linux-kernel - Re: [PATCH v9 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2 variant

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Date:   Tue, 10 Apr 2018 13:14:57 +0000
From:   Tomasz Figa <tfiga@...omium.org>
To:     xieyisheng1@...wei.com
Cc:     Vivek Gautam <vivek.gautam@...eaurora.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Will Deacon <will.deacon@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <iommu@...ts.linux-foundation.org>,
        gaojianbo@...ilicon.com
Subject: Re: [PATCH v9 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2 variant

Hi Yisheng,

Sorry, I think we missed your question here.

On Wed, Mar 28, 2018 at 3:12 PM Yisheng Xie <xieyisheng1@...wei.com> wrote:

> Hi Vivek,

> On 2018/3/28 12:37, Vivek Gautam wrote:
> > Hi Yisheng
> >
> >
> > On 3/28/2018 6:54 AM, Yisheng Xie wrote:
> >> Hi Vivek,
> >>
> >> On 2018/3/13 16:55, Vivek Gautam wrote:
> >>> +- power-domains:  Specifiers for power domains required to be
powered on for
> >>> +                  the SMMU to operate, as per generic power domain
bindings.
> >>> +
> >> In this patchset, power-domains is not used right? And you just do the
clock gating,
> >> but not power gating, right?
> >
> > We are handling the power-domains too. Please see the example in this
binding doc.

> I see, but I do not find the point in code of these patchset, do you mean
PMIC(e.g mmcc)
> will gate the power domain of SMMU(e.g. MDSS_GDSC of mmcc) when PMIC
suspend?


If respective SoC power domains is registered as a standard genpd PM
domain, then the runtime PM subsystem will take care of power domain
control at runtime suspend and resume.

Best regards,
Tomasz