linux-kernel - Re: [RESEND v3 01/13] dt-binding: mediatek: add bindings for MediaTek mt8195 MDP3 components

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Date:   Mon, 16 Jan 2023 09:10:07 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Moudy Ho <moudy.ho@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.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
Subject: Re: [RESEND v3 01/13] dt-binding: mediatek: add bindings for MediaTek
 mt8195 MDP3 components

On 16/01/2023 04:21, Moudy Ho wrote:
> This patch adds support for MT8195 MDP3 RDMA, and introduce more
> MDP3 components present in MT8195.

Do not use "This commit/patch".
https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95

Subject: drop second/last, redundant "bindings for". The "dt-bindings"
prefix is already stating that these are bindings.

> 
> Signed-off-by: Moudy Ho <moudy.ho@...iatek.com>
> ---
>  .../bindings/media/mediatek,mdp3-aal.yaml     | 63 ++++++++++++++++
>  .../bindings/media/mediatek,mdp3-color.yaml   | 63 ++++++++++++++++
>  .../bindings/media/mediatek,mdp3-fg.yaml      | 63 ++++++++++++++++
>  .../bindings/media/mediatek,mdp3-hdr.yaml     | 62 +++++++++++++++
>  .../bindings/media/mediatek,mdp3-merge.yaml   | 63 ++++++++++++++++
>  .../bindings/media/mediatek,mdp3-ovl.yaml     | 63 ++++++++++++++++
>  .../bindings/media/mediatek,mdp3-pad.yaml     | 63 ++++++++++++++++
>  .../bindings/media/mediatek,mdp3-rdma.yaml    | 30 +++++---
>  .../bindings/media/mediatek,mdp3-rsz.yaml     | 11 ++-
>  .../bindings/media/mediatek,mdp3-split.yaml   | 75 +++++++++++++++++++
>  .../bindings/media/mediatek,mdp3-stitch.yaml  | 63 ++++++++++++++++
>  .../bindings/media/mediatek,mdp3-tcc.yaml     | 62 +++++++++++++++
>  .../bindings/media/mediatek,mdp3-tdshp.yaml   | 63 ++++++++++++++++
>  13 files changed, 731 insertions(+), 13 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-aal.yaml
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-color.yaml
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-fg.yaml
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-hdr.yaml
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-merge.yaml
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-ovl.yaml
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-pad.yaml
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-split.yaml
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-stitch.yaml
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-tcc.yaml
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-tdshp.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/mediatek,mdp3-aal.yaml b/Documentation/devicetree/bindings/media/mediatek,mdp3-aal.yaml
> new file mode 100644
> index 000000000000..d2e1b5245778
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/mediatek,mdp3-aal.yaml

Filename should match compatible, unless you already expect this binding
will cover other devices. If so, why not adding them now?

> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/mediatek,mdp3-aal.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek Media Data Path 3 AAL
> +
> +maintainers:
> +  - Matthias Brugger <matthias.bgg@...il.com>
> +  - Moudy Ho <moudy.ho@...iatek.com>
> +
> +description:
> +  One of Media Data Path 3 (MDP3) components is responsible for backlight
> +  power saving and sunlight visibility improving.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt8195-mdp3-aal
> +
> +  reg:
> +    maxItems: 1
> +
> +  mediatek,gce-client-reg:
> +    description:
> +      The register of client driver can be configured by gce with 4 arguments
> +      defined in this property, such as phandle of gce, subsys id,
> +      register offset and size.
> +      Each subsys id is mapping to a base address of display function blocks
> +      register which is defined in the gce header
> +      include/dt-bindings/gce/<chip>-gce.h.
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    maxItems: 1

items with items syntax instead:

https://elixir.bootlin.com/linux/v5.18-rc1/source/Documentation/devicetree/bindings/soc/samsung/exynos-usi.yaml#L42

> +
> +  clocks:
> +    minItems: 1

Nope, maxItems.

> +
> +  power-domains:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - mediatek,gce-client-reg
> +  - clocks
> +  - power-domains
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/mt8195-clk.h>
> +    #include <dt-bindings/gce/mt8195-gce.h>
> +    #include <dt-bindings/power/mt8195-power.h>
> +
> +    mdp3-aal0@...05000 {

Node names should be generic.
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

Definitelly "3" and "0" are not generic suffixes.

All comments above apply to your other files here.

> +        compatible = "mediatek,mt8195-mdp3-aal";
> +        reg = <0x14005000 0x1000>;
> +        mediatek,gce-client-reg = <&gce1 SUBSYS_1400XXXX 0x5000 0x1000>;
> +        clocks = <&vppsys0 CLK_VPP0_MDP_AAL>;
> +        power-domains = <&spm MT8195_POWER_DOMAIN_VPPSYS0>;
> +    };
> diff --git a/Documentation/devicetree/bindings/media/mediatek,mdp3-color.yaml b/Documentation/devicetree/bindings/media/mediatek,mdp3-color.yaml
> new file mode 100644
> index 000000000000..1d8aa5dc76b9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/mediatek,mdp3-color.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/mediatek,mdp3-color.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek Media Data Path 3 COLOR
> +
> +maintainers:
> +  - Matthias Brugger <matthias.bgg@...il.com>
> +  - Moudy Ho <moudy.ho@...iatek.com>
> +
> +description:
> +  One of Media Data Path 3 (MDP3) components used to adjust hue, luma and
> +  saturation to get better picture quality.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt8195-mdp3-color

This is exactly the same as previous file. Why do you split the binding?
It really looks unnecessary.

Probably all other files should be also squashed.

> +
> +  reg:
> +    maxItems: 1
> +
> +  mediatek,gce-client-reg:
> +    description:
> +      The register of client driver can be configured by gce with 4 arguments
> +      defined in this property, such as phandle of gce, subsys id,
> +      register offset and size.
> +      Each subsys id is mapping to a base address of display function blocks
> +      register which is defined in the gce header
> +      include/dt-bindings/gce/<chip>-gce.h.

Full, real path please, so it could be validated with tools.


Best regards,
Krzysztof