[PATCH v2 0/8] watchdog: loongson1: Add Loongson-7A watchdog support

["Rong Zhang" <rongrong@oss.cipunited.com>]

The Loongson-7A has a watchdog compatible with the one on Loongson
2K0300. It uses an internal 50MHz clock source of the PCH, which is also
shared among other miscellaneous peripherals in the PCH.

Add a 50MHz fixed-clock node with label "pch_misc_clk" to represent the
miscellaneous clock, and migrate existing miscellaneous peripherals
(namely, ls7a_uart*) to use it rather than clock-frequency.

With that, add "loongson,ls7a-wdt" compatible to dt-bindings and the
corresponding watchdog node to ls7a-pch.dtsi. Afterward, enable
LOONGSON1_WDT in defconfig to make it work by default.

Tested on Loongson-LS3A4000-7A1000-NUC-SE and Lenovo KaiTian M530Z.

Since the series modifies ls7a-pch.dtsi here and there, it also fixes
the weird semi-dec-semi-hex style in ranges and reg properties and add
the missing #address-cells = <0> properties to interrupt-controller
nodes.

Signed-off-by: Rong Zhang <rongrong@oss.cipunited.com>
---
Changes in v2:
- Add a fixed-clock node to represent the clock source for miscellaneous
  peripherals instead of introducing a new clock-frequency node (thanks
  Guenter Roeck, Conor Dooley)
- With the above change, "loongson,ls7a-wdt" is now compatible with
  "loongson,ls2k0300-wdt" (ditto)
- Replace pre-existing clock-frequency nodes by utilizing the new
  fixed-clock node (thanks Conor Dooley)
  - Suppress warnings in lefi_fixup_fdt_serial() when the UART has a
    clocks node
- Fix weird semi-dec-semi-hex style addresses and ranges (ditto)
  - Also fix pre-existing ones, as their context (clock-frequency) is
    touched by the series due to the previous change
- Rephrase commit messages (ditto)
- Add missing #address-cells to interrupt controllers, as its absence
  causes a flood of warning when verifying my changes
- Link to v1: https://patch.msgid.link/20261110-mips-ls7a-wdt-v1-0-968bb85122e6@oss.cipunited.com

---
Rong Zhang (8):
      dt-bindings: watchdog: loongson,ls1x-wdt: Add compatible for Loongson-7A
      MIPS: Loongson64: env: Don't warn if UART has clocks node when fixing up FDT
      MIPS: Loongson64: dts: ls7a-pch: Add missing #address-cells to interrupt controllers
      MIPS: Loongson64: dts: ls7a-pch: Use hex in ranges and reg properties
      MIPS: Loongson64: dts: ls7a-pch: Add miscellaneous clock node
      MIPS: Loongson64: dts: ls7a-pch: Bind UART nodes to miscellaneous clock
      MIPS: Loongson64: dts: ls7a-pch: Add watchdog node
      MIPS: loongson3_defconfig: Enable LOONGSON1_WDT by default

 .../bindings/watchdog/loongson,ls1x-wdt.yaml       | 13 ++++--
 arch/mips/boot/dts/loongson/ls7a-pch.dtsi          | 50 ++++++++++++--------
 arch/mips/configs/loongson3_defconfig              | 54 ++++------------------
 arch/mips/loongson64/env.c                         |  6 +++
 4 files changed, 56 insertions(+), 67 deletions(-)
---
base-commit: 9d66f26fefacebfeed15de31c1123451a17ff119
change-id: 664fad58-mips-ls7a-wdt-1e614643b33d

Thanks,
Rong