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

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/[email protected]/

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