Add clock mode selection knob for ESP32

See https://github.com/cesanta/esp-idf/blob/master/examples/ethernet/ethernet/README.md#phy-clock-wiring for details

CL: Add clock mode selection knob for ESP32

PUBLISHED_FROM=d93bb909ccdc1c1236f9cba01313577391c5b395

Author: Deomid Ryabkov

mos_esp32.yml

@@ -7,5 +7,6 @@ cdefs:
   # MGOS_ETH_PHY_TLK110: 1
 
 config_schema:
+  - ["eth.clk_mode", "i", 0, {title: "50 MHz clock source: 0 in <- GPIO0, 1 out -> GPIO0, 2 out -> GPIO16, 3 out -> GPIO17 (inverted)"}]
   - ["eth.mdc_gpio", "i", 23, {title: "GPIO to use for RMII MDC signal"}]
   - ["eth.mdio_gpio", "i", 18, {title: "GPIO to use for RMII MDIO signal"}]

src/esp32/esp32_eth.c

@@ -53,6 +53,7 @@ bool mgos_ethernet_init(void) {
 
   /* Set the PHY address in the example configuration */
   config.phy_addr = mgos_sys_config_get_eth_phy_addr();
+  config.clock_mode = mgos_sys_config_get_eth_clk_mode();
   config.gpio_config = eth_config_pins;
   config.tcpip_input = tcpip_adapter_eth_input;