RE: [RFC PATCH 00/11 V7] MXS: Add i.MX28 USB Host driver

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> Still use IRQF_SHARED for the usb interrupt, but:
> * The IRQ handler in ehci-mxs, that's set in hc_driver.irq would be
> always
> returning IRQ_NONE.
> * The IRQ handler in imx-otg would call the callback registered via
> imx_otg_set_irq_handler() only if the port was actually in host mode
The interrupt which is registered by hcd core is usb_hcd_irq, it will call
ehci_irq. The hc_driver.irq is included in usb_hcd_irq. 

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