linux-kernel - Re: [PATCH 1/3] media: dt-bindings: add MT8188 AIE

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Message-ID: <44aa4f77-1f9e-47ec-a955-0dc991d8f6d1@kernel.org>
Date: Wed, 17 Jul 2024 15:04:19 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: 20220614094956 created <yelian.wang@...iatek.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: linux-media@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org,
 Project_Global_Chrome_Upstream_Group@...iatek.com, yaya.chang@...iatek.com,
 teddy.chen@...iatek.com, hidenorik@...omium.org
Subject: Re: [PATCH 1/3] media: dt-bindings: add MT8188 AIE

On 17/07/2024 14:41, 20220614094956 created wrote:
> From: Yelian Wang <yelian.wang@...iatek.com>
> 
> Add YAML device tree binding for MT8188 AIE.
> 
> Signed-off-by: Yelian Wang <yelian.wang@...iatek.com>
> ---
>  .../bindings/media/mediatek-aie.yaml          | 99 +++++++++++++++++++
>  1 file changed, 99 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek-aie.yaml

Filename matching compatible.

> 
> diff --git a/Documentation/devicetree/bindings/media/mediatek-aie.yaml b/Documentation/devicetree/bindings/media/mediatek-aie.yaml
> new file mode 100644
> index 000000000000..300aef43e02b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/mediatek-aie.yaml
> @@ -0,0 +1,99 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/mediatek-aie.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: The AIE Unit of MediaTek Camera System

What is AIE?

> +
> +maintainers:
> +  - Yelian Wang <yelian.wang@...iatek.com>
> +
> +description:
> +  MediaTek AIE is the ISP unit in MediaTek SoC.


AIE is ISP? Say something more, including unwinding of the acronym.
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: mediatek,mt8188-aie
> +      - enum:
> +          - mediatek,aie-hw3.1
> +          - mediatek,aie-hw3.0

Nope, you cannot have flexible fallbacks. Anyway, drop hardware
versions. Do you see them anywhere in other bindings? Use only SoC
compatible.


> +
> +  "#address-cells":
> +    const: 2

Why?


> +
> +  "#size-cells":
> +    const: 2

Why?

> +
> +  reg:
> +    maxItems: 2

You must list and describe items.


> +
> +  interrupts:
> +    maxItems: 1
> +
> +  mediatek,larb:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Must contain the local arbiters in the current SoCs, see
> +      Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.yaml
> +      for details.
> +
> +  iommus:
> +    maxItems: 4
> +    description:
> +      Points to the respective IOMMU block with master port as argument, see
> +      Documentation/devicetree/bindings/iommu/mediatek,iommu.yaml for details.
> +      Ports are according to the HW.
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 4
> +    minItems: 4

Drop minItems.

List and describe the items instead.

> +
> +  clock-names:
> +    items:
> +      - const: IMG_IPE
> +      - const: IPE_FDVT
> +      - const: IPE_SMI_LARB12
> +      - const: IPE_TOP

Nope. Please use DTS coding style.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - iommus
> +  - power-domains
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>

You do not use anything from this header.

> +    #include <dt-bindings/memory/mediatek,mt8188-memory-port.h>
> +    #include <dt-bindings/power/mediatek,mt8188-power.h>
> +    #include <dt-bindings/clock/mediatek,mt8188-clk.h>
> +    aie: aie@...10000 {

Drop unused label.

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


Best regards,
Krzysztof