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

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Message-ID: <CAD=FV=X0x4hQ=8yQ6wDWE8ximf9A8hpgpRWTdPrFXDD4FVO8VQ@mail.gmail.com>
Date:   Tue, 22 Jan 2019 15:26:22 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.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

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.

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.


-Doug