[v7,0/5] watchdog: mt7621-wdt: avoid globals and arch dependencies

Message

Sergio Paracuellos Feb. 14, 2023, 10:39 a.m. UTC

Hi all,

This series make an update in the MT7621 SoC's watchdog driver code. This
SoC already provides a system controller node to access reset status
register needed for the watchdog. Instead of using MIPS architecture
dependent operations in header 'asm/mach-ralink/ralink_regs.h' use
a phandle to the system controller node and use it through regmap APIs
from the code. Driver is also using some globals that are not needed at
all if a driver data structure is used along the code. Hence, add all
new needed stuff inside a new driver data structure. With this changes
driver can be properly compile tested.

Thanks in advance for reviewing this!

v1 of this series here [0].
v2 of this series here [1].
v3 of this series here [2].
v4 of this series here [3].
v5 of this series here [4].
v6 of this series here [5].

Changes in v7:
    - Restore phandler 'mediatek,sysctl' in bindings with Krzysztof's 'Acked-by'.
    - Use regmap syscon 'syscon_regmap_lookup_by_phandle()' and only if this
      fails use 'syscon_regmap_lookup_by_compatible()' to avoid DTB's ABI breakage.

Changes in v6:
    - Get regmap syscon using 'syscon_regmap_lookup_by_compatible()'
    - Add COMPILE_TEST and dependencies to Kconfig.
    - Collect Philippe Mathieu-Daudé 'Reviewed-by' tag for watchdog node
      warning fix.

Changes in v5:
    - Drop patches related with device tree ABI breakage and only
      maintain the rest.
    - Collect Arinc 'Reviewed-by' tag for watchdog node warning fix.

Changes in v4:
    - Add a patch to fix a watchdog node warning with 'make dtbs_check'
      because of a wrong node name.
    - Collect Guenter 'Reviewed-by' tags for watchdog driver code.
    - Add a missing 'COMPILE_TEST' to Kconfig which was lost when driver
      code was split in two patches in v2.

Changes in v3:
    - rename phandler from 'ralink,sysctl' into 'mediatek,sysctl'.
    - Drop error message added in PATCH 3 that modifies functionality
      and we only want to maintain current functionaloty by now.

Changes in v2:
    - Remove no needed compatible 'syscon' from bindings.
    - Rewrite new syscon phandle description in bindings.
    - Remove 'syscon' from compatible in 'mt7621.dtsi'.
    - Split PATCH 3 into two different patches:
        - PATCH 3: removes static globals using a driver data structure.
        - PATCH 4: remove ralink architecture dependent includes and code.

Best regards,
    Sergio Paracuellos

[0]: https://lore.kernel.org/linux-watchdog/[e-mail]/T/#t
[1]: https://lore.kernel.org/linux-watchdog/[e-mail]/T/#t
[2]: https://lore.kernel.org/linux-watchdog/[e-mail]/T/#t
[3]: https://lore.kernel.org/linux-watchdog/[e-mail]/T/#t
[4]: https://lore.kernel.org/linux-watchdog/[e-mail]/T/#t
[5]: https://lore.kernel.org/linux-watchdog/[e-mail]/T/#t

Sergio Paracuellos (5):
  dt-bindings: watchdog: mt7621-wdt: add phandle to access system
    controller registers
  mips: dts: ralink: mt7621: rename watchdog node from 'wdt' into
    'watchdog'
  mips: dts: ralink: mt7621: add phandle to system controller node for
    watchdog
  watchdog: mt7621-wdt: avoid static global declarations
  watchdog: mt7621-wdt: avoid ralink architecture dependent code

 .../watchdog/mediatek,mt7621-wdt.yaml         |   7 +
 arch/mips/boot/dts/ralink/mt7621.dtsi         |   3 +-
 drivers/watchdog/Kconfig                      |   4 +-
 drivers/watchdog/mt7621_wdt.c                 | 122 ++++++++++++------
 4 files changed, 93 insertions(+), 43 deletions(-)