feat: enable Portenta H7 ethernet

[razvanphp]

Note sure if anything else is needed, or if you guys want to do the same for Giga H7.

Closes #112.

[CLAassistant]

All committers have signed the CLA.

[razvanphp]

@iabdalkader or @pillo79 can you please look into this? We really need the ethernet connection for our project and wanted to test the beta. Thank you!

[iabdalkader]

can you please look into this? We really need the ethernet connection for our project and wanted to test the beta. Thank you!

Which sample to test with? Any specific config?

[razvanphp]

any arduino sample, like blinky, but we need it to get a valid IP address and respond to ping. Would be nice to port a PWM sample...

I also tried the vanilla zephyr blinky_pwm sample on portenta H7 and it does not work, it needs additional devicetree wiring.

[iabdalkader]

any arduino sample, like blinky, but we need it to get a valid IP address and respond to ping. Would be nice to port a PWM sample...
I also tried the vanilla zephyr blinky_pwm sample on portenta H7 and it does not work, it needs additional devicetree wiring.

I don't follow. I thought this PR enabled Ethernet and you just wanted someone to test it and merge it?

[razvanphp]

Yes, on vanilla zephyr ethernet for portenta works because if has what is contained in this PR, so please check it with any arduino sample + ethernet shield and merge it if you can ping the board. Thanks!

[razvanphp]

Sorry, I’ve been working on PWM and mixed the topics 🙂

[iabdalkader]

This has already been applied to the board upstream and in the branch we use:

https://github.com/zephyrproject-rtos/zephyr/blob/main/boards/arduino/portenta_h7/arduino_portenta_h7-common.dtsi#L216

https://github.com/arduino/zephyr/blob/zephyr-arduino-20250529/boards/arduino/portenta_h7/arduino_portenta_h7-common.dtsi#L216

I don't think this is needed anymore.