Restrict wake_loop_any_context to ESP32 only

LibreTiny lacks IRAM_ATTR support needed for ISR-safe paths,
and BK72xx doesn't support the mrs ipsr instruction in Thumb mode.
The existing fast select functionality on LibreTiny is unaffected.

esphome/core/application.h

@@ -510,10 +510,12 @@ class Application {
     esphome_lwip_wake_main_loop_from_isr(px_higher_priority_task_woken);
   }
 
+#ifdef USE_ESP32
   /// Wake the main event loop from any context (ISR, thread, or main loop).
   /// Detects the calling context and uses the appropriate FreeRTOS API.
   static void IRAM_ATTR wake_loop_any_context() { esphome_lwip_wake_main_loop_any_context(); }
 #endif
+#endif
 #endif
 
  protected:

esphome/core/component.cpp

@@ -315,7 +315,7 @@ void IRAM_ATTR HOT Component::enable_loop_soon_any_context() {
   // This method is thread and ISR-safe because:
   // 1. Only performs simple assignments to volatile variables (atomic on all platforms)
   // 2. No read-modify-write operations that could be interrupted
-  // 3. No memory allocation or object construction; the only call (wake_loop_any_context) is ISR-safe
+  // 3. No memory allocation or object construction; on ESP32 the only call (wake_loop_any_context) is ISR-safe
   // 4. IRAM_ATTR ensures code is in IRAM, not flash (required for ISR execution)
   // 5. Components are never destroyed, so no use-after-free concerns
   // 6. App is guaranteed to be initialized before any ISR could fire
@@ -323,12 +323,10 @@ void IRAM_ATTR HOT Component::enable_loop_soon_any_context() {
   // 8. Race condition with main loop is handled by clearing flag before processing
   this->pending_enable_loop_ = true;
   App.has_pending_enable_loop_requests_ = true;
-#ifdef USE_LWIP_FAST_SELECT
+#if defined(USE_LWIP_FAST_SELECT) && defined(USE_ESP32)
   // Wake the main loop if sleeping in ulTaskNotifyTake(). Without this,
   // the main loop would not wake until the select timeout expires (~16ms).
-  // Uses platform-specific context detection to choose the correct notify
-  // API (task vs ISR), e.g. xPortInIsrContext() on ESP32 or IPSR register
-  // on LibreTiny — safe from any calling context.
+  // Uses xPortInIsrContext() to choose the correct FreeRTOS notify API.
   Application::wake_loop_any_context();
 #endif
 }

esphome/core/lwip_fast_select.c

@@ -239,38 +239,18 @@ void IRAM_ATTR esphome_lwip_wake_main_loop_from_isr(int *px_higher_priority_task
 }
 
 // Wake the main loop from any context (ISR, thread, or main loop).
-// Detects ISR context and delegates to the appropriate variant:
-//   ESP32 (Xtensa/RISC-V): xPortInIsrContext() — checks interrupt nesting counter
-//   LibreTiny (ARM Cortex-M): IPSR register read via inline asm (0 = task context)
-#ifdef USE_LIBRETINY
-// Read the ARM Cortex-M IPSR register directly via inline asm.
-// Avoids depending on CMSIS __get_IPSR() which may not be declared/available
-// in all LibreTiny chip family toolchains (e.g. beken-72xx).
-static inline IRAM_ATTR uint32_t esphome_get_ipsr(void) {
-  uint32_t ipsr = 0;
-  __asm volatile("mrs %0, ipsr" : "=r"(ipsr));
-  return ipsr;
-}
-#endif
-
-void IRAM_ATTR esphome_lwip_wake_main_loop_any_context(void) {
+// ESP32-only: uses xPortInIsrContext() to detect ISR context.
+// LibreTiny is excluded because it lacks IRAM_ATTR support needed for ISR-safe paths.
 #ifdef USE_ESP32
+void IRAM_ATTR esphome_lwip_wake_main_loop_any_context(void) {
   if (xPortInIsrContext()) {
-#else
-  if (esphome_get_ipsr() != 0) {
-#endif
     int px_higher_priority_task_woken = 0;
     esphome_lwip_wake_main_loop_from_isr(&px_higher_priority_task_woken);
-#ifdef USE_ESP32
-    // On ESP32, explicitly request context switch if a higher-priority task was woken.
-    // On LibreTiny (ARM Cortex-M), portYIELD_FROM_ISR is not available — FreeRTOS
-    // sets the PendSV bit internally when needed, so the switch happens automatically
-    // when the ISR returns.
     portYIELD_FROM_ISR(px_higher_priority_task_woken);
-#endif
   } else {
     esphome_lwip_wake_main_loop();
   }
 }
+#endif
 
 #endif  // USE_LWIP_FAST_SELECT

esphome/core/lwip_fast_select.h

@@ -34,8 +34,11 @@ void esphome_lwip_wake_main_loop(void);
 void esphome_lwip_wake_main_loop_from_isr(int *px_higher_priority_task_woken);
 
 /// Wake the main loop task from any context (ISR, thread, or main loop).
-/// Detects the calling context and uses the appropriate FreeRTOS API.
+/// ESP32-only: uses xPortInIsrContext() to detect ISR context.
+/// LibreTiny lacks IRAM_ATTR support needed for ISR-safe paths.
+#ifdef USE_ESP32
 void esphome_lwip_wake_main_loop_any_context(void);
+#endif
 
 #ifdef __cplusplus
 }