boards/efm32-based: Model features in Kconfig

[leandrolanzieri]

Contribution description

This models in Kconfig all the features of the efm32-based boards:

• ikea-tradfri
• slstk3401a
• slstk3402a
• sltb001a
• slwstk6000b-slwrb4150a
• slwstk6000b-slwrb4162a
• stk3600
• stk3700

Testing procedure

• Check the symbol organization
• Green CI
• tests/kconfig_features should pass for all boards

Issues/PRs references

Part of #14148

[basilfx]

@leandrolanzieri I guess that there is not much to test, except that it passes CI?

[leandrolanzieri]

@leandrolanzieri I guess that there is not much to test, except that it passes CI?

Yes, that and that the symbol organization makes sense. In this case it was pretty straightforward because the CPUs are nicely organized in families (thanks for that :)

[basilfx]

Should the modules like USEMODULE += silabs_aem also be in there? I do see USEMODULE += boards_common_silabs though.

[leandrolanzieri]

Should the modules like USEMODULE += silabs_aem also be in there? I do see USEMODULE += boards_common_silabs though.

No, this is only to model features. BOARD_COMMON_SILABS is a symbol to provide the common features, it is not related with the module boards_common_silabs.

[basilfx]

That makes sense. Thanks for explaining.

[cgundogan]

I also took a secondary look and the diff seems to be fine. Murdock also passes the tests. ACK

[leandrolanzieri]

Thanks for reviewing!