FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/mailbox/mailbox.txt

     * Generic Mailbox Controller and client driver bindings
     
     Generic binding to provide a way for Mailbox controller drivers to
     assign appropriate mailbox channel to client drivers.
     
     * Mailbox Controller
     
     Required property:
     - #mbox-cells: Must be at least 1. Number of cells in a mailbox
                    specifier.
    
    Example:
            mailbox: mailbox {
                    ...
                    #mbox-cells = <1>;
            };
    
    
    * Mailbox Client
    
    Required property:
    - mboxes: List of phandle and mailbox channel specifiers.
    
    Optional property:
    - mbox-names: List of identifier strings for each mailbox channel.
    - shmem : List of phandle pointing to the shared memory(SHM) area between the
              users of these mailboxes for IPC, one for each mailbox. This shared
              memory can be part of any memory reserved for the purpose of this
              communication between the mailbox client and the remote.
    
    
    Example:
            pwr_cntrl: power {
                    ...
                    mbox-names = "pwr-ctrl", "rpc";
                    mboxes = <&mailbox 0 &mailbox 1>;
            };
    
    Example with shared memory(shmem):
    
            sram: sram@50000000 {
                    compatible = "mmio-sram";
                    reg = <0x50000000 0x10000>;
    
                    #address-cells = <1>;
                    #size-cells = <1>;
                    ranges = <0 0x50000000 0x10000>;
    
                    cl_shmem: shmem@0 {
                            compatible = "client-shmem";
                            reg = <0x0 0x200>;
                    };
            };
    
            client@2e000000 {
                    ...
                    mboxes = <&mailbox 0>;
                    shmem = <&cl_shmem>;
                    ..
            };

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