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[Xen-devel] [PATCH v3] devicetree, xen: add xen, shared-memory binding

From: Stefano Stabellini <stefanos@xxxxxxxxxx>

Introduce a device tree binding for Xen reserved-memory regions. They
are used to share memory across VMs from the VM config files. (See
static_shm config option.)

Signed-off-by: Stefano Stabellini <stefanos@xxxxxxxxxx>
Cc: julien.grall@xxxxxxx
Changes in v3:
- remove fallback version

Changes in v2:
- fix Author line
- add versioning
- xen,id instead of id
 .../bindings/reserved-memory/xen,shared-memory.txt   | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 

diff --git 
new file mode 100644
index 0000000..7c81683
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/xen,shared-memory.txt
@@ -0,0 +1,20 @@
+* Xen hypervisor reserved-memory binding
+Expose one or more memory regions as reserved-memory to the guest
+virtual machine. Typically, a region is configured at VM creation time
+to be a shared memory area across multiple virtual machines for
+communication among them.
+For each of these pre-shared memory regions, a range is exposed under
+the /reserved-memory node as a child node. Each range sub-node is named
+xen-shmem@<address> and has the following properties:
+- compatible:
+       compatible = "xen,shared-memory-v1"
+- reg:
+       the base guest physical address and size of the shared memory region
+- xen,id:
+       a string that identifies the shared memory region as specified in
+       the VM config file

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