[PATCH v8 3/7] net: macb: Add phy address to read it from device tree

[Padmarao Begari <padmarao.begari@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@microchip.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Tested-by: Bin Meng <bin.meng@windriver.com>
---
 drivers/net/macb.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 0c2ac811fb..2225b33ff6 100644
--- a/drivers/net/macb.c
+++ b/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);
-- 
2.17.1