net: nixge: Make mdio child node optional

Make MDIO child optional and only instantiate the
MDIO bus if the child is actually present.

There are currently no (in-tree) users of this
binding; all (out-of-tree) users use overlays that
get shipped together with the FPGA images that contain
the IP.

This will significantly increase maintainabilty
of future revisions of this IP.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 3 deletions

diff --git a/Documentation/devicetree/bindings/net/nixge.txt b/Documentation/devicetree/bindings/net/nixge.txt
index 44a7358b4399..bb2929f9c64f 100644
--- a/Documentation/devicetree/bindings/net/nixge.txt
+++ b/Documentation/devicetree/bindings/net/nixge.txt
@@ -16,6 +16,9 @@ Required properties:
 - nvmem-cells: Phandle of nvmem cell containing the MAC address
 - nvmem-cell-names: Should be "address"
 
+Optional properties:
+- mdio subnode to indicate presence of MDIO controller
+
 Examples (10G generic PHY):
 	nixge0: ethernet@40000000 {
 		compatible = "ni,xge-enet-3.00";
@@ -33,8 +36,26 @@ Examples (10G generic PHY):
 		phy-mode = "xgmii";
 		phy-handle = <&ethernet_phy1>;
 
-		ethernet_phy1: ethernet-phy@4 {
-			compatible = "ethernet-phy-ieee802.3-c45";
-			reg = <4>;
+		mdio {
+			ethernet_phy1: ethernet-phy@4 {
+				compatible = "ethernet-phy-ieee802.3-c45";
+				reg = <4>;
+			};
 		};
 	};
+
+Examples (10G generic PHY, no MDIO):
+	nixge0: ethernet@40000000 {
+		compatible = "ni,xge-enet-2.00";
+		reg = <0x40000000 0x6000>;
+
+		nvmem-cells = <&eth1_addr>;
+		nvmem-cell-names = "address";
+
+		interrupts = <0 29 IRQ_TYPE_LEVEL_HIGH>, <0 30 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "rx", "tx";
+		interrupt-parent = <&intc>;
+
+		phy-mode = "xgmii";
+		phy-handle = <&ethernet_phy1>;
+	};