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

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Message-ID: <CAFp+6iEC8hobAdVF5nLdhQdCUqbi1xa4Vi-NLugGshV=dg+h1A@mail.gmail.com>
Date:   Thu, 29 Nov 2018 20:25:20 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     sboyd@...nel.org,
        "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>,
        Will Deacon <will.deacon@....com>,
        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

On Wed, Nov 28, 2018 at 10:07 PM Robin Murphy <robin.murphy@....com> wrote:
>
> On 28/11/2018 16:24, Stephen Boyd wrote:
> > Quoting Vivek Gautam (2018-11-27 02:11:41)
> >> @@ -1966,6 +1970,23 @@ static const struct of_device_id arm_smmu_of_match[] = {
> >>   };
> >>   MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
> >>
> >> +static void arm_smmu_fill_clk_data(struct arm_smmu_device *smmu,
> >> +                                  const char * const *clks)
> >> +{
> >> +       int i;
> >> +
> >> +       if (smmu->num_clks < 1)
> >> +               return;
> >> +
> >> +       smmu->clks = devm_kcalloc(smmu->dev, smmu->num_clks,
> >> +                                 sizeof(*smmu->clks), GFP_KERNEL);
> >> +       if (!smmu->clks)
> >> +               return;
> >> +
> >> +       for (i = 0; i < smmu->num_clks; i++)
> >> +               smmu->clks[i].id = clks[i];
> >
> > Is this clk_bulk_get_all()?

>From what I remember, and now I could go back to v7 and check [1], we parked
clk_bulk_get out of OF's sole purview as we also have
arm_smmu_device_acpi_probe() besides arm_smmu_device_dt_probe().

arm_smmu_device_dt_probe() could get the clocks from dt and fill in
the clock bulk data, and
similarly, arm_smmu_device_acpi_probe() could fill the clock bulk data
by getting it from ACPI.

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?

[1] https://lore.kernel.org/patchwork/patch/881365/

Thanks & regards
Vivek

>
> Ooh, did that finally get merged while we weren't looking? Great!
>
> Much as I don't want to drag this series out to a v19, it *would* be
> neat if we no longer need to open-code that bit...
>
> Robin.
> _______________________________________________
> iommu mailing list
> iommu@...ts.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu

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