[PATCH v5 0/4] input: add GPIO-based charlieplex keypad

[Hugo Villeneuve <hugo@hugovil.com>]

From: Hugo Villeneuve <hvilleneuve@dimonoff.com>

Hello,
this patch series add a new GPIO charlieplex keypad driver.

The first two patches simply commonize two properties that are present in
a few bindings, so that the actual patches for the charlieplex keypad driver
can reuse them instead of also redefining them.

I have tested the driver on a custom board with a Solidrun RZ/G2LC SOM
with three charlieplex keyboards, all connected thru a single PCAL6416 I2C GPIO
expander.

Link: [v1] https://lore.kernel.org/all/20260203155023.536103-1-hugo@hugovil.com/
Link: [v2] https://lore.kernel.org/all/20260213171431.2228814-1-hugo@hugovil.com/
Link: [v3] https://lore.kernel.org/all/20260225155409.612478-1-hugo@hugovil.com/
Link: [v4] https://lore.kernel.org/all/20260305192101.2125660-1-hugo@hugovil.com/

Changes for v5:
- Add Reviewed-by tags (Rob)
- Replace GPIO with line in settling-time-us property description (Rob)
- Reorder Makefile entry (Andy)
- Change copyright date to 2026 (Andy)
- Change some signed variables to unsigned (Andy)
- Move some variables declaration within loop (Andy)
- Add proper labels for GPIO pin names (Andy)

Changes for v4:
- Fix indentation in comments (Andy)
- Add missing includes (Andy)
- Remove OF dependency (Andy/Dmitry)
- Uniformize return code variables to "err" (Andy/Dmitry)
- Change signed iterator to unsigned and move within loop (Andy)
- Remove unused platform_set_drvdata() (Andy)
- Fixed typo in cover letter PCAL6416 (Geert)
- Changed name in bindings example (Geert)
- Added pull resistors to bindings doc and example (Geert)

Changes for v3:
- Add ASCII diagram in bindings, and reference to it in example
- Reorder properties alphabetically
- Add patch to define common input settling-time-us property
- Add patch to define common input debounce-delay-ms property

Changes for v2:
- Fix yamllint error for example
- Remove unused debug variable (nkeys)
- Remove support for custom linux,no-autorepeat DT property
- Remove support for custom gpio-activelow DT property

Thank you.

Hugo Villeneuve (4):
  dt-bindings: input: add debounce-delay-ms common property
  dt-bindings: input: add settling-time-us common property
  dt-bindings: input: add GPIO charlieplex keypad
  Input: charlieplex_keypad: add GPIO charlieplex keypad

 .../bindings/auxdisplay/holtek,ht16k33.yaml   |   5 +-
 .../bindings/input/cirrus,ep9307-keypad.yaml  |   7 +-
 .../input/gpio-charlieplex-keypad.yaml        | 108 +++++++++
 .../bindings/input/gpio-matrix-keypad.yaml    |   5 +-
 .../devicetree/bindings/input/input.yaml      |  16 ++
 .../input/mediatek,mt6779-keypad.yaml         |   1 +
 .../devicetree/bindings/mfd/fsl,mc13xxx.yaml  |   2 -
 MAINTAINERS                                   |   7 +
 drivers/input/keyboard/Kconfig                |  14 ++
 drivers/input/keyboard/Makefile               |   1 +
 drivers/input/keyboard/charlieplex_keypad.c   | 223 ++++++++++++++++++
 11 files changed, 377 insertions(+), 12 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/input/gpio-charlieplex-keypad.yaml
 create mode 100644 drivers/input/keyboard/charlieplex_keypad.c


base-commit: 6d4b67a2a76a4ff2393fe88119ae4332821b82b4
-- 
2.47.3