Unverified Commit 079a015b authored by Danny Kaehn's avatar Danny Kaehn Committed by Andi Shyti
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dt-bindings: i2c: Add CP2112 HID USB to SMBus Bridge 



This is a USB HID device which includes an I2C controller and 8 GPIO pins.

The binding allows describing the chip's gpio and i2c controller in DT,
with the i2c controller being bound to a subnode named "i2c". This is
intended to be used in configurations where the CP2112 is permanently
connected in hardware.

Signed-off-by: default avatarDanny Kaehn <danny.kaehn@plexus.com>
Reviewed-by: default avatarRob Herring (Arm) <robh@kernel.org>
Signed-off-by: default avatarAndi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260127-cp2112-dt-v13-1-6448ddd4bf22@plexus.com
parent 76b70625

Documentation/devicetree/bindings/i2c/silabs,cp2112.yaml

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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/i2c/silabs,cp2112.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#



title: CP2112 HID USB to SMBus/I2C Bridge



maintainers:

  - Danny Kaehn <danny.kaehn@plexus.com>



description:

  The CP2112 is a USB HID device which includes an integrated I2C controller

  and 8 GPIO pins. Its GPIO pins can each be configured as inputs, open-drain

  outputs, or push-pull outputs.



properties:

  compatible:

    const: usb10c4,ea90



  reg:

    maxItems: 1

    description: The USB port number



  interrupt-controller: true

  "#interrupt-cells":

    const: 2



  gpio-controller: true

  "#gpio-cells":

    const: 2



  gpio-line-names:

    minItems: 1

    maxItems: 8



  i2c:

    description: The SMBus/I2C controller node for the CP2112

    $ref: /schemas/i2c/i2c-controller.yaml#

    unevaluatedProperties: false



    properties:

      clock-frequency:

        minimum: 10000

        default: 100000

        maximum: 400000



patternProperties:

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

    type: object



    required:

      - gpio-hog



required:

  - compatible

  - reg



additionalProperties: false



examples:

  - |

    #include <dt-bindings/interrupt-controller/irq.h>

    #include <dt-bindings/gpio/gpio.h>



    usb {

        #address-cells = <1>;

        #size-cells = <0>;



        cp2112: device@1 {

            compatible = "usb10c4,ea90";

            reg = <1>;



            gpio-controller;

            interrupt-controller;

            #interrupt-cells = <2>;

            #gpio-cells = <2>;

            gpio-line-names = "CP2112_SDA", "CP2112_SCL", "TEST2",

                              "TEST3","TEST4", "TEST5", "TEST6";



            fan-rst-hog {

                gpio-hog;

                gpios = <7 GPIO_ACTIVE_HIGH>;

                output-high;

                line-name = "FAN_RST";

            };



            i2c {

                #address-cells = <1>;

                #size-cells = <0>;

                sda-gpios = <&cp2112 0 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;

                scl-gpios = <&cp2112 1 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;



                temp@48 {

                    compatible = "national,lm75";

                    reg = <0x48>;

                };

            };

        };

    };