linux-kernel - Re: [PATCH RFC 1/2] arm64: dts: qcom: msm8953: Add GPU IOMMU

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Date: Fri, 26 Jan 2024 00:49:55 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Luca Weiss <luca@...tu.xyz>, ~postmarketos/upstreaming@...ts.sr.ht,
 phone-devel@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Vladimir Lypak <vladimir.lypak@...il.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/2] arm64: dts: qcom: msm8953: Add GPU IOMMU



On 1/25/24 23:24, Dmitry Baryshkov wrote:
> On 25/01/2024 23:56, Luca Weiss wrote:
>> From: Vladimir Lypak <vladimir.lypak@...il.com>
>>
>> Add the IOMMU used for the GPU on MSM8953.
>>
>> Signed-off-by: Vladimir Lypak <vladimir.lypak@...il.com>
>> ---
>>   arch/arm64/boot/dts/qcom/msm8953.dtsi | 31 +++++++++++++++++++++++++++++++
>>   1 file changed, 31 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/msm8953.dtsi b/arch/arm64/boot/dts/qcom/msm8953.dtsi
>> index dcb5c98b793c..91d083871ab0 100644
>> --- a/arch/arm64/boot/dts/qcom/msm8953.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/msm8953.dtsi
>> @@ -1046,6 +1046,37 @@ mdss_dsi1_phy: phy@...6400 {
>>               };
>>           };
>> +        gpu_iommu: iommu@...8000 {
> 
> Nit: most of the platforms use the adreno_smmu label. But maybe the msm-iommu vs arm-smmu makes difference here.

Not really :)

Please keep the labels unified
> 
> Nevertheless:
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> 
>> +            compatible = "qcom,msm8953-iommu", "qcom,msm-iommu-v2";
>> +            ranges = <0 0x01c48000 0x8000>;
>> +
>> +            clocks = <&gcc GCC_OXILI_AHB_CLK>,
>> +                 <&gcc GCC_BIMC_GFX_CLK>;

And align these

Konrad