Documentation/devicetree/bindings/mailbox/meson-mhu.txt

   1 Amlogic Meson MHU Mailbox Driver
   2 ================================
   3
   4 The Amlogic's Meson SoCs Message-Handling-Unit (MHU) is a mailbox controller
   5 that has 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
  11 Mailbox Device Node:
  12 ====================
  13
  14 Required properties:
  15 --------------------
  16 - compatible:           Shall be "amlogic,meson-gxbb-mhu"
  17 - reg:                  Contains the mailbox register address range (base
  18                         address and length)
  19 - #mbox-cells           Shall be 1 - the index of the channel needed.
  20 - interrupts:           Contains the interrupt information corresponding to
  21                         each of the 2 links of MHU.
  22
  23 Example:
  24 --------
  25
  26         mailbox: mailbox@c883c404 {
  27                 #mbox-cells = <1>;
  28                 compatible = "amlogic,meson-gxbb-mhu";
  29                 reg = <0 0xc883c404 0 0x4c>;
  30                 interrupts = <0 208 IRQ_TYPE_EDGE_RISING>,
  31                              <0 209 IRQ_TYPE_EDGE_RISING>,
  32                              <0 210 IRQ_TYPE_EDGE_RISING>;
  33                 #mbox-cells = <1>;
  34         };