diff options
Diffstat (limited to 'doc/device-tree-bindings/net/micrel-ksz90x1.txt')
| -rw-r--r-- | doc/device-tree-bindings/net/micrel-ksz90x1.txt | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/net/micrel-ksz90x1.txt b/doc/device-tree-bindings/net/micrel-ksz90x1.txt index 307f53f726..a214d35fc9 100644 --- a/doc/device-tree-bindings/net/micrel-ksz90x1.txt +++ b/doc/device-tree-bindings/net/micrel-ksz90x1.txt @@ -14,6 +14,33 @@ KSZ9021: value is 0, the maximum value is 1800, and it is incremented by 120ps steps. + The KSZ9021 hardware supports a range of skew values from negative to + positive, where the specific range is property dependent. All values + specified in the devicetree are offset by the minimum value so they + can be represented as positive integers in the devicetree since it's + difficult to represent a negative number in the devictree. + + The following 4-bit values table applies to all the skew properties: + + Pad Skew Value Delay (ps) Devicetree Value + ------------------------------------------------------ + 0000 -840ps 0 + 0001 -720ps 120 + 0010 -600ps 240 + 0011 -480ps 360 + 0100 -360ps 480 + 0101 -240ps 600 + 0110 -120ps 720 + 0111 0ps 840 + 1000 120ps 960 + 1001 240ps 1080 + 1010 360ps 1200 + 1011 480ps 1320 + 1100 600ps 1440 + 1101 720ps 1560 + 1110 840ps 1680 + 1111 960ps 1800 + Optional properties: - rxc-skew-ps : Skew control of RXC pad |