linux-kernel - Re: [PATCH 3/5] arm64: dts: mt8192: Add display nodes

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Date:   Wed, 29 Jun 2022 19:24:29 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Allen-KH Cheng <allen-kh.cheng@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        Chen-Yu Tsai <wenst@...omium.org>
Subject: Re: [PATCH 3/5] arm64: dts: mt8192: Add display nodes

On Wed, Jun 29, 2022 at 08:13:56PM +0800, Allen-KH Cheng wrote:
> Add display nodes and gce info for mt8192 SoC.
> 
> GCE (Global Command Engine) properties to the display nodes in order to
> enable the usage of the CMDQ (Command Queue), which is required for
> operating the display.
> 
> Signed-off-by: Allen-KH Cheng <allen-kh.cheng@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  arch/arm64/boot/dts/mediatek/mt8192.dtsi | 136 +++++++++++++++++++++++
>  1 file changed, 136 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8192.dtsi b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> index a07edc82d403..26d01544b4ea 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
[..]
>  
> +		mutex: mutex@...01000 {
> +			compatible = "mediatek,mt8192-disp-mutex";
> +			reg = <0 0x14001000 0 0x1000>;
> +			interrupts = <GIC_SPI 252 IRQ_TYPE_LEVEL_HIGH 0>;
> +			clocks = <&mmsys CLK_MM_DISP_MUTEX0>;
> +			mediatek,gce-events = <CMDQ_EVENT_DISP_STREAM_DONE_ENG_EVENT_0>,
> +					      <CMDQ_EVENT_DISP_STREAM_DONE_ENG_EVENT_1>;

This node is missing power-domains.

> +		};
> +
[..]
> +		rdma0: rdma@...07000 {
> +			compatible = "mediatek,mt8192-disp-rdma";

dtbs_check is complaining that there isn't a "mediatek,mt8183-disp-rdma"
fallback compatible here. But given that the rdma driver matches directly to the
mt8192 compatible, I think the node here is fine, and the binding is the one
that should be updated.

> +			reg = <0 0x14007000 0 0x1000>;
> +			interrupts = <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH 0>;
> +			clocks = <&mmsys CLK_MM_DISP_RDMA0>;
> +			iommus = <&iommu0 M4U_PORT_L0_DISP_RDMA0>;
> +			mediatek,larb = <&larb0>;

mediatek,larb is no longer used, so drop it.

Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Thanks,
Nícolas