linux-kernel - Re: [PATCH v4 0/2] Resolve MPM register space situation

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Date:   Thu, 20 Jul 2023 20:18:06 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        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
Subject: Re: [PATCH v4 0/2] Resolve MPM register space situation

On 18.07.2023 20:07, Dmitry Baryshkov wrote:
> On 18/07/2023 15:19, Konrad Dybcio wrote:
>> v3 -> v4:
>> - Fix up indentation in the bindings patch
>> - Add an example glink-edge subnode to remoteproc-rpm (its bindings
>>    require that..)
>>
>> Link to v3: https://lore.kernel.org/r/20230328-topic-msgram_mpm-v3-0-2c72f27b4706@linaro.org
>>
>> v2 -> v3:
>> - Fix the example
>> - Pick up tags
>> - remove the outdated example from the cover letter, check bindings
>>    should you want to see one
>>
>> The bindings for the wrapper node used in the yaml example are merged
>> in qcom/for-next
>>
>> Link to v2: https://lore.kernel.org/r/20230328-topic-msgram_mpm-v2-0-e24a48e57f0d@linaro.org
>>
>> v1 -> v2:
>> - deprecate 'reg', make qcom,rpm-msg-ram required [1/2]
>> - Use devm_ioremap() [2/2]
>>
>> Link to v1: https://lore.kernel.org/r/20230328-topic-msgram_mpm-v1-0-1b788a5f5a33@linaro.org
>>
>> Depends on resolution of https://github.com/devicetree-org/dt-schema/issues/104
>>
>> 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.
> 
> This almost bleeds to have some uniformity with qcom,rpm-stats (and with the boot stats). All these drivers provides us with the insight into the RPM memory.
RPM master stats - yes, it should be moved under this node.

The other stats - I don't yet know.

Konrad