feat(bod): Add bod support on esp32s31

components/soc/esp32s31/include/soc/Kconfig.soc_caps.in

@@ -163,6 +163,10 @@ config SOC_ECC_EXTENDED_MODES_SUPPORTED
     bool
     default y
 
+config SOC_BOD_SUPPORTED
+    bool
+    default y
+
 config SOC_PAU_SUPPORTED
     bool
     default y

components/soc/esp32s31/include/soc/regi2c_brownout.h

@@ -0,0 +1,22 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ */
+
+#pragma once
+
+/**
+ * @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            0x61
+#define I2C_BOD_HOSTID     0
+
+#define I2C_BOD_THRESHOLD           0x5
+#define I2C_BOD_THRESHOLD_MSB       2
+#define I2C_BOD_THRESHOLD_LSB       0

components/soc/esp32s31/include/soc/soc_caps.h

@@ -74,7 +74,7 @@
 #define SOC_ECC_EXTENDED_MODES_SUPPORTED   1
 // #define SOC_FLASH_ENC_SUPPORTED         1         // TODO: [ESP32S31] IDF-14628
 // #define SOC_SECURE_BOOT_SUPPORTED       1      // TODO: [ESP32S31] IDF-14629
-// #define SOC_BOD_SUPPORTED               1      // TODO: [ESP32S31] IDF-14658
+#define SOC_BOD_SUPPORTED               1
 // #define SOC_APM_SUPPORTED               1      // TODO: [ESP32S31] IDF-14620
 #define SOC_PAU_SUPPORTED                  1
 #define SOC_PMU_SUPPORTED                  1

components/soc/esp32s31/power_supply_periph.c

@@ -0,0 +1,11 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ */
+
+#include "soc/power_supply_periph.h"
+
+const power_supply_signal_conn_t power_supply_periph_signal = {
+    .irq = ETS_LP_ANAPERI_INTR_SOURCE,
+};

components/soc/esp32s31/register/soc/lp_analog_peri_struct.h

@@ -257,6 +257,7 @@ typedef struct {
     volatile lp_ana_date_reg_t date;
 } lp_ana_dev_t;
 
+extern lp_ana_dev_t LP_ANA_PERI;
 
 #ifndef __cplusplus
 _Static_assert(sizeof(lp_ana_dev_t) == 0x400, "Invalid size of lp_ana_dev_t structure");