[U-Boot] [PATCH 2/4 v3] doc: bindings: Add description for MDIO MUX dts nodes

[Alexandru Marginean <alexandru.marginean@nxp.com>]

Adds a short bindings document describing the expected structure of a MDIO
MUX dts node.  This is based on Linux binding and the example is in fact
copied from there.

Signed-off-by: Alex Marginean <alexm.osslist@gmail.com>
---

Changes in v2:
	- no change
Changes in v3:
	- no change, just fighting with the email server

 doc/device-tree-bindings/net/mdio-mux.txt | 61 +++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 doc/device-tree-bindings/net/mdio-mux.txt

diff --git a/doc/device-tree-bindings/net/mdio-mux.txt b/doc/device-tree-bindings/net/mdio-mux.txt
new file mode 100644
index 0000000000..fdf817fd93
--- /dev/null
+++ b/doc/device-tree-bindings/net/mdio-mux.txt
@@ -0,0 +1,61 @@
+The expected structure of an MDIO MUX device tree node is described here.  This
+is heavily based on current Linux specification.
+The MDIO buses downstream of the MUX should be described in the device tree as
+child nodes as indicated below.
+
+Required properties:
+mdio-parent-bus = a phandle to the MDIO bus used to perform actual I/O.  This is
+                  typically a real MDIO device, unless there are cascaded MUXes.
+#address-cells = <1>, each MDIO group is identified by one 32b value.
+#size-cells = <0>
+
+Other properties:
+The properties described here are sufficient for MDIO MUX DM class code, but
+MUX drivers may define additional properties, either required or optional.
+
+Required properties in child nodes:
+reg = value to be configured on the MUX to select the respective downstream
+      MDIO.
+
+Child nodes should normally contain PHY nodes, referenced by phandle from
+ethernet nodes of the eth interfaces using these PHYs.
+
+Example structure, extracted from Linux bindings document:
+
+	/* The parent MDIO bus. */
+	smi1: mdio at 1180000001900 {
+		compatible = "cavium,octeon-3860-mdio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0x11800 0x00001900 0x0 0x40>;
+	};
+
+	/*
+	   An NXP sn74cbtlv3253 dual 1-of-4 switch controlled by a
+	   pair of GPIO lines.  Child busses 2 and 3 populated with 4
+	   PHYs each.
+	 */
+	mdio-mux {
+		compatible = "mdio-mux-gpio";
+		gpios = <&gpio1 3 0>, <&gpio1 4 0>;
+		mdio-parent-bus = <&smi1>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		mdio at 2 {
+			reg = <2>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			phy11: ethernet-phy at 1 {
+				reg = <1>;
+				marvell,reg-init = <3 0x10 0 0x5777>,
+					<3 0x11 0 0x00aa>,
+					<3 0x12 0 0x4105>,
+					<3 0x13 0 0x0a60>;
+				interrupt-parent = <&gpio>;
+				interrupts = <10 8>; /* Pin 10, active low */
+			};
+		};
+	};
+
-- 
2.17.1