Subject: Fix problems with Holly's DT representation of ethernet PHYs

From: David Gibson <[email-masked]>
Date: Tue, 29 May 2007 16:05:41 +1000

This patch fixes some problems with the way the Ethernet PHYs are
represented in the device tree for the Holly board.  This means
changes to the dts itself, and to the code with instantiates the
tsi108 ethernet platform devices based on the device tree.

	- First, and most importantly, the PHYs are given with an
identical 'reg' property.  This reg currently encodes the accessible
register used to initiate mdio interaction with the PHYs, rather than
a meaningful address on the parent bus (mdio in this case), which is
incorrect.  Instead we give the address of these registers as 'reg' in
the mdio node itself, and encode the ID of each phy in their 'reg'
propertyies.  The PHY's unit name addresses are updated to match.
	- Second, the PHYs give only "bcm54xx" as a compatible
property.  This is broken, since there are many bcm54xx PHY models,
and they have differences which can matter.  We replace the compatible
property with the precise PHY model, bcm5461a in this case.
	- Third, the node representing the mdio link had a compatible
property of "tsi-ethernet", identical to the ethernet MAC nodes.  This
is clearly incorrect, since it's a different sort of device, and
replaced with "tsi-mdio".
	- Finally, currently the platform device constructor enables a
workaround in the tsi108 ethernet driver based on the compatible
property of the PHY.  This is incorrect, because the workaround in
question is necessary due to the board's wiring of the PHY, not the
model of PHY itself.  This patch alters the constructor to instead
enable the workaround based on a new special property in the PHY node.

Signed-off-by: David Gibson <[email-masked]>
---

Fixed various problems pointed out in feedback.

Index: working-2.6/arch/powerpc/boot/dts/holly.dts
===================================================================
--- working-2.6.orig/arch/powerpc/boot/dts/holly.dts	2007-05-29 14:38:58.000000000 +1000
+++ working-2.6/arch/powerpc/boot/dts/holly.dts	2007-05-29 14:49:55.000000000 +1000
@@ -60,22 +60,23 @@
 			reg = <7000 400>;
 		};
 
-		mdio@6000 {
+		MDIO: mdio@6000 {
 			device_type = "mdio";
-			compatible = "tsi-ethernet";
+			compatible = "tsi-mdio";
+			reg = <6000 50>;
+			#address-cells = <1>;
+			#size-cells = <0>;
 
-			PHY1: ethernet-phy@6000 {
-				device_type = "ethernet-phy";
-				compatible = "bcm54xx";
-				reg = <6000 50>;
-				phy-id = <1>;
+			PHY1: ethernet-phy@1 {
+				compatible = "bcm5461a";
+				reg = <1>;
+				txc-rxc-delay-disable;
 			};
 
-			PHY2: ethernet-phy@6400 {
-				device_type = "ethernet-phy";
-				compatible = "bcm54xx";
-				reg = <6000 50>;
-				phy-id = <2>;
+			PHY2: ethernet-phy@2 {
+				compatible = "bcm5461a";
+				reg = <2>;
+				txc-rxc-delay-disable;
 			};
 		};
 
@@ -88,6 +89,7 @@
 			local-mac-address = [ 00 00 00 00 00 00 ];
 			interrupt-parent = < &/tsi109@c0000000/pic@7400 >;
 			interrupts = <10 2>;
+			mdio-handle = <&MDIO>;
 			phy-handle = <&PHY1>;
 		};
 
@@ -100,6 +102,7 @@
 			local-mac-address = [ 00 00 00 00 00 00 ];
 			interrupt-parent = < &/tsi109@c0000000/pic@7400 >;
 			interrupts = <11 2>;
+			mdio-handle = <&MDIO>;
 			phy-handle = <&PHY2>;
 		};
 
Index: working-2.6/arch/powerpc/sysdev/tsi108_dev.c
===================================================================
--- working-2.6.orig/arch/powerpc/sysdev/tsi108_dev.c	2007-05-08 14:58:06.000000000 +1000
+++ working-2.6/arch/powerpc/sysdev/tsi108_dev.c	2007-05-29 14:57:20.000000000 +1000
@@ -75,9 +75,8 @@ static int __init tsi108_eth_of_init(voi
 	     (np = of_find_compatible_node(np, "network", "tsi-ethernet")) != NULL;
 	     i++) {
 		struct resource r[2];
-		struct device_node *phy;
+		struct device_node *phy, *mdio;
 		hw_info tsi_eth_data;
-		const unsigned int *id;
 		const unsigned int *phy_id;
 		const void *mac_addr;
 		const phandle *ph;
@@ -111,6 +110,13 @@ static int __init tsi108_eth_of_init(voi
 		if (mac_addr)
 			memcpy(tsi_eth_data.mac_addr, mac_addr, 6);
 
