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-rw-r--r--doc/device-tree-bindings/net/fsl-tsec-phy.txt21
1 files changed, 21 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/net/fsl-tsec-phy.txt b/doc/device-tree-bindings/net/fsl-tsec-phy.txt
index dbe91aa..c5bf48c 100644
--- a/doc/device-tree-bindings/net/fsl-tsec-phy.txt
+++ b/doc/device-tree-bindings/net/fsl-tsec-phy.txt
@@ -41,3 +41,24 @@ Example:
reg = <0>;
};
};
+
+* TBI Internal MDIO bus
+
+As of this writing, every tsec is associated with an internal TBI PHY.
+This PHY is accessed through the local MDIO bus. These buses are defined
+similarly to the mdio buses. The TBI PHYs underneath them are similar to
+normal PHYs, but the reg property is considered instructive, rather than
+descriptive. The reg property should be chosen so it doesn't interfere
+with other PHYs on the bus. The TBI PHYs are referred to by a "tbi-handle"
+property under the tsec node, which has a similar meaning of "phy-handle".
+
+Example:
+ ethernet@24000 {
+ phy-handle = <&tbi1>;
+ };
+
+ mdio@24520 {
+ tbi1: tbi-phy@1f {
+ reg = <0x1f>;
+ };
+ };