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+Hisilicon Hi3660 Mailbox Controller
+
+Hisilicon Hi3660 mailbox controller supports up to 32 channels. Messages
+are passed between processors, including application & communication
+processors, MCU, HIFI, etc. Each channel is unidirectional and accessed
+by using MMIO registers; it supports maximum to 8 words message.
+
+Controller
+----------
+
+Required properties:
+- compatible: : Shall be "hisilicon,hi3660-mbox"
+- reg: : Offset and length of the device's register set
+- #mbox-cells: : Must be 3
+ <&phandle channel dst_irq ack_irq>
+ phandle : Label name of controller
+ channel : Channel number
+ dst_irq : Remote interrupt vector
+ ack_irq : Local interrupt vector
+
+- interrupts: : Contains the two IRQ lines for mailbox.
+
+Example:
+
+mailbox: mailbox@e896b000 {
+ compatible = "hisilicon,hi3660-mbox";
+ reg = <0x0 0xe896b000 0x0 0x1000>;
+ interrupts = <0x0 0xc0 0x4>,
+ <0x0 0xc1 0x4>;
+ #mbox-cells = <3>;
+};
+
+Client
+------
+
+Required properties:
+- compatible : See the client docs
+- mboxes : Standard property to specify a Mailbox (See ./mailbox.txt)
+ Cells must match 'mbox-cells' (See Controller docs above)
+
+Optional properties
+- mbox-names : Name given to channels seen in the 'mboxes' property.
+
+Example:
+
+stub_clock: stub_clock@e896b500 {
+ compatible = "hisilicon,hi3660-stub-clk";
+ reg = <0x0 0xe896b500 0x0 0x0100>;
+ #clock-cells = <1>;
+ mboxes = <&mailbox 13 3 0>;
+};