[PATCH v3 3/4] NSA310S : Use Ethernet PHY name from device tree

[Tony Dinh]

In DM Ethernet, the old "egiga0" name is no longer valid, so replace it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 <mibo...@gmail.com>
---

Changes in v3:
- Get eth0 PHY address from device tree

Changes in v2:
- Correct copyright

 board/zyxel/nsa310s/nsa310s.c | 47 +++++++++++++++++++++++++++++------
 1 file changed, 39 insertions(+), 8 deletions(-)

diff --git a/board/zyxel/nsa310s/nsa310s.c b/board/zyxel/nsa310s/nsa310s.c
index cd4a7723b1..b71de4e11f 100644
--- a/board/zyxel/nsa310s/nsa310s.c
+++ b/board/zyxel/nsa310s/nsa310s.c
@@ -1,8 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Copyright (C) 2015
- * Gerald Kerma <drea...@doukki.net>
- * Tony Dinh <mibo...@gmail.com>
+ * Copyright (C) 2015, 2021 Tony Dinh <mibo...@gmail.com>
+ * Copyright (C) 2015 Gerald Kerma <drea...@doukki.net>
  */
 
 #include <common.h>
@@ -81,21 +80,51 @@ 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
 void reset_phy(void)
 {
        u16 reg;
        u16 phyaddr;
-       char *name = "egiga0";
+       char *name = "ethernet-controller@72000";
+       char *eth0_path = 
"/ocp@f1000000/ethernet-controller@72000/ethernet0-port@0";
 
        if (miiphy_set_current_dev(name))
                return;
 
-       /* read PHY dev address */
-       if (miiphy_read(name, 0xee, 0xee, (u16 *) &phyaddr)) {
-               printf("could not read PHY dev address\n");
+       phyaddr = fdt_get_phy_addr(eth0_path);
+       if (phyaddr < 0)
                return;
-       }
 
        /* set RGMII delay */
        miiphy_write(name, phyaddr, MV88E1318_PGADR_REG, MV88E1318_MAC_CTRL_PG);
@@ -131,5 +160,7 @@ void reset_phy(void)
        /* downshift */
        miiphy_write(name, phyaddr, 0x10, 0x3860);
        miiphy_write(name, phyaddr, 0x0, 0x9140);
+
+       printf("MV88E1318 PHY initialized on %s\n", name);
 }
 #endif /* CONFIG_RESET_PHY_R */
-- 
2.20.1