hisilicon,hi6220-mailbox.txt

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    1 Hisilicon Hi6220 Mailbox Driver
    2 ===============================
    3 
    4 Hisilicon Hi6220 mailbox supports up to 32 channels. Each channel
    5 is unidirectional with a maximum message size of 8 words. I/O is
    6 performed using register access (there is no DMA) and the cell
    7 raises an interrupt when messages are received.
    8 
    9 Mailbox Device Node:
   10 ====================
   11 
   12 Required properties:
   13 --------------------
   14 - compatible:           Shall be "hisilicon,hi6220-mbox"
   15 - reg:                  Contains the mailbox register address range (base
   16                         address and length); the first item is for IPC
   17                         registers, the second item is shared buffer for
   18                         slots.
   19 - #mbox-cells:          Common mailbox binding property to identify the number
   20                         of cells required for the mailbox specifier. Must be 3.
   21                         <&phandle slot_id dst_irq ack_irq>
   22                           phandle: Label name of mailbox controller
   23                           slot_id: Slot id used either for TX or RX
   24                           dst_irq: IRQ identifier index number which used by MCU
   25                           ack_irq: IRQ identifier index number with generating a
   26                                    TX/RX interrupt to application processor,
   27                                    mailbox driver uses it to acknowledge interrupt
   28 - interrupts:           Contains the interrupt information for the mailbox
   29                         device. The format is dependent on which interrupt
   30                         controller the SoCs use.
   31 
   32 Optional Properties:
   33 --------------------
   34 - hi6220,mbox-tx-noirq: Property of MCU firmware's feature, so mailbox driver
   35                         use this flag to ask MCU to enable "automatic idle
   36                         flag" mode or IRQ generated mode to acknowledge a TX
   37                         completion.
   38 
   39 Example:
   40 --------
   41 
   42         mailbox: mailbox@f7510000 {
   43                 compatible = "hisilicon,hi6220-mbox";
   44                 reg = <0x0 0xf7510000 0x0 0x1000>, /* IPC_S */
   45                       <0x0 0x06dff800 0x0 0x0800>; /* Mailbox */
   46                 interrupt-parent = <&gic>;
   47                 interrupts = <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>;
   48                 #mbox-cells = <3>;
   49         };
   50 
   51 
   52 Mailbox client
   53 ===============
   54 
   55 Required properties:
   56 --------------------
   57 - compatible:           Many (See the client docs).
   58 - mboxes:               Standard property to specify a Mailbox (See ./mailbox.txt)
   59                         Cells must match 'mbox-cells' (See Mailbox Device Node above).
   60 
   61 Optional Properties:
   62 --------------------
   63 - mbox-names:           Name given to channels seen in the 'mboxes' property.
   64 
   65 Example:
   66 --------
   67 
   68         stub_clock: stub_clock {
   69                 compatible = "hisilicon,hi6220-stub-clk";
   70                 hisilicon,hi6220-clk-sram = <&sram>;
   71                 #clock-cells = <1>;
   72                 mbox-names = "mbox-tx", "mbox-rx";
   73                 mboxes = <&mailbox 1 0 11>, <&mailbox 0 1 10>;
   74         };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/mailbox/hisilicon,hi6220-mailbox.txt

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sys/contrib/device-tree/Bindings/mailbox/hisilicon,hi6220-mailbox.txt