arm: kirkwood: GoFlex Home: Use Ethernet PHY name and address from device tree

In DM Ethernet, the old "egiga0" name is no longer valid,
so replace these with Ethernet PHY names from device tree. Also, read
Ethernet PHY address from device tree.

Signed-off-by: Tony Dinh <mibodhi@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>

1 files changed, 45 insertions, 12 deletions

diff --git a/board/Seagate/goflexhome/goflexhome.c b/board/Seagate/goflexhome/goflexhome.c
index af8cab7bdc..52be64fb8c 100644
--- a/board/Seagate/goflexhome/goflexhome.c
+++ b/board/Seagate/goflexhome/goflexhome.c
@@ -1,5 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
+ * Copyright (C) 2021
+ * Tony Dinh <mibodhi@gmail.com>
+ * Suriyan Ramasami <suriyan.r@gmail.com>
+ *
  * Copyright (C) 2013 Suriyan Ramasami <suriyan.r@gmail.com>
  *
  * Based on dockstar.c originally written by
@@ -107,36 +111,65 @@ int board_init(void)
 	return 0;
 }
 
+static int fdt_get_phy_addr(const char *path)
+{
+	const void *fdt = gd->fdt_blob;
+	const u32 *reg;
+	const u32 *val;
+	int node, phandle, addr;
+
+	/* Find the node by its full path */
+	node = fdt_path_offset(fdt, path);
+	if (node >= 0) {
+		/* Look up phy-handle */
+		val = fdt_getprop(fdt, node, "phy-handle", NULL);
+		if (val) {
+			phandle = fdt32_to_cpu(*val);
+			if (!phandle)
+				return -1;
+			/* Follow it to its node */
+			node = fdt_node_offset_by_phandle(fdt, phandle);
+			if (node) {
+				/* Look up reg */
+				reg = fdt_getprop(fdt, node, "reg", NULL);
+				if (reg) {
+					addr = fdt32_to_cpu(*reg);
+					return addr;
+				}
+			}
+		}
+	}
+	return -1;
+}
+
 #ifdef CONFIG_RESET_PHY_R
 /* Configure and enable MV88E1116 PHY */
 void reset_phy(void)
 {
 	u16 reg;
-	u16 devadr;
-	char *name = "egiga0";
+	int phyaddr;
+	char *name = "ethernet-controller@72000";
+	char *eth0_path = "/ocp@f1000000/ethernet-controller@72000/ethernet0-port@0";
 
 	if (miiphy_set_current_dev(name))
 		return;
 
-	/* command to read PHY dev address */
-	if (miiphy_read(name, 0xEE, 0xEE, (u16 *)&devadr)) {
-		printf("Err..%s could not read PHY dev address\n",
-		       __func__);
+	phyaddr = fdt_get_phy_addr(eth0_path);
+	if (phyaddr < 0)
 		return;
-	}
 
 	/*
 	 * Enable RGMII delay on Tx and Rx for CPU port
 	 * Ref: sec 4.7.2 of chip datasheet
 	 */
-	miiphy_write(name, devadr, MV88E1116_PGADR_REG, 2);
-	miiphy_read(name, devadr, MV88E1116_MAC_CTRL_REG, &reg);
+	miiphy_write(name, phyaddr, MV88E1116_PGADR_REG, 2);
+	miiphy_read(name, phyaddr, MV88E1116_MAC_CTRL_REG, &reg);
 	reg |= (MV88E1116_RGMII_RXTM_CTRL | MV88E1116_RGMII_TXTM_CTRL);
-	miiphy_write(name, devadr, MV88E1116_MAC_CTRL_REG, reg);
-	miiphy_write(name, devadr, MV88E1116_PGADR_REG, 0);
+	miiphy_write(name, phyaddr, MV88E1116_MAC_CTRL_REG, reg);
+	miiphy_write(name, phyaddr, MV88E1116_PGADR_REG, 0);
 
 	/* reset the phy */
-	miiphy_reset(name, devadr);
+	miiphy_reset(name, phyaddr);
 
 	printf("88E1116 Initialized on %s\n", name);
 }