linux-kernel - [PATCH net-next 1/2] dt-bindings: net: xlnx,axi-ethernet: Add bindings for AXI 2.5G MAC

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Message-ID: <20241118081822.19383-2-suraj.gupta2@amd.com>
Date: Mon, 18 Nov 2024 13:48:21 +0530
From: Suraj Gupta <suraj.gupta2@....com>
To: <andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <michal.simek@....com>,
	<sean.anderson@...ux.dev>, <radhey.shyam.pandey@....com>, <horms@...nel.org>
CC: <netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <git@....com>, <harini.katakam@....com>
Subject: [PATCH net-next 1/2] dt-bindings: net: xlnx,axi-ethernet: Add bindings for AXI 2.5G MAC

AXI 1G/2.5G Ethernet subsystem supports 1G and 2.5G speeds. "max-speed"
property is used to distinguish 1G and 2.5G MACs of AXI 1G/2.5G IP.
max-speed is made a required property, and it breaks DT ABI but driver
implementation ensures backward compatibility and assumes 1G when this
property is absent.
Modify existing bindings description for 2.5G MAC.

Signed-off-by: Suraj Gupta <suraj.gupta2@....com>
---
 .../bindings/net/xlnx,axi-ethernet.yaml       | 44 +++++++++++++++++--
 1 file changed, 40 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml b/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
index fb02e579463c..69e84e2e2b63 100644
--- a/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
+++ b/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
@@ -9,10 +9,12 @@ title: AXI 1G/2.5G Ethernet Subsystem
 description: |
   Also called  AXI 1G/2.5G Ethernet Subsystem, the xilinx axi ethernet IP core
   provides connectivity to an external ethernet PHY supporting different
-  interfaces: MII, GMII, RGMII, SGMII, 1000BaseX. It also includes two
+  interfaces: MII, GMII, RGMII, SGMII, 1000BaseX and 2500BaseX. It also includes two
   segments of memory for buffering TX and RX, as well as the capability of
   offloading TX/RX checksum calculation off the processor.
 
+  AXI 2.5G MAC is incremental speed upgrade of AXI 1G and supports 2.5G speed.
+
   Management configuration is done through the AXI interface, while payload is
   sent and received through means of an AXI DMA controller. This driver
   includes the DMA driver code, so this driver is incompatible with AXI DMA
@@ -62,6 +64,7 @@ properties:
       - rgmii
       - sgmii
       - 1000base-x
+      - 2500base-x
 
   xlnx,phy-type:
     description:
@@ -118,9 +121,9 @@ properties:
     type: object
 
   pcs-handle:
-    description: Phandle to the internal PCS/PMA PHY in SGMII or 1000Base-X
-      modes, where "pcs-handle" should be used to point to the PCS/PMA PHY,
-      and "phy-handle" should point to an external PHY if exists.
+    description: Phandle to the internal PCS/PMA PHY in SGMII or 1000base-x/
+      2500base-x modes, where "pcs-handle" should be used to point to the
+      PCS/PMA PHY, and "phy-handle" should point to an external PHY if exists.
     maxItems: 1
 
   dmas:
@@ -137,12 +140,17 @@ properties:
     minItems: 2
     maxItems: 32
 
+  max-speed:
+    description:
+      Indicates max MAC rate. 1G and 2.5G MACs of AXI 1G/2.5G IP are distinguished using it.
+
 required:
   - compatible
   - interrupts
   - reg
   - xlnx,rxmem
   - phy-handle
+  - max-speed
 
 allOf:
   - $ref: /schemas/net/ethernet-controller.yaml#
@@ -164,6 +172,7 @@ examples:
         xlnx,rxmem = <0x800>;
         xlnx,txcsum = <0x2>;
         phy-handle = <&phy0>;
+        max-speed = <1000>;
 
         mdio {
             #address-cells = <1>;
@@ -188,6 +197,7 @@ examples:
         xlnx,txcsum = <0x2>;
         phy-handle = <&phy1>;
         axistream-connected = <&dma>;
+        max-speed = <1000>;
 
         mdio {
             #address-cells = <1>;
@@ -198,3 +208,29 @@ examples:
             };
         };
     };
+
+# AXI 2.5G MAC
+  - |
+    axi_ethernet_eth2: ethernet@...00000 {
+        compatible = "xlnx,axi-ethernet-1.00.a";
+        interrupts = <0>;
+        clock-names = "s_axi_lite_clk", "axis_clk", "ref_clk", "mgt_clk";
+        clocks = <&axi_clk>, <&axi_clk>, <&pl_enet_ref_clk>, <&mgt_clk>;
+        phy-mode = "2500base-x";
+        reg = <0x40000000 0x40000>;
+        xlnx,rxcsum = <0x2>;
+        xlnx,rxmem = <0x800>;
+        xlnx,txcsum = <0x2>;
+        phy-handle = <&phy1>;
+        axistream-connected = <&dma>;
+        max-speed = <2500>;
+
+        mdio {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            phy2: ethernet-phy@1 {
+                device_type = "ethernet-phy";
+                reg = <1>;
+            };
+        };
+    };
-- 
2.25.1