linux-kernel - [PATCH v2 0/3] pinctrl: spacemit: support I/O power domain configuration

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Message-Id: <20260108-kx-pinctrl-aib-io-pwr-domain-v2-0-6bcb46146e53@linux.spacemit.com>
Date: Thu, 08 Jan 2026 14:42:37 +0800
From: Troy Mitchell <troy.mitchell@...ux.spacemit.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>, 
 Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
 Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, 
 Linus Walleij <linusw@...nel.org>
Cc: devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 spacemit@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, 
 Troy Mitchell <troy.mitchell@...ux.spacemit.com>
Subject: [PATCH v2 0/3] pinctrl: spacemit: support I/O power domain
 configuration

This series adds support for configuring IO power domain voltage for
dual-voltage GPIO banks on the Spacemit K1 SoC.

On K1, IO domain power control registers determine whether a GPIO bank
operates at 1.8V or 3.3V. These registers default to 3.3V operation,
which may lead to functional failures when GPIO banks are externally
supplied with 1.8V but internally remain configured for 3.3V.

The IO power domain registers are implemented as secure registers and
require an explicit unlock sequence via the AIB Secure Access Register
(ASAR), located in the APBC register space.

This series ensures that pin voltage configuration correctly reflects
hardware requirements.

Signed-off-by: Troy Mitchell <troy.mitchell@...ux.spacemit.com>
---
Troy Mitchell (3):
      dt-bindings: pinctrl: spacemit: add syscon property
      pinctrl: spacemit: support I/O power domain configuration
      riscv: dts: spacemit: modify pinctrl node in dtsi

 .../bindings/pinctrl/spacemit,k1-pinctrl.yaml      |   5 +
 arch/riscv/boot/dts/spacemit/k1.dtsi               |   3 +-
 drivers/pinctrl/spacemit/pinctrl-k1.c              | 129 ++++++++++++++++++++-
 3 files changed, 133 insertions(+), 4 deletions(-)
---
base-commit: 168d19e604855cfa6024e9854f8ea9b1c8efa2d9
change-id: 20251223-kx-pinctrl-aib-io-pwr-domain-b02da255f95c

Best regards,
-- 
Troy Mitchell <troy.mitchell@...ux.spacemit.com>