+		ph = of_get_property(np, "mdio-handle", NULL);
+		mdio = of_find_node_by_phandle(*ph);
+		ret = of_address_to_resource(mdio, 0, &res);
+		of_node_put(mdio);
+		if (ret)
+			goto unreg;
+
 		ph = of_get_property(np, "phy-handle", NULL);
 		phy = of_find_node_by_phandle(*ph);
 
@@ -119,20 +125,25 @@ static int __init tsi108_eth_of_init(voi
 			goto unreg;
 		}
 
-		id = of_get_property(phy, "reg", NULL);
-		phy_id = of_get_property(phy, "phy-id", NULL);
-		ret = of_address_to_resource(phy, 0, &res);
-		if (ret) {
-			of_node_put(phy);
-			goto unreg;
-		}
+		phy_id = of_get_property(phy, "reg", NULL);
+
 		tsi_eth_data.regs = r[0].start;
 		tsi_eth_data.phyregs = res.start;
 		tsi_eth_data.phy = *phy_id;
 		tsi_eth_data.irq_num = irq_of_parse_and_map(np, 0);
-		if (of_device_is_compatible(phy, "bcm54xx"))
+
+		/* Some boards with the TSI108 bridge (e.g. Holly)
+		 * have a miswiring of the ethernet PHYs which
+		 * requires a workaround.  The special
+		 * "txc-rxc-delay-disable" property enables this
+		 * workaround.  FIXME: Need to port the tsi108_eth
+		 * driver itself to phylib and use a non-misleading
+		 * name for the workaround flag - it's not actually to
+		 * do with the model of PHY in use */
+		if (of_get_property(phy, "txc-rxc-delay-disable", NULL))
 			tsi_eth_data.phy_type = TSI108_PHY_BCM54XX;
 		of_node_put(phy);
+
 		ret =
 		    platform_device_add_data(tsi_eth_dev, &tsi_eth_data,
 					     sizeof(hw_info));
Index: working-2.6/arch/powerpc/boot/dts/mpc7448hpc2.dts
===================================================================
--- working-2.6.orig/arch/powerpc/boot/dts/mpc7448hpc2.dts	2007-05-21 12:47:17.000000000 +1000
+++ working-2.6/arch/powerpc/boot/dts/mpc7448hpc2.dts	2007-05-29 14:38:58.000000000 +1000
@@ -58,24 +58,23 @@
 			compatible  = "tsi-i2c";
 		};
 
-		mdio@6000 {
+		MDIO: mdio@6000 {
 			device_type = "mdio";
 			compatible = "tsi-ethernet";
+			reg = <6000 50>;
+			#address-cells = <1>;
+			#size-cells = <0>;
 
-			phy8: ethernet-phy@6000 {
+			phy8: ethernet-phy@8 {
 				interrupt-parent = <&mpic>;
 				interrupts = <2 1>;
-				reg = <6000 50>;
-				phy-id = <8>;
-				device_type = "ethernet-phy";
+				reg = <8>;
 			};
 
-			phy9: ethernet-phy@6400 {
+			phy9: ethernet-phy@9 {
 				interrupt-parent = <&mpic>;
 				interrupts = <2 1>;
-				reg = <6000 50>;
-				phy-id = <9>;
-				device_type = "ethernet-phy";
+				reg = <9>;
 			};
 
 		};
@@ -89,6 +88,7 @@
 			address = [ 00 06 D2 00 00 01 ];
 			interrupts = <10 2>;
 			interrupt-parent = <&mpic>;
+			mdio-handle = <&MDIO>;
 			phy-handle = <&phy8>;
 		};
 
@@ -102,6 +102,7 @@
 			address = [ 00 06 D2 00 00 02 ];
 			interrupts = <11 2>;
 			interrupt-parent = <&mpic>;
+			mdio-handle = <&MDIO>;
 			phy-handle = <&phy9>;
 		};

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson