From 8c74734591b973e1b3e79b6048d95050dd4650ff Mon Sep 17 00:00:00 2001
From: gaoxu <gaoxu@espressif.com>
Date: Thu, 22 Jan 2026 16:38:02 +0800
Subject: [PATCH] feat(rng): basic rng support on esp32h4

---
 .../src/bootloader_random_esp32h4.c           | 40 +++++++++++++++++++
 .../esp32h4/include/soc/Kconfig.soc_caps.in   |  4 ++
 components/soc/esp32h4/include/soc/soc_caps.h |  1 +
 3 files changed, 45 insertions(+)
 create mode 100644 components/bootloader_support/src/bootloader_random_esp32h4.c

diff --git a/components/bootloader_support/src/bootloader_random_esp32h4.c b/components/bootloader_support/src/bootloader_random_esp32h4.c
new file mode 100644
index 00000000000..7ff1b309cf9
--- /dev/null
+++ b/components/bootloader_support/src/bootloader_random_esp32h4.c
@@ -0,0 +1,40 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
+
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include "sdkconfig.h"
+#include "bootloader_random.h"
+#include "soc/soc.h"
+#include "soc/rng_reg.h"
+#include "esp_rom_sys.h"
+
+
+
+void bootloader_random_enable(void)
+{
+    REG_SET_BIT(RNG_DATE_REG, RNG_CLK_EN);
+    REG_SET_BIT(RNG_CFG_REG, RNG_TIMER_EN);
+    REG_SET_FIELD(RNG_CFG_REG, RNG_RTC_TIMER_EN, 0x3);
+    REG_SET_BIT(RNG_CFG_REG, RNG_SAMPLE_ENABLE);
+
+
+    for (int i = 0; i < 10; i++) {
+        uint32_t random_sync = REG_READ(RNG_DATA_SYNC_REG);
+        uint32_t random_unsync = REG_READ(RNG_DATA_REG);
+        uint32_t rng_cfg = REG_READ(RNG_CFG_REG);
+        uint32_t sample_cnt = (rng_cfg >> RNG_SAMPLE_CNT_S) & 0xFF;
+        esp_rom_printf("  [%d] sync: 0x%08x, unsync: 0x%08x, sample_cnt: 0x%02x\r\n",
+                       i + 1, random_sync, random_unsync, sample_cnt);
+        esp_rom_delay_us(1000);
+    }
+}
+
+void bootloader_random_disable(void)
+{
+    REG_CLR_BIT(RNG_CFG_REG, RNG_SAMPLE_ENABLE);
+    REG_SET_FIELD(RNG_CFG_REG, RNG_RTC_TIMER_EN, 0x0);
+    REG_CLR_BIT(RNG_CFG_REG, RNG_TIMER_EN);
+    REG_CLR_BIT(RNG_DATE_REG, RNG_CLK_EN);
+}
diff --git a/components/soc/esp32h4/include/soc/Kconfig.soc_caps.in b/components/soc/esp32h4/include/soc/Kconfig.soc_caps.in
index 4ce6694398b..2208ead0946 100644
--- a/components/soc/esp32h4/include/soc/Kconfig.soc_caps.in
+++ b/components/soc/esp32h4/include/soc/Kconfig.soc_caps.in
@@ -123,6 +123,10 @@ config SOC_I2C_SUPPORTED
     bool
     default y
 
+config SOC_RNG_SUPPORTED
+    bool
+    default y
+
 config SOC_SYSTIMER_SUPPORTED
     bool
     default y
diff --git a/components/soc/esp32h4/include/soc/soc_caps.h b/components/soc/esp32h4/include/soc/soc_caps.h
index 4fd46b63e48..32dd2f8c0f1 100644
--- a/components/soc/esp32h4/include/soc/soc_caps.h
+++ b/components/soc/esp32h4/include/soc/soc_caps.h
@@ -64,6 +64,7 @@
 #define SOC_GPSPI_SUPPORTED             1
 #define SOC_LEDC_SUPPORTED              1
 #define SOC_I2C_SUPPORTED               1
+#define SOC_RNG_SUPPORTED               1
 #define SOC_SYSTIMER_SUPPORTED          1
 // #define SOC_SUPPORT_COEXISTENCE         1    // TODO: [ESP32H4] IDF-12251 IDF-12252 IDF-12253
 #define SOC_AES_SUPPORTED               1