linux-kernel - [PATCH v4 00/10] pmdomain: samsung: add support for Google GS101

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Message-Id: <20260128-gs101-pd-v4-0-cbe7bd5a4060@linaro.org>
Date: Wed, 28 Jan 2026 16:10:49 +0000
From: André Draszik <andre.draszik@...aro.org>
To: Krzysztof Kozlowski <krzk@...nel.org>, 
 Alim Akhtar <alim.akhtar@...sung.com>, Rob Herring <robh@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Ulf Hansson <ulf.hansson@...aro.org>, Liam Girdwood <lgirdwood@...il.com>, 
 Mark Brown <broonie@...nel.org>
Cc: Peter Griffin <peter.griffin@...aro.org>, 
 Tudor Ambarus <tudor.ambarus@...aro.org>, Juan Yescas <jyescas@...gle.com>, 
 Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com, 
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-pm@...r.kernel.org, 
 André Draszik <andre.draszik@...aro.org>, 
 Marek Szyprowski <m.szyprowski@...sung.com>, 
 Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH v4 00/10] pmdomain: samsung: add support for Google GS101

Hi,

This series adds support for the power domains on Google GS101.

There are a few differences compared to SoCs already supported by this
driver:
* register access does not work via plain ioremap() / readl() /
  writel().
  Instead, the regmap created by the PMU driver must be used (which
  uses Arm SMCC calls under the hood).
* DTZPC: a call needs to be made before and after power domain off/on,
  to inform the EL3 firmware of the request.
* power domains can and are fed by a regulator rail and therefore
  regulator control needed be implemented.

Bullet points 2 and 3 are new compared to previous versions of this
series, and related changes are in patches 1, 2, 9, and 10. I can merge
patch 9 (SMC call) into the gs101 patch (patch 7) if preferred, but for
now I kept them independent to make it easier to see changes compared
to previous versions of this series, and because patch 8 actually
applies to not only gs101, but to many newer Exynos SoCs, and to make
the two patches themselves easier to review and reason about.

The DT update to add the new required properties on gs101 will be
posted separately.

Signed-off-by: André Draszik <andre.draszik@...aro.org>
---
Changes in v4:
- drop unneeded or already merged patches
- drop patch "pmdomain: samsung: convert to regmap_read_poll_timeout()"
  as Marek reported issues on some platforms
- rebase
- DTZPC related changes
- Link to v3: https://lore.kernel.org/r/20251016-gs101-pd-v3-0-7b30797396e7@linaro.org

Changes in v3:
- use additionalProperties, not unevaluatedProperties in patch 2
- fix path in $id in patch 2 (Rob)
- drop comment around 'select' in patch 2 (Rob)
- collect tags
- Link to v2: https://lore.kernel.org/r/20251009-gs101-pd-v2-0-3f4a6db2af39@linaro.org

Changes in v2:
- Krzysztof:
  - move google,gs101-pmu binding into separate file
  - mark devm_kstrdup_const() patch as fix
  - use bool for need_early_sync_state
  - merge patches 8 and 10 from v1 series into one patch
- collect tags
- Link to v1: https://lore.kernel.org/r/20251006-gs101-pd-v1-0-f0cb0c01ea7b@linaro.org

---
André Draszik (10):
      dt-bindings: soc: google: add google,gs101-dtzpc
      dt-bindings: power: samsung: add google,gs101-pd
      dt-bindings: soc: samsung: exynos-pmu: move gs101-pmu into separate binding
      dt-bindings: soc: google: gs101-pmu: allow power domains as children
      pmdomain: samsung: convert to using regmap
      pmdomain: samsung: don't hard-code offset for registers to 0 and 4
      pmdomain: samsung: add support for google,gs101-pd
      pmdomain: samsung: use dev_err() instead of pr_err()
      pmdomain: samsung: implement SMC to save / restore TZ config
      pmdomain: samsung: implement domain-supply regulator

 .../devicetree/bindings/power/pd-samsung.yaml      |  29 ++-
 .../bindings/soc/google/google,gs101-dtzpc.yaml    |  42 ++++
 .../bindings/soc/google/google,gs101-pmu.yaml      |  97 ++++++++
 .../bindings/soc/samsung/exynos-pmu.yaml           |  20 --
 MAINTAINERS                                        |   2 +
 drivers/pmdomain/samsung/exynos-pm-domains.c       | 254 ++++++++++++++++++---
 6 files changed, 395 insertions(+), 49 deletions(-)
---
base-commit: e3b32dcb9f23e3c3927ef3eec6a5842a988fb574
change-id: 20251001-gs101-pd-d4dc97d70a84

Best regards,
-- 
André Draszik <andre.draszik@...aro.org>