net: ravb: Support reset GPIO both in mac and phy node

The recent DTs have the PHY reset GPIO in the PHY node rather than
the ethernet MAC node, support extracting the PHY reset GPIO info
from both the PHY node and ethernet MAC node.
Signed-off-by: NMarek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Cc: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/ravb.c

@@ -466,6 +466,7 @@ static int ravb_probe(struct udevice *dev)
 {
 	struct eth_pdata *pdata = dev_get_platdata(dev);
 	struct ravb_priv *eth = dev_get_priv(dev);
+	struct ofnode_phandle_args phandle_args;
 	struct mii_dev *mdiodev;
 	void __iomem *iobase;
 	int ret;
@@ -477,8 +478,16 @@ static int ravb_probe(struct udevice *dev)
 	if (ret < 0)
 		goto err_mdio_alloc;
 
-	gpio_request_by_name(dev, "reset-gpios", 0, &eth->reset_gpio,
-			     GPIOD_IS_OUT);
+	ret = dev_read_phandle_with_args(dev, "phy-handle", NULL, 0, 0, &phandle_args);
+	if (!ret) {
+		gpio_request_by_name_nodev(phandle_args.node, "reset-gpios", 0,
+					   &eth->reset_gpio, GPIOD_IS_OUT);
+	}
+
+	if (!dm_gpio_is_valid(&eth->reset_gpio)) {
+		gpio_request_by_name(dev, "reset-gpios", 0, &eth->reset_gpio,
+				     GPIOD_IS_OUT);
+	}
 
 	mdiodev = mdio_alloc();
 	if (!mdiodev) {