docs: Xen ARM DT bindings

Add a doc to describe the Xen ARM device tree bindings

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
CC: devicetree-discuss@lists.ozlabs.org
CC: David Vrabel <david.vrabel@citrix.com>

diff --git a/Documentation/devicetree/bindings/arm/xen.txt b/Documentation/devicetree/bindings/arm/xen.txt
new file mode 100644 (file)
index 0000000..ec6d884
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+++ b/Documentation/devicetree/bindings/arm/xen.txt
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+* Xen hypervisor device tree bindings
+
+Xen ARM virtual platforms shall have the following properties:
+
+- compatible:
+       compatible = "xen,xen", "xen,xen-<version>";
+  where <version> is the version of the Xen ABI of the platform.
+
+- reg: specifies the base physical address and size of a region in
+  memory where the grant table should be mapped to, using an
+  HYPERVISOR_memory_op hypercall. 
+
+- interrupts: the interrupt used by Xen to inject event notifications.
+
+
+Example:
+
+hypervisor {
+       compatible = "xen,xen", "xen,xen-4.3";
+       reg = <0xb0000000 0x20000>;
+       interrupts = <1 15 0xf08>;
+};