[RESEND PATCH 2/3] Marvell Sheevaplug: Use Ethernet PHY name and address from device tree

[Tony Dinh <mibodhi@gmail.com>]

- In DM Ethernet, the old "egiga0" name is no longer valid, so replace it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

Signed-off-by: Tony Dinh <mibodhi@gmail.com>
---

 board/Marvell/sheevaplug/sheevaplug.c | 54 +++++++++++++++++++++------
 1 file changed, 42 insertions(+), 12 deletions(-)

diff --git a/board/Marvell/sheevaplug/sheevaplug.c b/board/Marvell/sheevaplug/sheevaplug.c
index 0cc7f2b392..5952d158b2 100644
--- a/board/Marvell/sheevaplug/sheevaplug.c
+++ b/board/Marvell/sheevaplug/sheevaplug.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
+ * Copyright (C) 2021  Tony Dinh <mibodhi@gmail.com>
  * (C) Copyright 2009
  * Marvell Semiconductor <www.marvell.com>
  * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
@@ -100,36 +101,65 @@ 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",
-			__FUNCTION__);
+	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);
 }
-- 
2.20.1