On 08/17/2013 05:17 AM, Thierry Reding wrote: ... > Well, the most obvious cases where early initialization is needed > are interrupt controllers and clocks. ... and IOMMUs, which apparently need to initialize before any devices whose transactions are routed through the IOMMU, in order to set themselves up as the IOMMU for the relevant devices. It's possible that the CPU-visible bus structure isn't a strict inverse/reverse of the device-visible bus-structure. A device may have CPU-visible registers on one bus segment, but inject master transactions onto an unrelated bus segment. So it may not be as simple as making a bus driver for the bus segment affected by the IOMMU, and having that driver trigger instantiation of all its children. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
