linux-kernel - Re: [PATCH v18 1/5] iommu/arm-smmu: Add pm

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Message-ID: <154388067496.88331.314679235652159449@swboyd.mtv.corp.google.com>
Date:   Mon, 03 Dec 2018 15:44:34 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>,
        Will Deacon <will.deacon@....com>
Cc:     Robin Murphy <robin.murphy@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>, " <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>, robh+dt <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        open list <linux-kernel@...r.kernel.org>,
        alex.williamson@...hat.com,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>
Subject: Re: [PATCH v18 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops

Quoting Vivek Gautam (2018-12-02 22:43:38)
> On Fri, Nov 30, 2018 at 11:45 PM Will Deacon <will.deacon@....com> wrote:
> >
> > On Thu, Nov 29, 2018 at 08:25:20PM +0530, Vivek Gautam wrote:
> > > clk_bulk_get_all() seems like going only the OF way.
> > > Is there another way here to have something common between ACPI
> > > and OF, and then do the clk_bulk_get?
> >
> > I'd say just go with clk_bulk_get_all() and if somebody really wants to
> > mess with the SMMU clocks on a system booted via ACPI, then it's their
> > problem to solve. My understanding is that the design of IORT makes this
> > next to impossible to solve anyway, because a static table is used and
> > therefore we're unable to run whatever ASL methods need to be invoked to
> > mess with the clocks.
> 
> Sure then. I will respin this patch-series.
> 

Right. The idea is to add non-OF support to clk_bulk_get_all() if/when
we get the requirement. Sounds like we can keep waiting a little longer
for that to happen.