Unverified Commit e1101373 authored by David Lechner's avatar David Lechner Committed by Mark Brown
Browse files

spi: dt-bindings: axi-spi-engine: add SPI offload properties 



The AXI SPI Engine has support for hardware offloading capabilities.
This includes a connection to a DMA controller for streaming RX or TX
data and a trigger input for starting execution of the SPI message
programmed in the offload. It is designed to support up to 32 offload
instances.

Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: default avatarRob Herring (Arm) <robh@kernel.org>
Signed-off-by: default avatarDavid Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250207-dlech-mainline-spi-engine-offload-2-v8-6-e48a489be48c@baylibre.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 700a2819

Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml

+24 −0
Original line number Diff line number Diff line
@@ -41,6 +41,26 @@ properties: 
      - const: s_axi_aclk

      - const: spi_clk



  trigger-sources:

    description:

      An array of trigger source phandles for offload instances. The index in

      the array corresponds to the offload instance number.

    minItems: 1

    maxItems: 32



  dmas:

    description:

      DMA channels connected to the input or output stream interface of an

      offload instance.

    minItems: 1

    maxItems: 32



  dma-names:

    items:

      pattern: "^offload(?:[12]?[0-9]|3[01])-[tr]x$"

    minItems: 1

    maxItems: 32



required:

  - compatible

  - reg
@@ -59,6 +79,10 @@ examples: 
        clocks = <&clkc 15>, <&clkc 15>;

        clock-names = "s_axi_aclk", "spi_clk";



        trigger-sources = <&trigger_clock>;

        dmas = <&dma 0>;

        dma-names = "offload0-rx";



        #address-cells = <1>;

        #size-cells = <0>;