[PATCH v1 6/8] net: macb: Add phy address to read it from device tree

[padmarao.begari at microchip.com]

From: Padmarao Begari <padmarao.begari at microchip.com>

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: Padmarao Begari <padmarao.begari at microchip.com>
---
 drivers/net/macb.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index e06d85d849..fda90f4e49 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -477,6 +477,12 @@ 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;
@@ -1254,6 +1260,8 @@ static int macb_eth_probe(struct udevice *dev)
 	struct macb_device *macb = dev_get_priv(dev);
 	const char *phy_mode;
 	int ret;
+	u32 phy_addr;
+	ofnode node;
 
 	phy_mode = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "phy-mode",
 			       NULL);
@@ -1264,6 +1272,13 @@ static int macb_eth_probe(struct udevice *dev)
 		return -EINVAL;
 	}
 
+	/* Look for a PHY node under the Ethernet node */
+	node = dev_read_subnode(dev, "ethernet-phy");
+	if (ofnode_valid(node)) {
+		ofnode_read_u32(node, "reg", &phy_addr);
+		macb->phy_addr = phy_addr;
+	}
+
 	macb->regs = (void *)pdata->iobase;
 
 	macb->is_big_endian = (cpu_to_be32(0x12345678) == 0x12345678);
-- 
2.17.1