kernel/Documentation/devicetree/bindings/sound/samsung-i2s.yaml

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/sound/samsung-i2s.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Samsung SoC I2S controller

maintainers:
  - Krzysztof Kozlowski <krzk@kernel.org>
  - Sylwester Nawrocki <s.nawrocki@samsung.com>

properties:
  compatible:
    description: |
      samsung,s3c6410-i2s: for 8/16/24bit stereo I2S.

      samsung,s5pv210-i2s: for 8/16/24bit multichannel (5.1) I2S with
      secondary FIFO, s/w reset control and internal mux for root clock
      source.

      samsung,exynos5420-i2s: for 8/16/24bit multichannel (5.1) I2S for
      playback, stereo channel capture, secondary FIFO using internal
      or external DMA, s/w reset control, internal mux for root clock
      source and 7.1 channel TDM support for playback; TDM (Time division
      multiplexing) is to allow transfer of multiple channel audio data on
      single data line.

      samsung,exynos7-i2s: with all the available features of Exynos5 I2S.
      Exynos7 I2S has 7.1 channel TDM support for capture, secondary FIFO
      with only external DMA and more number of root clock sampling
      frequencies.

      samsung,exynos7-i2s1: I2S1 on previous samsung platforms supports
      stereo channels. Exynos7 I2S1 upgraded to 5.1 multichannel with
      slightly modified bit offsets.
    enum:
      - samsung,s3c6410-i2s
      - samsung,s5pv210-i2s
      - samsung,exynos5420-i2s
      - samsung,exynos7-i2s
      - samsung,exynos7-i2s1

  '#address-cells':
    const: 1

  '#size-cells':
    const: 0

  reg:
    maxItems: 1

  dmas:
    minItems: 2
    maxItems: 3

  dma-names:
    oneOf:
      - items:
          - const: tx
          - const: rx
      - items:
          - const: tx
          - const: rx
          - const: tx-sec

  assigned-clock-parents: true
  assigned-clocks: true

  clocks:
    minItems: 1
    maxItems: 3

  clock-names:
    oneOf:
      - items:
          - const: iis
      - items: # for I2S0
          - const: iis
          - const: i2s_opclk0
          - const: i2s_opclk1
      - items: # for I2S1 and I2S2
          - const: iis
          - const: i2s_opclk0
    description: |
      "iis" is the I2S bus clock and i2s_opclk0, i2s_opclk1 are sources
      of the root clock. I2S0 has internal mux to select the source
      of root clock and I2S1 and I2S2 doesn't have any such mux.

  "#clock-cells":
    const: 1

  clock-output-names:
    deprecated: true
    oneOf:
      - items: # for I2S0
          - const: i2s_cdclk0
      - items: # for I2S1
          - const: i2s_cdclk1
      - items: # for I2S2
          - const: i2s_cdclk2
    description: Names of the CDCLK I2S output clocks.

  interrupts:
    maxItems: 1

  samsung,idma-addr:
    $ref: /schemas/types.yaml#/definitions/uint32
    description: |
      Internal DMA register base address of the audio
      subsystem (used in secondary sound source).

  pinctrl-0:
    description: Should specify pin control groups used for this controller.

  pinctrl-names:
    const: default

  power-domains:
    maxItems: 1

  "#sound-dai-cells":
    const: 1

required:
  - compatible
  - reg
  - dmas
  - dma-names
  - clocks
  - clock-names

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/exynos-audss-clk.h>

    i2s0: i2s@3830000 {
        compatible = "samsung,s5pv210-i2s";
        reg = <0x03830000 0x100>;
        dmas = <&pdma0 10>,
                <&pdma0 9>,
                <&pdma0 8>;
        dma-names = "tx", "rx", "tx-sec";
        clocks = <&clock_audss EXYNOS_I2S_BUS>,
                <&clock_audss EXYNOS_I2S_BUS>,
                <&clock_audss EXYNOS_SCLK_I2S>;
        clock-names = "iis", "i2s_opclk0", "i2s_opclk1";
        #clock-cells = <1>;
        samsung,idma-addr = <0x03000000>;
        pinctrl-names = "default";
        pinctrl-0 = <&i2s0_bus>;
        #sound-dai-cells = <1>;
    };