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

title: Freescale EloPlus DMA Controller

maintainers:
  - J. Neuschäfer <j.ne@posteo.net>

description:
  This is a 4-channel DMA controller with extended addresses and chaining,
  mainly used in Freescale mpc85xx/86xx, Pxxx and BSC series chips, such as
  mpc8540, mpc8641 p4080, bsc9131 etc.

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - fsl,mpc8540-dma
              - fsl,mpc8541-dma
              - fsl,mpc8548-dma
              - fsl,mpc8555-dma
              - fsl,mpc8560-dma
              - fsl,mpc8572-dma
              - fsl,mpc8641-dma
          - const: fsl,eloplus-dma
      - const: fsl,eloplus-dma

  reg:
    items:
      - description:
          DMA General Status Register, i.e. DGSR which contains
          status for all the 4 DMA channels

  cell-index:
    $ref: /schemas/types.yaml#/definitions/uint32
    description:
      controller index.  0 for controller @ 0x21000, 1 for controller @ 0xc000

  ranges: true
 
  "#address-cells":
    const: 1
 
  "#size-cells":
    const: 1

  interrupts:
    maxItems: 1
    description: Controller interrupt.

patternProperties:
  "^dma-channel@[0-9a-f]+$":
    type: object
    additionalProperties: false

    properties:
      compatible:
        oneOf:
          # native DMA channel
          - items:
              - enum:
                  - fsl,mpc8540-dma-channel
                  - fsl,mpc8541-dma-channel
                  - fsl,mpc8548-dma-channel
                  - fsl,mpc8555-dma-channel
                  - fsl,mpc8560-dma-channel
                  - fsl,mpc8572-dma-channel
              - const: fsl,eloplus-dma-channel
 
          # audio DMA channel, see fsl,ssi.yaml
          - const: fsl,ssi-dma-channel

      reg:
        maxItems: 1

      cell-index:
        description: DMA channel index starts at 0.

      interrupts:
        maxItems: 1
        description:
          Per-channel interrupt. Only necessary if no controller interrupt has
          been provided.

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/irq.h>
 
    dma@21300 {
        compatible = "fsl,mpc8540-dma", "fsl,eloplus-dma";
        reg = <0x21300 4>;
        #address-cells = <1>;
        #size-cells = <1>;
        ranges = <0 0x21100 0x200>;
        cell-index = <0>;
 
        dma-channel@0 {
            compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
            reg = <0 0x80>;
            cell-index = <0>;
            interrupts = <20 IRQ_TYPE_EDGE_FALLING>;
        };
 
        dma-channel@80 {
            compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
            reg = <0x80 0x80>;
            cell-index = <1>;
            interrupts = <21 IRQ_TYPE_EDGE_FALLING>;
        };
 
        dma-channel@100 {
            compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
            reg = <0x100 0x80>;
            cell-index = <2>;
            interrupts = <22 IRQ_TYPE_EDGE_FALLING>;
        };
 
        dma-channel@180 {
            compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
            reg = <0x180 0x80>;
            cell-index = <3>;
            interrupts = <23 IRQ_TYPE_EDGE_FALLING>;
        };
    };

...