arm-mhu.txt

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    1 ARM MHU Mailbox Driver
    2 ======================
    3 
    4 The ARM's Message-Handling-Unit (MHU) is a mailbox controller that has
    5 3 independent channels/links to communicate with remote processor(s).
    6  MHU links are hardwired on a platform. A link raises interrupt for any
    7 received data. However, there is no specified way of knowing if the sent
    8 data has been read by the remote. This driver assumes the sender polls
    9 STAT register and the remote clears it after having read the data.
   10 The last channel is specified to be a 'Secure' resource, hence can't be
   11 used by Linux running NS.
   12 
   13 Mailbox Device Node:
   14 ====================
   15 
   16 Required properties:
   17 --------------------
   18 - compatible:           Shall be "arm,mhu" & "arm,primecell"
   19 - reg:                  Contains the mailbox register address range (base
   20                         address and length)
   21 - #mbox-cells           Shall be 1 - the index of the channel needed.
   22 - interrupts:           Contains the interrupt information corresponding to
   23                         each of the 3 links of MHU.
   24 
   25 Example:
   26 --------
   27 
   28         mhu: mailbox@2b1f0000 {
   29                 #mbox-cells = <1>;
   30                 compatible = "arm,mhu", "arm,primecell";
   31                 reg = <0 0x2b1f0000 0x1000>;
   32                 interrupts = <0 36 4>, /* LP-NonSecure */
   33                              <0 35 4>, /* HP-NonSecure */
   34                              <0 37 4>; /* Secure */
   35                 clocks = <&clock 0 2 1>;
   36                 clock-names = "apb_pclk";
   37         };
   38 
   39         mhu_client: scb@2e000000 {
   40                 compatible = "fujitsu,mb86s70-scb-1.0";
   41                 reg = <0 0x2e000000 0x4000>;
   42                 mboxes = <&mhu 1>; /* HP-NonSecure */
   43         };

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

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sys/contrib/device-tree/Bindings/mailbox/arm-mhu.txt