers/power/sequencing/Makefile          |    6 +
>  drivers/power/sequencing/core.c            | 1105 ++++++++++++++++++++
>  drivers/power/sequencing/pwrseq-qcom-wcn.c |  336 ++++++
>  include/linux/pwrseq/consumer.h            |   56 +
>  include/linux/pwrseq/provider.h            |   75 ++
>  9 files changed, 1617 insertions(+)
>  create mode 100644 drivers/power/sequencing/Kconfig
>  create mode 100644 drivers/power/sequencing/Makefile
>  create mode 100644 drivers/power/sequencing/core.c
>  create mode 100644 drivers/power/sequencing/pwrseq-qcom-wcn.c
>  create mode 100644 include/linux/pwrseq/consumer.h
>  create mode 100644 include/linux/pwrseq/provider.h
>
> --
> 2.40.1
>

With no objections, I plan to pick it up into its own pwrseq branch on
Wednesday.

Review and Ack tags are welcome.

Bartosz