linux-kernel - Re: [RESEND PATCH v6 04/20] dt-bindings: display: mediatek: padding: Add MT8188

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Date:   Wed, 20 Sep 2023 06:16:31 +0000
From:   CK Hu (胡俊光) <ck.hu@...iatek.com>
To:     Shawn Sung (宋孝謙) 
        <Shawn.Sung@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Singo Chang (張興國) 
        <Singo.Chang@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>,
        Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "airlied@...il.com" <airlied@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "nfraprado@...labora.com" <nfraprado@...labora.com>
Subject: Re: [RESEND PATCH v6 04/20] dt-bindings: display: mediatek: padding:
 Add MT8188

Hi, Hsiao-chien:

On Mon, 2023-09-11 at 15:42 +0800, Hsiao Chien Sung wrote:
> Padding is a new hardware module on MediaTek MT8188,
> add dt-bindings for it.
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 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.y
> aml
> 
> 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..db24801ebc48
> --- /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 Display Padding
> +
> +maintainers:
> +  - Chun-Kuang Hu <chunkuang.hu@...nel.org>
> +  - Philipp Zabel <p.zabel@...gutronix.de>
> +
> +description:
> +  Padding provides ability to add pixels to width and height of a
> layer with
> +  specified colors. Due to hardware design, Mixer in VDOSYS1
> requires
> +  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
> +  register 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
> +        - description: Subsys ID defined in the dt-binding
> +        - description: Offset from base address of the subsys
> +        - description: Size of register
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - power-domains
> +  - clocks
> +  - mediatek,gce-client-reg

I think padding could work without gce. After drop this,

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/mediatek,mt8188-clk.h>
> +    #include <dt-bindings/power/mediatek,mt8188-power.h>
> +    #include <dt-bindings/gce/mt8195-gce.h>
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        padding0: padding@...1d000 {
> +            compatible = "mediatek,mt8188-padding";
> +            reg = <0 0x1c11d000 0 0x1000>;
> +            clocks = <&vdosys1 CLK_VDO1_PADDING0>;
> +            power-domains = <&spm MT8188_POWER_DOMAIN_VDOSYS1>;
> +            mediatek,gce-client-reg = <&gce0 SUBSYS_1c11XXXX 0xd000
> 0x1000>;
> +        };
> +    };
> --
> 2.18.0
>