[PATCH net-next 2/9] dt-bindings: net: add backplane dt bindings

[Florinel Iordache <florinel.iordache@nxp.com>]

Add ethernet backplane device tree bindings

Signed-off-by: Florinel Iordache <florinel.iordache@nxp.com>
---
 .../bindings/net/ethernet-controller.yaml          |  3 +-
 .../devicetree/bindings/net/ethernet-phy.yaml      | 53 +++++++++++++
 Documentation/devicetree/bindings/net/serdes.yaml  | 90 ++++++++++++++++++++++
 3 files changed, 145 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/net/serdes.yaml

diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
index ac471b6..541cee5 100644
--- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml
+++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
@@ -93,8 +93,9 @@ properties:
       - rxaui
       - xaui
 
-      # 10GBASE-KR, XFI, SFI
+      # 10GBASE-KR, 40GBASE-KR4, XFI, SFI
       - 10gbase-kr
+      - 40gbase-kr4
       - usxgmii
 
   phy-mode:
diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
index 8927941..2fb377e 100644
--- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
+++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
@@ -158,6 +158,42 @@ properties:
     description:
       Specifies a reference to a node representing a SFP cage.
 
+  eq-algorithm:
+    oneOf:
+      - const: fixed
+        description:
+          Backplane KR using fixed coefficients meaning no
+          equalization algorithm
+      - const: bee
+        description:
+          Backplane KR using 3-Taps Bit Edge Equalization (BEE)
+          algorithm
+        description:
+          Specifies the desired equalization algorithm to be used
+          by the KR link training
+
+  eq-init:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 3
+    maxItems: 3
+        description:
+          Triplet of KR coefficients. Specifies the initialization
+	  values for standard KR equalization coefficients used by
+	  the link training: pre-cursor, post-cursor, main-cursor
+
+  eq-params:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+        description:
+          Variable size array of KR parameters. Specifies the HW
+	  specific parameters used by the link training
+
+  lane-handle:
+    $ref: /schemas/types.yaml#definitions/phandle
+    description:
+      Specifies a reference (or array of references) to a node
+      representing the desired SERDES lane (or lanes) used in
+      backplane mode
+
 required:
   - reg
 
@@ -180,3 +216,20 @@ examples:
             reset-deassert-us = <2000>;
         };
     };
+  - |
+    /* Backplane configurations for specific setup */
+    &mdio9 {
+        bpphy6: ethernet-phy@0 {
+            compatible = "ethernet-phy-ieee802.3-c45";
+            reg = <0x0>;
+            lane-handle = <&lane_d>; /* use lane D */
+            eq-algorithm = "bee";
+            /* 10G Short cables setup: up to 30 cm cable */
+            eq-init = <0x2 0x5 0x29>;
+            eq-params = <0>;
+        };
+    };
+    &mac9 {
+        phy-connection-type = "10gbase-kr";
+        phy-handle = <&bpphy6>;
+    };
diff --git a/Documentation/devicetree/bindings/net/serdes.yaml b/Documentation/devicetree/bindings/net/serdes.yaml
new file mode 100644
index 0000000..965152f
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/serdes.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/serdes.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Serdes Module Binding
+
+maintainers:
+  - Florinel Iordache <florinel.iordache@nxp.com>
+
+properties:
+  $nodename:
+    pattern: "^serdes(@[a-f0-9]+)?$"
+
+  compatible:
+    oneOf:
+      - const: serdes-10g
+        description: SerDes module type of 10G
+      - const: serdes-28g
+        description: SerDes module type of 28G
+
+  reg:
+    description:
+      Registers memory map offset and size for this serdes module
+
+  reg-names:
+    description:
+      Names of the register map given in "reg" node.
+      Should be one of the following according to serdes type:
+      "serdes", "serdes-10g", "serdes-28g"
+
+  little-endian:
+    description:
+      Specifies the endianness of serdes module
+      For complete definition see:
+      Documentation/devicetree/bindings/common-properties.txt
+
+  #address-cells:
+    description: Must be <1>
+
+  #size-cells:
+    description: Must be <1>
+
+  ranges:
+    description:
+      Address range of serdes module.
+
+properties:
+  $nodename:
+    pattern: "^lane(@[a-f0-9]+)?$"
+
+  compatible:
+    oneOf:
+      - const: lane-10g
+        description: Lane part of a 10G SerDes module
+      - const: lane-28g
+        description: Lane part of a 28G SerDes module
+
+  reg:
+    description:
+      Registers memory map offset and size for this lane
+
+  reg-names:
+    description:
+      Names of the register map given in "reg" node.
+      Should be one of the following: "lane", "serdes-lane"
+
+examples:
+  - |
+    serdes1: serdes@1ea0000 {
+        compatible = "serdes-10g";
+        reg = <0x0 0x1ea0000 0 0x00002000>;
+        reg-names = "serdes", "serdes-10g";
+        little-endian;
+
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges = <0x0 0x00 0x1ea0000 0x00002000>;
+        lane_a: lane@800 {
+            compatible = "lane-10g";
+            reg = <0x800 0x40>;
+            reg-names = "lane", "serdes-lane";
+        };
+        lane_b: lane@840 {
+            compatible = "lane-10g";
+            reg = <0x840 0x40>;
+            reg-names = "lane", "serdes-lane";
+        };
+    };
-- 
1.9.1