Hello Stefano, I'm really glad to see this series.
In the list of platform-specific bits you are trying to make selectable, you missed platform support code itself. Moreover, as it is said in your follow-up emails, set of UART, IOMMU, GIC is defined by SoC family. So wouldn't it be more natural to introduce platform configs which would couple specific drivers support? With a special platform i.e. "other" which enables all drivers and platform code.
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