feat(bod): Add support for bod on esp32h21

components/soc/esp32h21/include/soc/Kconfig.soc_caps.in

@@ -111,6 +111,10 @@ config SOC_SECURE_BOOT_SUPPORTED
     bool
     default y
 
+config SOC_BOD_SUPPORTED
+    bool
+    default y
+
 config SOC_PMU_SUPPORTED
     bool
     default y

components/soc/esp32h21/include/soc/regi2c_brownout.h

@@ -0,0 +1,24 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ */
+
+#pragma once
+
+#include "regi2c_pmu.h"
+
+/**
+ * @file regi2c_brownout.h
+ * @brief Register definitions for brownout detector
+ *
+ * This file lists register fields of the brownout detector, located on an internal configuration
+ * bus. These definitions are used via macros defined in regi2c_ctrl.h.
+ */
+
+#define I2C_BOD            I2C_PMU
+#define I2C_BOD_HOSTID     I2C_PMU_HOSTID
+
+#define I2C_BOD_THRESHOLD           0xD
+#define I2C_BOD_THRESHOLD_MSB       6
+#define I2C_BOD_THRESHOLD_LSB       3

components/soc/esp32h21/include/soc/soc_caps.h

@@ -58,7 +58,7 @@
 #define SOC_ECDSA_SUPPORTED             1
 #define SOC_FLASH_ENC_SUPPORTED         1
 #define SOC_SECURE_BOOT_SUPPORTED       1
-// #define SOC_BOD_SUPPORTED               1    //TODO: [ESP32H21] IDF-11530
+#define SOC_BOD_SUPPORTED               1
 // #define SOC_APM_SUPPORTED               1    //TODO: [ESP32H21] IDF-11494
 #define SOC_PMU_SUPPORTED               1
 #define SOC_RTC_TIMER_SUPPORTED         1