[PATCH v4 0/3] i2c: ma35d1: Add support for MA35D1 I2C controller

[Zi-Yu Chen <zychennvt@gmail.com>]

This series adds support for the I2C controller found in the Nuvoton
MA35D1 SoC. The driver supports controller and optional target mode
and runtime power management.

The implementation has been tested on the Nuvoton MA35D1 SOM board.

Changes in v4:
  - Patch 1 (dt-bindings):
    - Update example interrupt number.
  - Patch 2 (driver):
    - Remove redundant spinlocks and fix 'irq' type to signed.
    - Fix target address recovery in ma35d1_i2c_reset().
    - Refactor IRQ handler for multi-msg reads and NACK/IGNORE_NAK.
    - Fix timeout UAF via explicit IRQ disabling during recovery.
    - Drop IRQF_SHARED and fix PM paths in probe/unregistration.
    - Limit suspend/resume wakeup logic to target mode only.
  - Patch 3 (dts):
    - Add missing i2c0 node to dtsi.
    - Switch SoM configuration from i2c1 to i2c2 with updated pinctrl.
    - Add nau8822 audio codec node under i2c2 on the SoM board.
    - Drop redundant i2c0 alias and clean up dtsi property ordering.
  v3: https://lore.kernel.org/r/20260512073953.564323-1-zychennvt@gmail.com/

Changes in v3:
  - Fix minor DTS formatting issues (whitespace, missing newline)  
  v2: https://lore.kernel.org/r/20260316063726.41048-1-zychennvt@gmail.com

Changes in v2:
  - Overall:
    - Rebase on linux-i2c/i2c-next
    - Switched terminology from "master/slave" to "controller/target".  
  - Patch 1 (dt-bindings):
    - Simplified description and fixed 'reg' size in example.
  - Patch 2 (driver):
    - Modernized using devm_*, generic device properties, and FIELD_PREP/GENMASK.
    - Optimized power management by moving clock control to runtime PM.
    - Simplified code by removing redundant .remove(), .owner, and inlines.
    - Added dev_err_probe() and default bus frequency handling.
  - Patch 3 (dts):
    - Moved i2c aliases to board dts and reordered nodes alphabetically.
  v1: https://lore.kernel.org/r/20260302020822.13936-1-zychennvt@gmail.com

Zi-Yu Chen (3):
  dt-bindings: i2c: nuvoton,ma35d1-i2c: Add MA35D1 I2C controller
  i2c: ma35d1: Add Nuvoton MA35D1 I2C driver support
  arm64: dts: nuvoton: Add I2C nodes for MA35D1 SoC

 .../bindings/i2c/nuvoton,ma35d1-i2c.yaml      |  63 ++
 .../boot/dts/nuvoton/ma35d1-som-256m.dts      |  20 +
 arch/arm64/boot/dts/nuvoton/ma35d1.dtsi       |  72 ++
 drivers/i2c/busses/Kconfig                    |  13 +
 drivers/i2c/busses/Makefile                   |   1 +
 drivers/i2c/busses/i2c-ma35d1.c               | 778 ++++++++++++++++++
 6 files changed, 947 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/nuvoton,ma35d1-i2c.yaml
 create mode 100644 drivers/i2c/busses/i2c-ma35d1.c

-- 
2.34.1