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    Subject[PATCH v10 9/9] dt-bindings: gpio: Add bindings for Cadence I3C gpio expander
    Date
    Document the Cadence I3C gpio expander bindings.

    Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
    Reviewed-by: Rob Herring <robh@kernel.org>
    Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
    ---
    Changes in v10:
    - None

    Changes in v9:
    - Add Linus R-b

    Changes in v8:
    - None

    Changes in v7:
    - None

    Changes in v6:
    - None

    Changes in v5:
    - Add Rob's R-b

    Changes in v4:
    - Use GPIO_ and IRQ_TYPE_ macros instead of raw numbers
    - Fix the unit-address in the example
    ---
    .../bindings/gpio/gpio-cdns-i3c.txt | 39 +++++++++++++++++++
    1 file changed, 39 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt

    diff --git a/Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt b/Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt
    new file mode 100644
    index 000000000000..d0155a9cea79
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt
    @@ -0,0 +1,39 @@
    +* Cadence I3C GPIO expander
    +
    +The Cadence I3C GPIO expander provides 8 GPIOs controllable over I3C.
    +This GPIOs can be configured in output or input mode and if they are in input
    +mode they can generate IBIs (In Band Interrupts).
    +
    +Required properties for GPIO node:
    +- reg : 3 cells encoding the I3C static address (none in our case) and the I3C
    + Provisional ID. See Documentation/devicetree/bindings/i3c/i3c.txt for
    + more details.
    + Should be <0x0 0x392 0x0>.
    +- gpio-controller : Marks the device node as a gpio controller.
    +- #gpio-cells : Should be two. The first cell is the pin number and
    + the second cell is used to specify the gpio polarity (GPIO_ACTIVE_HIGH or
    + GPIO_ACTIVE_LOW)
    +- interrupt-controller: Marks the device node as an interrupt controller.
    +- #interrupt-cells : Should be 2. The first cell is the GPIO number.
    + The second cell is used to specify trigger type and level flags.
    + The following trigger types are accepted (see
    + <dt-bindings/interrupt-controller/irq.h> for their definition):
    + IRQ_TYPE_EDGE_RISING
    + IRQ_TYPE_EDGE_FALLING
    + IRQ_TYPE_EDGE_BOTH
    + IRQ_TYPE_LEVEL_HIGH
    + IRQ_TYPE_LEVEL_LOW
    +
    +Example:
    +
    + i3c-master@xxx {
    + ...
    + i3c_gpio_expander: gpio@0,39200000000 {
    + reg = <0 0x392 0x0>;
    + gpio-controller;
    + #gpio-cells = <2>;
    + interrupt-controller;
    + #interrupt-cells = <2>;
    + };
    + ...
    + };
    --
    2.17.1
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