[PATCH v5 0/8] Add support for mt8167 toprgu and mmsys resets

[Luca Leonardo Scorcia <l.scorcia@gmail.com>]

Currently mt8167 inherits its watchdog from the included mt8516 dtsi,
which in turn falls back on mt6589-wdt, which does not support toprgu
resets yet. In the first two patches we add support for the 12 mt6589
toprgu resets.

However, according to its data sheet, mt8167 has 14 sw resets instead of
12, and its reset bits are non-contiguous. This is currently unsupported
by the mtk-wdt driver and it caused confusion between reset IDs and reset
bits in other mtk SoCs device tree includes.

Therefore we introduce a dedicated mediatek,mt8167-wdt compatible for the
watchdog driver that describes correctly this SoC's resets. Since its
reset bits are non-contiguous, we add support for a watchdog reset table
to accommodate the distinction between device tree reset IDs and the
actual bits in the registers. Code is inspired by the reset table
currently implemented in the mmsys driver. There should be no effect
on existing sequential wdt resets.

In the last three patches we describe the mmsys reset table for the SoC.
According to the datasheet there are 28 mmsys reset bits divided across
two adjacent registers.

The series has been tested on a Sony PlayStation Classic Mini, on a Xiaomi
Mi Smart Clock and on a Lenovo Smart Clock 2.

Changes in v5:
- Dropped the binding header for mt6589 reset IDs;
- Moved the definition of the number of resets for mt6589 inside
  mtk-wdt driver;
- Separated the mmsys related changes to the last three commits.

Changes in v4 [4]:
- Squashed the reset IDs includes together with the bindings change;
- Added support for a reset table to the mtk-wdt driver. This allows us
  to decouple reset IDs from device trees from reset bits and lets us
  describe correctly the non-contiguous reset bits of mt8167;
- Improved explanations in commit messages.

Changes in v3 [3]:
- Improved explanations in the commit messages;
- Added the #reset-cells property to mt6589 watchdog node;
- Included the mediatek,mt6589-resets.h file in mt6589.dtsi;
- Included the mediatek,mt8167-resets.h file in mt8167.dtsi;
- Moved the mmsys reset table from the mt8167-mmsys.h header file to
  the mmsys driver implementation.

Changes in v2 [2]:
- Sashiko pointed out correctly a missing entry in the mmsys reset table
  in the last patch.

Initial version: [1]

[1] https://lore.kernel.org/linux-mediatek/20260717151134.678839-1-l.scorcia@gmail.com/
[2] https://lore.kernel.org/linux-mediatek/20260717163959.714561-1-l.scorcia@gmail.com/
[3] https://lore.kernel.org/linux-mediatek/20260809160643.33991-1-l.scorcia@gmail.com/
[4] https://lore.kernel.org/linux-mediatek/20260819101853.44681-1-l.scorcia@gmail.com/

Luca Leonardo Scorcia (8):
  watchdog: mediatek: Add wdt/toprgu resets for mt6589
  arm: dts: mediatek: mt6589: Enable toprgu reset controller
  dt-bindings: watchdog: Add compatible for MediaTek mt8167
  watchdog: mediatek: Add support for mt8167 toprgu/watchdog
  arm64: dts: mt8167: Properly describe the SoC watchdog resets
  dt-bindings: reset: Add mmsys reset ids for mt8167
  soc: mediatek: mtk-mmsys: Add resets for mt8167
  arm64: dts: mt8167: Add support for mmsys resets

 .../bindings/watchdog/mediatek,mtk-wdt.yaml   |  1 +
 arch/arm/boot/dts/mediatek/mt6589.dtsi        |  1 +
 arch/arm64/boot/dts/mediatek/mt8167.dtsi      |  9 ++++
 drivers/soc/mediatek/mt8167-mmsys.h           |  3 ++
 drivers/soc/mediatek/mtk-mmsys.c              | 38 +++++++++++++
 drivers/watchdog/mtk_wdt.c                    | 54 +++++++++++++++++--
 .../dt-bindings/reset/mediatek,mt8167-mmsys.h | 35 ++++++++++++
 .../dt-bindings/reset/mediatek,mt8167-wdt.h   | 21 ++++++++
 8 files changed, 157 insertions(+), 5 deletions(-)
 create mode 100644 include/dt-bindings/reset/mediatek,mt8167-mmsys.h
 create mode 100644 include/dt-bindings/reset/mediatek,mt8167-wdt.h

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2.43.0