linux-kernel - Re: [PATCH 2/5] arm64: dts: qcom: sm6115: Add Crypto Engine support

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Date:   Tue, 21 Mar 2023 21:38:36 +0100
From:   Stephan Gerhold <stephan@...hold.net>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, agross@...nel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        andersson@...nel.org, bhupesh.linux@...il.com,
        krzysztof.kozlowski@...aro.org, robh+dt@...nel.org,
        konrad.dybcio@...aro.org, vladimir.zapolskiy@...aro.org,
        rfoss@...nel.org
Subject: Re: [PATCH 2/5] arm64: dts: qcom: sm6115: Add Crypto Engine support

On Wed, Mar 22, 2023 at 12:31:15AM +0530, Bhupesh Sharma wrote:
> Add crypto engine (CE) and CE BAM related nodes and definitions to
> 'sm6115.dtsi'.
> 
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sm6115.dtsi | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm6115.dtsi b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> index c56738633431..b2d2cdde41fa 100644
> --- a/arch/arm64/boot/dts/qcom/sm6115.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm6115.dtsi
> @@ -664,6 +664,32 @@ usb_1_hsphy: phy@...3000 {
>  			status = "disabled";
>  		};
>  
> +		cryptobam: dma-controller@...4000 {
> +			compatible = "qcom,bam-v1.7.4", "qcom,bam-v1.7.0";
> +			reg = <0x0 0x01b04000 0x0 0x24000>;
> +			interrupts = <GIC_SPI 247 IRQ_TYPE_LEVEL_HIGH>;
> +			#dma-cells = <1>;
> +			qcom,ee = <0>;
> +			qcom,controlled-remotely;
> +			num-channels = <8>;
> +			qcom,num-ees = <2>;
> +			iommus = <&apps_smmu 0x84 0x11>,
> +				 <&apps_smmu 0x86 0x11>,
> +				 <&apps_smmu 0x94 0x11>,
> +				 <&apps_smmu 0x96 0x11>;
> +		};
> +
> +		crypto: crypto@...a000 {
> +			compatible = "qcom,sm6115-qce", "qcom,sm8150-qce", "qcom,qce";
> +			reg = <0x0 0x01b3a000 0x0 0x6000>;
> +			dmas = <&cryptobam 6>, <&cryptobam 7>;
> +			dma-names = "rx", "tx";
> +			iommus = <&apps_smmu 0x84 0x11>,
> +				 <&apps_smmu 0x86 0x11>,
> +				 <&apps_smmu 0x94 0x11>,
> +				 <&apps_smmu 0x96 0x11>;

If you apply the 0x11 mask to the stream ID then the last two items here
are identical to the first two (0x94 & ~0x11 = 0x84). Why are they
needed? They look redundant to me.

Thanks,
Stephan