powerpc: Add support for multiple gfar mdio interfaces

The old code assumed there was only one, but the 8572 actually has 3.

Also, our usual id, 0xe0024520, gets resolved to -1 somewhere, and this was
preventing the multiple buses from having different ids.  So we only keep
the low 20 bits, which have the interesting info, anyway.
Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/sysdev/fsl_soc.c

@@ -207,38 +207,26 @@ static int __init of_add_fixed_phys(void)
 arch_initcall(of_add_fixed_phys);
 #endif /* CONFIG_FIXED_PHY */
 
-static int __init gfar_mdio_of_init(void)
+static int gfar_mdio_of_init_one(struct device_node *np)
 {
-	struct device_node *np = NULL;
-	struct platform_device *mdio_dev;
-	struct resource res;
-	int ret;
-
-	np = of_find_compatible_node(np, NULL, "fsl,gianfar-mdio");
-
-	/* try the deprecated version */
-	if (!np)
-		np = of_find_compatible_node(np, "mdio", "gianfar");
-
-	if (np) {
 	int k;
 	struct device_node *child = NULL;
 	struct gianfar_mdio_data mdio_data;
+	struct platform_device *mdio_dev;
+	struct resource res;
+	int ret;
 
 	memset(&res, 0, sizeof(res));
 	memset(&mdio_data, 0, sizeof(mdio_data));
 
 	ret = of_address_to_resource(np, 0, &res);
 	if (ret)
-			goto err;
+		return ret;
 
-		mdio_dev =
-		    platform_device_register_simple("fsl-gianfar_mdio",
-						    res.start, &res, 1);
-		if (IS_ERR(mdio_dev)) {
-			ret = PTR_ERR(mdio_dev);
-			goto err;
-		}
+	mdio_dev = platform_device_register_simple("fsl-gianfar_mdio",
+			res.start&0xfffff, &res, 1);
+	if (IS_ERR(mdio_dev))
+		return PTR_ERR(mdio_dev);
 
 	for (k = 0; k < 32; k++)
 		mdio_data.irq[k] = PHY_POLL;
@@ -246,29 +234,33 @@ static int __init gfar_mdio_of_init(void)
 	while ((child = of_get_next_child(np, child)) != NULL) {
 		int irq = irq_of_parse_and_map(child, 0);
 		if (irq != NO_IRQ) {
-				const u32 *id = of_get_property(child,
-							"reg", NULL);
+			const u32 *id = of_get_property(child, "reg", NULL);
 			mdio_data.irq[*id] = irq;
 		}
 	}
 
-		ret =
-		    platform_device_add_data(mdio_dev, &mdio_data,
+	ret = platform_device_add_data(mdio_dev, &mdio_data,
 				sizeof(struct gianfar_mdio_data));
 	if (ret)
-			goto unreg;
-	}
-
-	of_node_put(np);
-	return 0;
-
-unreg:
 		platform_device_unregister(mdio_dev);
-err:
-	of_node_put(np);
+
 	return ret;
 }
 
+static int __init gfar_mdio_of_init(void)
+{
+	struct device_node *np = NULL;
+
+	for_each_compatible_node(np, NULL, "fsl,gianfar-mdio")
+		gfar_mdio_of_init_one(np);
+
+	/* try the deprecated version */
+	for_each_compatible_node(np, "mdio", "gianfar");
+		gfar_mdio_of_init_one(np);
+
+	return 0;
+}
+
 arch_initcall(gfar_mdio_of_init);
 
 static const char *gfar_tx_intr = "tx";
@@ -393,7 +385,7 @@ static int __init gfar_of_init(void)
 
 			gfar_data.phy_id = *id;
 			snprintf(gfar_data.bus_id, MII_BUS_ID_SIZE, "%llx",
-				 (unsigned long long)res.start);
+				 (unsigned long long)res.start&0xfffff);
 
 			of_node_put(phy);
 			of_node_put(mdio);