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[PATCH v3 1/2] dt-bindings: npu: Add Arm Ethos-U65/U85

Rob Herring (Arm) posted 2 patches 4 months, 2 weeks ago
There is a newer version of this series
[PATCH v3 1/2] dt-bindings: npu: Add Arm Ethos-U65/U85
Posted by Rob Herring (Arm) 4 months, 2 weeks ago 
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:
+          - {}
+          - const: arm,ethos-u85
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: core
+      - const: apb
+
+  power-domains:
+    maxItems: 1
+
+  sram:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/imx93-clock.h>
+
+    npu@4a900000 {
+        compatible = "fsl,imx93-npu", "arm,ethos-u65";
+        reg = <0x4a900000 0x1000>;
+        interrupts = <GIC_SPI 178 IRQ_TYPE_LEVEL_HIGH>;
+        power-domains = <&mlmix>;
+        clocks = <&clk IMX93_CLK_ML>, <&clk IMX93_CLK_ML_APB>;
+        clock-names = "core", "apb";
+        sram = <&sram>;
+    };
+...

-- 
2.51.0
Re: [PATCH v3 1/2] dt-bindings: npu: Add Arm Ethos-U65/U85
Posted by Frank Li 4 months, 1 week ago 
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?

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

> +          - const: arm,ethos-u85
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 2
> +
> +  clock-names:
> +    items:
> +      - const: core
> +      - const: apb
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  sram:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/imx93-clock.h>
> +
> +    npu@4a900000 {
> +        compatible = "fsl,imx93-npu", "arm,ethos-u65";
> +        reg = <0x4a900000 0x1000>;
> +        interrupts = <GIC_SPI 178 IRQ_TYPE_LEVEL_HIGH>;
> +        power-domains = <&mlmix>;
> +        clocks = <&clk IMX93_CLK_ML>, <&clk IMX93_CLK_ML_APB>;
> +        clock-names = "core", "apb";
> +        sram = <&sram>;
> +    };
> +...
>
> --
> 2.51.0
>
Re: [PATCH v3 1/2] dt-bindings: npu: Add Arm Ethos-U65/U85
Posted by Rob Herring 4 months ago 
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

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