1* Generic Mailbox Controller and client driver bindings 2 3Generic binding to provide a way for Mailbox controller drivers to 4assign appropriate mailbox channel to client drivers. 5 6* Mailbox Controller 7 8Required property: 9- #mbox-cells: Must be at least 1. Number of cells in a mailbox 10 specifier. 11 12Example: 13 mailbox: mailbox { 14 ... 15 #mbox-cells = <1>; 16 }; 17 18 19* Mailbox Client 20 21Required property: 22- mboxes: List of phandle and mailbox channel specifiers. 23 24Optional property: 25- mbox-names: List of identifier strings for each mailbox channel. 26- shmem : List of phandle pointing to the shared memory(SHM) area between the 27 users of these mailboxes for IPC, one for each mailbox. This shared 28 memory can be part of any memory reserved for the purpose of this 29 communication between the mailbox client and the remote. 30 31 32Example: 33 pwr_cntrl: power { 34 ... 35 mbox-names = "pwr-ctrl", "rpc"; 36 mboxes = <&mailbox 0 &mailbox 1>; 37 }; 38 39Example with shared memory(shmem): 40 41 sram: sram@50000000 { 42 compatible = "mmio-sram"; 43 reg = <0x50000000 0x10000>; 44 45 #address-cells = <1>; 46 #size-cells = <1>; 47 ranges = <0 0x50000000 0x10000>; 48 49 cl_shmem: shmem@0 { 50 compatible = "client-shmem"; 51 reg = <0x0 0x200>; 52 }; 53 }; 54 55 client@2e000000 { 56 ... 57 mboxes = <&mailbox 0>; 58 shmem = <&cl_shmem>; 59 .. 60 }; 61