On Mon, Sep 29, 2025 at 1:54 PM Frank Li Frank.li@nxp.com wrote:

On Fri, Sep 26, 2025 at 03:00:48PM -0500, Rob Herring (Arm) wrote:

...

Add a binding schema for Arm Ethos-U65/U85 NPU. The Arm Ethos-U NPUs are designed for edge AI inference applications.

Signed-off-by: Rob Herring (Arm) robh@kernel.org

.../devicetree/bindings/npu/arm,ethos.yaml | 79 ++++++++++++++++++++++ 1 file changed, 79 insertions(+)

diff --git a/Documentation/devicetree/bindings/npu/arm,ethos.yaml b/Documentation/devicetree/bindings/npu/arm,ethos.yaml new file mode 100644 index 000000000000..716c4997f976 --- /dev/null +++ b/Documentation/devicetree/bindings/npu/arm,ethos.yaml @@ -0,0 +1,79 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/npu/arm,ethos.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml#

+title: Arm Ethos U65/U85

+maintainers:

• • Rob Herring robh@kernel.org

+description: >

• The Arm Ethos-U NPUs are designed for IoT inference applications. The NPUs
• can accelerate 8-bit and 16-bit integer quantized networks:
• Transformer networks (U85 only)
• Convolutional Neural Networks (CNN)
• Recurrent Neural Networks (RNN)
• Further documentation is available here:
• U65 TRM: https://developer.arm.com/documentation/102023/
• U85 TRM: https://developer.arm.com/documentation/102685/

+properties:

• compatible:
• oneOf:

•  - items:
  

•      - enum:
  

•          - fsl,imx93-npu
  

•      - const: arm,ethos-u65
  

•  - items:
  

•      - {}
  

what's means {} here ?, just not allow arm,ethos-u85 alone?

Yes, u85 support is currently on a FVP model. The naming for it isn't really clear yet nor is it clear if it ever will be. So really just a placeholder until there is a chip using it. It keeps folks from using just the fallback.

Reviewed-by: Frank Li Frank.Li@nxp.com

Thanks, Rob