dts/bindings/audio/nxp,dmic.yaml

# Copyright 2023 NXP
# SPDX-License-Identifier: Apache-2.0

description: NXP DMIC

compatible: "nxp,dmic"

include: [base.yaml, pinctrl-device.yaml]

properties:
  reg:
    required: true

  interrupts:
    required: true

  pinctrl-0:
    required: true

  clocks:
    required: true

  use2fs:
    type: boolean
    description: |
      Use 2FS output, and bypass final half band decimator. This will reduce
      the required PDM bit clock frequency by a factor of two, and can reduce
      power consumption.

# Child binding definition, describes each channel of the DMIC
child-binding:
  description: |
    NXP DMIC channel. Can be used to configure filtering and gain attributes
    of each channel
  include: base.yaml
  compatible: "nxp,dmic-channel"
  properties:
    reg:
      required: true
    dmas:
      required: true

    gainshift:
      type: int
      default: 0
      description: |
        Decimator gain shift. Sets the number of bits to shift decimated PCM
        data by, as a positive or negative number. Range of [-15,15]. Default
        is reset value of register

    compensation-2fs:
      type: string
      default: "zero"
      enum:
        - "zero"
        - "-0.16"
        - "-0.15"
        - "-0.13"
      description: |
        2FS compensation filter. See SOC reference manual for filter response
        of each value. Default value is reset value of register, and
        recommended filter setting.

    compensation-4fs:
      type: string
      default: "zero"
      enum:
        - "zero"
        - "-0.16"
        - "-0.15"
        - "-0.13"
      description: |
        4FS compensation filter. See SOC reference manual for filter response
        of each value. Default value is reset value of register, and
        recommended filter setting.

    dc-cutoff:
      type: string
      default: "flat"
      enum:
        - "flat"
        - "155hz"
        - "78hz"
        - "39hz"
      description: |
        DC cutoff filter setting. Default is reset value of register. Note that
        each cutoff frequency is based on a sample frequency of 16KHz, so
        actual cutoff values will scale up or down based on your sampling
        frequency

    dc-gain:
      type: int
      default: 0
      description: |
        DC gain fine adjustment. Number of bits to downshift the final
        conversion result. Max value of 15. Default is reset value of
        register