dt-bindings: add an explanation for internal phy-mode

When working on the Allwinner internal PHY, the first work was to use
the "internal" mode, but some answer was made my mail on what are really
internal mean for PHY.

This patch write that in the doc.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/devicetree/bindings/net/ethernet.txt b/Documentation/devicetree/bindings/net/ethernet.txt
index 2974e63ba311aa4d053ee32cd63baea3c415d756..a6862158058461f5af428498ea14c98aed1f7775 100644 (file)
--- a/Documentation/devicetree/bindings/net/ethernet.txt
+++ b/Documentation/devicetree/bindings/net/ethernet.txt
@@ -16,7 +16,8 @@ Documentation/devicetree/bindings/phy/phy-bindings.txt.
   Specification).
 - phy-mode: string, operation mode of the PHY interface. This is now a de-facto
   standard property; supported values are:
-  * "internal"
+  * "internal" (Internal means there is not a standard bus between the MAC and
+     the PHY, something proprietary is being used to embed the PHY in the MAC.)
   * "mii"
   * "gmii"
   * "sgmii"