Commit 1f3c0760 authored by Linus Walleij's avatar Linus Walleij Committed by Bartosz Golaszewski
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dt-bindings: gpio-mmio: Add MMIO for IXP4xx expansion bus 



This expansion is a simple MMIO-mapped GPIO device but the bus has a
number of additional properties that we need to bring in using
a reference to the bus child node schema.

Reviewed-by: default avatarRob Herring (Arm) <robh@kernel.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250822-ixp4xx-eb-mmio-gpio-v2-2-bd2edd4a9c74@linaro.org


Signed-off-by: default avatarBartosz Golaszewski <bartosz.golaszewski@linaro.org>
parent 545908a9

Documentation/devicetree/bindings/gpio/gpio-mmio.yaml

+29 −1
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ properties: 
      - brcm,bcm6345-gpio

      - ni,169445-nand-gpio

      - wd,mbl-gpio # Western Digital MyBook Live memory-mapped GPIO controller

      - intel,ixp4xx-expansion-bus-mmio-gpio



  big-endian: true
@@ -89,6 +90,14 @@ properties: 
    description:

      If this property is present, the controller cannot drive the GPIO lines.



if:

  properties:

    compatible:

      contains:

        const: intel,ixp4xx-expansion-bus-mmio-gpio

then:

  $ref: /schemas/memory-controllers/intel,ixp4xx-expansion-peripheral-props.yaml#



patternProperties:

  "^.+-hog(-[0-9]+)?$":

    type: object
@@ -102,7 +111,7 @@ required: 
  - '#gpio-cells'

  - gpio-controller



additionalProperties: false

unevaluatedProperties: false



examples:

  - |
@@ -132,3 +141,22 @@ examples: 
      gpio-controller;

      #gpio-cells = <2>;

    };



    bus@c4000000 {

        compatible = "intel,ixp42x-expansion-bus-controller", "syscon";

        reg = <0xc4000000 0x30>;

        native-endian;

        #address-cells = <2>;

        #size-cells = <1>;

        ranges = <0 0x0 0x50000000 0x01000000>;

        dma-ranges = <0 0x0 0x50000000 0x01000000>;

        gpio@1,0 {

            compatible = "intel,ixp4xx-expansion-bus-mmio-gpio";

            gpio-controller;

            #gpio-cells = <2>;

            big-endian;

            reg = <1 0x00000000 0x2>;

            reg-names = "dat";

            intel,ixp4xx-eb-write-enable = <1>;

        };

    };