drivers: ethernet: lan9250: add in the reset gpio configurate

The reset gpio field was in the config structure but was not coded
into the initialization path. So, add the appropriate code to handle
the gpio setup when it is defined in the device tree.

Signed-off-by: Charles Hardin <ckhardin@gmail.com>

Author: ckhardin

drivers/ethernet/eth_lan9250.c

@@ -691,6 +691,19 @@ static int lan9250_init(const struct device *dev)
 
 	gpio_pin_interrupt_configure_dt(&config->interrupt, GPIO_INT_EDGE_TO_ACTIVE);
 
+	if (config->reset.port) {
+		if (!gpio_is_ready_dt(&config->reset)) {
+			LOG_ERR("GPIO port %s not ready", config->reset.port->name);
+			return -EINVAL;
+		}
+		if (gpio_pin_configure_dt(&config->reset, GPIO_OUTPUT)) {
+			LOG_ERR("Unable to configure GPIO pin %u", config->reset.pin);
+			return -EINVAL;
+		}
+		gpio_pin_set_dt(&config->reset, 0);
+		k_usleep(500);
+	}
+
 	/* Reset and wait for ready on the LAN9250 SPI device */
 	ret = lan9250_sw_reset(dev);
 	if (ret < 0) {
@@ -727,6 +740,7 @@ static int lan9250_init(const struct device *dev)
 	static const struct lan9250_config lan9250_##inst##_config = {                             \
 		.spi = SPI_DT_SPEC_INST_GET(inst, SPI_WORD_SET(8)),                                \
 		.interrupt = GPIO_DT_SPEC_INST_GET(inst, int_gpios),                               \
+		.reset = GPIO_DT_SPEC_INST_GET_OR(inst, reset_gpios, {0}),                         \
 		.timeout = CONFIG_ETH_LAN9250_BUF_ALLOC_TIMEOUT,                                   \
 		.random_mac = DT_INST_PROP(inst, zephyr_random_mac_address),                       \
 	};                                                                                         \