esp32h2: fix apb freq bug

components/esp_hw_support/port/esp32h2/rtc_clk.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -356,7 +356,7 @@ uint32_t rtc_clk_ahb_freq_get()
     rtc_cpu_freq_config_t cpu_config;
     uint32_t ahb_div = REG_GET_FIELD(SYSTEM_BUSCLK_CONF_REG, SYSTEM_AHB_DIV_NUM) + 1;
     rtc_clk_cpu_freq_get_config(&cpu_config) ;
-    return   cpu_config.freq_mhz / ahb_div;
+    return   cpu_config.freq_mhz * MHZ / ahb_div;
 }
 
 uint32_t rtc_clk_ahb_freq_set(uint32_t div)

components/esp_hw_support/port/esp32h2/rtc_clk_init.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -62,7 +62,7 @@ void rtc_clk_init(rtc_clk_config_t cfg)
     rtc_xtal_freq_t xtal_freq = cfg.xtal_freq;
     esp_rom_uart_tx_wait_idle(0);
     rtc_clk_xtal_freq_update(xtal_freq);
-    rtc_clk_apb_freq_update(rtc_clk_apb_freq_get() * MHZ);
+    rtc_clk_apb_freq_update(rtc_clk_apb_freq_get());
 
     /* Set CPU frequency */
     rtc_clk_cpu_freq_get_config(&old_config);

components/soc/esp32h2/include/soc/rtc.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -487,6 +487,11 @@ void rtc_clk_apb_freq_update(uint32_t apb_freq);
 uint32_t rtc_clk_apb_freq_get(void);
 
 void rtc_clk_cpu_freq_set(uint32_t source, uint32_t div);
+
+/**
+ * @brief Get the current stored AHB frequency.
+ * @return The AHB frequency value as last set via rtc_clk_ahb_freq_set(), in Hz.
+ */
 uint32_t rtc_clk_ahb_freq_get(void);