linux-kernel - [PATCH v4 00/12] pinctrl: stm32: Support I/O synchronization

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Message-ID: <20251023132700.1199871-1-antonio.borneo@foss.st.com>
Date: Thu, 23 Oct 2025 15:26:48 +0200
From: Antonio Borneo <antonio.borneo@...s.st.com>
To: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Bartosz Golaszewski <brgl@...ev.pl>, <linux-gpio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
CC: Antonio Borneo <antonio.borneo@...s.st.com>,
        Christophe Roullier
	<christophe.roullier@...s.st.com>,
        Fabien Dessenne
	<fabien.dessenne@...s.st.com>,
        Valentin Caron <valentin.caron@...s.st.com>
Subject: [PATCH v4 00/12] pinctrl: stm32: Support I/O synchronization

This v4 is a subset of the v1, split-out to simplify the review.
The old patches concerned in v1 where 05/14, 06/14 and 07/14.

This subset:
- introduces the generic pinctrl properties "skew-delay-input-ps" and
  "skew-delay-output-ps";
- introduces the support for matching strings as argument for generic
  pinctrl properties;
- applies some cleanup to STM32 pinctrl driver to simplify the following
  commits in the series;
- adds support for the I/O synchronization in STM32 pinctrl driver and
  bindings;
- updates the DT for STM32MP25 pinctrl to use the new properties.

Changes v3 -> v4:
- Add time prefix '-ps' to the new properties "skew-delay-input-ps" and
  "skew-delay-output-ps";
- Add support for matching strings as argument for generic pinctrl
  properties;
- Replace the numeric values of "st,io-sync" properties with strings;
- Fix minor typos in pinconf code;
- Link to v3: https://lore.kernel.org/lkml/20251014140451.1009969-1-antonio.borneo@foss.st.com/

Changes v2 -> v3:
- rebased on v6.18-rc1;
- replace "skew-delay-direction" with "skew-delay-input" and
  "skew-delay-output";
- use generic properties from pincfg-node.yaml in dt-bindings;
- add the new properties to the new node eth1 in DT;
- Link to v2: https://lore.kernel.org/lkml/20250905135547.934729-1-antonio.borneo@foss.st.com/

Changes v1 -> v2 subset:
- rebased on v6.17-rc1;
- replace ST property "st,io-delay" with generic "skew-delay";
- replace ST property "st,io-delay-path" with generic "skew-delay-direction";
- collapse the other ST property in a single "st,io-sync";
- Link to v1: https://lore.kernel.org/lkml/20241022155658.1647350-1-antonio.borneo@foss.st.com/



Antonio Borneo (12):
  pinctrl: pinconf-generic: Fix minor typos in comments
  pinctrl: pinconf-generic: Handle string values for generic properties
  pinctrl: pinconf-generic: Add properties 'skew-delay-{in,out}put-ps'
  dt-bindings: pincfg-node: Add properties 'skew-delay-{in,out}put-ps'
  pinctrl: stm32: Rework stm32_pconf_parse_conf()
  pinctrl: stm32: Simplify handling of backup pin status
  pinctrl: stm32: Drop useless spinlock save and restore
  pinctrl: stm32: Avoid keeping a bool value in a u32 variable
  pinctrl: stm32: Support I/O synchronization parameters
  dt-bindings: pinctrl: stm32: Use properties from pincfg-node.yaml
  dt-bindings: pinctrl: stm32: Support I/O synchronization parameters
  arm64: dts: st: Add I/O sync to eth pinctrl in stm32mp25-pinctrl.dtsi

 .../bindings/pinctrl/pincfg-node.yaml         |  17 +
 .../bindings/pinctrl/st,stm32-pinctrl.yaml    | 101 ++++-
 arch/arm64/boot/dts/st/stm32mp25-pinctrl.dtsi |   4 +
 drivers/pinctrl/pinconf-generic.c             |  65 +++-
 drivers/pinctrl/stm32/pinctrl-stm32.c         | 359 ++++++++++++++----
 drivers/pinctrl/stm32/pinctrl-stm32.h         |   1 +
 drivers/pinctrl/stm32/pinctrl-stm32mp257.c    |   2 +
 include/linux/pinctrl/pinconf-generic.h       |  19 +-
 8 files changed, 455 insertions(+), 113 deletions(-)


base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
-- 
2.34.1