[PATCH v3 0/3] watchdog: mtk_wdt: refactor code to support more watchdogs

[Boris Lysov]

This series aims to refactor existing mtk_wdt driver by making some
constants dependent on a particular SoC. It is done because some mtk
watchdogs, while working in same manner, have slightly different
parameters such as specific register unlock key value and an offset of a
particular register field.

This patch set adds support for mt6577 watchdog.

Accepting these patches will make ground for submitting additional
changes related to the mainline support of mt6577 (and other compatible
SoCs) in future.

Proposed patches successfully pass all `checkpatch.pl` checks and don't
yield compiler warnings.

Resulting code has been thoroughly tested multiple times for hours on
real hardware (mt6577, mt6589) to ensure that proposed changes are
working properly.

Changes since v2 [3]:
- rename the newly introduced structure element ('data' -> 'config') to
  avoid changing the names of already existing variables; suggested [4]
  by Guenter Roeck.

Changes since v1 [1]:
- a complete rewrite to get rid of the configuration flags which made
  the watchdog not support other SoCs; suggested [2] by Guenter Roeck.

[1] https://lore.kernel.org/linux-mediatek/20210131234425.9773-1-arzamas-16@mail.ee/
[2] https://lore.kernel.org/linux-mediatek/050f2f8e-9c3c-10e3-05ef-cd84e949b98f@roeck-us.net/
[3] https://lore.kernel.org/linux-mediatek/20210509211702.549-1-arzamas-16@mail.ee/
[4] https://lore.kernel.org/linux-mediatek/efdce3a5-e5b4-19a8-35f1-8a536220bb3f@roeck-us.net/

Boris Lysov (3):
  watchdog: mtk_wdt: Refactor code to support more SoCs
  dt-bindings: watchdog: mediatek: add support for mt6577 SoC
  watchdog: mtk_wdt: add support for mt6577

 .../devicetree/bindings/watchdog/mtk-wdt.txt  |  1 +
 drivers/watchdog/mtk_wdt.c                    | 88 +++++++++++++++----
 2 files changed, 70 insertions(+), 19 deletions(-)

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2.20.1