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diff --git a/Documentation/devicetree/bindings/virtio/mmio.txt b/Documentation/devicetree/bindings/virtio/mmio.txt
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+* virtio memory mapped device
+
+See http://ozlabs.org/~rusty/virtio-spec/ for more details.
+
+Required properties:
+
+- compatible:   "virtio,mmio" compatibility string
+- reg:          control registers base address and size including configuration space
+- interrupts:   interrupt generated by the device
+
+Example:
+
+        virtio_block@3000 {
+                compatible = "virtio,mmio";
+                reg = <0x3000 0x100>;
+                interrupts = <41>;
+        }