Re: [PATCH V2 4/5] dt-bindings: dma: xlnx,axi-dma: Add "xlnx,include-stscntrl-strm" property

[Rob Herring (Arm)]

On Fri, 13 Mar 2026 11:55:32 +0530, Srinivas Neeli wrote:
> Add an optional boolean DT property "xlnx,include-stscntrl-strm" to
> indicate that the AXI DMA IP is configured with the AXI4-Stream status
> and control interface. This enables the use of APP fields in DMA
> descriptors for metadata reporting.
> 
> This property is distinct from "xlnx,axistream-connected" and serves a
> different purpose:
> 
> - "xlnx,include-stscntrl-strm": Indicates whether APP fields are present
>   in DMA descriptors. When enabled, the driver can access status/control
>   metadata through these descriptor fields.
> 
> - "xlnx,axistream-connected": Indicates whether a streaming IP (client)
>   is connected to the DMA IP.
> 
> These two configurations are independent of each other. For example, in
> TSN (Time-Sensitive Networking) designs, a streaming client may be
> connected to the DMA IP, but the status/control stream interface is not
> enabled. In such cases, "xlnx,axistream-connected" would be present while
> "xlnx,include-stscntrl-strm" would be absent.
> 
> Adding this property allows the driver to correctly determine descriptor
> layout and access APP fields only when the hardware supports them.
> 
> Signed-off-by: Suraj Gupta <suraj.gupta2@xxxxxxx>
> Signed-off-by: Srinivas Neeli <srinivas.neeli@xxxxxxx>
> ---
>  .../devicetree/bindings/dma/xilinx/xlnx,axi-dma.yaml          | 4 ++++
>  1 file changed, 4 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@xxxxxxxxxx>