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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: Danny Kaehn <danny.kaehn@plexus.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260127-cp2112-dt-v13-1-6448ddd4bf22@plexus.com

authored by

Danny Kaehn and committed by
Andi Shyti 079a015b 76b70625

+100
+100
Documentation/devicetree/bindings/i2c/silabs,cp2112.yaml
··· 1 + # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 + %YAML 1.2 3 + --- 4 + $id: http://devicetree.org/schemas/i2c/silabs,cp2112.yaml# 5 + $schema: http://devicetree.org/meta-schemas/core.yaml# 6 + 7 + title: CP2112 HID USB to SMBus/I2C Bridge 8 + 9 + maintainers: 10 + - Danny Kaehn <danny.kaehn@plexus.com> 11 + 12 + description: 13 + The CP2112 is a USB HID device which includes an integrated I2C controller 14 + and 8 GPIO pins. Its GPIO pins can each be configured as inputs, open-drain 15 + outputs, or push-pull outputs. 16 + 17 + properties: 18 + compatible: 19 + const: usb10c4,ea90 20 + 21 + reg: 22 + maxItems: 1 23 + description: The USB port number 24 + 25 + interrupt-controller: true 26 + "#interrupt-cells": 27 + const: 2 28 + 29 + gpio-controller: true 30 + "#gpio-cells": 31 + const: 2 32 + 33 + gpio-line-names: 34 + minItems: 1 35 + maxItems: 8 36 + 37 + i2c: 38 + description: The SMBus/I2C controller node for the CP2112 39 + $ref: /schemas/i2c/i2c-controller.yaml# 40 + unevaluatedProperties: false 41 + 42 + properties: 43 + clock-frequency: 44 + minimum: 10000 45 + default: 100000 46 + maximum: 400000 47 + 48 + patternProperties: 49 + "-hog(-[0-9]+)?$": 50 + type: object 51 + 52 + required: 53 + - gpio-hog 54 + 55 + required: 56 + - compatible 57 + - reg 58 + 59 + additionalProperties: false 60 + 61 + examples: 62 + - | 63 + #include <dt-bindings/interrupt-controller/irq.h> 64 + #include <dt-bindings/gpio/gpio.h> 65 + 66 + usb { 67 + #address-cells = <1>; 68 + #size-cells = <0>; 69 + 70 + cp2112: device@1 { 71 + compatible = "usb10c4,ea90"; 72 + reg = <1>; 73 + 74 + gpio-controller; 75 + interrupt-controller; 76 + #interrupt-cells = <2>; 77 + #gpio-cells = <2>; 78 + gpio-line-names = "CP2112_SDA", "CP2112_SCL", "TEST2", 79 + "TEST3","TEST4", "TEST5", "TEST6"; 80 + 81 + fan-rst-hog { 82 + gpio-hog; 83 + gpios = <7 GPIO_ACTIVE_HIGH>; 84 + output-high; 85 + line-name = "FAN_RST"; 86 + }; 87 + 88 + i2c { 89 + #address-cells = <1>; 90 + #size-cells = <0>; 91 + sda-gpios = <&cp2112 0 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>; 92 + scl-gpios = <&cp2112 1 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>; 93 + 94 + temp@48 { 95 + compatible = "national,lm75"; 96 + reg = <0x48>; 97 + }; 98 + }; 99 + }; 100 + };