raulcxw opened a new pull request, #19484:
URL: https://github.com/apache/nuttx/pull/19484
## Summary
Add a board-agnostic GPIO driver for Realtek Ameba chips, exposing pins
through
the NuttX GPIO (ioexpander) upper half at `/dev/gpioN`.
- **`arch/arm/src/common/ameba/ameba_gpio.{c,h}`** — the shared driver,
sitting
directly on the SDK fwlib register layer. The fwlib GPIO API it calls
resolves at link time from the on-chip ROM symbol table, except
`GPIO_INTStatusGet`/`ClearEdge` which are not in ROM and are compiled in
from
the fwlib `ram_common/ameba_gpio.c`. Pin interrupts are dispatched
NuttX-natively: the port's NVIC vector is owned by NuttX via `irq_attach`,
and
the ISR reads/clears status through the fwlib helpers.
- The driver keeps nothing IC-specific: the port count, per-port NVIC vectors
and RCC gate bits come from a per-chip `<ameba_gpio_chip.h>` resolved on
the
include path, so bringing up a new Ameba chip only adds that header, not a
change to the shared driver.
- **`common/ameba/Kconfig`** — a shared "Ameba Peripheral Support" menu with
the
`AMEBA_GPIO` option, sourced by each Ameba chip's Kconfig so it is reused
across ICs (RTL8721Dx, RTL8720F, ...).
- **`arch/arm/src/rtl8721dx`** — provide `ameba_gpio_chip.h`, wire the driver
into **both the make and CMake builds**, and compile the fwlib register
layer
(`ameba_gpio.c`) into `libameba_fwlib` for the RTL8721Dx.
- **`boards/arm/rtl8721dx/pke8721daf`** — board pin table
(`rtl8721dx_gpio.c`),
bring-up registration, and a standalone `gpio` defconfig.
- **`tools/nxstyle`** — whitelist the Ameba `GPIO_` SDK ROM symbol prefix
(alongside the existing `FLASH_`/`IPC_`/... Ameba prefixes) so the vendor
GPIO
API's mixed-case identifiers do not trip nxstyle.
- Documentation: the `gpio` configuration and pin encoding.
## Impact
- New: `AMEBA_GPIO` driver + `pke8721daf:gpio` configuration. Off by
default;
no effect on existing configurations.
- Builds under both make and CMake (the CMake support landed in #19463).
## Testing
Fork CI on top of current apache/master, all green — the `pke8721daf:gpio`
config builds under both build systems, and the existing `nsh` configs for
both
boards still build:
<details>
<summary>pke8721daf:gpio — make and CMake</summary>
```
# make
$ ./tools/configure.sh pke8721daf:gpio && make
-- Found assembler:
~/rtk-toolchain/asdk-10.3.1-4602/linux/newlib/bin/arm-none-eabi-gcc
PACK: wrote nuttx.bin
-rw-r--r-- 1 root root 517728 nuttx.bin
# CMake
$ . tools/ameba/env.sh pke8721daf
$ cmake -B build -DBOARD_CONFIG=pke8721daf:gpio -GNinja && cmake --build
build
[1172/1174] Linking C executable nuttx
PACK: wrote build/nuttx.bin
-rw-r--r-- 1 root root 527456 build/nuttx.bin
```
</details>
Hardware-verified on the pke8721daf (RTL8721Dx) with the make build: the
driver
was exercised on target through `/dev/gpio*` (input read, output write and
pin
interrupts). The CMake build of the same config is CI-verified (above).
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