linux-kernel - Re: [PATCH 6/7] arm64: tegra: Add DT node for T194 SMMU

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Date:   Fri, 30 Aug 2019 15:09:32 +0300
From:   Mikko Perttunen <cyndis@...si.fi>
To:     Krishna Reddy <vdumpa@...dia.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, treding@...dia.com, yhsu@...dia.com,
        snikam@...dia.com, praithatha@...dia.com, talho@...dia.com,
        avanbrunt@...dia.com, thomasz@...dia.com, olof@...om.net,
        jtukkinen@...dia.com, mperttunen@...dia.com
Subject: Re: [PATCH 6/7] arm64: tegra: Add DT node for T194 SMMU

On 30.8.2019 1.47, Krishna Reddy wrote:
> Add DT node for T194 SMMU to enable SMMU support.
> 
> Signed-off-by: Krishna Reddy <vdumpa@...dia.com>
> ---
>   arch/arm64/boot/dts/nvidia/tegra194.dtsi | 75 ++++++++++++++++++++++++++++++++
>   1 file changed, 75 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
> index d906958..ad509bb 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi
> @@ -1401,6 +1401,81 @@
>   			  0x82000000 0x0  0x40000000 0x1f 0x40000000 0x0 0xc0000000>; /* non-prefetchable memory (3GB) */
>   	};
>   
> +	smmu: iommu@...00000 {
> +		compatible = "nvidia,smmu-v2";

Should we have a compatibility string like "nvidia,tegra194-smmu" so 
that we can have other chips with SMMUv2 that could be different?

Mikko

> +		reg = <0 0x12000000 0 0x800000>,
> +		      <0 0x11000000 0 0x800000>,
> +		      <0 0x10000000 0 0x800000>;
> +		interrupts = <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 232 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 240 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>;
> +		stream-match-mask = <0x7f80>;
> +		#global-interrupts = <1>;
> +		#iommu-cells = <1>;
> +	};
> +
>   	sysram@...00000 {
>   		compatible = "nvidia,tegra194-sysram", "mmio-sram";
>   		reg = <0x0 0x40000000 0x0 0x50000>;
>