linux-kernel - Re: [PATCH 3/4] dt-bindings: add vendor-prefix and documentation for Zhouyi NPU

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Date:   Thu, 16 Dec 2021 09:29:30 -0600
From:   Rob Herring <robh@...nel.org>
To:     Dejia Shang <dejia.shang@...china.com>
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        toby.shang@...china.com
Subject: Re: [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@...china.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@...china.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@...0000000 {

aipu-shmem@...00000

> +                        compatible = "shared-dma-pool";
> +                        no-map;
> +                        reg = <0x0 0xA0000000 0x0 0x4000000>;
> +                };
> +    };
> +
> +    aipu0@...4000000 {

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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