On Wed, 2024-10-23 at 15:59 -0500, David Lechner wrote: > The AXI SPI Engine has support for hardware offloading capabilities. > This includes a connection to a DMA controller for streaming RX data > and a trigger input for starting execution of the SPI message programmed > in the offload. > > Signed-off-by: David Lechner <dlechner@xxxxxxxxxxxx> > --- > v4 changes: > * Dropped #spi-offload-cells property. > * Changed subject line. > > v3 changes: > * Added #spi-offload-cells property. > * Added properties for triggers and RX data stream connected to DMA. > > v2 changes: > > This is basically a new patch. It partially replaces "dt-bindings: iio: > offload: add binding for PWM/DMA triggered buffer". > > The controller no longer has an offloads object node and the > spi-offloads property is now a standard SPI peripheral property. > --- > .../bindings/spi/adi,axi-spi-engine.yaml | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml > b/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml > index d48faa42d025..5281b4871209 100644 > --- a/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml > +++ b/Documentation/devicetree/bindings/spi/adi,axi-spi-engine.yaml > @@ -41,6 +41,24 @@ 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. > + $ref: /schemas/types.yaml#/definitions/phandle-array > + > + dmas: > + description: > + DMA channels connected to the output stream interface of an offload > instance. > + minItems: 1 > + maxItems: 32 > + > + dma-names: > + minItems: 1 > + maxItems: 32 > + items: > + pattern: "^offload(?:[12]?[0-9]|3[01])-rx$" I think the core is already capable of tx offload? If so, we could already have that in the bindings. - Nuno Sá
