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SubjectRe: [PATCH 3/4] dt-bindings: add vendor-prefix and documentation for Zhouyi NPU
On Wed, Dec 15, 2021 at 06:36:08PM +0800, Dejia Shang wrote:
> To enable this NPU IP in Arm-Linux system, SoC vendors should
> write devicetree files as documented.
>
> Signed-off-by: Dejia Shang <dejia.shang@armchina.com>
> ---
> .../bindings/misc/armchina,zhouyi-npu.yaml | 57 +++++++++++++++++++
> .../devicetree/bindings/vendor-prefixes.yaml | 2 +
> 2 files changed, 59 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/misc/armchina,zhouyi-npu.yaml
>
> diff --git a/Documentation/devicetree/bindings/misc/armchina,zhouyi-npu.yaml b/Documentation/devicetree/bindings/misc/armchina,zhouyi-npu.yaml
> new file mode 100644
> index 000000000000..d3fdea101114
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/armchina,zhouyi-npu.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/misc/armchina,zhouyi-npu.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: ArmChina Zhouyi NPU bindings
> +
> +maintainers:
> + - Dejia Shang <dejia.shang@armchina.com>
> +
> +description: |
> + Armchina AI accelerator IP - Zhouyi NPU
> +
> +properties:
> + compatible:
> + items:
> + - const: armchina,zhouyi-v1
> + - const: armchina,zhouyi-v2
> + - const: armchina,zhouyi

This says compatible must be a list of all 3 of these.

Where do v1 and v2 come from? We don't do version numbers in DT usually
unless they correspond to h/w revision registers or h/w documentation. I
would assume the h/w follows the Arm rXpY form?

> +
> + reg:
> + maxItems: 1
> +
> + memory-region:
> + maxItems: 2

What is each region?

This requires 2 entries, but the example only has 1.

> +
> + interrupts:
> + maxItems: 1
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> + reserved-memory {
> + #address-cells = <2>;
> + #size-cells = <2>;
> + ranges;
> +
> + aipu_ddr_reserved: aipu-shmem@0xA0000000 {

aipu-shmem@a0000000

> + compatible = "shared-dma-pool";
> + no-map;
> + reg = <0x0 0xA0000000 0x0 0x4000000>;
> + };
> + };
> +
> + aipu0@0x64000000 {

Drop '0x'

> + compatible = "armchina,zhouyi";
> + reg = <0x0 0x64000000 0x0 0x1000>;
> + memory-region=<&aipu_ddr_reserved>;
> + interrupts = <0 168 1>;
> + };
> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
> index 66d6432fd781..4b1865d92455 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
> @@ -123,6 +123,8 @@ patternProperties:
> description: ARM Ltd.
> "^armadeus,.*":
> description: ARMadeus Systems SARL
> + "^armchina,.*":
> + description: Arm Technology (China) Co., Ltd.
> "^arrow,.*":
> description: Arrow Electronics
> "^artesyn,.*":
> --
> 2.17.1
>
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