linux-kernel - Re: [PATCH v2 3/3] dts: arm64/sdm845: Add node for qcom,smmu-v2

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Message-ID: <f8d638bd-d0cb-e03d-bac2-3bc2e30c5422@codeaurora.org>
Date:   Mon, 27 Aug 2018 14:26:21 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Robin Murphy <robin.murphy@....com>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Joerg Roedel <joro@...tes.org>,
        Andy Gross <andy.gross@...aro.org>,
        Will Deacon <will.deacon@....com>,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Mark Rutland <mark.rutland@....com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 3/3] dts: arm64/sdm845: Add node for qcom,smmu-v2

Hi Rob, Robin,


On 8/15/2018 4:27 AM, Rob Herring wrote:
> On Wed, Aug 15, 2018 at 01:09:43AM +0530, Vivek Gautam wrote:
>> Adding Jordan here.
>>
>> On Tue, Aug 14, 2018 at 4:19 PM, Robin Murphy <robin.murphy@....com> wrote:
>>> Hi Vivek,
>>>
>>> On 14/08/18 11:27, Vivek Gautam wrote:
>>>> Add device node for qcom,smmu-v2 available on sdm845.
>>>> This smmu is available only to GPU device.
>>>>
>>>> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
>>>> ---
>>>>    arch/arm64/boot/dts/qcom/sdm845.dtsi | 23 +++++++++++++++++++++++
>>>>    1 file changed, 23 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>>> b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>>> index 1c2be2082f33..bd1ec5fa5146 100644
>>>> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>>> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>>>> @@ -6,6 +6,7 @@
>>>>     */
>>>>      #include <dt-bindings/clock/qcom,gcc-sdm845.h>
>>>> +#include <dt-bindings/clock/qcom,gpucc-sdm845.h>
>>>>    #include <dt-bindings/clock/qcom,rpmh.h>
>>>>    #include <dt-bindings/interrupt-controller/arm-gic.h>
>>>>    #include <dt-bindings/soc/qcom,rpmh-rsc.h>
>>>> @@ -989,6 +990,28 @@
>>>>                          cell-index = <0>;
>>>>                  };
>>>>    +             gpu_smmu: iommu@...0000 {
>>>> +                       compatible = "qcom,sdm845-smmu-v2",
>>>> "qcom,smmu-v2";
>>>
>>> Which of "sdm845" or "msm8996"[1] is the actual SoC name here?
>> Well, the bindings use the SoC prefix with smmu-v2, so it should be
>> sdm845 for this SoC. This is same as I posted in my v1 of the series [2].
>> Using 8996 based string in sdm845 makes things look awful.
> You need to list valid values of '<soc>' in the binding. Otherwise we
> get this confusion.

Sorry for delayed response, I was away on vacation.
I will list down the valid values for '<soc>' as suggested, and respin 
this series, and
smmu bindings patch that comes as part of the runtime pm series [1].

[1] https://lore.kernel.org/patchwork/patch/968017/

Best regards
Vivek

>
> Rob