amd-xgbe-phy: Allow certain PHY settings to be set by UEFI

Certain PHY settings need to be configurable by UEFI depending on the
platform being used.  Add new device tree / ACPI properties that, if
present, will override the pre-determined values currently used.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/net/amd-xgbe-phy.txt b/Documentation/devicetree/bindings/net/amd-xgbe-phy.txt
index d54fe1af0325..33df3932168e 100644
--- a/Documentation/devicetree/bindings/net/amd-xgbe-phy.txt
+++ b/Documentation/devicetree/bindings/net/amd-xgbe-phy.txt
@@ -16,6 +16,18 @@ Optional properties:
     0 - 1GbE and 10GbE (default)
     1 - 2.5GbE and 10GbE
 
+The following optional properties are represented by an array with each
+value corresponding to a particular speed. The first array value represents
+the setting for the 1GbE speed, the second value for the 2.5GbE speed and
+the third value for the 10GbE speed.  All three values are required if the
+property is used.
+- amd,serdes-blwc: Baseline wandering correction enablement
+    0 - Off
+    1 - On
+- amd,serdes-cdr-rate: CDR rate speed selection
+- amd,serdes-pq-skew: PQ (data sampling) skew
+- amd,serdes-tx-amp: TX amplitude boost
+
 Example:
         xgbe_phy@e1240800 {
                 compatible = "amd,xgbe-phy-seattle-v1a", "ethernet-phy-ieee802.3-c45";
@@ -25,4 +37,8 @@ Example:
                 interrupt-parent = <&gic>;
                 interrupts = <0 323 4>;
                 amd,speed-set = <0>;
+                amd,serdes-blwc = <1>, <1>, <0>;
+                amd,serdes-cdr-rate = <2>, <2>, <7>;
+                amd,serdes-pq-skew = <10>, <10>, <30>;
+                amd,serdes-tx-amp = <15>, <15>, <10>;
         };