watchdog: ulp_wdog: Use driver model for reset_cpu()

Replace hardcoded WDOG_BASE_ADDR with driver model based dynamic address
lookup from device tree, allowing reset_cpu() to dynamically locate
watchdog devices from device tree.

This change also enables CONFIG_WDT for relevant boards and ensures the
watchdog nodes are available for driver model usage.

- Remove hardcoded WDOG_BASE_ADDR from hw_watchdog_* functions
- Reimplement reset_cpu() using UCLASS_WDT device iteration
- Add ulp_wdt_expire_now() callback for standard WDT interface
- Pass wdog register pointer to hw_watchdog_set_timeout()
- Enable CONFIG_WDT for boards using ULP watchdog
- Remove wdog3 status = "disabled" overrides from U-Boot device tree
  overlays, as the watchdog device needs to be accessible for driver
  model based reset functionality.

Signed-off-by: Alice Guo <[email protected]>
Acked-by: Francesco Dolcini <[email protected]> # Toradex boards
Reviewed-by: Peng Fan <[email protected]>

6 files changed, 0 insertions, 24 deletions

diff --git a/arch/arm/dts/imx8ulp-evk-u-boot.dtsi b/arch/arm/dts/imx8ulp-evk-u-boot.dtsi
index 860994129ae..ac130b54738 100644
--- a/arch/arm/dts/imx8ulp-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx8ulp-evk-u-boot.dtsi
@@ -26,10 +26,6 @@
 	status = "disabled";
 };
 
-&wdog3 {
-	status = "disabled";
-};
-
 &per_bridge4 {
 	bootph-pre-ram;
 };
diff --git a/arch/arm/dts/imx943-evk-u-boot.dtsi b/arch/arm/dts/imx943-evk-u-boot.dtsi
index 247a7ed6838..3b3619d2232 100644
--- a/arch/arm/dts/imx943-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx943-evk-u-boot.dtsi
@@ -153,10 +153,6 @@
 	bootph-pre-ram;
 };
 
-&wdog3 {
-	status = "disabled";
-};
-
 &xspi1 {
 	bootph-pre-ram;
 	pinctrl-names = "default";
diff --git a/arch/arm/dts/imx95-15x15-evk-u-boot.dtsi b/arch/arm/dts/imx95-15x15-evk-u-boot.dtsi
index 514dd729be9..34b4073ff35 100644
--- a/arch/arm/dts/imx95-15x15-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx95-15x15-evk-u-boot.dtsi
@@ -44,10 +44,6 @@
 	bootph-pre-ram;
 };
 
-&wdog3 {
-	status = "disabled";
-};
-
 &pinctrl_uart1 {
 	bootph-pre-ram;
 };
diff --git a/arch/arm/dts/imx95-19x19-evk-u-boot.dtsi b/arch/arm/dts/imx95-19x19-evk-u-boot.dtsi
index 8b59831b7ca..1083d863c4d 100644
--- a/arch/arm/dts/imx95-19x19-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx95-19x19-evk-u-boot.dtsi
@@ -28,10 +28,6 @@
 	bootph-pre-ram;
 };
 
-&wdog3 {
-	status = "disabled";
-};
-
 &pinctrl_uart1 {
 	bootph-pre-ram;
 };
diff --git a/arch/arm/dts/imx95-toradex-smarc-dev-u-boot.dtsi b/arch/arm/dts/imx95-toradex-smarc-dev-u-boot.dtsi
index 24952579a67..e4eda61e5c4 100644
--- a/arch/arm/dts/imx95-toradex-smarc-dev-u-boot.dtsi
+++ b/arch/arm/dts/imx95-toradex-smarc-dev-u-boot.dtsi
@@ -103,7 +103,3 @@
 &usdhc2 {
 	bootph-pre-ram;
 };
-
-&wdog3 {
-	status = "disabled";
-};
diff --git a/arch/arm/dts/imx95-verdin-wifi-dev-u-boot.dtsi b/arch/arm/dts/imx95-verdin-wifi-dev-u-boot.dtsi
index 45633765c0f..8ab70cf7399 100644
--- a/arch/arm/dts/imx95-verdin-wifi-dev-u-boot.dtsi
+++ b/arch/arm/dts/imx95-verdin-wifi-dev-u-boot.dtsi
@@ -105,7 +105,3 @@
 &usdhc1 {
 	bootph-pre-ram;
 };
-
-&wdog3 {
-	status = "disabled";
-};