Documentation/devicetree/bindings/sound/rockchip,rk3308-codec.yaml

# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/sound/rockchip,rk3308-codec.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Rockchip RK3308 Internal Codec

description: |
  This is the audio codec embedded in the Rockchip RK3308
  SoC. It has 8 24-bit ADCs and 2 24-bit DACs. The maximum supported
  sampling rate is 192 kHz.

  It is connected internally to one out of a selection of the internal I2S
  controllers.

  The RK3308 audio codec has 8 independent capture channels, but some
  features work on stereo pairs called groups:
    * grp 0 -- MIC1 / MIC2
    * grp 1 -- MIC3 / MIC4
    * grp 2 -- MIC5 / MIC6
    * grp 3 -- MIC7 / MIC8

maintainers:
  - Luca Ceresoli <luca.ceresoli@bootlin.com>

properties:
  compatible:
    const: rockchip,rk3308-codec

  reg:
    maxItems: 1

  rockchip,grf:
    $ref: /schemas/types.yaml#/definitions/phandle
    description:
      Phandle to the General Register Files (GRF)

  clocks:
    items:
      - description: clock for TX
      - description: clock for RX
      - description: AHB clock driving the interface

  clock-names:
    items:
      - const: mclk_tx
      - const: mclk_rx
      - const: hclk

  port:
    $ref: audio-graph-port.yaml#
    unevaluatedProperties: false

  resets:
    maxItems: 1

  reset-names:
    items:
      - const: codec

  "#sound-dai-cells":
    const: 0

  rockchip,micbias-avdd-percent:
    description: |
      Voltage setting for the MICBIAS pins expressed as a percentage of
      AVDD.

      E.g. if rockchip,micbias-avdd-percent = 85 and AVDD = 3v3, then the
      MIC BIAS voltage will be 3.3 V * 85% = 2.805 V.

    enum: [ 50, 55, 60, 65, 70, 75, 80, 85 ]

required:
  - compatible
  - reg
  - rockchip,grf
  - clocks
  - resets
  - "#sound-dai-cells"

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/rk3308-cru.h>

    audio_codec: audio-codec@ff560000 {
        compatible = "rockchip,rk3308-codec";
        reg = <0xff560000 0x10000>;
        rockchip,grf = <&grf>;
        clock-names = "mclk_tx", "mclk_rx", "hclk";
        clocks = <&cru SCLK_I2S2_8CH_TX_OUT>,
                 <&cru SCLK_I2S2_8CH_RX_OUT>,
                 <&cru PCLK_ACODEC>;
        reset-names = "codec";
        resets = <&cru SRST_ACODEC_P>;
        #sound-dai-cells = <0>;
    };

...