[RFC 2/6] mailbox: document bindings

[Courtney Cavin <courtney.cavin@sonymobile.com>]

Signed-off-by: Courtney Cavin <courtney.cavin@sonymobile.com>
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 .../devicetree/bindings/mailbox/mailbox.txt        | 44 ++++++++++++++++++++++
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+Binding documentation for mailbox providers and consumers
+--
+
+Mailbox providers may be represented by any node in a device tree.  These
+nodes are designated as mailbox providers.  Consumers can then use a phandle
+to a mailbox provider, along with channel specifier information in order to
+get a mailbox.
+
+MAILBOX PROVIDERS
+
+#mbox-cells:
+	Usage: required
+	Type: u32
+	Desc: Number of cells in a mailbox specifier; Typically 1 for nodes
+	      which only need a channel index.
+
+
+Example:
+	mailbox: mailbox {
+		#mbox-cells = <1>;
+		...
+	};
+
+
+MAILBOX CONSUMERS
+
+mbox:
+	Usage: required
+	Type: < [phandle] [mailbox-specifier] >
+	Desc: List of phandle and mailbox specifier pairs, matching provider's
+	      #mbox-cells property
+
+mbox-names:
+	Usage: optional
+	Type: string array
+	Desc: List of mailbox input name strings sorted in the same order as
+	      the mbox property.  Consumer drivers should use mbox-names
+	      to match mailbox input names with mailbox specifiers.
+
+Example:
+	consumer {
+		mbox-names = "comms";
+		mbox = <&mailbox 0>;
+	};
-- 
1.8.1.5