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-rw-r--r--Documentation/devicetree/bindings/net/micrel-ksz90x1.txt13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt b/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
index 2f71e73..9c84f3d 100644
--- a/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
+++ b/Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
@@ -63,8 +63,21 @@ KSZ9131:
step is 100ps. Unlike KSZ9031, the values represent picoseccond delays.
A negative value can be assigned as rxc-skew-psec = <(-100)>;.
+ The KSZ9131 provides additional 2ns delay register for RXC and TXC signals
+ with the RX DLL and TX DLL Control Register. This is a self adjusting delay
+ locked loop that maintains 2ns of delay for either RXC or TXC register.
+
Optional properties:
+ - rxc-dll-2ns : 1 to enable 2ns dll controlled delay on RXC
+ 0 to disable this delay.
+ If omitted, register will not be touched. The
+ delay is enabled by default by hardware.
+ - txc-dll-2ns : 1 to enable 2ns dll controlled delay on TXC
+ 0 to disable this delay.
+ If omitted, register will not be touched. The
+ delay is disabled by default by hardware.
+
Range of the value -700 to 2400, default value 0:
- rxc-skew-psec : Skew control of RX clock pad