dt-bindings: dma: Add Apple ADMAC

# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause

%YAML 1.2

---

$id: http://devicetree.org/schemas/dma/apple,admac.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Apple Audio DMA Controller (ADMAC)

description: |

  Apple's Audio DMA Controller (ADMAC) is used to fetch and store audio samples

  on SoCs from the "Apple Silicon" family.

  The controller has been seen with up to 24 channels. Even-numbered channels

  are TX-only, odd-numbered are RX-only. Individual channels are coupled to

  fixed device endpoints.

maintainers:

  - Martin Povišer <povik+lin@cutebit.org>

allOf:

  - $ref: "dma-controller.yaml#"

properties:

  compatible:

    items:

      - enum:

          - apple,t6000-admac

          - apple,t8103-admac

      - const: apple,admac

  reg:

    maxItems: 1

  '#dma-cells':

    const: 1

    description:

      Clients specify a single cell with channel number.

  dma-channels:

    maximum: 24

  interrupts:

    minItems: 4

    maxItems: 4

    description:

      Interrupts that correspond to the 4 IRQ outputs of the controller. Usually

      only one of the controller outputs will be connected as an usable interrupt

      source. The remaining interrupts will be left without a valid value, e.g.

      in an interrupts-extended list the disconnected positions will contain

      an empty phandle reference <0>.

required:

  - compatible

  - reg

  - '#dma-cells'

  - dma-channels

  - interrupts

additionalProperties: false

examples:

  - |

    #include <dt-bindings/interrupt-controller/apple-aic.h>

    #include <dt-bindings/interrupt-controller/irq.h>

    admac: dma-controller@238200000 {

      compatible = "apple,t8103-admac", "apple,admac";

      reg = <0x38200000 0x34000>;

      dma-channels = <24>;

      interrupts-extended = <0>,

                            <&aic AIC_IRQ 626 IRQ_TYPE_LEVEL_HIGH>,

                            <0>,

                            <0>;

      #dma-cells = <1>;

    };