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

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Date:   Tue, 18 Jul 2023 21:07:18 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...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 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 - remove the outdated example from the cover letter, check bindings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.

> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
> Konrad Dybcio (2):
>        dt-bindings: interrupt-controller: mpm: Pass MSG RAM slice through phandle
>        irqchip: irq-qcom-mpm: Support passing a slice of SRAM as reg space
> 
>   .../bindings/interrupt-controller/qcom,mpm.yaml    | 52 +++++++++++++++-------
>   drivers/irqchip/irq-qcom-mpm.c                     | 21 +++++++--
>   2 files changed, 53 insertions(+), 20 deletions(-)
> ---
> base-commit: aeba456828b4e47d99ec8ffb01412fbed0f94806
> change-id: 20230328-topic-msgram_mpm-c688be3bc294
> 
> Best regards,

-- 
With best wishes
Dmitry