net: macb: Add phy address to read it from device tree

Read phy address from device tree and use it to find the phy device
if not found then search in the range of 0 to 31.
Signed-off-by: NPadmarao Begari <padmarao.begari@microchip.com>
Reviewed-by: NAnup Patel <anup.patel@wdc.com>
Reviewed-by: NBin Meng <bin.meng@windriver.com>
Tested-by: NBin Meng <bin.meng@windriver.com>

drivers/net/macb.c

@@ -531,6 +531,12 @@ static int macb_phy_find(struct macb_device *macb, const char *name)
 	int i;
 	u16 phy_id;
 
+	phy_id = macb_mdio_read(macb, macb->phy_addr, MII_PHYSID1);
+	if (phy_id != 0xffff) {
+		printf("%s: PHY present at %d\n", name, macb->phy_addr);
+		return 0;
+	}
+
 	/* Search for PHY... */
 	for (i = 0; i < 32; i++) {
 		macb->phy_addr = i;
@@ -1311,6 +1317,7 @@ static int macb_eth_probe(struct udevice *dev)
 {
 	struct eth_pdata *pdata = dev_get_plat(dev);
 	struct macb_device *macb = dev_get_priv(dev);
+	struct ofnode_phandle_args phandle_args;
 	const char *phy_mode;
 	int ret;
 
@@ -1323,6 +1330,12 @@ static int macb_eth_probe(struct udevice *dev)
 		return -EINVAL;
 	}
 
+	/* Read phyaddr from DT */
+	if (!dev_read_phandle_with_args(dev, "phy-handle", NULL, 0, 0,
+					&phandle_args))
+		macb->phy_addr = ofnode_read_u32_default(phandle_args.node,
+							 "reg", -1);
+
 	macb->regs = (void *)pdata->iobase;
 
 	macb->is_big_endian = (cpu_to_be32(0x12345678) == 0x12345678);