linux-kernel - [PATCH 0/8] dt-bindings: mfd: syscon: Document more compatibles and require simpe-mfd description

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Message-Id: <20240519-dt-bindings-mfd-syscon-split-v1-0-aaf996e2313a@linaro.org>
Date: Sun, 19 May 2024 20:42:15 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Lars Povlsen <lars.povlsen@...rochip.com>, 
 Steen Hegelund <Steen.Hegelund@...rochip.com>, 
 Daniel Machon <daniel.machon@...rochip.com>, UNGLinuxDriver@...rochip.com, 
 Nishanth Menon <nm@...com>, Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Jiaxun Yang <jiaxun.yang@...goat.com>, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 0/8] dt-bindings: mfd: syscon: Document more compatibles
 and require simpe-mfd description

Hi,

Dependency
==========
Depends on https://lore.kernel.org/r/20240510123018.3902184-1-robh@kernel.org
because it touches the same lines.

Merging
=======
1. Bindings: preferrably everything via MFD tree (file/context dependencies).
2. DTS: via subarch maintainers (no dependencies).

Description/problem
===================
Simple syscon nodes can be documented in common syscon.yaml, however
devices with simple-mfd compatible, thus some children, should have
their own schema listing these children.  Such listing makes the binding
specific, allows better validation (so the incorrect child would not
appear in the simple-mfd node) and actually enforces repeated rule for
simple-mfd devices:

  "simple-mfd" is only for simple devices, where the children do not
  depend on the parent.

Currently the syscon+simple-mfd binding is quite broad and allows
any child or property, thus above rule cannot be enforced.

Solution
========
1. Split the syscon.yaml binding into common syscon properties, used
   potentially by many bindings, and only simple syscon devices (NO
   simple-mfd!).
2. Move some known simple-mfd bindings from syscon.yaml to dedicated
   files.

This patchset might introduce new dtbs_check warnings for devices having
simple-mfd and being part of syscon.yaml previously. I fixed some of
them, but probably not all.

Best regards,
Krzysztof

To: Lee Jones <lee@...nel.org>
To: Rob Herring <robh@...nel.org>
To: Krzysztof Kozlowski <krzk+dt@...nel.org>
To: Conor Dooley <conor+dt@...nel.org>
To: Lars Povlsen <lars.povlsen@...rochip.com>
To: Steen Hegelund <Steen.Hegelund@...rochip.com>
To: Daniel Machon <daniel.machon@...rochip.com>
To: UNGLinuxDriver@...rochip.com
To: Nishanth Menon <nm@...com>
To: Matthias Brugger <matthias.bgg@...il.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-mediatek@...ts.infradead.org

---
Krzysztof Kozlowski (8):
      dt-bindings: mfd: syscon: Drop hwlocks
      dt-bindings: soc: sprd: sc9863a-glbregs: Document SC9863A syscon
      dt-bindings: soc: intel: lgm-syscon: Move to dedicated schema
      dt-bindings: soc: microchip: sparx5-cpu-syscon: Move to dedicated schema
      dt-bindings: soc: ti: am654-serdes-ctrl: Move to dedicated schema
      dt-bindings: mfd: syscon: Split and enforce documenting MFD children
      dt-bindings: mfd: syscon: Add APM poweroff mailbox
      arm64: dts: apm: Add dedicated syscon poweroff compatibles

 .../devicetree/bindings/mfd/syscon-common.yaml     |  72 +++++++
 Documentation/devicetree/bindings/mfd/syscon.yaml  | 222 +++++++++------------
 .../bindings/soc/intel/intel,lgm-syscon.yaml       |  53 +++++
 .../soc/microchip/microchip,sparx5-cpu-syscon.yaml |  49 +++++
 .../bindings/soc/sprd/sprd,sc9863a-glbregs.yaml    |  55 +++++
 .../bindings/soc/ti/ti,am654-serdes-ctrl.yaml      |  42 ++++
 arch/arm64/boot/dts/apm/apm-merlin.dts             |   2 +-
 arch/arm64/boot/dts/apm/apm-mustang.dts            |   2 +-
 8 files changed, 365 insertions(+), 132 deletions(-)
---
base-commit: ca42fd4fd365cbaf798f17f655aee3d8192829f3
change-id: 20240517-dt-bindings-mfd-syscon-split-37e23996523d

Best regards,
-- 
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>