linux-kernel - [PATCH v7 0/6] spmi: pmic-arb: Add support for multiple buses

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Message-Id: <20240329-spmi-multi-master-support-v7-0-7b902824246c@linaro.org>
Date: Fri, 29 Mar 2024 20:54:17 +0200
From: Abel Vesa <abel.vesa@...aro.org>
To: Stephen Boyd <sboyd@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Srini Kandagatla <srinivas.kandagatla@...aro.org>, 
 Johan Hovold <johan@...nel.org>, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, 
 linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org, 
 Abel Vesa <abel.vesa@...aro.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v7 0/6] spmi: pmic-arb: Add support for multiple buses

This RFC prepares for and adds support for 2 buses, which is supported
in HW starting with version 7. Until now, none of the currently
supported platforms in upstream have used the second bus. The X1E80100
platform, on the other hand, needs the second bus for the USB2.0 to work
as there are 3 SMB2360 PMICs which provide eUSB2 repeaters and they are
all found on the second bus.

Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
Changes in v7:
- This time really collected Krzysztof's R-b tags
- Added Neil's R-b tag to the 4th patch
- Split the multi bus patch into two separate patches, one for adding
  the bus object and one for the secondary bus, as per Neil's suggestion
- Fixed regression for single bus platforms triggered by casting to
  pmic_arb instead of bus in pmic_arb_non_data_cmd_v1
- Fixed bus object allocation by using ctrl drvdata instead
- Prefixed the spmi node property in x1e80100 schema with '^'
- Fixed struct and function documentation warnings reported by Neil

Changes in v6 (resend):
- Collected Krzysztof's R-b tags
- Link to v6: https://lore.kernel.org/r/20240222-spmi-multi-master-support-v6-0-bc34ea9561da@linaro.org

Changes in v6:
- Changed the compatible to platform specific (X1E80100) along with the
  schema. Fixed the spmi buses unit addresses and added the empty ranges
  property. Added missing properties to the spmi buses and the
  "unevaluatedProperties: false".
- Deprecated the "qcom,bus-id" in the legacy schema.
- Changed the driver to check for legacy compatible first
- Link to v5: https://lore.kernel.org/r/20240221-spmi-multi-master-support-v5-0-3255ca413a0b@linaro.org

Changes in v5:
- Dropped the RFC as there aren't any concerns about the approach anymore
- Dropped the unused dev and res variables from pmic_arb_get_obsrvr_chnls_v2
- Link to v4: https://lore.kernel.org/r/20240220-spmi-multi-master-support-v4-0-dc813c878ba8@linaro.org

Changes in v4:
- Fixed comment above pmic_arb_init_apid_v7 by dropping the extra "bus" word
- Swicthed to devm_platform_ioremap_resource_byname for obsrvr and chnls.
  The core remains with platform_get_resource_byname as we need the core size.
- Dropped comment from probe related to the need of platform_get_resource_byname
  as it not true anymore.
- Dropped the qcom,bus-id optional property.
- Link to v3: https://lore.kernel.org/r/20240214-spmi-multi-master-support-v3-0-0bae0ef04faf@linaro.org

Changes in v3:
- Split the change into 3 separate patches. First 2 patches are moving
  apid init and core resources into version specific ops. Third one is
  adding the support for 2 buses and dedicated compatible.
- Added separate bindings patch
- Link to v2: https://lore.kernel.org/r/20240213-spmi-multi-master-support-v2-1-b3b102326906@linaro.org

Changes in v2:
- Reworked it so that it registers a spmi controller for each bus
  rather than relying on the generic framework to pass on the bus
  (master) id.
- Link to v1: https://lore.kernel.org/r/20240207-spmi-multi-master-support-v1-0-ce57f301c7fd@linaro.org

---
Abel Vesa (6):
      dt-bindings: spmi: Add X1E80100 SPMI PMIC ARB schema
      dt-bindings: spmi: Deprecate qcom,bus-id
      spmi: pmic-arb: Make the APID init a version operation
      spmi: pmic-arb: Make core resources acquiring a version operation
      spmi: pmic-arb: Register controller for bus instead of arbiter
      spmi: pmic-arb: Add multi bus support

 .../bindings/spmi/qcom,spmi-pmic-arb.yaml          |   1 +
 .../bindings/spmi/qcom,x1e80100-spmi-pmic-arb.yaml | 136 +++
 drivers/spmi/spmi-pmic-arb.c                       | 953 +++++++++++++--------
 3 files changed, 723 insertions(+), 367 deletions(-)
---
base-commit: a6bd6c9333397f5a0e2667d4d82fef8c970108f2
change-id: 20240207-spmi-multi-master-support-832a704b779b

Best regards,
-- 
Abel Vesa <abel.vesa@...aro.org>