linux-kernel - [PATCH 0/2] pinctrl: spacemit: support I/O power domain configuration

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Message-Id: <20251223-kx-pinctrl-aib-io-pwr-domain-v1-0-5f1090a487c7@linux.spacemit.com>
Date: Tue, 23 Dec 2025 17:11:10 +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 0/2] 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 (2):
      dt-bindings: pinctrl: add syscon property
      pinctrl: spacemit: support I/O power domain configuration

 .../bindings/pinctrl/spacemit,k1-pinctrl.yaml      |  11 ++
 arch/riscv/boot/dts/spacemit/k1.dtsi               |   4 +-
 drivers/pinctrl/spacemit/pinctrl-k1.c              | 131 ++++++++++++++++++++-
 3 files changed, 142 insertions(+), 4 deletions(-)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251223-kx-pinctrl-aib-io-pwr-domain-b02da255f95c
prerequisite-change-id: 20251125-02-k3-pinctrl-738cbddbe49d:v1
prerequisite-patch-id: bfa2def3e13eeaff0bb88e5b3411041d4e2a61ca
prerequisite-patch-id: 3a1590265f1222f1497fb55608a09388df3efdef
prerequisite-patch-id: 26d923faae23d9248bbf650f5f8ceb02479466f4

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