linux-kernel - Re: [PATCH 2/6] arm64: dts: qcom: sm8250: add apps

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Date:   Mon, 25 May 2020 15:12:21 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Jonathan Marek <jonathan@...ek.ca>
Cc:     linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH 2/6] arm64: dts: qcom: sm8250: add apps_smmu node

Hi Jonathan,

On 2020-05-24 08:08, Jonathan Marek wrote:
> Add the apps_smmu node for sm8250. Note that adding the iommus field 
> for
> UFS is required because initializing the iommu removes the bypass 
> mapping
> that created by the bootloader.
> 

This statement doesn't seem right, you can just say since the bypass is 
disabled
by default now, we need to add this property to enable translation and 
avoid global faults.

> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> ---
>  arch/arm64/boot/dts/qcom/sm8250.dtsi | 107 +++++++++++++++++++++++++++
>  1 file changed, 107 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi
> b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> index 2f99c350c287..43c5e48c15e2 100644
> --- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> @@ -323,6 +323,8 @@ ufs_mem_hc: ufshc@...4000 {
> 
>  			power-domains = <&gcc UFS_PHY_GDSC>;
> 
> +			iommus = <&apps_smmu 0x0e0 0>, <&apps_smmu 0x4e0 0>;
> +
>  			clock-names =
>  				"core_clk",
>  				"bus_aggr_clk",
> @@ -428,6 +430,111 @@ tlmm: pinctrl@...0000 {
>  			wakeup-parent = <&pdc>;
>  		};
> 
> +		apps_smmu: iommu@...00000 {
> +			compatible = "qcom,sdm845-smmu-500", "arm,mmu-500";

This should be qcom,sm8250-smmu-500 and also you need to update the 
arm-smmu
binding with this compatible in a separate patch.

-Sai

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