linux-kernel - Re: [PATCH v6 05/16] dt-bindings: media: mediatek: mdp3: add support MT8195 RDMA

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Message-ID: <20230922-squealing-tipoff-e2fc6117ba7e@spud>
Date:   Fri, 22 Sep 2023 16:46:48 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Moudy Ho <moudy.ho@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 05/16] dt-bindings: media: mediatek: mdp3: add support
 MT8195 RDMA

On Fri, Sep 22, 2023 at 03:21:05PM +0800, Moudy Ho wrote:
> Support for MT8195 RDMA has been added, allowing for
> the configuration of multiple MDP3 pipes.
> Furthermore, this particular device does not require
> sharing SRAM with RSZ.

I'm sorry if I am going over past arguments, if this is 90% the same as
the 8193 rdma, why the extraction + mostly duplicate file, rather than
covering whatever clocks/mboxes differences with an if/then/else in a
single file?

Thanks,
Conor.

> 
> Signed-off-by: Moudy Ho <moudy.ho@...iatek.com>
> ---
>  .../media/mediatek,mdp3-rdma-8195.yaml        | 64 +++++++++++++++++++
>  1 file changed, 64 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/mediatek,mdp3-rdma-8195.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma-8195.yaml b/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma-8195.yaml
> new file mode 100644
> index 000000000000..f10139aec3c5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/mediatek,mdp3-rdma-8195.yaml
> @@ -0,0 +1,64 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/mediatek,mdp3-rdma-8195.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek MT8195 Read Direct Memory Access
> +
> +maintainers:
> +  - Matthias Brugger <matthias.bgg@...il.com>
> +  - Moudy Ho <moudy.ho@...iatek.com>
> +
> +description: |
> +  MediaTek Read Direct Memory Access(RDMA) component used to do read DMA.
> +  This type of component is configured when there are multiple MDP3 pipelines
> +  that belong to different MMSYS subsystems.
> +  It contains one line buffer to store the sufficient pixel data, and
> +  must be siblings to the central MMSYS_CONFIG node.
> +  For a description of the MMSYS_CONFIG binding, see
> +  Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> +  for details.
> +
> +allOf:
> +  - $ref: mediatek,mdp3-rdma-common.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: mediatek,mt8195-mdp3-rdma
> +
> +  clocks:
> +    maxItems: 1
> +
> +  mboxes:
> +    maxItems: 5
> +
> +required:
> +  - compatible
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/mt8195-clk.h>
> +    #include <dt-bindings/gce/mt8195-gce.h>
> +    #include <dt-bindings/power/mt8195-power.h>
> +    #include <dt-bindings/memory/mt8195-memory-port.h>
> +
> +    dma-controller@...01000 {
> +        compatible = "mediatek,mt8195-mdp3-rdma";
> +        reg = <0x14001000 0x1000>;
> +        mediatek,gce-client-reg = <&gce1 SUBSYS_1400XXXX 0x1000 0x1000>;
> +        mediatek,gce-events = <CMDQ_EVENT_VPP0_MDP_RDMA_SOF>,
> +                              <CMDQ_EVENT_VPP0_MDP_RDMA_FRAME_DONE>;
> +        power-domains = <&spm MT8195_POWER_DOMAIN_VPPSYS0>;
> +        iommus = <&iommu_vpp M4U_PORT_L4_MDP_RDMA>;
> +        clocks = <&vppsys0 CLK_VPP0_MDP_RDMA>;
> +        mboxes = <&gce1 12 CMDQ_THR_PRIO_1>,
> +                 <&gce1 13 CMDQ_THR_PRIO_1>,
> +                 <&gce1 14 CMDQ_THR_PRIO_1>,
> +                 <&gce1 21 CMDQ_THR_PRIO_1>,
> +                 <&gce1 22 CMDQ_THR_PRIO_1>;
> +        #dma-cells = <1>;
> +    };
> -- 
> 2.18.0
> 

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