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