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    Subject[PATCH v3 01/14] dt/bindings: Add bindings for PIC32 interrupt controller
    Date
    From: Cristian Birsan <cristian.birsan@microchip.com>

    Document the devicetree bindings for the interrupt controller on
    Microchip PIC32 class devices.

    Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
    Signed-off-by: Joshua Henderson <joshua.henderson@microchip.com>
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Acked-by: Rob Herring <robh@kernel.org>
    ---
    .../interrupt-controller/microchip,pic32-evic.txt | 58 ++++++++++++++++++++
    1 file changed, 58 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/interrupt-controller/microchip,pic32-evic.txt

    diff --git a/Documentation/devicetree/bindings/interrupt-controller/microchip,pic32-evic.txt b/Documentation/devicetree/bindings/interrupt-controller/microchip,pic32-evic.txt
    new file mode 100644
    index 0000000..6f4389a
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/interrupt-controller/microchip,pic32-evic.txt
    @@ -0,0 +1,58 @@
    +Microchip PIC32 Interrupt Controller
    +====================================
    +
    +The Microchip PIC32 contains an Enhanced Vectored Interrupt Controller
    +(EVIC). It handles internal and external interrupts and provides support for
    +irq type and polarity.
    +
    +Required properties
    +-------------------
    +
    +- compatible: Should be "microchip,pic32mzda-evic"
    +
    +- reg: Specifies physical base address and size of register range.
    +
    +- interrupt-controller: Identifies the node as an interrupt controller.
    +
    +- #interrupt cells: Specifies the number of cells used to encode an interrupt
    +source connected to this controller. The value shall be 2 and interrupt
    +descriptor shall have the following format:
    + <hw_irq irq_type>
    +
    +hw_irq - represents the hardware interrupt number as in the data sheet.
    +
    +irq_type - is used to describe the type and polarity of an interrupt. For
    +internal interrupts use IRQ_TYPE_EDGE_RISING for non persistent interrupts and
    +IRQ_TYPE_LEVEL_HIGH for persistent interrupts. For external interrupts use
    +IRQ_TYPE_EDGE_RISING or IRQ_TYPE_EDGE_FALLING to select the desired polarity.
    +
    +Example
    +-------
    +
    +evic: interrupt-controller@1f810000 {
    + compatible = "microchip,pic32mzda-evic";
    + interrupt-controller;
    + #interrupt-cells = <2>;
    + reg = <0x1f810000 0x1000>;
    +};
    +
    +Each device must request his interrupt line with the associated priority and
    +polarity
    +
    +Internal interrupt DTS snippet
    +------------------------------
    +
    +device@1f800000 {
    + ...
    + interrupts = <113 IRQ_TYPE_LEVEL_HIGH>;
    + ...
    +};
    +
    +External interrupt DTS snippet
    +------------------------------
    +
    +device@1f800000 {
    + ...
    + interrupts = <3 IRQ_TYPE_EDGE_RISING>;
    + ...
    +};
    --
    1.7.9.5
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