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 11:24:05 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     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@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 01/10] arm64: dts: qcom: sdm845: Update PIL region
 memory map

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.

Regards,
Bjorn