linux-kernel - Re: [PATCH v2 04/15] dt-bindings: display: mediatek: padding: Add documentation for MT8188

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Date:   Thu, 15 Jun 2023 10:32:03 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Hsiao Chien Sung <shawn.sung@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        Jason-JH Lin <jason-jh.lin@...iatek.com>
Subject: Re: [PATCH v2 04/15] dt-bindings: display: mediatek: padding: Add
 documentation for MT8188

On 14/06/2023 09:31, Hsiao Chien Sung wrote:
> PADDING is a new hardware module on MediaTek MT8188,
> Add device tree bindings documentation for it.
> 

A nit, subject: drop second/last, redundant "documentation for". The
"dt-bindings" prefix is already stating that these are bindings and
documentation.

> Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> ---
>  .../display/mediatek/mediatek,padding.yaml    | 81 +++++++++++++++++++
>  1 file changed, 81 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/mediatek/mediatek,padding.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,padding.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,padding.yaml
> new file mode 100644
> index 000000000000..390a518fa2cf
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,padding.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/mediatek/mediatek,padding.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek PADDING

MediaTek Foo Bar Padding

Please explain what is this. PADDING does not look like acronym. If it
is, expand it.

> +
> +maintainers:
> +  - Chun-Kuang Hu <chunkuang.hu@...nel.org>
> +  - Philipp Zabel <p.zabel@...gutronix.de>
> +
> +description:
> +  MediaTek PADDING provides ability to VDOSYS1 to add pixels to width and height

Expand the acronym.

> +  of a layer with a specified color.
> +  Since MIXER in VDOSYS1 requires the width of a layer to be 2-pixel-align, or
> +  4-pixel-align when ETHDR is enabled, we need PADDING to deal with odd width.
> +  Please notice that even if the PADDING is in bypass mode, settings in the
> +  registers must be cleared to 0, or undefined behaviors could happen.
> +
> +properties:
> +  compatible:
> +    const: mediatek,mt8188-padding
> +
> +  reg:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: RDMA Clock
> +
> +  mediatek,gce-client-reg:
> +    description:
> +      GCE (Global Command Engine) is a multi-core micro processor that helps
> +      its clients to execute commands without interrupting CPU. This property
> +      describes GCE client's information that is composed by 4 fields.
> +      1. pHandle of the GCE (there may be several GCE processors)
> +      2. Sub-system ID defined in the dt-binding like a user ID
> +         (Please refer to include/dt-bindings/gce/<chip>-gce.h)
> +      3. Offset from base address of the subsys you are at
> +      4. Size of the register the client needs
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    items:
> +      items:
> +        - description: pHandle of the GCE

Phandle (if first in sentence) or phandle. It's not a pH unit. Fix it in
other places as well.


> +        - description: Subsys ID defined in the dt-binding
> +        - description: Offset from base address of the subsys
> +        - description: Size of register


Best regards,
Krzysztof