linux-kernel - Re: [PATCH 1/8] arm64: dts: qcom: msm8976: Add IOMMU nodes

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Date: Tue, 6 Feb 2024 20:08:26 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Adam Skladowski <a39.skl@...il.com>
Cc: phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
 Rob Clark <robdclark@...il.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Andy Gross <agross@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Krishna Manikandan <quic_mkrishn@...cinc.com>,
 linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] arm64: dts: qcom: msm8976: Add IOMMU nodes

On 21.01.2024 20:40, Adam Skladowski wrote:
> Add the nodes describing the apps and gpu iommu and its context banks
> that are found on msm8976 SoCs.
> 
> Signed-off-by: Adam Skladowski <a39.skl@...il.com>
> ---
>  arch/arm64/boot/dts/qcom/msm8976.dtsi | 80 +++++++++++++++++++++++++++
>  1 file changed, 80 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8976.dtsi b/arch/arm64/boot/dts/qcom/msm8976.dtsi
> index d2bb1ada361a..118174cfd4d3 100644
> --- a/arch/arm64/boot/dts/qcom/msm8976.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8976.dtsi
> @@ -808,6 +808,86 @@ tcsr: syscon@...7000 {
>  			reg = <0x01937000 0x30000>;
>  		};
>  
> +		apps_iommu: iommu@...0000 {
> +			compatible = "qcom,msm8976-iommu", "qcom,msm-iommu-v2";
> +			ranges  = <0 0x01e20000 0x20000>;

So.. there's no 'reg', does devm_platform_ioremap_resource() pick up
the corresponding reg space?

Konrad