[PATCH v4 0/3] watchdog: npcm: Add reset status detection support

[Tomer Maimon <tmaimon77@gmail.com>]

This series documents and implements reset indication reporting for the
NPCM watchdog driver on NPCM7xx and NPCM8xx systems, and documents the
optional GCR syscon property used by that support.

Patch 1 updates the watchdog binding to allow the optional
``nuvoton,sysgcr`` property used for reset-cause reporting.
Patch 2 adds watchdog documentation that describes the bootstatus
mapping.
Patch 3 reads the SoC reset indication bits and maps them into the
existing watchdog bootstatus flags for NPCM750 and NPCM845, while
leaving WPCM450 unchanged.

Addressed comments from:
- Conor Dooley: https://patchwork.ozlabs.org/project/openbmc/patch/20260705140100.1543486-2-tmaimon77@gmail.com/

Changes since version 3:
- make GCR syscon-property conditional.

Changes since version 2:
- reword patch 1 to explain the hardware reason for the GCR phandle and
  why it is needed for the reset-status support, per Krzysztof's review
- cache NPCM750 reset status in SCRPAD2 so later watchdog probes can
  report the same boot-time state

Changes since version 1:
- Modify reset detection handle in the watchodg.
- reword patch 1 to use the GCR syscon-property wording from the
  applied NPCM reset binding update and drop the optional property from
  the binding example.
- reword the patch subjects and commit message bodies to match current
  kernel dt-bindings, docs, and watchdog style.

Tomer Maimon (3):
  dt-bindings: watchdog: npcm: add GCR syscon property
  docs: watchdog: npcm: Add reset status description
  watchdog: npcm: add bootstatus support

 .../watchdog/nuvoton,npcm750-wdt.yaml         |  14 ++
 Documentation/watchdog/index.rst              |   1 +
 Documentation/watchdog/npcm_wdt.rst           |  71 ++++++
 drivers/watchdog/npcm_wdt.c                   | 217 +++++++++++++++++-
 4 files changed, 301 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/watchdog/npcm_wdt.rst

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2.34.1