linux-kernel - Re: [PATCH 1/3] dts: arm64/sdm845: Add node for arm,mmu-500

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Date:   Thu, 19 Jul 2018 17:08:31 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Andy Gross <andy.gross@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Tomasz Figa <tfiga@...omium.org>,
        Sricharan <sricharan@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        David Brown <david.brown@...aro.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/3] dts: arm64/sdm845: Add node for arm,mmu-500

On Thu, Jul 19, 2018 at 11:54 AM Vivek Gautam
<vivek.gautam@...eaurora.org> wrote:
>
> Add device node for arm,mmu-500 available on sdm845.
> This MMU-500 with single TCU and multiple TBU architecture
> is shared among all the peripherals except gpu on sdm845.
>
> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/sdm845-mtp.dts |  4 ++
>  arch/arm64/boot/dts/qcom/sdm845.dtsi    | 73 +++++++++++++++++++++++++++++++++
>  2 files changed, 77 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-mtp.dts b/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
> index 6d651f314193..13b50dff440f 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
> +++ b/arch/arm64/boot/dts/qcom/sdm845-mtp.dts
> @@ -58,3 +58,7 @@
>                 bias-pull-up;
>         };
>  };
> +
> +&apps_smmu {
> +       status = "okay";
> +};
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 00722b533a92..70ca18ae6cb3 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -980,6 +980,79 @@
>                         cell-index = <0>;
>                 };
>
> +               apps_smmu: arm,smmu@...00000 {

iommu@...

> +                       compatible = "arm,mmu-500";

Really unmodified by QCom? Would be better to have SoC specific compatible.

Rob