linux-kernel - Re: [PATCH RFC v4 0/2] pmdomain: core: add support for domain hierarchies in DT

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Message-ID: <CAPDyKFor41f=-vpaborhOziYu1RSnxL6-mezBQTHLPVM_TEAuA@mail.gmail.com>
Date: Mon, 8 Dec 2025 13:25:29 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: "Kevin Hilman (TI.com)" <khilman@...libre.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, devicetree@...r.kernel.org, 
	linux-pm@...r.kernel.org, arm-scmi@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v4 0/2] pmdomain: core: add support for domain
 hierarchies in DT

On Thu, 20 Nov 2025 at 01:58, Kevin Hilman (TI.com)
<khilman@...libre.com> wrote:
>
> Currently, PM domains can only support hierarchy for simple
> providers (e.g. ones with #power-domain-cells = 0).
>
> Add more generic support by creating an of_genpd helper which can
> parse a nexus node map, and create domain hierarchy.
>
> described in section 2.5.1 of the DT spec.

Even if that is generally described, shouldn't we update the generic
DT doc for power-domains [1] to mention this too?

At least we should show some examples of how this can be used.

>
> Signed-off-by: Kevin Hilman <khilman@...libre.com>
> ---
> Changes in v4:
> - use new OF iterator for parsing map. See:
>   https://lore.kernel.org/r/20251119-topic-lpm-of-map-iterator-v6-18-v1-1-1f0075d771a3@baylibre.com
> - instead of mapping on probe, create of_genpd helper to be called by providers
> - Link to v3: https://lore.kernel.org/r/20250613-pmdomain-hierarchy-onecell-v3-0-5c770676fce7@baylibre.com
>
> Changes in v3:
> - use of_parse_phandle_with_args_map() instead of custom parsing
> - probe when device is attatched to PM domain
> - Link to v2: https://lore.kernel.org/r/20250528-pmdomain-hierarchy-onecell-v2-0-7885ae45e59c@baylibre.com
>
> Changes in v2:
> - Use nexus map instead of creating new property as suggested by Rob H.
> - Link to v1: https://lore.kernel.org/r/20250528-pmdomain-hierarchy-onecell-v1-1-851780700c68@baylibre.com
>
> ---
> Kevin Hilman (TI.com) (2):
>       pmdomain: core: support domain hierarchy via power-domain-map
>       pmdomain: arm_scmi: add support for domain hierarchies
>
>  drivers/pmdomain/arm/scmi_pm_domain.c | 11 ++++--
>  drivers/pmdomain/core.c               | 64 ++++++++++++++++++++++++++++++++++
>  include/linux/pm_domain.h             |  9 +++++
>  3 files changed, 82 insertions(+), 2 deletions(-)
> ---
> base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
> change-id: 20250528-pmdomain-hierarchy-onecell-a46fad47d855
> prerequisite-change-id: 20251119-topic-lpm-of-map-iterator-v6-18-a61447423adc:v1
> prerequisite-patch-id: e2c4a8c727d0f172166cfa622e60d97048a97b26
>
> Best regards,
> --
> Kevin Hilman (TI.com) <khilman@...libre.com>
>

Thanks for continuing to work on this! I will look into the series asap.

Kind regards
Uffe

[1]
Documentation/devicetree/bindings/power/power-domain.yaml