linux-kernel - [PATCH v3 0/3] i2c: spacemit: add reset support

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Message-Id: <20251230-i2c-reset-v3-0-7500eb93b06e@gmail.com>
Date: Tue, 30 Dec 2025 22:29:01 +0800
From: Encrow Thorne <jyc0019@...il.com>
To: Troy Mitchell <troy.mitchell@...ux.spacemit.com>, 
 Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, Paul Walmsley <pjw@...nel.org>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>
Cc: Troy Mitchell <troymitchell988@...il.com>, 
 Guodong Xu <guodong@...cstar.com>, linux-i2c@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 spacemit@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Encrow Thorne <jyc0019@...il.com>
Subject: [PATCH v3 0/3] i2c: spacemit: add reset support

Add reset support for the K1 I2C driver. A reset ensures that the
controller starts in a clean and known state.

Reset ensures that the I2C hardware is in a clean state. We cannot assume
that no program used I2C before the kernel booted.

Signed-off-by: Encrow Thorne <jyc0019@...il.com>
---
Changes in v3:
- Move reset property in dt-bindings.
- Use devm_reset_control_get_optional_exclusive_deasserted() instead.
- Rebase to v6.19-rc1.
- Link to v2: https://lore.kernel.org/r/20251219-i2c-reset-v2-0-ad201a602e74@gmail.com

Changes in v2:
- Replace reset property in dt-bindings.
- Use devm_reset_control_get_optional_exclusive_deasserted() instead.
- Rebase to v6.19-rc1.
- Link to v1: https://lore.kernel.org/r/20251119-i2c-k1_reset-support-v1-0-0e9e82bf9b65@gmail.com

---
Encrow Thorne (3):
      dt-bindings: i2c: spacemit: add optional resets
      i2c: k1: add reset support
      riscv: dts: spacemit: add reset property

 Documentation/devicetree/bindings/i2c/spacemit,k1-i2c.yaml | 3 +++
 arch/riscv/boot/dts/spacemit/k1.dtsi                       | 8 ++++++++
 drivers/i2c/busses/i2c-k1.c                                | 7 +++++++
 3 files changed, 18 insertions(+)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251218-i2c-reset-a7be139213de

Best regards,
-- 
Encrow Thorne <jyc0019@...il.com>