dts/upstream/Bindings/net/lantiq,pef2256.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/net/lantiq,pef2256.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Lantiq PEF2256

maintainers:
  - Herve Codina <herve.codina@bootlin.com>

description:
  The Lantiq PEF2256, also known as Infineon PEF2256 or FALC56, is a framer and
  line interface component designed to fulfill all required interfacing between
  an analog E1/T1/J1 line and the digital PCM system highway/H.100 bus.

properties:
  compatible:
    items:
      - const: lantiq,pef2256

  reg:
    maxItems: 1

  clocks:
    items:
      - description: Master Clock
      - description: System Clock Receive
      - description: System Clock Transmit

  clock-names:
    items:
      - const: mclk
      - const: sclkr
      - const: sclkx

  interrupts:
    maxItems: 1

  reset-gpios:
    description:
      GPIO used to reset the device.
    maxItems: 1

  pinctrl:
    $ref: /schemas/pinctrl/pinctrl.yaml#
    additionalProperties: false

    patternProperties:
      '-pins$':
        type: object
        $ref: /schemas/pinctrl/pinmux-node.yaml#
        additionalProperties: false

        properties:
          pins:
            enum: [ RPA, RPB, RPC, RPD, XPA, XPB, XPC, XPD ]

          function:
            enum: [ SYPR, RFM, RFMB, RSIGM, RSIG, DLR, FREEZE, RFSP, LOS,
                    SYPX, XFMS, XSIG, TCLK, XMFB, XSIGM, DLX, XCLK, XLT,
                    GPI, GPOH, GPOL ]

        required:
          - pins
          - function

  lantiq,data-rate-bps:
    enum: [2048000, 4096000, 8192000, 16384000]
    default: 2048000
    description:
      Data rate (bit per seconds) on the system highway.

  lantiq,clock-falling-edge:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Data is sent on falling edge of the clock (and received on the rising
      edge). If 'clock-falling-edge' is not present, data is sent on the
      rising edge (and received on the falling edge).

  lantiq,channel-phase:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1, 2, 3, 4, 5, 6, 7]
    default: 0
    description: |
      The pef2256 delivers a full frame (32 8-bit time-slots in E1 and 24 8-bit
      time-slots 8 8-bit signaling in E1/J1) every 125us. This lead to a data
      rate of 2048000 bit/s. When lantiq,data-rate-bps is more than 2048000
      bit/s, the data (all 32 8-bit) present in the frame are interleave with
      unused time-slots. The lantiq,channel-phase property allows to set the
      correct alignment of the interleave mechanism.
      For instance, suppose lantiq,data-rate-bps = 8192000 (ie 4*2048000), and
      lantiq,channel-phase = 2, the interleave schema with unused time-slots
      (nu) and used time-slots (XX) for TSi is
        nu nu XX nu nu nu XX nu nu nu XX nu
        <-- TSi --> <- TSi+1 -> <- TSi+2 ->
      With lantiq,data-rate-bps = 8192000, and lantiq,channel-phase = 1, the
      interleave schema is
        nu XX nu nu nu XX nu nu nu XX nu nu
        <-- TSi --> <- TSi+1 -> <- TSi+2 ->
      With lantiq,data-rate-bps = 4096000 (ie 2*2048000), and
      lantiq,channel-phase = 1, the interleave schema is
        nu    XX    nu    XX    nu    XX
        <-- TSi --> <- TSi+1 -> <- TSi+2 ->

patternProperties:
  '^codec(-([0-9]|[1-2][0-9]|3[0-1]))?$':
    type: object
    $ref: /schemas/sound/dai-common.yaml
    unevaluatedProperties: false
    description:
      Codec provided by the pef2256. This codec allows to use some of the PCM
      system highway time-slots as audio channels to transport audio data over
      the E1/T1/J1 lines.
      The time-slots used by the codec must be set and so, the properties
      'dai-tdm-slot-num', 'dai-tdm-slot-width', 'dai-tdm-slot-tx-mask' and
      'dai-tdm-slot-rx-mask' must be present in the sound card node for
      sub-nodes that involve the codec. The codec uses 8-bit time-slots.
      'dai-tdm-tdm-slot-with' must be set to 8.
      The tx and rx masks define the pef2256 time-slots assigned to the codec.

    properties:
      compatible:
        const: lantiq,pef2256-codec

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

    required:
      - compatible
      - '#sound-dai-cells'

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

additionalProperties: false

examples:
  - |
    #include <dt-bindings/gpio/gpio.h>
    #include <dt-bindings/interrupt-controller/irq.h>

    pef2256: framer@2000000 {
      compatible = "lantiq,pef2256";
      reg = <0x2000000 0x100>;
      interrupts = <8 IRQ_TYPE_LEVEL_LOW>;
      interrupt-parent = <&intc>;
      clocks = <&clk_mclk>, <&clk_sclkr>, <&clk_sclkx>;
      clock-names = "mclk", "sclkr", "sclkx";
      reset-gpios = <&gpio 11 GPIO_ACTIVE_LOW>;
      lantiq,data-rate-bps = <4096000>;

      pinctrl {
        pef2256_rpa_sypr: rpa-pins {
          pins = "RPA";
          function = "SYPR";
        };
        pef2256_xpa_sypx: xpa-pins {
          pins = "XPA";
          function = "SYPX";
        };
      };

      pef2256_codec0: codec-0 {
        compatible = "lantiq,pef2256-codec";
        #sound-dai-cells = <0>;
        sound-name-prefix = "PEF2256_0";
      };

      pef2256_codec1: codec-1 {
        compatible = "lantiq,pef2256-codec";
        #sound-dai-cells = <0>;
        sound-name-prefix = "PEF2256_1";
      };
    };

    sound {
      compatible = "simple-audio-card";
      #address-cells = <1>;
      #size-cells = <0>;
      simple-audio-card,dai-link@0 { /* CPU DAI1 - pef2256 codec 1 */
        reg = <0>;
        cpu {
          sound-dai = <&cpu_dai1>;
        };
        codec {
          sound-dai = <&pef2256_codec0>;
          dai-tdm-slot-num = <4>;
          dai-tdm-slot-width = <8>;
          /* TS 1, 2, 3, 4 */
          dai-tdm-slot-tx-mask = <0 1 1 1 1>;
          dai-tdm-slot-rx-mask = <0 1 1 1 1>;
        };
      };
      simple-audio-card,dai-link@1 { /* CPU DAI2 - pef2256 codec 2 */
        reg = <1>;
        cpu {
          sound-dai = <&cpu_dai2>;
        };
        codec {
          sound-dai = <&pef2256_codec1>;
          dai-tdm-slot-num = <4>;
          dai-tdm-slot-width = <8>;
          /* TS 5, 6, 7, 8 */
          dai-tdm-slot-tx-mask = <0 0 0 0 0 1 1 1 1>;
          dai-tdm-slot-rx-mask = <0 0 0 0 0 1 1 1 1>;
        };
      };
    };