linux-stable/Documentation/devicetree/bindings/sound/fsl,sai.yaml

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

title: Freescale Synchronous Audio Interface (SAI).

maintainers:
  - Shengjiu Wang <shengjiu.wang@nxp.com>

description: |
  The SAI is based on I2S module that used communicating with audio codecs,
  which provides a synchronous audio interface that supports fullduplex
  serial interfaces with frame synchronization such as I2S, AC97, TDM, and
  codec/DSP interfaces.  

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - fsl,imx6ul-sai
              - fsl,imx7d-sai
          - const: fsl,imx6sx-sai

      - items:
          - enum:
              - fsl,imx8mm-sai
              - fsl,imx8mn-sai
              - fsl,imx8mp-sai
          - const: fsl,imx8mq-sai

      - items:
          - enum:
              - fsl,imx6sx-sai
              - fsl,imx7ulp-sai
              - fsl,imx8mq-sai
              - fsl,imx8qm-sai
              - fsl,imx8ulp-sai
              - fsl,imx93-sai
              - fsl,imx95-sai
              - fsl,vf610-sai

  reg:
    maxItems: 1

  clocks:
    items:
      - description: The ipg clock for register access
      - description: master clock source 0 (obsoleted)
      - description: master clock source 1
      - description: master clock source 2
      - description: master clock source 3
      - description: PLL clock source for 8kHz series
      - description: PLL clock source for 11kHz series
    minItems: 4

  clock-names:
    oneOf:
      - items:
          - const: bus
          - const: mclk0
          - const: mclk1
          - const: mclk2
          - const: mclk3
          - const: pll8k
          - const: pll11k
        minItems: 5
      - items:
          - const: bus
          - const: mclk1
          - const: mclk2
          - const: mclk3
          - const: pll8k
          - const: pll11k
        minItems: 4

  power-domains:
    maxItems: 1

  dmas:
    minItems: 1
    items:
      - description: DMA controller phandle and request line for RX
      - description: DMA controller phandle and request line for TX

  dma-names:
    minItems: 1
    items:
      - const: rx
      - const: tx

  interrupts:
    items:
      - description: receive and transmit interrupt

  big-endian:
    description: |
      required if all the SAI registers are big-endian rather than little-endian.      
    type: boolean

  fsl,dataline:
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    description: |
      Configure the dataline. It has 3 value for each configuration      
    maxItems: 16
    items:
      items:
        - description: format Default(0), I2S(1) or PDM(2)
          enum: [0, 1, 2]
        - description: dataline mask for 'rx'
        - description: dataline mask for 'tx'

  fsl,sai-mclk-direction-output:
    description: SAI will output the SAI MCLK clock.
    type: boolean

  fsl,sai-synchronous-rx:
    description: |
      SAI will work in the synchronous mode (sync Tx with Rx) which means
      both the transmitter and the receiver will send and receive data by
      following receiver's bit clocks and frame sync clocks.      
    type: boolean

  fsl,sai-asynchronous:
    description: |
      SAI will work in the asynchronous mode, which means both transmitter
      and receiver will send and receive data by following their own bit clocks
      and frame sync clocks separately.
      If both fsl,sai-asynchronous and fsl,sai-synchronous-rx are absent, the
      default synchronous mode (sync Rx with Tx) will be used, which means both
      transmitter and receiver will send and receive data by following clocks
      of transmitter.      
    type: boolean

  fsl,shared-interrupt:
    description: Interrupt is shared with other modules.
    type: boolean

  lsb-first:
    description: |
      Configures whether the LSB or the MSB is transmitted
      first for the fifo data. If this property is absent,
      the MSB is transmitted first as default, or the LSB
      is transmitted first.      
    type: boolean

  "#sound-dai-cells":
    const: 0
    description: optional, some dts node didn't add it.

allOf:
  - $ref: dai-common.yaml#
  - if:
      required:
        - fsl,sai-asynchronous
    then:
      properties:
        fsl,sai-synchronous-rx: false

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

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/clock/vf610-clock.h>
    sai2: sai@40031000 {
        compatible = "fsl,vf610-sai";
        reg = <0x40031000 0x1000>;
        interrupts = <86 IRQ_TYPE_LEVEL_HIGH>;
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_sai2_1>;
        clocks = <&clks VF610_CLK_PLATFORM_BUS>,
                 <&clks VF610_CLK_SAI2>,
                 <&clks 0>, <&clks 0>;
        clock-names = "bus", "mclk1", "mclk2", "mclk3";
        dma-names = "rx", "tx";
        dmas = <&edma0 0 20>, <&edma0 0 21>;
        big-endian;
        lsb-first;
    };    

  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/clock/imx8mm-clock.h>
    sai1: sai@30010000 {
        compatible = "fsl,imx8mm-sai", "fsl,imx8mq-sai";
        reg = <0x30010000 0x10000>;
        interrupts = <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>;
        clocks = <&clk IMX8MM_CLK_SAI1_IPG>,
                 <&clk IMX8MM_CLK_DUMMY>,
                 <&clk IMX8MM_CLK_SAI1_ROOT>,
                 <&clk IMX8MM_CLK_DUMMY>, <&clk IMX8MM_CLK_DUMMY>;
        clock-names = "bus", "mclk0", "mclk1", "mclk2", "mclk3";
        dmas = <&sdma2 0 2 0>, <&sdma2 1 2 0>;
        dma-names = "rx", "tx";
        fsl,dataline = <1 0xff 0xff 2 0xff 0x11>;
        #sound-dai-cells = <0>;
    };