linux-kernel - Re: [Patch v2 4/4] arm64: tegra: Add GPCDMA node in dt

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Date:   Fri, 7 Aug 2020 17:26:19 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Rajesh Gumasta <rgumasta@...dia.com>, <ldewangan@...dia.com>,
        <vkoul@...nel.org>, <dan.j.williams@...el.com>,
        <thierry.reding@...il.com>, <p.zabel@...gutronix.de>,
        <dmaengine@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <kyarlagadda@...dia.com>
Subject: Re: [Patch v2 4/4] arm64: tegra: Add GPCDMA node in dt


On 06/08/2020 08:30, Rajesh Gumasta wrote:
> Add device tree node for GPCDMA controller on Tegra186 target
> and Tegra194 target.
> 
> Signed-off-by: Rajesh Gumasta <rgumasta@...dia.com>
> ---
>  arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi |  4 +++
>  arch/arm64/boot/dts/nvidia/tegra186.dtsi       | 46 ++++++++++++++++++++++++++
>  arch/arm64/boot/dts/nvidia/tegra194.dtsi       | 44 ++++++++++++++++++++++++
>  3 files changed, 94 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi b/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
> index 2fcaa2e..56ed8d8 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra186-p3310.dtsi
> @@ -54,6 +54,10 @@
>  		};
>  	};
>  
> +	dma@...0000 {
> +		status = "okay";
> +	};
> +
>  	memory-controller@...0000 {
>  		status = "okay";
>  	};
> diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
> index 58100fb..91bb17e 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
> @@ -70,6 +70,52 @@
>  		snps,rxpbl = <8>;
>  	};
>  
> +	gpcdma: dma@...0000 {
> +			compatible = "nvidia,tegra186-gpcdma";
> +			reg = <0x0 0x2600000 0x0 0x210000>;
> +			resets = <&bpmp TEGRA186_RESET_GPCDMA>;
> +			reset-names = "gpcdma";
> +			interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 84 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 86 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 87 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 88 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 94 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 102 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH>,
> +				      <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
> +			#dma-cells = <1>;
> +			iommus = <&smmu TEGRA186_SID_GPCDMA_0>;
> +			dma-coherent;
> +			nvidia,start-dma-channel-index = <1>;
> +			dma-channels = <31>;

The above two properties are not mentioned in the dt-binding doc. I
really don't think we want these, especially the first as this is not
describing the h/w.

Jon

-- 
nvpublic