Documentation/devicetree/bindings/sound/cirrus,cs4271.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/sound/cirrus,cs4271.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Cirrus Logic CS4271 audio CODEC

maintainers:
  - Alexander Sverdlin <alexander.sverdlin@gmail.com>
  - Nikita Shubin <nikita.shubin@maquefel.me>

description:
  The CS4271 is a stereo audio codec. This device supports both the I2C
  and the SPI bus.

allOf:
  - $ref: dai-common.yaml#
  - $ref: /schemas/spi/spi-peripheral-props.yaml#

properties:
  compatible:
    const: cirrus,cs4271

  reg:
    maxItems: 1

  spi-cpha: true

  spi-cpol: true

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

  reset-gpios:
    description:
      This pin will be deasserted before communication to the codec starts.
    maxItems: 1

  va-supply:
    description: Analog power supply.

  vd-supply:
    description: Digital power supply.

  vl-supply:
    description: Serial Control Port power supply.

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

  cirrus,amuteb-eq-bmutec:
    description:
      When given, the Codec's AMUTEB=BMUTEC flag is enabled.
    type: boolean

  cirrus,enable-soft-reset:
    description: |
      The CS4271 requires its LRCLK and MCLK to be stable before its RESET
      line is de-asserted. That also means that clocks cannot be changed
      without putting the chip back into hardware reset, which also requires
      a complete re-initialization of all registers.

      One (undocumented) workaround is to assert and de-assert the PDN bit
      in the MODE2 register. This workaround can be enabled with this DT
      property.

      Note that this is not needed in case the clocks are stable
      throughout the entire runtime of the codec.
    type: boolean

required:
  - compatible
  - reg

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/gpio/gpio.h>
    spi {
        #address-cells = <1>;
        #size-cells = <0>;
        codec@0 {
            compatible = "cirrus,cs4271";
            reg = <0>;
            #sound-dai-cells = <0>;
            spi-max-frequency = <6000000>;
            spi-cpol;
            spi-cpha;
            reset-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
            port {
                endpoint {
                    remote-endpoint = <&i2s_ep>;
                };
            };
        };
    };

...