linux-kernel - Re: [PATCH v2 13/13] dt-bindings: arm: Add Samsung Trinity bindings

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Date:   Wed, 21 Sep 2022 20:42:35 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jiho Chu <jiho.chu@...sung.com>, gregkh@...uxfoundation.org,
        arnd@...db.de, ogabbay@...nel.org, broonie@...nel.org
Cc:     linux-kernel@...r.kernel.org, yelini.jeong@...sung.com,
        myungjoo.ham@...sung.com
Subject: Re: [PATCH v2 13/13] dt-bindings: arm: Add Samsung Trinity bindings

On 17/09/2022 09:23, Jiho Chu wrote:
> The Trinity Neural Processing Unit (NPU) is a hardware IP for providing
> hardware acceleration for neural network processing workloads. It has
> own virtual ISA decoder unit, and controlled by memory mapped control
> registers. The IP is composed of Common Processor (CP), Digital Signal
> Processor (DSP) and Deep Learning Accelerator (DLA). ComBox is register
> set to control IRQ or check overall status of the IP.
> 
> Signed-off-by: Jiho Chu <jiho.chu@...sung.com>
> Signed-off-by: Yelin Jeong <yelini.jeong@...sung.com>
> Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
> ---
>  .../bindings/arm/samsung,trinity.yaml         | 115 ++++++++++++++++++
>  1 file changed, 115 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/samsung,trinity.yaml
> 
> diff --git a/Documentation/devicetree/bindings/arm/samsung,trinity.yaml b/Documentation/devicetree/bindings/arm/samsung,trinity.yaml
> new file mode 100644
> index 000000000000..cd79ec040162
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/samsung,trinity.yaml
> @@ -0,0 +1,115 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/samsung,trinity.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung Trinity NPU Family
> +
> +maintainers:
> +  - Jiho Chu <jiho.chu@...sung.com>
> +
> +description: |
> +  The Trinity Neural Processing Unit (NPU) is a hardware IP for providing
> +  hardware acceleration for neural network processing workloads. It has
> +  own virtual ISA decoder unit, and controlled by memory mapped control
> +  registers. The IP is composed of Common Processor (CP), Digital Signal
> +  Processor (DSP) and Deep Learning Accelerator (DLA). ComBox is register
> +  set to control IRQ or check overall status of the IP.
> +
> +properties:
> +  compatible:
> +    const: samsung,trinity
> +
> +  samsung,trinity-type:
> +    description: type of trinity family
> +    enum: ['triv2']

No, we have compatible for this.

> +
> +  samsung,tops:
> +    description: Performance metric (Tera Operation Per Seconds)
> +    enum: [2, 8]

What piece of hardware this describes?

> +
> +  samsung,idu_cp:

No underscores in names.

Missing ref/type. Missing description. I am not sure that this belongs
to DT.


> +    items:
> +      - description: Address of zero data of CP
> +      - description: Address of IDU data of CP
> +      - description: Maximum size of CP's IDU binary

> +
> +  samsung,idu_dsp:

The same.

> +    items:
> +      - description: Address of zero data of DSP
> +      - description: Address of IDU data of DSP
> +      - description: Maximum size of DSP's IDU binary
> +
> +  samsung,dspm:
> +    description: The size of Data Scratch-Pad Memory
> +
> +  memory-region:
> +    description:
> +      phandle to the reserved memory node to be associated
> +      with the trinity device. The reserved memory node
> +      can be a CMA memory node.
> +      Documentation/devicetree/bindings/reserved-memory/reserved-memory.yaml
> +
> +  dma-coherent: true
> +
> +  reg:
> +    items:
> +      - description: Memory mapped register of CP
> +      - description: Memory mapped register of DSP
> +      - description: Memory mapped register of ComBox
> +
> +  reg-names:
> +    items:
> +      - const: cp-mmreg
> +      - const: dsp-mmreg
> +      - const: cbox-mmreg

Drop "reg" suffixes.

> +
> +  interrupts:
> +    description: workload complete interrupt
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - samsung,trinity-type
> +  - samsung,tops
> +  - samsung,idu_cp
> +  - samsung,idu_dsp
> +  - samsung,dspm
> +  - memory-region
> +  - dma-coherent
> +  - reg
> +  - reg-names
> +  - interrupts
> +
> +examples:
> +  - |
> +    reserved-memory {
> +        #address-cells = <2>;
> +        #size-cells = <1>;
> +        trinity_dram_0: memory@...00000 {
> +            compatible = "shared-dma-pool";
> +            no-map;
> +            reg = <0x0 0x80000000 0x10000000>;
> +        };
> +    };

Drop this part - it is fairly obvious.

> +
> +    triv2@...0C00000 {
> +        compatible = "samsung,trinity";
> +        samsung,trinity-type = "triv2";
> +        samsung,tops = <8>;
> +        samsung,idu_cp = /bits/ 64 <0x30400000 0x30400010 0x10000>;
> +        samsung,idu_dsp = /bits/ 64 <0x30500000 0x30500010 0x10000>;
> +        samsung,dspm = <0x40000>;
> +
> +        memory-region = <&trinity_dram_0>
> +
> +        dma-coherent;
> +
> +        reg =   <0x0 0x30C10000 0x0 0x10000>, /* CP MMREG base */
> +                <0x0 0x30D40000 0x0 0x10000>, /* DSP MMREG base */
> +                <0x0 0x30DF0000 0x0 0x01000>; /* ComBox MMREG base */


reg and reg-names go after compatible.

> +        reg-names = "cp-mmreg", "dsp-mmreg", "cbox-mmreg";
> +
> +        interrupts = <GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>;
> +    };

Best regards,
Krzysztof