linux-kernel - [PATCH RFC v5 0/2] pmdomain: core: add support for domain hierarchies in DT

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Message-Id: <20260122-pmdomain-hierarchy-onecell-v5-0-76855ec856bd@baylibre.com>
Date: Thu, 22 Jan 2026 17:13:59 -0800
From: "Kevin Hilman (TI)" <khilman@...libre.com>
To: Ulf Hansson <ulf.hansson@...aro.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Sudeep Holla <sudeep.holla@....com>, 
 Cristian Marussi <cristian.marussi@....com>
Cc: devicetree@...r.kernel.org, linux-pm@...r.kernel.org, 
 arm-scmi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org
Subject: [PATCH RFC v5 0/2] pmdomain: core: add support for domain
 hierarchies in DT

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.

Signed-off-by: Kevin Hilman (TI) <khilman@...libre.com>
---
Changes in v5:
- update subdomain language to parent/child
- add remove function to remove all children
- if any children in the map fail to add, remove them all
- Link to v4: https://patch.msgid.link/20251119-pmdomain-hierarchy-onecell-v4-0-f25a1d5022f8@baylibre.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) (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 |   5 +++++
 drivers/pmdomain/core.c               | 160 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/pm_domain.h             |  16 ++++++++++++++++
 3 files changed, 181 insertions(+)
---
base-commit: 3e7f562e20ee87a25e104ef4fce557d39d62fa85
change-id: 20250528-pmdomain-hierarchy-onecell-a46fad47d855
prerequisite-change-id: 20251119-topic-lpm-of-map-iterator-v6-18-a61447423adc:v2
prerequisite-patch-id: e5697df059c17cf967fa6e4b1edb70874fee4ad3

Best regards,
--  
Kevin Hilman (TI) <khilman@...libre.com>