fix(esp_hal_wdt): reduce IRAM usage of WDT init ROM patch

The ROM patch for chips missing clock source configuration in wdt_hal_init
was re-implementing the full function in IRAM. Instead, delegate to the ROM
version and only append the missing clock configuration afterwards, saving
~550 bytes of IRAM.

components/esp_hal_wdt/esp32c6/rom.wdt.ld

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2026 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -9,10 +9,9 @@
 
 /* Functions */
 
-/* Patch init function to set clock source
-wdt_hal_init = 0x40000394;
-wdt_hal_deinit = 0x40000398;
-*/
+/* Patch init/deinit to add clock configuration missing from ROM version */
+rom_wdt_hal_init = 0x40000394;
+rom_wdt_hal_deinit = 0x40000398;
 
 wdt_hal_config_stage = 0x4000039c;
 wdt_hal_write_protect_disable = 0x400003a0;

components/esp_hal_wdt/esp32h2/rom.wdt.ld

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2026 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -9,10 +9,9 @@
 
 /* Functions */
 
-/* Patch init function to set clock source
-wdt_hal_init = 0x4000038c;
-wdt_hal_deinit = 0x40000390;
-*/
+/* Patch init/deinit to add clock configuration missing from ROM version */
+rom_wdt_hal_init = 0x4000038c;
+rom_wdt_hal_deinit = 0x40000390;
 
 /* Functions */
 wdt_hal_config_stage = 0x40000394;

components/esp_hal_wdt/esp32h21/rom.wdt.ld

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2024-2026 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -10,10 +10,9 @@
 
 /* Functions */
 
-/* Patch init function to set clock source
-wdt_hal_init = 0x4000038c;
-wdt_hal_deinit = 0x40000390;
-*/
+/* Patch init/deinit to add clock configuration missing from ROM version */
+rom_wdt_hal_init = 0x4000038c;
+rom_wdt_hal_deinit = 0x40000390;
 
 /* Functions */
 wdt_hal_config_stage = 0x40000394;

components/esp_hal_wdt/rom_patch.c

@@ -14,107 +14,31 @@
 #include "hal/wdt_hal.h"
 
 #if ESP_ROM_WDT_INIT_PATCH
+extern void rom_wdt_hal_init(wdt_hal_context_t *hal, wdt_inst_t wdt_inst, uint32_t prescaler, bool enable_intr);
+extern void rom_wdt_hal_deinit(wdt_hal_context_t *hal);
+
 void wdt_hal_init(wdt_hal_context_t *hal, wdt_inst_t wdt_inst, uint32_t prescaler, bool enable_intr)
 {
-    //Initialize HAL context
-    memset(hal, 0, sizeof(wdt_hal_context_t));
-    if (wdt_inst == WDT_MWDT0) {
-        hal->mwdt_dev = &TIMERG0;
-    }
-#if TIMG_LL_GET(INST_NUM) >= 2
-    else if (wdt_inst == WDT_MWDT1) {
-        hal->mwdt_dev = &TIMERG1;
-    }
-#endif
-    else {
-        hal->rwdt_dev = RWDT_DEV_GET();
-    }
-    hal->inst = wdt_inst;
+    // ROM version omits clock source config for MWDT — delegate to ROM then fix up
+    rom_wdt_hal_init(hal, wdt_inst, prescaler, enable_intr);
 
