On Fri, Mar 01, 2019 at 10:29:47PM -0600, Samuel Holland wrote:
> This is a somewhat generic binding for an interrupt controller/forwarder
> implemented in firmware and communicated with using a mailbox.
>
> Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>
> ---
> .../interrupt-controller/mbox-intc.txt | 33 +++++++++++++++++++
> 1 file changed, 33 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/interrupt-controller/mbox-intc.txt
>
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/mbox-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/mbox-intc.txt
> new file mode 100644
> index 000000000000..a0eb7904ca83
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/mbox-intc.txt
> @@ -0,0 +1,33 @@
> +Mailbox-backed Interrupt Controller
> +===================================
Probably never really going to be generic as every mailbox protocol is
different.
> +
> +This binding represents an interrupt controller implemented in firmware,
> +that uses a mailbox channel to signal and acknowledge interrupts.
> +
> +Device Node:
> +============
> +
> +Required properties:
> +--------------------
> +- compatible: Must be one of the following strings:
> + - allwinner,sunxi-msgbox-intc
> +- interrupt-controller: Signifies that this node is an interrupt controller.
> +- #interrupt-cells: Must be 1.
No edge/level control?
> +- mboxes: phandle for the mailbox controller and channel
> + specifier. If the mailbox controller has unidirectional
> + channels, two entries are required (see below).
> +- mbox-names: Only required for unidirectional mailbox channels. In
> + that case, it must contain the strings "tx" and "rx"
> + (where "tx" and "rx" are from Linux's perspective, not
/Linux/the OS/
> + the direction the interrupts are traveling).
> +
> +Example:
> +--------
> +
> + msgbox_intc: interrupt-controller {
> + compatible = "allwinner,sunxi-msgbox-intc";
> + interrupt-controller;
> + #interrupt-cells = <1>;
> + mboxes = <&msgbox 6>, <&msgbox 7>;
> + mbox-names = "tx", "rx";
> + };
> --
> 2.19.2
>
