linux-kernel - Re: [PATCH v7 0/2] Resolve MPM register space situation

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Message-ID: <87il58sr12.ffs@tglx>
Date:   Fri, 08 Dec 2023 15:33:13 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawn.guo@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH v7 0/2] Resolve MPM register space situation

Konrad!

On Mon, Nov 27 2023 at 16:52, Konrad Dybcio wrote:

This list of version changes is useful, but seriously not on top of the
cover letter. It makes me scroll down 60 lines to find the real meat.

<SNIP>

> Depends on resolution of https://github.com/devicetree-org/dt-schema/issues/104

Is this resolved? I can't figure out from this non-format whether this
belongs to V1 or to the actual cover letter...

> The MPM (and some other things, irrelevant to this patchset) resides
> (as far as the ARM cores are concerned, anyway) in a MMIO-mapped region
> that's a portion of the RPM (low-power management core)'s RAM, known
> as the RPM Message RAM. Representing this relation in the Device Tree
> creates some challenges, as one would either have to treat a memory
> region as a bus, map nodes in a way such that their reg-s would be
> overlapping, or supply the nodes with a slice of that region.
>
> This series implements the third option, by adding a qcom,rpm-msg-ram
> property, which has been used for some drivers poking into this region
> before. Bindings ABI compatibility is preserved through keeping the
> "normal" (a.k.a read the reg property and map that region) way of
> passing the register space.
>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Signed-off-by on the cover letter is completely meaningless.

Thanks,

        tglx