Merge remote-tracking branch 'upstream/bk72xx-wdt-feed-interval' into integration

esphome/core/application.h

@@ -219,11 +219,22 @@ class Application {
   /// loops and scheduler items still feed after every op, so any op exceeding
   /// this threshold triggers a real feed naturally.
   /// Safety margins vs. platform watchdog timeouts:
-  ///   - ESP32 task WDT default (5 s): ~16x
-  ///   - ESP8266 soft WDT (~1.6 s):    ~5x  <-- floor case; any future change
-  ///                                             must keep comfortable margin here
-  ///   - ESP8266 HW WDT (~6 s):        ~20x
+  ///   - ESP32 task WDT default (5 s):  ~16x
+  ///   - ESP8266 soft WDT (~1.6 s):     ~5x  <-- floor case; any future change
+  ///                                              must keep comfortable margin here
+  ///   - ESP8266 HW WDT (~6 s):         ~20x
+  ///   - BK72xx HW WDT (10 s):          ~5x  <-- platform override below
+#ifdef USE_BK72XX
+  /// BK72xx silicon requires a ~200 µs busy-wait between two watchdog register
+  /// key writes on every reload (sctrl_dpll_delay200us() in BDK wdt.c), making
+  /// each arch_feed_wdt() ~300 µs. LibreTiny initialises the HW WDT at 10 s,
+  /// so 2000 ms keeps a 5x safety margin — matching the ESP8266 ratio that
+  /// motivated the generic 300 ms value — while cutting feed frequency ~6x
+  /// and recovering ~50 ms/min of main-loop overhead on typical configs.
+  static constexpr uint32_t WDT_FEED_INTERVAL_MS = 2000;
+#else
   static constexpr uint32_t WDT_FEED_INTERVAL_MS = 300;
+#endif
 
   /// Feed the task watchdog. Cold entry — callers without a millis()
   /// timestamp in hand. Out of line to keep call sites tiny.