[PATCH v4 0/2] serial: 8250: Add AN7581 UART support

[Christian Marangi <ansuelsmth@gmail.com>]

This is a new version of [1] to support UART driver for
Airoha SoC.

One additional function was needed serial8250_get_baud_rate()
for the driver to work correctly for baud rate calculation.

While at it also try to clarify a long standing issue with
new UART driver when adding new ids for uart_config[].

[1] https://lore.kernel.org/all/20250209210241.2622309-1-benjamin.larsson@genexis.eu/

Changes v4:
- Add Review tag
- Add errno and types header
- Drop redundant () from comment
- Use define for get_divisor

Changes v3:
- Address review from ai bot
- Add all missing kernel headers
- Improve divisor calculation
- Fix wrong uart config table
- Simplify divisor table handling

Changes v2:
- Drop intermediate patch
- Use .set_divisor OPs
- Use div_u64 instead of / 40 for 32 bit overflow
- Drop dedicated match table and use compatible for type

Changes compared to [1]:
- Fix all formal error
- Use better compatible names
- Drop unneeded header
- Drop usage of irq (it's filled by the generic function)
- General code cleanup and reorg
- Split to patch and add the UAPI map patch

Benjamin Larsson (1):
  dt-bindings: serial: 8250: Add Airoha compatibles

Christian Marangi (1):
  serial: 8250: Add Airoha SoC UART and HSUART support

 .../devicetree/bindings/serial/8250.yaml      |   5 +
 drivers/tty/serial/8250/8250.h                |   6 +
 drivers/tty/serial/8250/8250_airoha.c         | 187 ++++++++++++++++++
 drivers/tty/serial/8250/8250_port.c           |  16 ++
 drivers/tty/serial/8250/Kconfig               |  11 ++
 drivers/tty/serial/8250/Makefile              |   1 +
 6 files changed, 226 insertions(+)
 create mode 100644 drivers/tty/serial/8250/8250_airoha.c

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2.53.0