Documentation/devicetree/bindings/mailbox/sti-mailbox.txt

   1 ST Microelectronics Mailbox Driver
   2
   3 Each ST Mailbox IP currently consists of 4 instances of 32 channels.  Messages
   4 are passed between Application and Remote processors using shared memory.
   5
   6 Controller
   7 ----------
   8
   9 Required properties:
  10 - compatible            : Should be "st,stih407-mailbox"
  11 - reg                   : Offset and length of the device's register set
  12 - mbox-name             : Name of the mailbox
  13 - #mbox-cells:          : Must be 2
  14                           <&phandle instance channel direction>
  15                             phandle   : Label name of controller
  16                             instance  : Instance number
  17                             channel   : Channel number
  18
  19 Optional properties
  20 - interrupts            : Contains the IRQ line for a Rx mailbox
  21
  22 Example:
  23
  24 mailbox0: mailbox@0  {
  25         compatible      = "st,stih407-mailbox";
  26         reg             = <0x08f00000 0x1000>;
  27         interrupts      = <GIC_SPI 1 IRQ_TYPE_NONE>;
  28         #mbox-cells     = <2>;
  29         mbox-name       = "a9";
  30 };
  31
  32 Client
  33 ------
  34
  35 Required properties:
  36 - compatible            : Many (See the client docs)
  37 - reg                   : Shared (between Application and Remote) memory address
  38 - mboxes                : Standard property to specify a Mailbox (See ./mailbox.txt)
  39                           Cells must match 'mbox-cells' (See Controller docs above)
  40
  41 Optional properties
  42 - mbox-names            : Name given to channels seen in the 'mboxes' property.
  43
  44 Example:
  45
  46 mailbox_test {
  47         compatible      = "mailbox-test";
  48         reg             = <0x[shared_memory_address], [shared_memory_size]>;
  49         mboxes          = <&mailbox2 0 1>, <&mailbox0 2 1>;
  50         mbox-names      = "tx", "rx";
  51 };