Hisilicon Hi6220 Mailbox Driver
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===============================
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Hisilicon Hi6220 mailbox supports up to 32 channels. Each channel
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is unidirectional with a maximum message size of 8 words. I/O is
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performed using register access (there is no DMA) and the cell
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raises an interrupt when messages are received.
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Mailbox Device Node:
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====================
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Required properties:
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--------------------
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- compatible: Shall be "hisilicon,hi6220-mbox"
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- reg: Contains the mailbox register address range (base
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address and length); the first item is for IPC
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registers, the second item is shared buffer for
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slots.
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- #mbox-cells: Common mailbox binding property to identify the number
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of cells required for the mailbox specifier. Must be 3.
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<&phandle slot_id dst_irq ack_irq>
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phandle: Label name of mailbox controller
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slot_id: Slot id used either for TX or RX
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dst_irq: IRQ identifier index number which used by MCU
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ack_irq: IRQ identifier index number with generating a
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TX/RX interrupt to application processor,
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mailbox driver uses it to acknowledge interrupt
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- interrupts: Contains the interrupt information for the mailbox
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device. The format is dependent on which interrupt
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controller the SoCs use.
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Optional Properties:
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--------------------
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- hi6220,mbox-tx-noirq: Property of MCU firmware's feature, so mailbox driver
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use this flag to ask MCU to enable "automatic idle
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flag" mode or IRQ generated mode to acknowledge a TX
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completion.
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Example:
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--------
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mailbox: mailbox@f7510000 {
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compatible = "hisilicon,hi6220-mbox";
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reg = <0x0 0xf7510000 0x0 0x1000>, /* IPC_S */
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<0x0 0x06dff800 0x0 0x0800>; /* Mailbox */
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interrupt-parent = <&gic>;
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interrupts = <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>;
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#mbox-cells = <3>;
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};
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Mailbox client
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===============
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Required properties:
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--------------------
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- compatible: Many (See the client docs).
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- mboxes: Standard property to specify a Mailbox (See ./mailbox.txt)
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Cells must match 'mbox-cells' (See Mailbox Device Node above).
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Optional Properties:
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--------------------
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- mbox-names: Name given to channels seen in the 'mboxes' property.
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Example:
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--------
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stub_clock: stub_clock {
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compatible = "hisilicon,hi6220-stub-clk";
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hisilicon,hi6220-clk-sram = <&sram>;
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#clock-cells = <1>;
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mbox-names = "mbox-tx", "mbox-rx";
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mboxes = <&mailbox 1 0 11>, <&mailbox 0 1 10>;
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};
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