Question about EHCI PCI/platform drivers

Hello,

I'm working on EHCI HC glue port for Marvell Orion SoC. The Orion has
a PCI/PCIE interfaces as well as an integrated USB controller.

While looking at ehci-hcd.c it looks like there's some kind of dependency
between PCI_DRIVER and PLATFORM_DRIVER. I saw some previous threads
about the ehci-fsl.c regarding this issue, but I'm sure I understand,
for example, why in module_init if pci_register_driver fails the platform
driver is unregistered? Shouldn't these two types of drivers be independent?

Thanks,
Tzachi

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