xref: /openbmc/linux/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml (revision d69c6ddd)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/proximity/semtech,sx9310.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Semtech's SX9310 capacitive proximity sensor

maintainers:
  - Daniel Campello <campello@chromium.org>

description: |
  Semtech's SX9310/SX9311 capacitive proximity/button solution.

  Specifications about the devices can be found at:
  https://www.semtech.com/products/smart-sensing/sar-sensors/sx9310

properties:
  compatible:
    enum:
      - semtech,sx9310
      - semtech,sx9311

  reg:
    maxItems: 1

  interrupts:
    description:
      The sole interrupt generated by the device used to announce the
      preceding reading request has finished and that data is
      available or that a close/far proximity event has happened.
    maxItems: 1

  vdd-supply:
    description: Main power supply

  svdd-supply:
    description: Host interface power supply

  "#io-channel-cells":
    const: 1

  semtech,cs0-ground:
    description: Indicates the CS0 sensor is connected to ground.
    type: boolean

  semtech,combined-sensors:
    $ref: /schemas/types.yaml#/definitions/uint32-array
    description: |
      List of which sensors are combined and represented by CS3.
      Possible values are -
      3        - CS3 (internal)
      0 1      - CS0 + CS1
      1 2      - CS1 + CS2 (default)
      0 1 2 3  - CS0 + CS1 + CS2 + CS3
    items:
      enum: [ 0, 1, 2, 3 ]
    minItems: 1
    maxItems: 4

  semtech,resolution:
    description:
      Capacitance measure resolution. Refer to datasheet for more details.
    enum:
      - coarsest
      - very-coarse
      - coarse
      - medium-coarse
      - medium
      - fine
      - very-fine
      - finest

  semtech,startup-sensor:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2, 3]
    default: 0
    description:
      Sensor used for start-up proximity detection. The combined
      sensor is represented by the value 3. This is used for initial
      compensation.

  semtech,proxraw-strength:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 2, 4, 8]
    default: 2
    description:
      PROXRAW filter strength. A value of 0 represents off, and other values
      represent 1-1/N.

  semtech,avg-pos-strength:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 16, 64, 128, 256, 512, 1024, 4294967295]
    default: 16
    description:
      Average positive filter strength. A value of 0 represents off and
      UINT_MAX (4294967295) represents infinite. Other values
      represent 1-1/N.

required:
  - compatible
  - reg
  - "#io-channel-cells"

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/irq.h>
    i2c {
      #address-cells = <1>;
      #size-cells = <0>;
      proximity@28 {
        compatible = "semtech,sx9310";
        reg = <0x28>;
        interrupt-parent = <&pio>;
        interrupts = <5 IRQ_TYPE_LEVEL_LOW 5>;
        vdd-supply = <&pp3300_a>;
        svdd-supply = <&pp1800_prox>;
        #io-channel-cells = <1>;
        semtech,cs0-ground;
        semtech,combined-sensors = <1 2 3>;
        semtech,resolution = "fine";
        semtech,startup-sensor = <1>;
        semtech,proxraw-strength = <2>;
        semtech,avg-pos-strength = <64>;
      };
    };