fix(esp_eth): fixed ESP32P4 EMAC REF RMII CLK output mode

fixed units returned and used by periph_rtc_mpll_freq_set function

components/esp_eth/test_apps/main/Kconfig.projbuild

@@ -53,6 +53,20 @@ menu "esp_eth TEST_APPS Configuration"
                 default 18
         endif
 
+        config TARGET_RMII_CLK_OUT
+            bool "REF RMII CLK output"
+            default n
+
+        if TARGET_RMII_CLK_OUT
+            config TARGET_RMII_CLK_OUT_GPIO
+                int "REF RMII CLK Output GPIO"
+                default 23
+
+            config TARGET_RMII_CLK_IN_GPIO
+                int "REF RMII CLK Input GPIO"
+                default 32
+        endif # TARGET_RMII_CLK_OUT
+
     endif # TARGET_USE_INTERNAL_ETHERNET
 
     if TARGET_USE_SPI_ETHERNET

components/esp_eth/test_apps/main/esp_eth_test_common.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
@@ -39,6 +39,12 @@ esp_eth_mac_t *mac_init(void *vendor_emac_config, eth_mac_config_t *mac_config)
     esp32_emac_config.smi_gpio.mdc_num = CONFIG_TARGET_IO_MDC;
     esp32_emac_config.smi_gpio.mdio_num = CONFIG_TARGET_IO_MDIO;
 #endif // CONFIG_TARGET_USE_DEFAULT_EMAC_CONFIG
+#if CONFIG_TARGET_RMII_CLK_OUT
+    esp32_emac_config.clock_config.rmii.clock_mode = EMAC_CLK_OUT;
+    esp32_emac_config.clock_config.rmii.clock_gpio = CONFIG_TARGET_RMII_CLK_OUT_GPIO;
+    esp32_emac_config.clock_config_out_in.rmii.clock_mode = EMAC_CLK_EXT_IN;
+    esp32_emac_config.clock_config_out_in.rmii.clock_gpio = CONFIG_TARGET_RMII_CLK_IN_GPIO;
+#endif // CONFIG_TARGET_TEST_RMII_CLK_OUT
     if (vendor_emac_config == NULL) {
         vendor_emac_config = &esp32_emac_config;
     }

components/esp_eth/test_apps/main/esp_eth_test_esp_emac.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
@@ -564,3 +564,23 @@ TEST_CASE("internal emac erroneous frames", "[esp_emac]")
     vEventGroupDelete(eth_event_group);
     vSemaphoreDelete(mutex);
 }
+
+TEST_CASE("internal emac ref rmii clk out", "[esp_emac_clk_out]")
+{
+    esp_eth_mac_t *mac = mac_init(NULL, NULL);
+    TEST_ASSERT_NOT_NULL(mac);
+    esp_eth_phy_t *phy = phy_init(NULL);
+    TEST_ASSERT_NOT_NULL(phy);
+    esp_eth_config_t eth_config = ETH_DEFAULT_CONFIG(mac, phy);
+    esp_eth_handle_t eth_handle = NULL;
+    // install Ethernet driver
+    // This is a simple test and it only verifies the REF RMII output CLK is configured and started, and the internal
+    // EMAC is clocked by it. It does not verify the whole system functionality. As such, it can be executed on the same
+    // test boards which are configured to input REF RMII CLK by default with only minor HW modification.
+    TEST_ESP_OK(esp_eth_driver_install(&eth_config, &eth_handle));
+    extra_eth_config(eth_handle);
+    TEST_ESP_OK(esp_eth_driver_uninstall(eth_handle));
+    TEST_ESP_OK(phy->del(phy));
+    TEST_ESP_OK(mac->del(mac));
+    extra_cleanup();
+}

components/esp_eth/test_apps/pytest_esp_eth.py

@@ -315,6 +315,19 @@ def test_esp32p4_emac(dut: IdfDut) -> None:
     ethernet_heap_alloc_test(dut)
 
 
+@pytest.mark.eth_ip101
+@pytest.mark.parametrize(
+    'config',
+    [
+        'rmii_clko_esp32p4',
+    ],
+    indirect=True,
+)
+@idf_parametrize('target', ['esp32p4'], indirect=['target'])
+def test_esp32p4_emac_clko(dut: IdfDut) -> None:
+    dut.run_all_single_board_cases(group='esp_emac_clk_out')
+
+
 # ----------- LAN8720 -----------
 @pytest.mark.eth_lan8720
 @pytest.mark.parametrize(

components/esp_eth/test_apps/sdkconfig.ci.rmii_clko_esp32p4

@@ -0,0 +1,17 @@
+CONFIG_IDF_TARGET="esp32p4"
+
+CONFIG_UNITY_ENABLE_FIXTURE=y
+CONFIG_UNITY_ENABLE_IDF_TEST_RUNNER=y
+CONFIG_ETH_USE_ESP32_EMAC=y
+CONFIG_ESP_TASK_WDT_EN=n
+
+CONFIG_TARGET_USE_INTERNAL_ETHERNET=y
+CONFIG_TARGET_ETH_PHY_DEVICE_IP101=y
+
+CONFIG_TARGET_USE_DEFAULT_EMAC_CONFIG=y
+
+CONFIG_TARGET_RMII_CLK_OUT=y
+# Test board needs to be modified!
+# Connect GPIO23 to GPIO32 via wire.
+CONFIG_TARGET_RMII_CLK_OUT_GPIO=23
+CONFIG_TARGET_RMII_CLK_IN_GPIO=32