linux-kernel - Re: [PATCH v3 02/10] arm64: dts: qcom: sdm845: Define rmtfs memory

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Message-ID: <20190123004742.GH31919@minitux>
Date:   Tue, 22 Jan 2019 16:47:42 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Doug Anderson <dianders@...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 <linux-arm-msm@...r.kernel.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Evan Green <evgreen@...omium.org>,
        Ben Chan <benchan@...gle.com>,
        Brian Norris <briannorris@...omium.org>
Subject: Re: [PATCH v3 02/10] arm64: dts: qcom: sdm845: Define rmtfs memory

On Tue 22 Jan 15:26 PST 2019, Doug Anderson wrote:

> Hi,
> 
> On Mon, Jan 21, 2019 at 9:51 PM Bjorn Andersson
> <bjorn.andersson@...aro.org> wrote:
> >
> > Define the rmtfs memory node, as described in version 10 of the memory
> > map.
> >
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> >
> > Changes since v2:
> > - New patch
> >
> >  arch/arm64/boot/dts/qcom/sdm845.dtsi | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > index cdcac3704c13..64f57cc5c61a 100644
> > --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > @@ -72,6 +72,15 @@
> >                 #size-cells = <2>;
> >                 ranges;
> >
> > +               rmtfs@...00000 {
> > +                       compatible = "qcom,rmtfs-mem";
> > +                       reg = <0 0x85d00000 0 0x200000>;
> > +                       no-map;
> > +
> > +                       qcom,client-id = <1>;
> > +                       qcom,vmid = <15>;
> > +               };
> 
> Ah, I saw this after I posted my comments to patch #1.  I guess this
> is the same as this node we have in our cheza board file downstream
> (need to get that posted upstream soon):
> 
> rmtfs@...00000 {
>   compatible = "qcom,rmtfs-mem";
>   reg = <0x0 0x88f00000 0x0 0x800000>;
>   no-map;
> 
>   qcom,client-id = <1>;
> };
> 
> That brings up a few things:
> 
> 1. You should add a node label here.  This allows us to act on the
> node more easily from board files, like setting it to disabled or
> changing it.
> 

I'll make sure to label it.

> 2. In https://crrev.com/c/1119572, the argument was made that the size
> of this carveout is board-specific.  That makes it hard to put it in
> sdm845.dts.
> 

I don't think I've seen a modern platform where this isn't 2MB, so I
think it's safe to add it to the platform. But a label sounds good, if
someone out there has a custom modem firmware with some odd changes in
this area.

I'll label it, to make it possible to move, resize or reclaim in boards.

Regards,
Bjorn