dcgong2917 opened a new pull request, #19800:
URL: https://github.com/apache/nuttx/pull/19800
## Summary
Adds GPIO, UART and I2C driver support for the RTL8720F (single-core
Cortex-M55 KM4TZ). All three reuse the shared Ameba common drivers
(arch/arm/src/common/ameba) already in tree, supplying only the per-chip
headers and board wiring:
- **GPIO**: single-port (Port A only) controller; board registers an
output/input/interrupt pin trio.
- **UART**: reuses common ameba_uart.c; exposes UART0 as /dev/ttyS1
(LOG-UART owns the console). TERMIOS enabled.
- **I2C**: reuses common ameba_i2c.c; DesignWare polling master, two
controllers exposed as /dev/i2c0 and /dev/i2c1.
Each adds a chip header, board registration table, a minimal defconfig,
and documentation (board index.rst Features + config section).
## Impact
New chip/board support only; no existing code paths changed.
## Testing
- checkpatch/nxstyle: clean across all 3 commits.
- Build: `rtl8720f_evb:i2c` configures and builds clean.
- Hardware (rtl8720f_evb):
- GPIO: output/input, falling-edge interrupt via PA22↔PA24 loopback.
- UART: serialrx/serialblaster over PA22↔PA23 loopback, 2600 bytes OK.
- I2C: clean bus self-test (no slave), then full write/read verified
against an RTL8721F slave (SDK raw_i2c_polling_slave @ 0x23) —
START/addr/ACK/write-offset+data/repeated-START/read/STOP full chain.
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