fdcavalcanti opened a new pull request, #19558:
URL: https://github.com/apache/nuttx/pull/19558
## Summary
- drives/ioexpander: add support to PI4IOE IO Expander
Adds support for the PIO4IOE IO Expander, more specifically the
PIO4IOE5V6408 version.
Assisted-by: Cursor IDE agents
Adds a NuttX IO expander driver for the Diodes Incorporated PI4IOE5V6408
8-bit I2C GPIO expander.
- Supports GPIO direction, input/output access, pull-up/pull-down
configuration, high-impedance output mode, buffered state, and optional
multi-pin operations.
- Provides optional interrupt callbacks processed through the high-priority
work queue.
- Implements software reset and restores the device’s documented default
register state.
- Adds Kconfig, Make, and CMake integration, plus the public initialization
API and configuration structure.
- Supports both device addresses, 0x43 and 0x44.
## Impact
- Requires I2C support and board-provided I2C bus configuration.
- Interrupt support is optional; enabling it requires board interrupt hooks
and SCHED_HPWORK.
- Currently only used by `esp32p4-tab5` board
- No expected security, documentation, or backward-compatibility impact.
## AI Disclaimer
Since we do not have AI guidelines yet, I will disclaim its use here.
This addition has been generated by Cursor IDE (mostly Grok 4.5 Agent) using
the PI4IOE5V6408 driver available for
[ESP-IDF](https://components.espressif.com/components/espressif/esp_io_expander_pi4ioe5v6408/versions/1.0.0/dependencies?language=en)
and its datasheet as sources, while using all the other IO Expander drivers as
the NuttX reference.
I have personally reviewed the implementation before submitting.
## Testing
I do not have this IC as an individual part. I tested it as embedded in the
`esp32p4-tab5` board.
Schematics can be found [here](https://docs.m5stack.com/en/core/Tab5) and
this is the part I tested:
<img width="522" height="512" alt="image"
src="https://github.com/user-attachments/assets/d80aa33c-d393-47a9-846f-93779770f58d";
/>
I have used it to enable and disable the LCD_RST line and it is working fine.
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