The IWDG1 can be used to monitor the Cortex-A7's activity on stm32mp13x
SoCs. Add the IWDG1 node in the stm32mp131.dtsi SoC device tree file
in case this peripheral is configured as non-secure and managed by the
Linux kernel.

Add the arm_wdt node in the stm32mp131.dtsi SoC device tree file in
case the ARM SMC watchdog driver is necessary to interact with the
platform watchdog (e.g: the IWDG1 is configured as secure).

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
---
Changes in v2:
- Moved the IWDG1 under the ETZPC as is it securable. It should be
  managed by the ETZPC bus.
- Link to v1: https://lore.kernel.org/r/20250918-iwdg1-v1-0-02c2543c01a5@foss.st.com (local)

---
Gatien Chevallier (4):
      ARM: dts: stm32: add iwdg1 node in stm32mp131.dtsi
      ARM: dts: stm32: add the ARM SMC watchdog in stm32mp131.dtsi
      ARM: dts: stm32: enable the ARM SMC watchdog node in stm32mp135f-dk
      ARM: dts: stm32: add the IWDG2 interrupt line in stm32mp131.dtsi

 arch/arm/boot/dts/st/stm32mp131.dtsi    | 17 +++++++++++++++++
 arch/arm/boot/dts/st/stm32mp135f-dk.dts |  5 +++++
 2 files changed, 22 insertions(+)
---
base-commit: 53c18dc078bb6d9e9dfe2cc0671ab78588c44723
change-id: 20250918-iwdg1-0f7ea155135e

Best regards,
-- 
Gatien Chevallier [off-list ref]