esp32: Consider CPU frequency constraints when Wi-Fi/BT is enabled

Port, board and/or hardware

esp32

MicroPython version

v1.26.1

Reproduction

I’ve tested this myself:

1. Turn on Wi-Fi

2. machine.freq(40_000_000)
   MPY freezes

3. freq(40_000_000) first

4. wlan.active(True)
   MPY freezes

Expected behaviour

Espressif’s docs do say that APB clock must be ≥80 MHz when wireless is on, and APB = CPU freq when it’s under 80 MHz

Observed behaviour

MPY freezes when cpu freq not compatitable with wireless module.

I think it stucks here:
https://github.com/micropython/micropython/blob/27544a2d81da5b0d804a932d98d680f121a22b8f/ports/esp32/modmachine.c#L128-L130

https://github.com/micropython/micropython/blob/27544a2d81da5b0d804a932d98d680f121a22b8f/ports/esp32/network_wlan.c#L291-L294

Additional Information

Would it be possible to add a safeguard in MPY? For example:
If Wi-Fi or BLE is active, set a min allowed freq (raise an exception or warn if user tries to go lower)
When CPU freq already low, don't allow to enable wifi

Some tips from web:

Code of Conduct

Yes, I agree

Start with ports/esp32/modmachine.c around lines 128-130 and ports/esp32/network_wlan.c around lines 291-294, then reproduce the two frequency/Wi-Fi orderings on an ESP32 with MicroPython v1.26.1. Check the Espressif APB-clock constraint and determine the expected safeguard behavior; done means the incompatible configuration no longer freezes MicroPython and the relevant behavior is covered by tests or documented validation.