linux-kernel - [RFC net-next PATCH 02/16] dt-bindings: net: Add binding for Xilinx PCS

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Date:   Mon,  4 Oct 2021 15:15:13 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Sean Anderson <sean.anderson@...o.com>,
        Michal Simek <michal.simek@...inx.com>,
        Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org
Subject: [RFC net-next PATCH 02/16] dt-bindings: net: Add binding for Xilinx PCS

This adds a binding for the Xilinx 1G/2.5G Ethernet PCS/PMA or SGMII
LogiCORE IP. This device is a soft device typically used to adapt between
GMII and SGMII or 1000BASE-X (in combination with a suitable SERDES). The
standard property is roughly analogous to the interface property of
ethernet controllers, except that it has an additional value used to
indicate that dynamic switching is supported. Note that switching is
supported only between SGMII and 1000BASE-X, and only if the appropriate
parameter is set when the device is synthesized. The property name was
chosen to align with the terminology in the datasheet. I also considered
"mdi", but that is a bit of a misnomer in the case of SGMII.

Signed-off-by: Sean Anderson <sean.anderson@...o.com>
---

 .../devicetree/bindings/net/xilinx,pcs.yaml   | 83 +++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/xilinx,pcs.yaml

diff --git a/Documentation/devicetree/bindings/net/xilinx,pcs.yaml b/Documentation/devicetree/bindings/net/xilinx,pcs.yaml
new file mode 100644
index 000000000000..43750dcb4b11
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/xilinx,pcs.yaml
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/xilinx,pcs.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx 1G/2.5G Ethernet PCS/PMA or SGMII LogiCORE IP
+
+maintainers:
+  - Sean Anderson <sean.anderson@...o.com>
+
+description:
+  This is a soft device which converts between GMII and SGMII, 2.5G SGMII,
+  1000BASE-X, or 2500BASE-X. It may have an attached SERDES, or may talk
+  directly to LVDS.
+
+allOf:
+  - $ref: "ethernet-controller.yaml#"
+
+properties:
+  compatible:
+    contains:
+      const:
+        - xilinx,pcs-16.2
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+    items:
+      - description: The reference clock for the PMD, which is typically a
+                     SERDES but may be a direct interface to LVDS I/Os.
+                     Depending on your setup, this may be the gtrefclk, refclk,
+                     or clk125m signal.
+
+  clock-names:
+    const: refclk
+
+  resets:
+    maxItems: 1
+
+  reset-names:
+    const: pcs
+
+  standard:
+    description:
+      The interface standard that the PCS supports. The sgmii/1000base-x
+      setting indicates that the PCS supports dynamically switching between
+      SGMII and 1000BASE-X.
+    enum:
+      - sgmii
+      - 1000base-x
+      - sgmii/1000base-x
+      - 2500base-x
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - standard
+
+additionalProperties: false
+
+examples:
+  - |
+    mdio {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        pcs0: ethernet-pcs@0 {
+            compatible = "xlnx,pcs-16.2";
+            reg = <0>;
+            clocks = <&si570>;
+            clock-names = "refclk";
+            resets = <&pcs_reset 1>;
+            reset-names = "pcs";
+            standard = "sgmii/1000base-x";
+        };
+    };
-- 
2.25.1