esp32: compile PHY-related code only when WiFi is enabled

Fixes https://github.com/espressif/esp-idf/issues/230, https://github.com/espressif/esp-idf/issues/237

components/esp32/cpu_start.c

@@ -71,9 +71,11 @@ static bool app_cpu_started = false;
 #endif //!CONFIG_FREERTOS_UNICORE
 
 static void do_global_ctors(void);
-static void do_phy_init();
 static void main_task(void* args);
 extern void app_main(void);
+#if CONFIG_ESP32_PHY_AUTO_INIT
+static void do_phy_init();
+#endif
 
 extern int _bss_start;
 extern int _bss_end;
@@ -264,6 +266,7 @@ static void main_task(void* args)
     vTaskDelete(NULL);
 }
 
+#if CONFIG_ESP32_PHY_AUTO_INIT
 static void do_phy_init()
 {
     esp_phy_calibration_mode_t calibration_mode = PHY_RF_CAL_PARTIAL;
@@ -297,3 +300,5 @@ static void do_phy_init()
     esp_phy_release_init_data(init_data);
     free(cal_data); // PHY maintains a copy of calibration data, so we can free this
 }
+#endif //CONFIG_ESP32_PHY_AUTO_INIT
+

components/esp32/phy_init.c

@@ -23,10 +23,12 @@
 #include "esp_err.h"
 #include "esp_phy_init.h"
 #include "esp_system.h"
-#include "phy.h"
 #include "esp_log.h"
 #include "nvs.h"
 #include "sdkconfig.h"
+
+#ifdef CONFIG_WIFI_ENABLED
+#include "phy.h"
 #include "phy_init_data.h"
 
 static const char* TAG = "phy_init";
@@ -219,6 +221,4 @@ static esp_err_t store_cal_data_to_nvs_handle(nvs_handle handle,
     return err;
 }
 
-void register_chipv7_phy_stub()
-{
-}
+#endif // CONFIG_WIFI_ENABLED