dt: emac: document device-tree based phy discovery and setup

This patch adds documentation for a new "phy-handle" property,
"fixed-link" and "mdio" sub-node. These allows the enumeration
of PHYs which are supported by the phy library under drivers/net/phy.

The EMAC ethernet controller in IBM and AMCC 4xx chips is
currently stuck with a few privately defined phy
implementations. It has no support for PHYs which
are supported by the generic phylib.

Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/devicetree/bindings/powerpc/4xx/emac.txt b/Documentation/devicetree/bindings/powerpc/4xx/emac.txt
index 712baf6c3e246fa9ea93c6bab4cb8f294b894d86..44b842b6ca154d9c13c3d0da6a784fe54195fcf9 100644 (file)
--- a/Documentation/devicetree/bindings/powerpc/4xx/emac.txt
+++ b/Documentation/devicetree/bindings/powerpc/4xx/emac.txt
@@ -71,6 +71,9 @@
                          For Axon it can be absent, though my current driver
                          doesn't handle phy-address yet so for now, keep
                          0x00ffffff in it.
+    - phy-handle       : Used to describe configurations where a external PHY
+                         is used. Please refer to:
+                         Documentation/devicetree/bindings/net/ethernet.txt
     - rx-fifo-size-gige : 1 cell, Rx fifo size in bytes for 1000 Mb/sec
                          operations (if absent the value is the same as
                          rx-fifo-size).  For Axon, either absent or 2048.
@@ -81,8 +84,22 @@
                          offload, phandle of the TAH device node.
     - tah-channel       : 1 cell, optional. If appropriate, channel used on the
                          TAH engine.
+    - fixed-link       : Fixed-link subnode describing a link to a non-MDIO
+                         managed entity. See
+                         Documentation/devicetree/bindings/net/fixed-link.txt
+                         for details.
+    - mdio subnode     : When the EMAC has a phy connected to its local
+                         mdio, which us supported by the kernel's network
+                         PHY library in drivers/net/phy, there must be device
+                         tree subnode with the following required properties:
+                               - #address-cells: Must be <1>.
+                               - #size-cells: Must be <0>.
 
-    Example:
+                         For PHY definitions: Please refer to
+                         Documentation/devicetree/bindings/net/phy.txt and
+                         Documentation/devicetree/bindings/net/ethernet.txt
+
+    Examples:
 
        EMAC0: ethernet@40000800 {
                device_type = "network";
@@ -104,6 +121,48 @@
                zmii-channel = <0>;
        };
 
+       EMAC1: ethernet@ef600c00 {
+               device_type = "network";
+               compatible = "ibm,emac-apm821xx", "ibm,emac4sync";
+               interrupt-parent = <&EMAC1>;
+               interrupts = <0 1>;
+               #interrupt-cells = <1>;
+               #address-cells = <0>;
+               #size-cells = <0>;
+               interrupt-map = <0 &UIC2 0x10 IRQ_TYPE_LEVEL_HIGH /* Status */
+                                1 &UIC2 0x14 IRQ_TYPE_LEVEL_HIGH /* Wake */>;
+               reg = <0xef600c00 0x000000c4>;
+               local-mac-address = [000000000000]; /* Filled in by U-Boot */
+               mal-device = <&MAL0>;
+               mal-tx-channel = <0>;
+               mal-rx-channel = <0>;
+               cell-index = <0>;
+               max-frame-size = <9000>;
+               rx-fifo-size = <16384>;
+               tx-fifo-size = <2048>;
+               fifo-entry-size = <10>;
+               phy-mode = "rgmii";
+               phy-handle = <&phy0>;
+               phy-map = <0x00000000>;
+               rgmii-device = <&RGMII0>;
+               rgmii-channel = <0>;
+               tah-device = <&TAH0>;
+               tah-channel = <0>;
+               has-inverted-stacr-oc;
+               has-new-stacr-staopc;
+
+               mdio {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       phy0: ethernet-phy@0 {
+                               compatible = "ethernet-phy-ieee802.3-c22";
+                               reg = <0>;
+                       };
+               };
+       };
+
+
       ii) McMAL node
 
     Required properties:
@@ -145,4 +204,3 @@
     - revision           : as provided by the RGMII new version register if
                           available.
                           For Axon: 0x0000012a
-