diff --git a/components/esp_eth/include/esp_eth.h b/components/esp_eth/include/esp_eth.h
index 480349d56d..d204b50898 100644
--- a/components/esp_eth/include/esp_eth.h
+++ b/components/esp_eth/include/esp_eth.h
@@ -86,6 +86,47 @@ typedef struct {
     */
     esp_err_t (*on_lowlevel_deinit_done)(esp_eth_handle_t eth_handle);
 
+    /**
+    * @brief Read PHY register
+    *
+    * @note Usually the PHY register read/write function is provided by MAC (SMI interface),
+    *       but if the PHY device is managed by other interface (e.g. I2C), then user needs to
+    *       implement the corresponding read/write.
+    *       Setting this to NULL means your PHY device is managed by MAC's SMI interface.
+    *
+    * @param[in] eth_handle: handle of Ethernet driver
+    * @param[in] phy_addr: PHY chip address (0~31)
+    * @param[in] phy_reg: PHY register index code
+    * @param[out] reg_value: PHY register value
+    *
+    * @return
+    *      - ESP_OK: read PHY register successfully
+    *      - ESP_ERR_INVALID_ARG: read PHY register failed because of invalid argument
+    *      - ESP_ERR_TIMEOUT: read PHY register failed because of timeout
+    *      - ESP_FAIL: read PHY register failed because some other error occurred
+    */
+    esp_err_t (*read_phy_reg)(esp_eth_handle_t eth_handle, uint32_t phy_addr, uint32_t phy_reg, uint32_t *reg_value);
+
+    /**
+    * @brief Write PHY register
+    *
+    * @note Usually the PHY register read/write function is provided by MAC (SMI interface),
+    *       but if the PHY device is managed by other interface (e.g. I2C), then user needs to
+    *       implement the corresponding read/write.
+    *       Setting this to NULL means your PHY device is managed by MAC's SMI interface.
+    *
+    * @param[in] eth_handle: handle of Ethernet driver
+    * @param[in] phy_addr: PHY chip address (0~31)
+    * @param[in] phy_reg: PHY register index code
+    * @param[in] reg_value: PHY register value
+    *
+    * @return
+    *      - ESP_OK: write PHY register successfully
+    *      - ESP_ERR_INVALID_ARG: read PHY register failed because of invalid argument
+    *      - ESP_ERR_TIMEOUT: write PHY register failed because of timeout
+    *      - ESP_FAIL: write PHY register failed because some other error occurred
+    */
+    esp_err_t (*write_phy_reg)(esp_eth_handle_t eth_handle, uint32_t phy_addr, uint32_t phy_reg, uint32_t reg_value);
 } esp_eth_config_t;
 
 /**
@@ -100,6 +141,8 @@ typedef struct {
         .stack_input = NULL,             \
         .on_lowlevel_init_done = NULL,   \
         .on_lowlevel_deinit_done = NULL, \
+        .read_phy_reg = NULL,            \
+        .write_phy_reg = NULL,           \
     }
 
 /**
diff --git a/components/esp_eth/src/esp_eth.c b/components/esp_eth/src/esp_eth.c
index 52d07c741c..6f9a65b28f 100644
--- a/components/esp_eth/src/esp_eth.c
+++ b/components/esp_eth/src/esp_eth.c
@@ -55,6 +55,8 @@ typedef struct {
     esp_err_t (*stack_input)(esp_eth_handle_t eth_handle, uint8_t *buffer, uint32_t length, void *priv);
     esp_err_t (*on_lowlevel_init_done)(esp_eth_handle_t eth_handle);
     esp_err_t (*on_lowlevel_deinit_done)(esp_eth_handle_t eth_handle);
+    esp_err_t (*customized_read_phy_reg)(esp_eth_handle_t eth_handle, uint32_t phy_addr, uint32_t phy_reg, uint32_t *reg_value);
+    esp_err_t (*customized_write_phy_reg)(esp_eth_handle_t eth_handle, uint32_t phy_addr, uint32_t phy_reg, uint32_t reg_value);
 } esp_eth_driver_t;
 
 ////////////////////////////////Mediator Functions////////////////////////////////////////////
@@ -69,6 +71,11 @@ typedef struct {
 static esp_err_t eth_phy_reg_read(esp_eth_mediator_t *eth, uint32_t phy_addr, uint32_t phy_reg, uint32_t *reg_value)
 {
     esp_eth_driver_t *eth_driver = __containerof(eth, esp_eth_driver_t, mediator);
+    // invoking user customized PHY IO function if necessary
+    if (eth_driver->customized_read_phy_reg) {
+        return eth_driver->customized_read_phy_reg(eth_driver, phy_addr, phy_reg, reg_value);
+    }
+    // by default, PHY device is managed by MAC's SMI interface
     esp_eth_mac_t *mac = eth_driver->mac;
     return mac->read_phy_reg(mac, phy_addr, phy_reg, reg_value);
 }
@@ -76,6 +83,11 @@ static esp_err_t eth_phy_reg_read(esp_eth_mediator_t *eth, uint32_t phy_addr, ui
 static esp_err_t eth_phy_reg_write(esp_eth_mediator_t *eth, uint32_t phy_addr, uint32_t phy_reg, uint32_t reg_value)
 {
     esp_eth_driver_t *eth_driver = __containerof(eth, esp_eth_driver_t, mediator);
+    // invoking user customized PHY IO function if necessary
+    if (eth_driver->customized_write_phy_reg) {
+        return eth_driver->customized_write_phy_reg(eth_driver, phy_addr, phy_reg, reg_value);
+    }
+    // by default, PHY device is managed by MAC's SMI interface
     esp_eth_mac_t *mac = eth_driver->mac;
     return mac->write_phy_reg(mac, phy_addr, phy_reg, reg_value);
 }
@@ -184,6 +196,8 @@ esp_err_t esp_eth_driver_install(const esp_eth_config_t *config, esp_eth_handle_
     eth_driver->stack_input = config->stack_input;
     eth_driver->on_lowlevel_init_done = config->on_lowlevel_init_done;
     eth_driver->on_lowlevel_deinit_done = config->on_lowlevel_deinit_done;
+    eth_driver->customized_read_phy_reg = config->read_phy_reg;
+    eth_driver->customized_write_phy_reg = config->write_phy_reg;
     eth_driver->mediator.phy_reg_read = eth_phy_reg_read;
     eth_driver->mediator.phy_reg_write = eth_phy_reg_write;
     eth_driver->mediator.stack_input = eth_stack_input;