Commit 34ce2930 authored by Paul Cercueil's avatar Paul Cercueil Committed by Ulf Hansson
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dt-bindings: mmc: ingenic: Support using bi-directional DMA channel 



Update the binding documentation and the examples to support
bi-directional DMA channels.

Signed-off-by: default avatarPaul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20211220190840.108061-2-paul@crapouillou.net


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 1a6fe7bb

Documentation/devicetree/bindings/mmc/ingenic,mmc.yaml

+31 −6
Original line number Diff line number Diff line
@@ -39,14 +39,15 @@ properties: 
    const: mmc



  dmas:

    items:

      - description: DMA controller phandle and request line for RX

      - description: DMA controller phandle and request line for TX

    minItems: 1

    maxItems: 2



  dma-names:

    items:

    oneOf:

      - items:

          - const: rx

          - const: tx

      - const: tx-rx



required:

  - compatible
@@ -80,3 +81,27 @@ examples: 
             <&dma JZ4780_DMA_MSC0_TX 0xffffffff>;

      dma-names = "rx", "tx";

    };

  - |

    #include <dt-bindings/clock/ingenic,jz4780-cgu.h>

    #include <dt-bindings/dma/jz4780-dma.h>

    /*

     * Alternative version of the example above,

     * but using one single DMA channel for both

     * TX and RX.

     */

    mmc1: mmc@13460000 {

      compatible = "ingenic,jz4780-mmc";

      reg = <0x13460000 0x1000>;



      interrupt-parent = <&intc>;

      interrupts = <36>;



      clocks = <&cgu JZ4780_CLK_MSC1>;

      clock-names = "mmc";



      cap-sd-highspeed;

      cap-mmc-highspeed;

      cap-sdio-irq;

      dmas = <&dma JZ4780_DMA_MSC1_TX JZ4780_DMA_MSC1_RX 0xffffffff>;

      dma-names = "tx-rx";

    };