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    Subject[PATCH v3 1/2] dt-bindings: gpio: Binding for Realtek Otto GPIO
    Date
    Add a binding description for Realtek's GPIO controller found on several
    of their MIPS-based SoCs (codenamed Otto), such as the RTL838x and
    RTL839x series of switch SoCs.

    A fallback binding 'realtek,otto-gpio' is provided for cases where the
    actual port ordering is not known yet, and enabling the interrupt
    controller may result in uncaught interrupts.

    Signed-off-by: Sander Vanheule <sander@svanheule.net>
    Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
    ---
    .../bindings/gpio/realtek,otto-gpio.yaml | 78 +++++++++++++++++++
    1 file changed, 78 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml

    diff --git a/Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml b/Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml
    new file mode 100644
    index 000000000000..100f20cebd76
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/gpio/realtek,otto-gpio.yaml
    @@ -0,0 +1,78 @@
    +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
    +%YAML 1.2
    +---
    +$id: http://devicetree.org/schemas/gpio/realtek,otto-gpio.yaml#
    +$schema: http://devicetree.org/meta-schemas/core.yaml#
    +
    +title: Realtek Otto GPIO controller
    +
    +maintainers:
    + - Sander Vanheule <sander@svanheule.net>
    + - Bert Vermeulen <bert@biot.com>
    +
    +description: |
    + Realtek's GPIO controller on their MIPS switch SoCs (Otto platform) consists
    + of two banks of 32 GPIOs. These GPIOs can generate edge-triggered interrupts.
    + Each bank's interrupts are cascased into one interrupt line on the parent
    + interrupt controller, if provided.
    + This binding allows defining a single bank in the devicetree. The interrupt
    + controller is not supported on the fallback compatible name, which only
    + allows for GPIO port use.
    +
    +properties:
    + $nodename:
    + pattern: "^gpio@[0-9a-f]+$"
    +
    + compatible:
    + items:
    + - enum:
    + - realtek,rtl8380-gpio
    + - realtek,rtl8390-gpio
    + - const: realtek,otto-gpio
    +
    + reg:
    + maxItems: 1
    +
    + "#gpio-cells":
    + const: 2
    +
    + gpio-controller: true
    +
    + ngpios:
    + minimum: 1
    + maximum: 32
    +
    + interrupt-controller: true
    +
    + "#interrupt-cells":
    + const: 2
    +
    + interrupts:
    + maxItems: 1
    +
    +required:
    + - compatible
    + - reg
    + - "#gpio-cells"
    + - gpio-controller
    +
    +additionalProperties: false
    +
    +dependencies:
    + interrupt-controller: [ interrupts ]
    +
    +examples:
    + - |
    + gpio@3500 {
    + compatible = "realtek,rtl8380-gpio", "realtek,otto-gpio";
    + reg = <0x3500 0x1c>;
    + gpio-controller;
    + #gpio-cells = <2>;
    + ngpios = <24>;
    + interrupt-controller;
    + #interrupt-cells = <2>;
    + interrupt-parent = <&rtlintc>;
    + interrupts = <23>;
    + };
    +
    +...
    --
    2.30.2
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