Add documentations for macb mdio driver.

Signed-off-by: Harini Katakam <hari...@xilinx.com>
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 .../devicetree/bindings/net/macb-mdio.txt          |   31 ++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/macb-mdio.txt

diff --git a/Documentation/devicetree/bindings/net/macb-mdio.txt 
b/Documentation/devicetree/bindings/net/macb-mdio.txt
new file mode 100644
index 0000000..11c70a3
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/macb-mdio.txt
@@ -0,0 +1,31 @@
+* Cadence MACB MDIO controller
+
+Required properties:
+- compatible: Should be "cdns,macb-mdio"
+- reg: Address and length of the register set of MAC to be used
+- clock-names: Tuple listing input clock names.
+       Required elements: 'pclk', 'hclk'
+       Optional elements: 'tx_clk'
+- clocks: Phandles to input clocks.
+
+Examples:
+
+       mdio {
+               compatible = "cdns,macb-mdio";
+               reg = <0x0 0xff0b0000 0x0 0x1000>;
+               clocks = <&clk125>, <&clk125>, <&clk125>;
+               clock-names = "pclk", "hclk", "tx_clk";
+               ethernet_phyC: ethernet-phy@C {
+                       reg = <C>;
+               };
+               ethernet_phy7: ethernet-phy@7 {
+                       reg = <7>;
+               };
+               ethernet_phy3: ethernet-phy@3 {
+                       reg = <3>;
+               };
+               ethernet_phy8: ethernet-phy@8 {
+                       reg = <8>;
+               };
+       };
+
-- 
1.7.9.5

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