linux-kernel - Re: [PATCH v3 01/10] arm64: dts: qcom: sdm845: Update PIL region memory map

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Date:   Tue, 22 Jan 2019 15:10:49 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 01/10] arm64: dts: qcom: sdm845: Update PIL region
 memory map

Hi,

On Tue, Jan 22, 2019 at 11:24 AM Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> On Tue 22 Jan 10:58 PST 2019, Stephen Boyd wrote:
>
> > Quoting Bjorn Andersson (2019-01-21 21:51:03)
> > > @@ -103,10 +138,30 @@
> > >                         no-map;
> > >                 };
> > >
> > > +               venus_mem: memory@...00000 {
> > > +                       reg = <0 0x95800000 0 0x500000>;
> > > +                       no-map;
> > > +               };
> > > +
> > > +               cdsp_mem: memory@...00000 {
> > > +                       reg = <0 0x95d00000 0 0x800000>;
> > > +                       no-map;
> > > +               };
> > > +
> > >                 mba_region: memory@...00000 {
> > >                         reg = <0 0x96500000 0 0x200000>;
> > >                         no-map;
> > >                 };
> > > +
> > > +               slpi_mem: memory@...00000 {
> > > +                       reg = <0 0x96700000 0 0x1400000>;
> > > +                       no-map;
> > > +               };
> > > +
> > > +               spss_mem: memory@...00000 {
> > > +                       reg = <0 0x97b00000 0 0x100000>;
> > > +                       no-map;
> > > +               };
> > >         };
> > >
> >
> > What's the plan if certain configurations don't use all these carveouts?
> > Can we mark the reservation nodes as status = "disabled", or the reverse
> > and mark them as status = "ok" in all boards, and then reclaim the
> > memory for peripherals we don't care to use?
> >
>
> The code path that picks these up does look for "status", so I suggest
> that we leave them all enabled in the platform dtsi and then let the
> device's reclaim them as needed.

Does that mean we should add labels for all of the sub-nodes so that
boards can easily mark them "disabled"?

-Doug