linux-kernel - [PATCH RFC v3 0/2] pmdomain: core: add support for domain hierarchies in DT

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Message-Id: <20250613-pmdomain-hierarchy-onecell-v3-0-5c770676fce7@baylibre.com>
Date: Fri, 13 Jun 2025 15:39:26 -0700
From: Kevin Hilman <khilman@...libre.com>
To: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc: devicetree@...r.kernel.org, linux-pm@...r.kernel.org, 
 arm-scmi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH RFC v3 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 adding support for a nexus node map, as
described in section 2.5.1 of the DT spec.

Signed-off-by: Kevin Hilman <khilman@...libre.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 (2):
      dt-bindings: power: add nexus map for power-domains
      pmdomain: core: add support for subdomains using power-domain-map

 Documentation/devicetree/bindings/power/power-domain.yaml | 35 +++++++++++++++++++++++++++++++++++
 drivers/pmdomain/core.c                                   | 24 ++++++++++++++++++++++--
 2 files changed, 57 insertions(+), 2 deletions(-)
---
base-commit: 0ff41df1cb268fc69e703a08a57ee14ae967d0ca
change-id: 20250528-pmdomain-hierarchy-onecell-a46fad47d855

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