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

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Message-Id: <20250722-ethos-v1-1-cc1c5a0cbbfb@kernel.org>
Date: Tue, 22 Jul 2025 17:58:56 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Tomeu Vizoso <tomeu@...euvizoso.net>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Oded Gabbay <ogabbay@...nel.org>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Sumit Semwal <sumit.semwal@...aro.org>, 
 Christian König <christian.koenig@....com>, 
 Robin Murphy <robin.murphy@....com>, Steven Price <steven.price@....com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org, 
 linaro-mm-sig@...ts.linaro.org
Subject: [PATCH RFC 1/2] dt-bindings: npu: Add Arm Ethos-U65/U85

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@...nel.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@...nel.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@...00000 {
+        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>;
+    };
+...

-- 
2.47.2