linux-kernel - [PATCH v5 0/2] Resolve MPM register space situation

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Message-Id: <20230328-topic-msgram_mpm-v5-0-6e06278896b5@linaro.org>
Date:   Wed, 23 Aug 2023 13:15:30 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     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,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v5 0/2] Resolve MPM register space situation

v4 -> v5:
- Pick up tags
- Rebase on Rob's of_ header untanglement

Link to v4: https://lore.kernel.org/r/20230328-topic-msgram_mpm-v4-0-bae382dc0f92@linaro.org

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- remove the outdated example from the cover letter, check bindings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.

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: e3f80d3eae76c3557b3c9b5938ad01c0e6cf25ec
change-id: 20230328-topic-msgram_mpm-c688be3bc294

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@...aro.org>