esp32/network_lan: Add arg to constructor to set clock mode for ETH PHY.

This optional parameter for network.LAN clock_mode can be used for cases
where the clock source is different from the default GPIO0.  Fixes #4502.

ports/esp32/modnetwork.c

@@ -41,6 +41,7 @@
 #include "py/mphal.h"
 #include "py/mperrno.h"
 #include "netutils.h"
+#include "esp_eth.h"
 #include "esp_wifi.h"
 #include "esp_wifi_types.h"
 #include "esp_log.h"
@@ -697,6 +698,14 @@ STATIC const mp_rom_map_elem_t mp_module_network_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_PHY_LAN8720), MP_ROM_INT(PHY_LAN8720) },
     { MP_ROM_QSTR(MP_QSTR_PHY_TLK110), MP_ROM_INT(PHY_TLK110) },
 
+    // ETH Clock modes from ESP-IDF
+    { MP_ROM_QSTR(MP_QSTR_ETH_CLOCK_GPIO0_IN), MP_ROM_INT(ETH_CLOCK_GPIO0_IN) },
+    // Disabled at Aug 22nd 2018, reenabled Jan 28th 2019 in ESP-IDF
+    // Because we use older SDK, it's currently disabled
+    //{ MP_ROM_QSTR(MP_QSTR_ETH_CLOCK_GPIO0_OUT), MP_ROM_INT(ETH_CLOCK_GPIO0_OUT) },
+    { MP_ROM_QSTR(MP_QSTR_ETH_CLOCK_GPIO16_OUT), MP_ROM_INT(ETH_CLOCK_GPIO16_OUT) },
+    { MP_ROM_QSTR(MP_QSTR_ETH_CLOCK_GPIO17_OUT), MP_ROM_INT(ETH_CLOCK_GPIO17_OUT) },
+
     { MP_ROM_QSTR(MP_QSTR_STAT_IDLE), MP_ROM_INT(STAT_IDLE)},
     { MP_ROM_QSTR(MP_QSTR_STAT_CONNECTING), MP_ROM_INT(STAT_CONNECTING)},
     { MP_ROM_QSTR(MP_QSTR_STAT_GOT_IP), MP_ROM_INT(STAT_GOT_IP)},

ports/esp32/network_lan.c

@@ -94,7 +94,7 @@ STATIC mp_obj_t get_lan(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_ar
         return MP_OBJ_FROM_PTR(&lan_obj);
     }
 
-    enum { ARG_id, ARG_mdc, ARG_mdio, ARG_power, ARG_phy_addr, ARG_phy_type };
+    enum { ARG_id, ARG_mdc, ARG_mdio, ARG_power, ARG_phy_addr, ARG_phy_type, ARG_clock_mode };
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_id,           MP_ARG_OBJ, {.u_obj = mp_const_none} },
         { MP_QSTR_mdc,          MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_OBJ },
@@ -102,6 +102,7 @@ STATIC mp_obj_t get_lan(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_ar
         { MP_QSTR_power,        MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_OBJ },
         { MP_QSTR_phy_addr,     MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT },
         { MP_QSTR_phy_type,     MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT },
+        { MP_QSTR_clock_mode,   MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
     };
 
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
@@ -125,6 +126,15 @@ STATIC mp_obj_t get_lan(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_ar
         mp_raise_ValueError("invalid phy type");
     }
 
+    if (args[ARG_clock_mode].u_int != -1 &&
+        args[ARG_clock_mode].u_int != ETH_CLOCK_GPIO0_IN &&
+        // Disabled due ESP-IDF (see modnetwork.c note)
+        //args[ARG_clock_mode].u_int != ETH_CLOCK_GPIO0_OUT &&
+        args[ARG_clock_mode].u_int != ETH_CLOCK_GPIO16_OUT &&
+        args[ARG_clock_mode].u_int != ETH_CLOCK_GPIO17_OUT) {
+        mp_raise_ValueError("invalid clock mode");
+    }
+
     eth_config_t config;
 
     switch (args[ARG_phy_type].u_int) {
@@ -146,6 +156,10 @@ STATIC mp_obj_t get_lan(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_ar
     config.gpio_config = init_lan_rmii;
     config.tcpip_input = tcpip_adapter_eth_input;
 
+    if (args[ARG_clock_mode].u_int != -1) {
+        config.clock_mode = args[ARG_clock_mode].u_int;
+    }
+
     if (esp_eth_init(&config) == ESP_OK) {
         self->active = false;
         self->initialized = true;