-    if (hal->inst == WDT_RWDT) {
-        //Unlock RTC WDT
-        rwdt_ll_write_protect_disable(hal->rwdt_dev);
-        //Disable RTC WDT, all stages, and all interrupts.
-        rwdt_ll_disable(hal->rwdt_dev);
-        rwdt_ll_disable_stage(hal->rwdt_dev, WDT_STAGE0);
-        rwdt_ll_disable_stage(hal->rwdt_dev, WDT_STAGE1);
-        rwdt_ll_disable_stage(hal->rwdt_dev, WDT_STAGE2);
-        rwdt_ll_disable_stage(hal->rwdt_dev, WDT_STAGE3);
-#if SOC_IS(ESP32)
-        //Enable or disable level interrupt. Edge interrupt is always disabled.
-        rwdt_ll_set_edge_intr(hal->rwdt_dev, false);
-        rwdt_ll_set_level_intr(hal->rwdt_dev, enable_intr);
-#else
-        //Enable or disable chip reset on timeout, and length of chip reset signal
-        rwdt_ll_set_chip_reset_width(hal->rwdt_dev, 0);
-        rwdt_ll_set_chip_reset_en(hal->rwdt_dev, false);
-#endif
-        rwdt_ll_clear_intr_status(hal->rwdt_dev);
-        rwdt_ll_set_intr_enable(hal->rwdt_dev, enable_intr);
-        //Set default values
-#if SOC_CPU_CORES_NUM > 1
-        rwdt_ll_set_appcpu_reset_en(hal->rwdt_dev, true);
-#endif
-        rwdt_ll_set_procpu_reset_en(hal->rwdt_dev, true);
-        rwdt_ll_set_pause_in_sleep_en(hal->rwdt_dev, true);
-        rwdt_ll_set_cpu_reset_length(hal->rwdt_dev, WDT_RESET_SIG_LENGTH_3_2us);
-        rwdt_ll_set_sys_reset_length(hal->rwdt_dev, WDT_RESET_SIG_LENGTH_3_2us);
-        //Lock RTC WDT
-        rwdt_ll_write_protect_enable(hal->rwdt_dev);
-    } else {
-        //Unlock WDT
+    if (hal->inst != WDT_RWDT) {
         mwdt_ll_write_protect_disable(hal->mwdt_dev);
-        //Disable WDT and stages.
-        mwdt_ll_disable(hal->mwdt_dev);
-        mwdt_ll_disable_stage(hal->mwdt_dev, 0);
-        mwdt_ll_disable_stage(hal->mwdt_dev, 1);
-        mwdt_ll_disable_stage(hal->mwdt_dev, 2);
-        mwdt_ll_disable_stage(hal->mwdt_dev, 3);
-#if SOC_IS(ESP32) || SOC_IS(ESP32S2) || SOC_IS(ESP32S3)
-        //Enable or disable level interrupt. Edge interrupt is always disabled.
-        mwdt_ll_set_edge_intr(hal->mwdt_dev, false);
-        mwdt_ll_set_level_intr(hal->mwdt_dev, enable_intr);
-#endif
-        mwdt_ll_clear_intr_status(hal->mwdt_dev);
-        mwdt_ll_set_intr_enable(hal->mwdt_dev, enable_intr);
-        //Set default values
-        mwdt_ll_set_cpu_reset_length(hal->mwdt_dev, WDT_RESET_SIG_LENGTH_3_2us);
-        mwdt_ll_set_sys_reset_length(hal->mwdt_dev, WDT_RESET_SIG_LENGTH_3_2us);
         mwdt_ll_set_clock_source(hal->mwdt_dev, MWDT_CLK_SRC_DEFAULT);
         mwdt_ll_enable_clock(hal->mwdt_dev, true);
-        //Set tick period
-        mwdt_ll_set_prescaler(hal->mwdt_dev, prescaler);
-        //Lock WDT
         mwdt_ll_write_protect_enable(hal->mwdt_dev);
     }
 }
 
 void wdt_hal_deinit(wdt_hal_context_t *hal)
 {
-    if (hal->inst == WDT_RWDT) {
-        //Unlock WDT
-        rwdt_ll_write_protect_disable(hal->rwdt_dev);
-        //Disable WDT and clear any interrupts
-        rwdt_ll_feed(hal->rwdt_dev);
-        rwdt_ll_disable(hal->rwdt_dev);
-        rwdt_ll_clear_intr_status(hal->rwdt_dev);
-        rwdt_ll_set_intr_enable(hal->rwdt_dev, false);
-        //Lock WDT
-        rwdt_ll_write_protect_enable(hal->rwdt_dev);
-    } else {
-        //Unlock WDT
+    // ROM version omits mwdt_ll_enable_clock(false) — delegate to ROM then fix up
+    if (hal->inst != WDT_RWDT) {
         mwdt_ll_write_protect_disable(hal->mwdt_dev);
-        //Disable WDT and clear/disable any interrupts
-        mwdt_ll_feed(hal->mwdt_dev);
-        mwdt_ll_disable(hal->mwdt_dev);
-        mwdt_ll_clear_intr_status(hal->mwdt_dev);
-        mwdt_ll_set_intr_enable(hal->mwdt_dev, false);
         mwdt_ll_enable_clock(hal->mwdt_dev, false);
-        //Lock WDT
         mwdt_ll_write_protect_enable(hal->mwdt_dev);
     }
-    //Deinit HAL context
-    hal->mwdt_dev = NULL;
+    rom_wdt_hal_deinit(hal);
 }
 
 #if SOC_IS(ESP32P4) && (HAL_CONFIG(CHIP_SUPPORT_MIN_REV) <= 301)