doc: dt: add documentation for nxp,lpc1850-dwmac

Add device tree binding documentation for nxp,lpc1850-dwmac.

Signed-off-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/devicetree/bindings/net/nxp,lpc1850-dwmac.txt b/Documentation/devicetree/bindings/net/nxp,lpc1850-dwmac.txt
new file mode 100644 (file)
index 0000000..7edba12
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/nxp,lpc1850-dwmac.txt
@@ -0,0 +1,20 @@
+* NXP LPC1850 GMAC ethernet controller
+
+This device is a platform glue layer for stmmac.
+Please see stmmac.txt for the other unchanged properties.
+
+Required properties:
+ - compatible:  Should contain "nxp,lpc1850-dwmac"
+
+Examples:
+
+mac: ethernet@40010000 {
+       compatible = "nxp,lpc1850-dwmac", "snps,dwmac-3.611", "snps,dwmac";
+       reg = <0x40010000 0x2000>;
+       interrupts = <5>;
+       interrupt-names = "macirq";
+       clocks = <&ccu1 CLK_CPU_ETHERNET>;
+       clock-names = "stmmaceth";
+       resets = <&rgu 22>;
+       reset-names = "stmmaceth";
+}